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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsUsually, you need an A1 certificate when you work across EU borders but remain covered by the social-security system of the country where you are insured. The main cases are a temporary posting by an employer, temporary cross-border work by a self-employed person, and regular work in two or more countries. The certificate records which country’s social-security legislation applies to you.
An A1 is not a general work permit. It does not decide your tax residence, immigration status, professional licensing, or every employment obligation in the country where you perform the work. Those questions must be handled separately.
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What an A1 certificate proves
The A1, commonly issued as the portable document PD A1, is a statement of applicable legislation. It shows the social-security institution in another country that you remain subject to the legislation of the issuing country for the cross-border activity covered by the certificate.
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The form is issued by the institution in the country whose social-security system covers you. Application channels, supporting evidence and processing times are set nationally, so the exact procedure differs between countries.
When an A1 is normally relevant
| Work pattern | Main rule | Who should start the process |
|---|---|---|
| Employee temporarily posted by an employer | Home-country coverage may continue for a qualifying posting for up to 24 months under the ordinary rule. | The employer, with the social-security institution in the sending country. |
| Self-employed person temporarily working abroad | Home-country coverage may continue when the foreign activity and continuing home activity satisfy the applicable posting conditions. | The self-employed person and the home-country social-security institution. |
| Regular work in two or more countries | Residence, the share of activity performed there and employment arrangements determine the applicable legislation. At least 25% of activity in the country of residence is the basic substantial-activity threshold. | The institution in the worker’s country of residence. |
These categories are materially different. A short assignment is not automatically treated as multi-country work, and someone who routinely works in several countries should not use the temporary-posting process without an assessment.
Employees sent temporarily to another EU country
When the posting route can apply
If an employer sends you to another EU country for a temporary assignment, you may remain insured in the sending country when the legal posting conditions are met. The ordinary maximum period is 24 months. The assignment must be genuinely temporary and fit the applicable coordination rules; the issuing institution examines the actual arrangement rather than relying only on the label used by the employer.
Who applies and when
Your employer should request the PD A1 from the competent social-security institution in the country where you are insured. The European Commission’s guidance says to apply before the posting starts. Starting work first and trying to regularise the position later can leave you unable to demonstrate which system applies during the initial period.
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What to give your employer
Provide accurate dates, the host-country work location, the nature of the assignment and any information the institution requests about your ordinary employment. If the assignment changes materially, tell the employer and institution; an A1 issued for one set of facts may not cover a different role, country or time period.
Self-employed work performed temporarily abroad
A self-employed person has a related but separate route. Contact the social-security institution in your home country in advance and request the PD A1. The foreign activity generally needs to be compatible with the work you normally carry out at home, and you must continue to satisfy the applicable conditions for remaining insured there. National authorities can require evidence of an established home activity and the planned foreign assignment.
Do not assume that simply invoicing clients from your home country is enough. The institution assesses the real pattern of work, continuity and the relationship between the home and foreign activities. If your business becomes established in the other country or the work is no longer temporary, a different determination may be required.
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People who work in two or more countries
Why the posting certificate is not the right shortcut
Regularly working in several countries is governed by the multi-country rules, not automatically by the 24-month posting rule. The assessment starts with your country of residence, your employers and the proportion of work carried out in each country.
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The 25% residence-country test
For the basic multi-country rule, performing at least 25% of your activity in your country of residence indicates that a substantial part of the work is carried out there. The percentage is assessed against the relevant work pattern, not a single unusual week. If you do not reach that threshold, rules involving the employer’s registered office or the structure of your employment may determine the applicable legislation.
Where to apply
Contact the social-security institution in your country of residence and describe every country in which you work, your expected schedule, your employers and your contractual arrangements. The institution coordinates with the other authorities and issues the appropriate determination or certificate. Do not ask an employer to process a temporary-posting application when your normal job is deliberately spread across countries.
Do you need an A1 when working remotely from another EU country?
Remote work abroad is not automatically covered by a special exemption. The answer depends on whether the arrangement is a temporary employer-directed posting, regular work in multiple countries, or a change of the place where you normally work and live.
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Before travelling, give your employer and the competent institution the planned dates, address, work schedule and contractual details. An A1 addresses social security only; it does not make a remote-work arrangement lawful under immigration, tax, labour-law or data-protection rules.
How to apply: practical steps
- Classify the work pattern. Decide whether this is a temporary employee posting, temporary self-employed activity, or regular work in multiple countries. If the pattern is unclear, ask the institution in your country of residence or insurance before you begin.
- Identify the competent institution. For an employee posting, this is generally the social-security institution in the sending country where the employee is insured. A self-employed person normally contacts the home-country institution. A multi-country worker starts with the institution in the country of residence.
- Apply before the cross-border work starts. The employer should submit the employee’s request before departure. Self-employed applicants should also contact the home institution in advance. National portals may use different names for the form, but ask specifically for the PD A1 or statement of applicable legislation.
- Supply complete facts. Include identity and insurance details, all work locations, start and end dates, employers or clients, the expected work pattern and information showing that the home-country conditions continue. Incomplete or inconsistent dates are a common reason for delay or a request for clarification.
- Check the issued document. Confirm that your name, countries, activity and coverage period match the assignment. Keep the certificate available in the format accepted by the host-country authorities and give a copy to the employer or contracting party where appropriate.
- Report changes. A new host country, longer stay, changed employer, altered schedule or end of the assignment can affect the determination. Notify the issuing institution instead of assuming the original A1 extends automatically.
EU-level guidance explains the categories but does not provide a single application directory for every country. Use the competent national institution’s current instructions for portal access, evidence and processing times.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How long does an A1 last?
For a qualifying temporary posting, the ordinary period under the EU rule is up to 24 months. The end date belongs to the specific assignment; it is not a universal two-year entitlement for every cross-border worker.
If the work must continue beyond the ordinary period, contact the issuing institution before the certificate expires. Remaining under the home-country system for longer requires an agreement between the authorities involved or another applicable coordination arrangement. Without that agreement, coverage under the host country’s system may apply. Continuing to work after expiry without a new determination can create contribution, reporting and enforcement problems.
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What an A1 does not cover
- Immigration permission: An A1 does not grant a visa, residence right or permission to enter the host country.
- Employment conditions: Posted-worker rules can impose host-country requirements on pay, working time, leave, health and safety, notifications and records. An A1 does not prove that those obligations have been met.
- Tax: Social-security coverage and income-tax residence are separate analyses. The A1 does not determine where salary or business income is taxed.
- Professional licensing: Regulated professions may require recognition, registration or a local licence.
- Every form of insurance: The document concerns statutory social-security legislation. Private health, accident, liability and employer benefits may follow different rules.
Examples that show the difference
Example 1: a three-month project
A company sends an employee from its home country to a client site in another EU country for three months, with the employee returning to the original job afterward. The employer should assess the posting conditions and request the PD A1 before departure. The certificate can document continued home-country social-security coverage for the assignment.
Example 2: a travelling consultant
A self-employed consultant spends part of the year serving clients abroad while maintaining the same business and activity at home. The consultant should contact the home institution before travelling. The authority must verify that the temporary foreign work and continuing home activity satisfy the relevant conditions; a certificate is not automatic merely because the business is registered at home.
Example 3: a cross-border employee
An employee lives in one EU country, works from home there two days each week and works at an employer site in another country three days each week as a permanent arrangement. This is a multi-country case. The worker should ask the institution in the country of residence to assess the 25% substantial-activity threshold and the employer arrangements rather than requesting a short-posting certificate.
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Example 4: an assignment extended past two years
An employee’s project runs longer than 24 months. The employer should approach the issuing institution before the original end date to seek an agreed extension or a new coverage determination. The employee should not assume the first A1 continues simply because the same project and employer remain in place.
Common mistakes and how to fix them
- Applying after departure: Start the request before the work begins. If you have already left, contact the institution immediately and explain the dates; do not fabricate a new start date.
- Treating A1 as a work permit: Ask the host-country authority or employer’s mobility team about immigration and posted-worker filings separately.
- Using a posting request for a permanent remote move: Describe the actual residence and normal work pattern so the institution can apply the correct rule.
- Ignoring a second employer or country: List every employment relationship and work location. Omitting one can lead to the wrong legislation being identified.
- Letting the end date pass: Track the certificate’s expiry and request an extension or reassessment early.
- Assuming national procedures are identical: Forms, online systems and evidence differ. Follow the instructions of the competent institution rather than copying another country’s process.
What about the United Kingdom?
The ordinary EU coordination rules described here do not automatically cover the United Kingdom. Special arrangements may apply depending on the person’s nationality, residence, employment history and dates. Anyone working between an EU country and the UK should check current official guidance for that specific combination before relying on an A1 route.
Before you start work abroad: a checklist
- Identify whether the work is temporary, self-employed temporary activity or regular multi-country work.
- Record residence, every work country, employers or clients, dates and expected percentages of activity.
- Ask the correct national institution for a PD A1 before the start date.
- Check the certificate’s countries, activity and expiry date.
- Handle tax, immigration, labour-law, licensing and private-insurance obligations separately.
- Report any change in location, schedule, employer or duration before it occurs.
The practical test is not simply “Am I working abroad?” It is “Which country’s social-security legislation applies to this particular cross-border work pattern?” An A1 is the official evidence of that answer when the coordination rules keep you insured in a country other than the one where the work is performed.
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