An A1 certificate does one important job: it documents which country’s social-security legislation applies when a person works across borders. It does not determine where salary is taxed, whether a foreign company has a permanent establishment, whether RUT applies or whether the employee has permission to work in Denmark.
That separation matters. A posted employee can remain socially insured in the home country while owing Danish income tax and being covered by Danish posted-worker conditions. A foreign company can have no Danish permanent establishment and still need Danish social-security registration for an employee working permanently from Denmark. One answer cannot be copied into every workstream.
Official guidance checked: 16 October 2026.
Start with the work pattern
- Permanent work in Denmark normally points to Danish coverage, even with a foreign employer.
- A qualifying temporary posting can preserve sending-country coverage for up to 24 months.
- Regular work in several countries requires a residence-country and work-percentage assessment.
- Obtain the competent institution’s decision, then align payroll, healthcare documents and assignment records.
- Assess tax, RUT and right to work separately. An A1 does not resolve those obligations.
What social-security coverage means
Being covered by a country’s social-security legislation determines which system governs contributions and access to covered benefits. Udbetaling Danmark’s guidance lists Danish social-security areas including:
- health insurance;
- sickness and maternity/paternity benefits;
- unemployment insurance;
- industrial-injury insurance;
- state and disability pensions;
- ATP Livslang Pension;
- early-retirement benefits; and
- child and youth benefits.
EU rules coordinate national systems; they do not create one identical European contribution rate or benefit package. Once the applicable country is established, that country’s national rules determine contributions and entitlement, subject to the coordination rules.
One country at a time
For EU/EEA and Swiss cross-border situations, a person is normally subject to one country’s social-security legislation at a time. The employee and employer cannot choose the least expensive system by contract. Nor can payroll simply split coverage between countries because the employee divides the week between them.
The institution’s decision should drive payroll registrations, contribution deductions and healthcare documentation. Where authorities are still coordinating, obtain advice on provisional treatment rather than making duplicate or zero payments without a documented basis.
What an A1 certificate proves
Portable Document A1 identifies the social-security legislation that applies to the person for the activity and period described. For example, an A1 issued by the German institution for a qualifying temporary posting to Denmark documents that German—not Danish—social-security legislation continues to apply during that posting.
The document should be checked against:
- employee’s full name and identifier;
- employer named on the document;
- applicable country of legislation;
- work country or countries;
- legal basis, where shown;
- start and end dates; and
- any limitation or special decision accompanying it.
An A1 for a different employer, country, activity or expired period is not reliable evidence for the current assignment.
What an A1 certificate does not prove
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The practical rule is simple: use A1 only for the social-security conclusion it records.
Which situation are you dealing with?
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Situation 1: permanent work in Denmark
The default EU principle is that a person is covered where work is physically performed. An employee recruited to work continuously from a Danish home office or customer site is not transformed into a posted worker merely because the employer is incorporated abroad.
Indicators of an ordinary Danish work pattern include:
- the person was hired specifically to work in Denmark;
- there is no established job in the sending country to which the employee will return;
- the arrangement is open-ended or intended to be permanent;
- the employee’s normal workplace is Denmark;
- the role develops the Danish market continuously; and
- the employer cannot document a temporary assignment meeting posting conditions.
When Danish social security applies, the foreign employer should map Danish employer registration, ATP, AES, occupational-injury insurance and other contributions. This conclusion can arise even if the employer has no Danish subsidiary and even if a separate tax analysis concludes that the foreign company has no Danish permanent establishment.
Permanent local hire example
A Dutch company hires a sales manager who already lives in Copenhagen. The employee works from Denmark except for occasional meetings in the Netherlands. The arrangement is indefinite and the employee was not transferred from an existing Dutch role for a time-limited service.
Likely direction: Danish social security, subject to a multi-state review if the foreign work becomes regular and predictable. The employer should not request a posting A1 merely to preserve Dutch contribution rates.
Situation 2: qualifying temporary posting to Denmark
EU coordination permits an exception for a genuine temporary posting. A worker sent by an employer to another EU/EEA country or Switzerland can normally remain in the sending country’s system for up to 24 months when the applicable conditions are met.
The authority will consider facts including:
- the expected assignment does not exceed 24 months under the ordinary posting rule;
- the employee is not sent to replace another posted worker;
- the employment relationship with the sending employer continues;
- the worker was attached to the sending country’s system immediately before posting;
- the employer normally carries out genuine and substantial activity in the sending country rather than operating as a letterbox entity; and
- the assignment is genuinely temporary.
The competent institution assesses the complete facts. A contract label, project end date or group secondment letter is evidence, not the decision.
Direct employment relationship
During the posting, the sending employer should continue to retain the core employment relationship. Relevant facts can include who recruits, pays, directs, disciplines and can terminate the worker. Intra-group recharges or day-to-day instructions at a Danish site do not automatically decide the outcome, but they must be disclosed accurately.
No replacement posting
The ordinary rule is not designed to keep one position continuously under sending-country coverage through a series of replacement workers. Check earlier workers on the same role or project, not only the proposed employee’s own assignment length.
24 months is not a guaranteed entitlement
Twenty-four months is the ordinary maximum for a qualifying posting, not an automatic allowance for every cross-border assignment. If the facts fail the posting test, work-country coverage can apply from the start.
Extension beyond 24 months
EU rules allow competent institutions to agree an exception in the person’s interest. Current Danish guidance describes a special individual agreement that may retain Danish coverage for an outgoing assignment of more than two years but no longer than three years. It requires agreement between Udbetaling Danmark and the other country and is not automatic. Other sending countries may apply their own procedure and policy under the coordination rules.
An extension is not guaranteed. Resolve coverage for the additional period before relying on it in payroll. The EU–UK Trade and Cooperation Agreement route has a maximum posting period of 24 months; the Danish guidance states that this cannot be extended under that route.
Temporary posting example
A Polish engineering company sends an engineer who normally works in Poland to install equipment in Denmark for eight months. The Polish company remains the employer, conducts substantive operations in Poland and the worker will return to the Polish role. No replacement arrangement exists.
Likely direction: apply to the Polish institution for A1 before the Danish work begins. Separately assess RUT, Danish working conditions, tax, VAT, permanent establishment and right to work.
Situation 3: regular work in two or more countries
Multi-state work is not the same as a sequence of separate postings. It involves a normal, predictable pattern of work in at least two countries—for example weekly travel, recurring customer visits, international transport or regular cross-border remote work.
The 25% residence-country threshold
If an employee performs a substantial part of their activity in the country of residence, that country’s legislation generally applies. EU guidance uses at least 25% of working time and/or remuneration as the indicator, assessed with the overall situation and expected pattern over the following 12 months.
When less than 25% is performed in the residence country, employer location and the number and countries of employers become decisive. Examples include:
- one employer: coverage normally follows the employer’s registered office/place of business;
- several employers in different countries: residence-country coverage can apply; and
- combined employed and self-employed activity in different countries: the employed-activity country generally controls under EU rules.
These are routing rules, not a do-it-yourself election. Notify the institution in the employee’s residence country. That institution makes a provisional determination and coordinates with other relevant institutions.
Twelve-month forecast and actual monitoring
The 25% analysis is forward-looking but must reflect reality. Prepare a reasonable 12-month forecast of:
- contracted working days;
- home-working days;
- office and customer-site days by country;
- business travel;
- leave and absence treatment;
- remuneration by activity where relevant; and
- expected employer changes.
Track actual days or hours against the forecast. A material shift may require a new decision and payroll change.
Multi-state example
An employee lives in Germany and works for one Danish employer. They work three days a week in Denmark and two days from home in Germany.
Forty percent of work is performed in the residence country, which is above 25%. Under the general multi-state rule, German social-security legislation would normally apply. The employee or employer should notify the German institution and obtain the decision/A1. Danish payroll tax may still apply to Danish workdays under separate rules.
Cross-border remote work and the Øresund Region
Remote-work policies can change social-security coverage even when the employment contract and salary remain unchanged.
Current Danish guidance states that, under the general approach, working from home in the residence country at least 25% of the time can move coverage to that country. One home-working day a week may remain below 25%, depending on the actual percentage. Two or more days a week commonly exceeds it.
Denmark–Sweden Øresund agreement
Denmark and Sweden have a special route for certain employees who:
- live in Sweden;
- work in Denmark for one Danish employer; and
- perform at least 25% but less than 50% of their working time from Sweden for that Danish employer.
The employee and employer must apply for the Øresund social-security agreement; it is not automatic.
If less than 25% is worked in Sweden, the employee should contact Försäkringskassan, which decides coverage under the ordinary multi-state rules. Where the employee does not fit the Øresund criteria, use the general rules or another available Article 16 route rather than assuming the Danish system continues.
Broader European telework agreement
A multilateral framework agreement allows certain employees between participating states to request employer-country coverage where residence-country cross-border telework is at least 25% but less than 50%. Participation is country-specific and changes over time. Denmark was not listed as a participating state on the official depositary’s list checked on 16 October 2026. Do not apply the framework to a Denmark arrangement unless the current official signatory list and the competent institutions confirm eligibility. The specific Denmark–Sweden Øresund process may still be relevant.
Frontier workers: live in one country and work in Denmark
An employee who lives in another European country, works in Denmark and returns home daily or at least weekly is generally a frontier worker. EU guidance states that the work country is responsible for social-security coverage, subject to special healthcare and unemployment rules.
If the employee works only in Denmark, Danish coverage will commonly apply. If the employee also works from home or performs duties in other countries, switch to the multi-state analysis.
An employee living abroad but insured in Denmark may need the Danish special health-insurance card or other documentation. An employer can apply for the special card on the employee’s behalf with a signed power of attorney and required employment and identity details.
Self-employed people working temporarily in Denmark
A self-employed person can post themselves temporarily while remaining in the home system if the applicable conditions are met. Current Danish guidance for outgoing self-employment identifies conditions including:
- expected duration no longer than 24 months under the ordinary rule;
- substantial business activity in the home country;
- a prior period of genuine self-employment;
- similar activity during the assignment; and
- maintaining the infrastructure needed to resume the home-country business after the assignment.
For Danish outgoing self-employment, Life in Denmark currently states at least two months of running the business before posting and looks at factors such as office, tax, professional authorisation and VAT registration.
For an inbound self-employed person, the home-country authority decides whether to issue A1. Denmark separately assesses whether the person is genuinely self-employed for RUT, tax, labour-law and other purposes. An A1 does not prevent reclassification in an unrelated legal area.
United Kingdom cases
The UK left the EU, but social-security coordination continues under two possible legal frameworks:
- the Withdrawal Agreement for people within its protected scope; and
- the EU–UK Trade and Cooperation Agreement protocol for other covered situations.
European Commission guidance warns that the protocol is similar to, but not identical with, the EU coordination regulations. Current Danish social-security guidance includes the United Kingdom in its cross-border work application information.
Do not describe a UK case simply as “non-EU” or automatically apply a bilateral-convention checklist. Identify which framework covers the employee, obtain the appropriate certificate from the UK or Danish authority and verify the exact benefits and contribution branches included.
Work outside the EU coordination rules
Denmark has bilateral social-security agreements with a number of countries and Quebec. These agreements differ and may cover narrower branches, such as pensions and ATP, than EU coordination. They do not all provide an EU A1. Check the relevant agreement and obtain its certificate of coverage or decision from the competent institution.
Where no relevant agreement applies, national rules can operate independently. This can create dual contributions, gaps in benefits and separate employer and employee registrations. There may be no single document resolving every branch. Contact the relevant institutions before finalising the assignment.
Who applies and where?
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Do not send an inbound German or Polish posting application to Udbetaling Danmark merely because the host workplace is in Denmark. The sending-state institution issues the A1 if its legislation continues to apply.
Danish outgoing A1 application: what to prepare
The official employer application page requests or may request:
- appropriate MitID business access for the applicant;
- employee CPR number;
- employment start date;
- employee’s most recent job if employment has lasted less than three months;
- employer CVR number;
- previous work abroad, including employers and countries;
- employment contract;
- posting contract;
- description and evidence of the Danish company’s activities; and
- information about accompanying family members where relevant.
For a complete case file, also prepare:
- assignment letter with exact dates, country and worksite;
- customer/service contract or intra-group assignment evidence;
- role and activities before, during and after posting;
- payroll and reporting line;
- proof that the Danish business performs genuine activity;
- earlier postings to the same role or project;
- expected country split for multi-state work;
- residence evidence; and
- explanation of any change from a previous application.
Avoid attachments that contradict the form—for example a “temporary” assignment letter paired with an indefinite relocation policy.
Application timing and pending decisions
Apply before the assignment where possible. Official Danish pages checked on 16 October 2026 gave different indicative times for an ordinary one-country posting: five weeks on Life in Denmark and three weeks in the Business in Denmark guide. Both showed three weeks for multi-country work and 24 weeks for special agreements.
These are planning estimates, not a guaranteed decision date. Check the current case-specific guidance when applying, submit complete information and allow extra time for cooperation between institutions.
While the application is pending
An application receipt is not the same as an issued A1. Before allowing work to begin:
- confirm whether the host site or customer requires the issued certificate for access;
- obtain advice on provisional contribution treatment;
- retain the application confirmation and complete evidence pack;
- ensure RUT, immigration and working-condition obligations are not delayed;
- agree who will correct payroll if the final decision differs from the expected result; and
- communicate uncertainty accurately to the worker and customer.
Some authorities or sites may impose fines or refuse site access when required evidence is missing. Danish outgoing guidance explicitly warns of those risks abroad. Do not state that a pending application always protects the employer.
A1, EHIC and S1 compared
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Life in Denmark states that a worker posted to Denmark may need a valid EHIC and A1 for temporary healthcare. If the person moves residence to Denmark during the posting, an S1 or S072 may need validation by Udbetaling Danmark so the person can receive a Danish health-insurance card.
Do not tell an employee that A1 alone guarantees every healthcare registration or family benefit. Coordinate the relevant benefit documentation with International Health Insurance.
Danish obligations that may remain despite A1
An inbound A1 can keep the employee in the sending country’s social-security system. The foreign company may still need to address:
- RUT registration and updates;
- Danish posted-worker employment conditions;
- working-environment and health-and-safety rules;
- Danish income tax and hiring-out-of-labour rules;
- employer or payroll reporting where applicable;
- VAT registration and invoicing;
- permanent-establishment exposure;
- SIRI residence or work-permit requirements;
- regulated-profession or construction qualifications;
- customer evidence and site-access rules; and
- accident reporting and cross-border insurance coordination.
Place the A1 decision inside a broader mobilisation checklist. For site-based assignments, the construction-project setup guide connects the separate registration and project-document requirements.
When Danish social security applies
If the employee is covered by Denmark, the employer must implement the relevant Danish obligations. These can include:
- ATP Livslang Pension when age and hours criteria are met;
- AES occupational-disease contribution;
- private workplace-accident insurance;
- AUB, financing contributions and maternity equalisation contributions;
- sickness and parental-leave administration; and
- health-insurance and benefit registration for the employee.
Determine coverage and arrange the relevant insurance before work starts, then complete the applicable employer and payroll registrations in time for the first pay run. The contribution rules and deadlines require their own check.
A1 and Danish AM-bidrag
The Danish labour-market contribution is called AM-bidrag, but it is administered as part of the Danish income-tax system. An A1 decides social-security affiliation; it does not by itself determine whether AM-bidrag or Danish salary tax is due.
The Danish Tax Agency describes AM-bidrag as a tax. Do not switch it off simply because an A1 establishes coverage abroad.
Send the A1 to the relevant Danish tax adviser or payroll owner, but require a separate written tax conclusion before changing A-tax or AM-bidrag treatment.
Change and expiry controls
Review the social-security decision when any of these events occur:
- assignment is extended;
- employee changes legal employer;
- direct employment relationship changes;
- project, country or worksite changes;
- employee replaces another posted worker;
- employee moves residence;
- home-working percentage changes materially;
- employee starts a second job;
- employee begins self-employed activity;
- assignment becomes open-ended;
- employer’s sending-country activity reduces substantially;
- A1 expires or is withdrawn; or
- employee stops work earlier than planned.
A1 evidence register
Maintain these fields for every cross-border worker:
- employee name and internal ID;
- nationality and residence country;
- legal employer;
- application country and authority;
- application date and receipt;
- legal scenario: posting, multi-state, special agreement or convention;
- work countries;
- coverage country;
- certificate number;
- start and end dates;
- RUT registration reference;
- work-permit/residence reference;
- payroll treatment;
- customer/site evidence delivered;
- renewal review date; and
- case owner.
Set the renewal review months before expiry, not on the final day.
Employer implementation checklist
Before contracting or assignment approval
- Identify legal employer, employee residence and physical work countries.
- Decide whether the pattern is permanent local work, posting or regular multi-state work.
- Map earlier and replacement postings.
- Forecast country percentages for the next 12 months.
- Check nationality and whether EU/EEA/Swiss, UK or convention rules apply.
- Confirm the competent institution and application route.
- Assess tax, PE, RUT, VAT and immigration separately.
Before work starts
- Submit the A1 or coverage application early.
- Obtain the issued certificate where required for site access.
- Check employer, countries and dates on the document.
- Complete RUT where applicable.
- Verify right to work and residence formalities.
- Obtain EHIC/S1 or other healthcare documentation as relevant.
- Configure the correct country’s payroll and contributions.
- Arrange insurance and accident reporting.
- Store evidence securely and give the site only what is necessary.
During the assignment
- Track actual workdays by country.
- Track changes in employer, role, residence and project.
- Monitor A1 expiry and special-agreement progress.
- Keep RUT workforce and dates current.
- Reconcile payroll contributions to the coverage decision.
- Investigate employee or authority correspondence promptly.
At extension or close
- Resolve coverage for any period beyond the certificate and agree provisional treatment with the relevant institution if a decision is pending.
- Apply for any special agreement far in advance.
- Report early termination or material changes where required.
- Close or change Danish employer duties only after confirming all workers.
- Archive the certificate, decision, payroll evidence and project records.
Frequently asked questions
Is a business trip covered by A1 rules?
Current Danish outgoing guidance says an application for a social-security decision is required when an employee works abroad, including short business trips, conferences and similar activity. Procedures and enforcement vary by country, so plan recurring travel rather than assuming short duration is exempt.
Does A1 mean no Danish tax?
No. A1 concerns social security. Danish income tax, A-tax, AM-bidrag, the 183-day treaty test and hiring-out-of-labour rules require separate analysis.
Does A1 remove the need for RUT?
No. RUT is a Danish notification for foreign service providers and posted workers. When it applies, it is handled separately from A1.
Does A1 give an employee permission to work in Denmark?
No. EU residence documentation and third-country work permits are immigration matters handled separately.
Does the employee need to carry the A1?
Business in Denmark says posted workers should have proof of home-country social-security coverage. Maintain an accessible copy for the employee/site while protecting personal data, and follow any sector or customer-specific original/digital evidence requirement.
Can the employer choose Danish social security because it is simpler?
No. Applicable legislation follows the coordination rules and authority decision. A special agreement may be requested in appropriate cases, but it is not a free election.
Coordinate the Danish registrations and evidence
NordicEstab can help organise the Danish workstream within an agreed scope: worker-route mapping, evidence requests, RUT and employer-registration coordination, payroll handoff and expiry tracking. The competent Danish or foreign institution decides social-security coverage and issues the certificate. Complex or disputed cases may require a specialist adviser.
For the registration sequence, see foreign-employer registration in Denmark. Connect the result to the broader first-employee checklist, or the construction-project setup guide for site-based work. Review permanent-establishment exposure separately from the employee’s coverage.
Hiring, posting or assigning people to Denmark?
Tell us the work countries, employee residence, legal employer, assignment dates and current A1 status. We can help map the Danish registrations and evidence around your coverage decision and coordinate the handoff to payroll and employer contributions.
Review my Denmark workforce setup
General operational guidance, checked against the official sources below on 16 October 2026. Coverage, contributions and service scope depend on the person, activity, applicable agreement and authority decision.
Official sources
Social security · Cross-border work
Social security and A1 certificates in Denmark
NordicEstab ApS · Published 17 October 2026 · 20 min read
An A1 certificate does one important job: it documents which country’s social-security legislation applies when a person works across borders. It does not determine where salary is taxed, whether a foreign company has a permanent establishment, whether RUT applies or whether the employee has permission to work in Denmark.
That separation matters. A posted employee can remain socially insured in the home country while owing Danish income tax and being covered by Danish posted-worker conditions. A foreign company can have no Danish permanent establishment and still need Danish social-security registration for an employee working permanently from Denmark. One answer cannot be copied into every workstream.
Official guidance checked: 16 October 2026.
Start with the work pattern
What social-security coverage means
Being covered by a country’s social-security legislation determines which system governs contributions and access to covered benefits. Udbetaling Danmark’s guidance lists Danish social-security areas including:
EU rules coordinate national systems; they do not create one identical European contribution rate or benefit package. Once the applicable country is established, that country’s national rules determine contributions and entitlement, subject to the coordination rules.
One country at a time
For EU/EEA and Swiss cross-border situations, a person is normally subject to one country’s social-security legislation at a time. The employee and employer cannot choose the least expensive system by contract. Nor can payroll simply split coverage between countries because the employee divides the week between them.
The institution’s decision should drive payroll registrations, contribution deductions and healthcare documentation. Where authorities are still coordinating, obtain advice on provisional treatment rather than making duplicate or zero payments without a documented basis.
What an A1 certificate proves
Portable Document A1 identifies the social-security legislation that applies to the person for the activity and period described. For example, an A1 issued by the German institution for a qualifying temporary posting to Denmark documents that German—not Danish—social-security legislation continues to apply during that posting.
The document should be checked against:
An A1 for a different employer, country, activity or expired period is not reliable evidence for the current assignment.
What an A1 certificate does not prove
On a small screen, swipe across the table to see all columns.
The practical rule is simple: use A1 only for the social-security conclusion it records.
Which situation are you dealing with?
On a small screen, swipe across the table to see all columns.
Situation 1: permanent work in Denmark
The default EU principle is that a person is covered where work is physically performed. An employee recruited to work continuously from a Danish home office or customer site is not transformed into a posted worker merely because the employer is incorporated abroad.
Indicators of an ordinary Danish work pattern include:
When Danish social security applies, the foreign employer should map Danish employer registration, ATP, AES, occupational-injury insurance and other contributions. This conclusion can arise even if the employer has no Danish subsidiary and even if a separate tax analysis concludes that the foreign company has no Danish permanent establishment.
Permanent local hire example
A Dutch company hires a sales manager who already lives in Copenhagen. The employee works from Denmark except for occasional meetings in the Netherlands. The arrangement is indefinite and the employee was not transferred from an existing Dutch role for a time-limited service.
Likely direction: Danish social security, subject to a multi-state review if the foreign work becomes regular and predictable. The employer should not request a posting A1 merely to preserve Dutch contribution rates.
Situation 2: qualifying temporary posting to Denmark
EU coordination permits an exception for a genuine temporary posting. A worker sent by an employer to another EU/EEA country or Switzerland can normally remain in the sending country’s system for up to 24 months when the applicable conditions are met.
The authority will consider facts including:
The competent institution assesses the complete facts. A contract label, project end date or group secondment letter is evidence, not the decision.
Direct employment relationship
During the posting, the sending employer should continue to retain the core employment relationship. Relevant facts can include who recruits, pays, directs, disciplines and can terminate the worker. Intra-group recharges or day-to-day instructions at a Danish site do not automatically decide the outcome, but they must be disclosed accurately.
No replacement posting
The ordinary rule is not designed to keep one position continuously under sending-country coverage through a series of replacement workers. Check earlier workers on the same role or project, not only the proposed employee’s own assignment length.
24 months is not a guaranteed entitlement
Twenty-four months is the ordinary maximum for a qualifying posting, not an automatic allowance for every cross-border assignment. If the facts fail the posting test, work-country coverage can apply from the start.
Extension beyond 24 months
EU rules allow competent institutions to agree an exception in the person’s interest. Current Danish guidance describes a special individual agreement that may retain Danish coverage for an outgoing assignment of more than two years but no longer than three years. It requires agreement between Udbetaling Danmark and the other country and is not automatic. Other sending countries may apply their own procedure and policy under the coordination rules.
An extension is not guaranteed. Resolve coverage for the additional period before relying on it in payroll. The EU–UK Trade and Cooperation Agreement route has a maximum posting period of 24 months; the Danish guidance states that this cannot be extended under that route.
Temporary posting example
A Polish engineering company sends an engineer who normally works in Poland to install equipment in Denmark for eight months. The Polish company remains the employer, conducts substantive operations in Poland and the worker will return to the Polish role. No replacement arrangement exists.
Likely direction: apply to the Polish institution for A1 before the Danish work begins. Separately assess RUT, Danish working conditions, tax, VAT, permanent establishment and right to work.
Situation 3: regular work in two or more countries
Multi-state work is not the same as a sequence of separate postings. It involves a normal, predictable pattern of work in at least two countries—for example weekly travel, recurring customer visits, international transport or regular cross-border remote work.
The 25% residence-country threshold
If an employee performs a substantial part of their activity in the country of residence, that country’s legislation generally applies. EU guidance uses at least 25% of working time and/or remuneration as the indicator, assessed with the overall situation and expected pattern over the following 12 months.
When less than 25% is performed in the residence country, employer location and the number and countries of employers become decisive. Examples include:
These are routing rules, not a do-it-yourself election. Notify the institution in the employee’s residence country. That institution makes a provisional determination and coordinates with other relevant institutions.
Twelve-month forecast and actual monitoring
The 25% analysis is forward-looking but must reflect reality. Prepare a reasonable 12-month forecast of:
Track actual days or hours against the forecast. A material shift may require a new decision and payroll change.
Multi-state example
An employee lives in Germany and works for one Danish employer. They work three days a week in Denmark and two days from home in Germany.
Forty percent of work is performed in the residence country, which is above 25%. Under the general multi-state rule, German social-security legislation would normally apply. The employee or employer should notify the German institution and obtain the decision/A1. Danish payroll tax may still apply to Danish workdays under separate rules.
Cross-border remote work and the Øresund Region
Remote-work policies can change social-security coverage even when the employment contract and salary remain unchanged.
Current Danish guidance states that, under the general approach, working from home in the residence country at least 25% of the time can move coverage to that country. One home-working day a week may remain below 25%, depending on the actual percentage. Two or more days a week commonly exceeds it.
Denmark–Sweden Øresund agreement
Denmark and Sweden have a special route for certain employees who:
The employee and employer must apply for the Øresund social-security agreement; it is not automatic.
If less than 25% is worked in Sweden, the employee should contact Försäkringskassan, which decides coverage under the ordinary multi-state rules. Where the employee does not fit the Øresund criteria, use the general rules or another available Article 16 route rather than assuming the Danish system continues.
Broader European telework agreement
A multilateral framework agreement allows certain employees between participating states to request employer-country coverage where residence-country cross-border telework is at least 25% but less than 50%. Participation is country-specific and changes over time. Denmark was not listed as a participating state on the official depositary’s list checked on 16 October 2026. Do not apply the framework to a Denmark arrangement unless the current official signatory list and the competent institutions confirm eligibility. The specific Denmark–Sweden Øresund process may still be relevant.
Frontier workers: live in one country and work in Denmark
An employee who lives in another European country, works in Denmark and returns home daily or at least weekly is generally a frontier worker. EU guidance states that the work country is responsible for social-security coverage, subject to special healthcare and unemployment rules.
If the employee works only in Denmark, Danish coverage will commonly apply. If the employee also works from home or performs duties in other countries, switch to the multi-state analysis.
An employee living abroad but insured in Denmark may need the Danish special health-insurance card or other documentation. An employer can apply for the special card on the employee’s behalf with a signed power of attorney and required employment and identity details.
Self-employed people working temporarily in Denmark
A self-employed person can post themselves temporarily while remaining in the home system if the applicable conditions are met. Current Danish guidance for outgoing self-employment identifies conditions including:
For Danish outgoing self-employment, Life in Denmark currently states at least two months of running the business before posting and looks at factors such as office, tax, professional authorisation and VAT registration.
For an inbound self-employed person, the home-country authority decides whether to issue A1. Denmark separately assesses whether the person is genuinely self-employed for RUT, tax, labour-law and other purposes. An A1 does not prevent reclassification in an unrelated legal area.
United Kingdom cases
The UK left the EU, but social-security coordination continues under two possible legal frameworks:
European Commission guidance warns that the protocol is similar to, but not identical with, the EU coordination regulations. Current Danish social-security guidance includes the United Kingdom in its cross-border work application information.
Do not describe a UK case simply as “non-EU” or automatically apply a bilateral-convention checklist. Identify which framework covers the employee, obtain the appropriate certificate from the UK or Danish authority and verify the exact benefits and contribution branches included.
Work outside the EU coordination rules
Denmark has bilateral social-security agreements with a number of countries and Quebec. These agreements differ and may cover narrower branches, such as pensions and ATP, than EU coordination. They do not all provide an EU A1. Check the relevant agreement and obtain its certificate of coverage or decision from the competent institution.
Where no relevant agreement applies, national rules can operate independently. This can create dual contributions, gaps in benefits and separate employer and employee registrations. There may be no single document resolving every branch. Contact the relevant institutions before finalising the assignment.
Who applies and where?
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Do not send an inbound German or Polish posting application to Udbetaling Danmark merely because the host workplace is in Denmark. The sending-state institution issues the A1 if its legislation continues to apply.
Danish outgoing A1 application: what to prepare
The official employer application page requests or may request:
For a complete case file, also prepare:
Avoid attachments that contradict the form—for example a “temporary” assignment letter paired with an indefinite relocation policy.
Application timing and pending decisions
Apply before the assignment where possible. Official Danish pages checked on 16 October 2026 gave different indicative times for an ordinary one-country posting: five weeks on Life in Denmark and three weeks in the Business in Denmark guide. Both showed three weeks for multi-country work and 24 weeks for special agreements.
These are planning estimates, not a guaranteed decision date. Check the current case-specific guidance when applying, submit complete information and allow extra time for cooperation between institutions.
While the application is pending
An application receipt is not the same as an issued A1. Before allowing work to begin:
Some authorities or sites may impose fines or refuse site access when required evidence is missing. Danish outgoing guidance explicitly warns of those risks abroad. Do not state that a pending application always protects the employer.
A1, EHIC and S1 compared
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Life in Denmark states that a worker posted to Denmark may need a valid EHIC and A1 for temporary healthcare. If the person moves residence to Denmark during the posting, an S1 or S072 may need validation by Udbetaling Danmark so the person can receive a Danish health-insurance card.
Do not tell an employee that A1 alone guarantees every healthcare registration or family benefit. Coordinate the relevant benefit documentation with International Health Insurance.
Danish obligations that may remain despite A1
An inbound A1 can keep the employee in the sending country’s social-security system. The foreign company may still need to address:
Place the A1 decision inside a broader mobilisation checklist. For site-based assignments, the construction-project setup guide connects the separate registration and project-document requirements.
When Danish social security applies
If the employee is covered by Denmark, the employer must implement the relevant Danish obligations. These can include:
Determine coverage and arrange the relevant insurance before work starts, then complete the applicable employer and payroll registrations in time for the first pay run. The contribution rules and deadlines require their own check.
A1 and Danish AM-bidrag
The Danish labour-market contribution is called AM-bidrag, but it is administered as part of the Danish income-tax system. An A1 decides social-security affiliation; it does not by itself determine whether AM-bidrag or Danish salary tax is due.
The Danish Tax Agency describes AM-bidrag as a tax. Do not switch it off simply because an A1 establishes coverage abroad.
Send the A1 to the relevant Danish tax adviser or payroll owner, but require a separate written tax conclusion before changing A-tax or AM-bidrag treatment.
Change and expiry controls
Review the social-security decision when any of these events occur:
A1 evidence register
Maintain these fields for every cross-border worker:
Set the renewal review months before expiry, not on the final day.
Employer implementation checklist
Before contracting or assignment approval
Before work starts
During the assignment
At extension or close
Frequently asked questions
Is a business trip covered by A1 rules?
Current Danish outgoing guidance says an application for a social-security decision is required when an employee works abroad, including short business trips, conferences and similar activity. Procedures and enforcement vary by country, so plan recurring travel rather than assuming short duration is exempt.
Does A1 mean no Danish tax?
No. A1 concerns social security. Danish income tax, A-tax, AM-bidrag, the 183-day treaty test and hiring-out-of-labour rules require separate analysis.
Does A1 remove the need for RUT?
No. RUT is a Danish notification for foreign service providers and posted workers. When it applies, it is handled separately from A1.
Does A1 give an employee permission to work in Denmark?
No. EU residence documentation and third-country work permits are immigration matters handled separately.
Does the employee need to carry the A1?
Business in Denmark says posted workers should have proof of home-country social-security coverage. Maintain an accessible copy for the employee/site while protecting personal data, and follow any sector or customer-specific original/digital evidence requirement.
Can the employer choose Danish social security because it is simpler?
No. Applicable legislation follows the coordination rules and authority decision. A special agreement may be requested in appropriate cases, but it is not a free election.
Coordinate the Danish registrations and evidence
NordicEstab can help organise the Danish workstream within an agreed scope: worker-route mapping, evidence requests, RUT and employer-registration coordination, payroll handoff and expiry tracking. The competent Danish or foreign institution decides social-security coverage and issues the certificate. Complex or disputed cases may require a specialist adviser.
For the registration sequence, see foreign-employer registration in Denmark. Connect the result to the broader first-employee checklist, or the construction-project setup guide for site-based work. Review permanent-establishment exposure separately from the employee’s coverage.
Hiring, posting or assigning people to Denmark?
Tell us the work countries, employee residence, legal employer, assignment dates and current A1 status. We can help map the Danish registrations and evidence around your coverage decision and coordinate the handoff to payroll and employer contributions.
Review my Denmark workforce setup
General operational guidance, checked against the official sources below on 16 October 2026. Coverage, contributions and service scope depend on the person, activity, applicable agreement and authority decision.
Official sources