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A1 Certificate Spain: correctly classifying posting, relocation of residence and multi-state employment

Responsible for this content: Frank Menze

The A1 certificate for Spain is a bit of a red flag for many Germans on Mallorca — usually because it's misunderstood. The document confirms which social security law applies to a person working across borders, and protects against having to pay contributions in two countries at the same time. However, the far more common confusion lies elsewhere: anyone who has permanently relocated their residence to Mallorca and works from there for their German employer is, as a rule, not posted — and for them, an A1 under Art. 12 is simply the wrong instrument. In this guide, you'll learn how to correctly classify your own situation (posting, relocation of residence, or multiple employment), which deadlines and conditions apply in each case, and how the application process works.

A1 certificate Spain 2026: Secondment & rules

Are you posted, have you emigrated, or do you work in two countries — and do you know which law applies to you?

What the A1 certificate is — and what it isn't

The A1 certificate is an EU-wide recognised document confirming which national social security law applies to a person temporarily working in another member state. It exclusively governs social security — health insurance, pension, unemployment and accident insurance. It says nothing about your tax residency; that is governed independently by the 183-day rule. The legal basis is the European coordination regulations Regulation (EC) No 883/2004 and the Implementing Regulation (EC) No 987/2009.

The territorial scope covers, in addition to the EU member states, Iceland, Liechtenstein, Norway, Switzerland and the United Kingdom. Employees, civil servants and self-employed persons all require the certificate equally if they are temporarily working across borders.

Note:Whether a required A1 certificate is actually in place is currently being checked more strictly. The reason is new national rules against undeclared work and wage dumping — the German Pension Insurance (Deutsche Rentenversicherung) explicitly points to this changed administrative practice.

The central misconception: "German employer" doesn't automatically mean "posting"

This is the most important section of this article, because it's where most guides become imprecise. An A1 under Art. 12 requires a posting — and this is more narrowly defined than many assume.

Your situation What legally applies Legal basis Do you need an A1 under Art. 12?
You normally live and work in Germany and are temporarilysent to Mallorca to work there for your German employer German social insurance law remains applicable in exceptional cases Art. 12 Regulation (EC) 883/2004 Yes
You have relocated your residence permanently to Mallorca and continue to work from there for your German employer (remote work) The principle of the place of employment applies, generally Spanish social insurance law Place-of-employment principle under Regulation 883/2004 No — Art. 12 is the wrong approach here
You regularly work both in Germany and from Mallorca (multiple employment activities) Law of the country of residence applies if a substantial part of the activity is carried out there Art. 13 Regulation (EC) 883/2004 Yes, but under Art. 13

According to this system, a posting only exists if you normally work in Germany, are sent to Spain by your employer for a period fixed in advance, and afterwards return to your usual workplace. Anyone lacking this return connection — for example because they have permanently moved to Mallorca — does not fall under the concept of posting. Workation (a short, holiday-like stay abroad involving mobile work) and permanent remote work must also be distinguished from classic posting. You can read more about this in our guide on Remote Work Mallorca and on the home office permanent establishment, which can represent a separate tax risk for the employer.

Posting under Art. 12: deadlines and conditions

If a genuine posting exists, German social insurance law remains applicable for a limited period.

Aspect Rule
Maximum duration of posting 24 months
Applies to All EU member states, including Spain
EEA (Iceland, Liechtenstein, Norway) The 24-month period has applied since 1 July 2012
Switzerland The 24-month period has applied since 1 April 2012
Foreseeable from the outset to last longer than 24 months No A1 under Art. 12 possible — only an exceptional agreement under Art. 16 between both states
Third-country nationals The posting rules have applied to them since 1 January 2011

Note:If it is already clear at the planning stage that the assignment will last longer than 24 months, the German authority may not issue an A1 under Art. 12. In this case, the only option is a bilateral exceptional agreement under Art. 16 of Regulation (EC) 883/2004.

Extension and interruption of the posting

A posting that has already begun can be extended — but only under three conditions that must all be met simultaneously.

Requirement for an extension Explanation
Total duration remains under 24 months Calculated from the start of the first posting, not from the extension
The extension was not foreseeable An assignment planned from the outset to be longer does not count
Timely application before expiry The application must be submitted before the deadline expires

Interruptions are also regulated: a posting is only considered ended once the interruption lasts longer than two months. Shorter interruptions — such as a trip home — do not end the posting; the original A1 remains valid until the planned end date, provided the total 24-month limit is not exceeded. If the interruption lasts longer than two months and it is foreseeable that the activity will last longer than 24 months in total, a new posting must be applied for after the interruption ends — not only after the originally planned period has expired. This new posting can then again run for up to 24 months.

Multiple employment: the 25 percent rule under Art. 13

Anyone who works regularly both in Germany and from Mallorca — for example with recurring stays in both countries — does not fall under the posting rules, but under Art. 13 of Regulation (EC) 883/2004. What matters here is whether a substantial part of the activity is carried out in the country of residence. A guideline figure of 25 percent of working time or remuneration applies. If this share is reached in the country of residence — in this case Spain, if you live there — the law of the country of residence generally applies.

For people in this situation, the question of Pluriactividad often also arises, i.e. the combination of employed and self-employed activity in Spain — you can find details on this in our guide on Pluriactividad Spain.

An A1 certificate under Art. 13 is issued for a maximum of five years issued, so that the underlying facts can be reviewed at regular intervals. Within this five-year period, no further reviews generally take place without a specific reason.

Those who live permanently on Mallorca and work remotely for Germany

This is the constellation affecting many emigrants that is most often handled incorrectly: residence permanently relocated to Mallorca, continuing to work from home office for the German employer, no intention to return, no time limit. Here it is not Art. 12 that applies, but generally the law of the place of employment — in other words, Spanish social security law. An A1 under Art. 12 would not provide legal certainty in this situation, because the material requirement of a posting (temporary nature, connection to a return) is missing.

For the employer, such cases additionally raise the question of whether the permanent activity from the Spanish place of residence establishes a tax permanent establishment — this is a separate risk, independent of the social security question. You can find details on this in the guide to the home office permanent establishment. Anyone who is instead regularly employed by a Spanish or Mallorcan company will find the basics in the guide Working as an employee on Mallorca.

Application: Who issues the A1, and how does the process work?

The document is issued exclusively upon application (Art. 19 para. 2 of Regulation (EC) No. 987/2009). In Germany, the responsible health insurance fund, the Deutsche Rentenversicherung or — depending on the type of insurance — an occupational pension scheme is usually responsible. For employees, in practice the employer submits the application via certified payroll software or an electronic reporting portal; the self-employed apply for the A1 themselves.

  1. Clarify which constellation applies: posting (Art. 12), permanent relocation of residence, or multiple employment (Art. 13).
  2. Identify the responsible authority (health insurance fund, DRV or occupational pension scheme).
  3. Submit the application electronically before the start of the activity abroad.
  4. Carry the A1 document with you throughout the entire stay abroad.
  5. Inform the responsible authority immediately of any relevant changes (see next section).

For the practical handling — especially when questions about registration in Spain, tax residency or the gestoría arise at the same time — it is worth contacting a specialised tax adviser for expats or a gestoría.

Obligations to cooperate during the period of validity

Those who hold an A1 are not free of obligations: if significant changes occur before the validity expires, these must be reported without delay.

Event Obligation
Change of employer Immediate notification to the responsible authority
Change of place of residence Immediate notification to the responsible institution
Exceeding the annual income threshold (compulsory health insurance exemption limit) Copy of the A1 additionally sent to the responsible collection agency/health insurance fund, so that contribution collection for pension and unemployment insurance is initiated

These obligations to cooperate are explicitly pointed out already at the time of application. Anyone who fails to meet them risks the A1 no longer corresponding to the actual facts — and thereby losing its protective effect.

A1 and taxes: two separate issues

A common misconception: the A1 certificate exclusively governs social security. Whether you become tax resident in Spain is decided independently, based on the 183-day rule and other criteria such as the centre of vital interests. It is therefore possible to be (temporarily) covered by social security in Germany while simultaneously becoming tax resident in Spain, or vice versa. Both questions — social security and tax residency — must be examined separately, ideally together with a tax advisor familiar with both legal systems.

Most common mistakes

  • Blanket assumption that a "German employer" automatically means an A1 obligation under Art. 12. What matters is whether there is a genuine, from the outset time-limited posting with an intention to return.
  • A1 applied for under Art. 12, even though the place of residence has already been permanently relocated to Mallorca. This does not correspond to the actual facts and offers no reliable legal certainty.
  • Extension applied for, even though the longer assignment was planned from the outset. The criterion of unforeseeability is then not fulfilled.
  • Change of residence or change of employer not reported during the current period of validity.
  • A1 and tax residency equated with one another. Both are independent legal questions with their own criteria and deadlines.
  • In the case of multiple employment, the 25 percent threshold ignored and German law continued to be assumed without reflection.

What comes next?

After the posting ends (at the latest after 24 months), the applicability of German social security law under Art. 12 automatically ends — unless there is an exception agreement under Art. 16. Anyone who then stays permanently on Mallorca should check in good time whether their social security status changes and whether a new A1 (for example under Art. 13 in the case of continued activity in both countries) is required. The transition into regular employment with a Spanish employer or into self-employment as an autónomo with a foreign employer should also be properly documented for social security purposes.

Checklist: A1 certificate for Spain

  • Own situation clearly classified: posting, relocation of residence, or multiple employment
  • In case of secondment: return reference and fixed-term limitation determined from the outset documented
  • Keep the 24-month deadline in view, especially in the case of multiple extensions
  • For foreseeably longer assignments: clarify an exception agreement under Art. 16 instead of an A1 under Art. 12
  • For activity in two countries: 25 percent threshold for the country of residence checked
  • Application submitted electronically and in good time before departure
  • A1 document carried at all times during the entire stay abroad
  • Change of employer or change of residence reported without delay
  • Tax residency (183-day rule) checked independently of this

Conclusion

The A1 certificate for Spain is not a form that you apply for "just to be safe" for every cross-border activity — it is the legal proof of which social security law actually applies. For genuine, fixed-term secondments with a return reference, Art. 12 with its 24-month limit is the correct framework. For anyone who has permanently relocated their residence to Mallorca and works from there for a German employer, the Spanish place-of-employment principle generally applies — an A1 under Art. 12 does not help here. Anyone who works regularly in both countries should keep the 25 percent threshold under Art. 13 in view. In all three cases the following applies: social security and tax residency must be examined separately, and changes during the period of validity must be reported without delay.

Official sources

As an employee living permanently in Mallorca who works from home for my German employer, do I need an A1 certificate under Art. 12?
Generally not. Art. 12 requires a temporary posting with an intention to return; where residence has been permanently relocated, the principle of the place of employment applies instead.
What is the maximum duration of a posting to Spain?
The maximum duration is 24 months under Regulation (EC) No 883/2004 and No 987/2009, applying to Spain as to all EU member states.
What happens if it is clear from the outset that the assignment will last longer than 24 months?
In that case, no A1 certificate under Art. 12 can be issued. The only option then is an exception agreement under Art. 16 of Regulation (EC) 883/2004 between the states involved.
Can a posting be extended?
Yes, but only if the total duration from the start of the first posting does not exceed 24 months, the extension was not foreseeable, and it is applied for in good time before expiry.
What does the 25 per cent rule mean in cases of multiple employment?
Anyone who regularly works in several member states is subject to the law of their state of residence if a substantial part of their activity is carried out there; 25 per cent of working time or remuneration serves as the benchmark.
How long is an A1 certificate valid under Art. 13?
It is issued for a maximum of five years, so that the situation can be reviewed at regular intervals.
Who applies for the A1 certificate?
For employees, this is usually done electronically by the employer to the responsible institution (health insurance fund, Deutsche Rentenversicherung or occupational pension scheme); self-employed persons apply for it themselves. The basis for this is Art. 19(2) of Regulation (EC) No 987/2009.
What do I need to report if something changes during the validity of my A1?
Changes of employer and changes of residence must be reported to the responsible institution without delay; if the annual earnings threshold is exceeded, a copy of the A1 must also be sent to the responsible health insurance fund.