A1 CERTIFICATE (POSTED WORKER SOCIAL SECURITY) — APPLICATION PACK & GUIDANCE
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PART A — OVERVIEW & GUIDANCE
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The two main legal bases. An A1 is normally issued on one of two grounds:
- Posting — Article 12 of Regulation 883/2004. An employer temporarily sends (posts) a worker to another member state to work on its behalf, or a self-employed person temporarily carries out a similar activity in another member state. The posting must be time-limited (as a rule, an anticipated duration not exceeding 24 months) and must not be to replace another posted worker.
- Multi-state activity — Article 13 of Regulation 883/2004. A worker normally pursues an activity as an employed and/or self-employed person in two or more member states. Article 13 contains rules (based on residence, the share of activity, and the location of the employer) to determine the single applicable legislation.
Why it matters.
- It avoids double social-security contributions in both the home and host states for the same work.
- It confirms the worker's continued coverage (pensions, healthcare entitlement, benefits) under the home state's system.
- It is frequently required to be carried during the posting and produced on request to host-state authorities, labour inspectorates, or clients; some host states will not permit work to begin without it.
Before you start. Identify the competent institution in the home country, gather the worker and employer details in Part B, and apply before the posting or activity begins wherever possible. Many institutions accept applications online.
PART B — DETAILS WORKSHEET
Complete every applicable field. Use the same details on the cover letter in Part C.
1. Worker details
| Full legal name | ________ |
| Date of birth | ________ |
| Nationality | ________ |
| Social security / national insurance number (home state) | ________ |
| Home country of residence | ________ |
| Home address | ________ |
| Status (employed / self-employed) | ________ |
2. Employer details (leave blank if the applicant is self-employed)
| Employer legal name | ________ |
| Company / employer registration number | ________ |
| Employer home country | ________ |
| Employer registered address | ________ |
| Contact person / phone / email | ________ |
3. Posting / activity details
| Basis of application (posting under Art. 12 / multi-state activity under Art. 13) | ________ |
| Host member state(s) | ________ |
| Posting / activity start date | ________ |
| Posting / activity end date | ________ |
| Nature of the work / activity | ________ |
| Place(s) of work in host state (site / client / address) | ________ |
| Host-state client / host entity (if any) | ________ |
| Estimated share of activity per state (multi-state cases) | ________ |
PART C — STEP-BY-STEP & COVER LETTER
Step-by-step.
- Step 1 — Identify the competent institution in the home country (the social-security / national insurance body responsible for issuing A1 certificates). Record its name and address below.
- Step 2 — Determine the correct basis — posting (Art. 12) or multi-state activity (Art. 13) — and confirm the eligibility conditions are met (temporary duration, not replacing another posted worker, etc.).
- Step 3 — Complete and submit the application to the competent institution, using this worksheet's details, before the posting or activity starts. Many institutions offer an online portal; otherwise submit the institution's form with the cover letter below.
- Step 4 — Receive the A1 from the competent institution once approved.
- Step 5 — Carry the A1 during the posting and produce it on request to host-state authorities, inspectorates, or clients.
- Step 6 — Renew or extend if needed — apply for a further/extended A1 before the current one expires if the work continues or is prolonged (extensions may require agreement between institutions under Art. 16).
| Competent institution name | ________ |
| Competent institution address | ________ |
| Reference / case number (if any) | ________ |
Cover letter to the competent institution
________, ________
To: ________
Dear Sir or Madam,
Re: Application for a Portable Document A1 — certificate of applicable social security legislation (Regulation (EC) No 883/2004, Art. ________)
I am writing to apply for an A1 certificate confirming that the applicable social security legislation is that of ________ in respect of the worker named below, who will be ________ in ________.
Worker: ________; social security / national insurance number: ________; date of birth: ________.
Employer (if applicable): ________, registration number ________.
Period: from ________ to ________. Nature of work: ________.
The supporting details are set out in the attached worksheet. Please issue the A1 certificate for the period stated and confirm any further information you require. I confirm the information provided is true and complete to the best of my knowledge.
Yours faithfully,
Signature: ________
Name: ________
Capacity (worker / employer representative): ________
Date: ________