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If your A1 certificate is delayed, refused, or contains wrong information, deal with the institution that issued—or should issue—the certificate. For a delay, request a written status update and confirmation of any missing evidence. For a refusal, obtain the formal decision, reasons, remedy and appeal deadline, then use the country’s stated procedure promptly. For incorrect details, request a written correction or review and provide evidence. There is no single European Union deadline or correction form for every country, so the issuing country’s rules and decision notice control.
What an A1 certificate proves
An A1 is a statement of which country’s social-security legislation applies to a person during cross-border work. It can show that social-security contributions are being paid under one country’s system rather than another’s, particularly when someone is posted temporarily or works in two or more countries. It replaced the older E101 and E103 forms.
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An A1 is not a general work permit. It does not by itself settle income-tax liability, immigration permission, payroll obligations, working-time rules, or every employment requirement in the host country. Those questions may require separate permits, registrations or advice.
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Identify which problem you actually have
The correct response depends on whether you are waiting for a decision, have received a refusal, are correcting an issued document, or are dealing with a challenge from another country.
| Situation | Immediate action | What controls the next step |
|---|---|---|
| Application is pending | Ask the competent institution whether the file is complete, what is missing and when a decision is expected. | National processing rules and the facts of the planned work. |
| Application refused | Obtain the formal written decision and follow the stated reconsideration or appeal route. | Reasons in the decision and the national appeal deadline. |
| Issued A1 has factual errors | Submit a written correction or review request identifying each wrong field and attaching evidence. | The issuing institution’s correction procedure and any national remedy information. |
| Host country disputes an issued A1 | Send the challenge to the issuing institution and ask whether institutional dialogue has begun. | EU coordination and dialogue rules, plus any separate fraud or court proceedings. |
If your A1 application is delayed
1. Contact the competent issuing institution
Use the channel shown in your application acknowledgement or on the institution’s official website. Include your reference number, applicant name, employer or self-employed status, countries and exact work dates. Ask three specific questions:
- Is the application complete?
- What exact document or information, if any, is still required?
- When should a decision be expected?
Ask for the reply in writing. A written status response can establish what the institution has received and whether a missing item is holding the file.
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2. Explain the practical consequence of the delay
Tell the institution when the posting or cross-border work is due to begin, where it will occur and whether an employer, client or host authority has requested proof. Ask whether it can provide a written confirmation that the application is pending and what evidence, if any, it accepts while the file is being decided. Do not assume that an application receipt, an employer letter or another national form automatically substitutes for an issued A1; the issuing authority must explain what it will accept.
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3. Preserve a complete record
Save the submitted form, supporting records, acknowledgement, payment or delivery proof, every message, and requests from the employer or host country. Record the dates on which work is planned and any change to those dates. This creates a clear chronology if you need to escalate or explain why the certificate was not available.
4. Escalate an unresponsive file
If the issuing office does not respond, ask its national liaison body or complaints channel how to escalate. Include the original reference and copies of earlier requests rather than opening unexplained duplicate applications. Keep proof that the escalation was sent.
The European Commission’s expert FAQ says the relevant institution must forward information and issue documents without delay and within the time limits laid down by the legislation it applies. That statement does not create one EU-wide number of days for every A1 application. The applicable timing comes from the issuing country’s rules.
If the application was refused
Get a formal decision, not just an informal message
If you have only received a telephone explanation or an informal email, request the formal written decision. The document should state why the application was rejected and identify available remedies and appeal periods. The European Commission says a rejection must indicate its grounds, remedies and appeal periods.
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Check the deadline immediately
Do not wait for an extended informal exchange if a deadline is running. The Commission’s general claims FAQ states: “Each country has its own deadlines and procedures to appeal an administrative decision. It is very important to act promptly and make sure to respect these deadlines. Ask your national institutions for advice.” There is therefore no universal EU number of days that can safely be quoted without knowing the issuing country and the decision notice.
Match the remedy to the reason
Read the refusal line by line. If it says information was missing or misunderstood, ask the institution what evidence would address that point and submit it through the accepted channel. Depending on national law and the wording of the decision, the appropriate route could be a corrected application, a request for reconsideration, an administrative appeal or a court challenge. The notice should tell you which route is available.
Send any appeal or review in a way that produces proof of submission. Keep the transmission receipt, attachments and a copy of the exact text filed. If you are close to the deadline, comply with the formal filing method first; a later explanatory submission may not preserve an appeal that was never lodged correctly.
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Check every field against the real arrangement
Compare the A1 with the facts it is meant to cover:
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- your name and identifying information;
- whether you are an employee or self-employed person and the employer details;
- the countries in which work will be performed;
- the start and end dates or other coverage period; and
- the social-security legislation identified as applicable.
Check dates especially carefully when a posting has been extended, shortened or moved. A certificate can be factually wrong even when the underlying application was made in good faith.
Submit a written correction or review request
Address the request to the issuing institution. Identify the exact field that is wrong, state the correct fact, explain the discrepancy and attach supporting evidence such as the application, contract, assignment schedule or official correspondence. Ask the institution to acknowledge receipt and either issue a corrected A1 or provide a written decision explaining why it will not change the document.
EU-level guidance does not establish one correction form or one correction deadline for all countries. Follow the institution’s national instructions and any appeal information supplied with its decision. Do not edit the certificate yourself, mark up a copy, or present an application receipt as though it were a corrected A1.
Act quickly when work is already under way
If the wrong detail affects a live posting or a host authority has questioned the document, notify the issuing institution promptly and preserve the host authority’s correspondence. State which work dates and locations are affected. Ask whether the institution has a specific interim confirmation process; the acceptable evidence depends on the national authority.
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When another country challenges an issued A1
An issued A1 has a distinct legal position from a pending application. The Court of Justice of the European Union has held that an A1 issued by one Member State binds the institutions and courts of the state where the work is performed for as long as the issuing state has not withdrawn it or declared it invalid. The Court has also recognized that a certificate may have retroactive effect.
This does not mean every certificate is automatically correct. It means a host institution that doubts the document should raise the issue with the issuing institution through the EU dialogue and reconciliation procedure rather than simply disregarding the A1. In its 2023 judgment, the Court said the issuing institution’s decision to withdraw must be taken through that procedure after reconsidering whether its legislation applies. A provisional suspension by the issuing institution does not, by itself, remove the certificate’s binding effect.
Send any host-country challenge to the issuing institution and ask whether it has opened the institutional dialogue. Keep the original A1, the challenge, inspection notices and all replies together. Allegations of fraud and national court proceedings can create separate issues; obtain case-specific legal advice if either is involved.
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- Are you the competent institution for the legislation I believe applies?
- Is my application complete, and what exact evidence is missing?
- What are the written reasons for refusal?
- Which remedy is available, and what is the filing deadline?
- How do I request correction or reconsideration of an issued certificate?
- If another country has challenged the A1, have you started the dialogue with that institution?
- What written confirmation, if any, can you provide while the application or correction is pending?
Digital processing: what is changing
The Commission’s 2026 digitalisation Q&A says the Electronic Exchange of Social Security Information system is operational in all 32 participating countries and that institutions had handled more than 42 million cases through the system since 2019. These figures describe institutional exchange, not a guarantee that an individual A1 will be issued within a particular period.
The same Q&A says the Commission proposed a regulation on digitalisation of social-security coordination in September 2026. The proposal envisages online requests, digital documents and clearer or binding processing deadlines. It remains a proposal as of that September 2026 update; do not treat it as a current, uniform A1 deadline or as a rule already implemented in every country.
A practical record-keeping checklist
- Application reference and submission date.
- Copy of the application and every attachment.
- Employer, client or self-employment information used in the application.
- Countries, addresses and dates of planned work.
- Acknowledgements, delivery receipts and status requests.
- Formal refusal, correction request or host-country challenge.
- Evidence submitted in response and proof of submission.
- Names, dates and substance of telephone calls, followed by written confirmation.
Keep the file until the work period, any audit or dispute and all available appeal periods have ended. If the facts change, notify the issuing institution rather than relying on an A1 issued for an earlier arrangement.
Quick Recap
Bottom line for each scenario
- Delayed: contact the competent institution with the reference number, ask what is missing and request a written status and any accepted interim evidence.
- Refused: obtain the formal reasons and remedy information, then file the correct national review or appeal before the stated deadline.
- Incorrect: identify each wrong field, provide evidence and request correction or review from the issuing institution.
- Challenged by the host state: preserve the challenge and ask the issuing institution to use the EU dialogue and reconciliation process.
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