Article 12 Regulation 883/2004: The 24-Month Posting Rule and Its Conditions

Article 12 is a special rule that departs from insurance where the work is done (Article 11(3)(a) of Regulation (EC) No 883/2004), and the A1 shows the result. It governs the social security of posted workers in the EU, not their pay.

The four conditions below are the law today. From 2 November 2028 Regulation (EU) 2026/2359 replaces Article 12 for persons sent from that date.

What Does Article 12 of Regulation 883/2004 Provide?

Article 12 of Regulation (EC) No 883/2004 contains two posting rules: paragraph 1 for employed persons and paragraph 2 for self-employed persons who go to pursue a similar activity in another Member State, each for an anticipated duration of up to 24 months. The Regulation has applied since 1 May 2010 (consolidated text on EUR-Lex); paragraph 1 in its current wording comes from Regulation (EU) No 465/2012 of 22 May 2012.

The details sit in Article 14 of Regulation (EC) No 987/2009 and in Decision A2 of the Administrative Commission of 12 June 2009. The wider rules are explained under social security for posted workers under Regulation 883/2004.

The Four Conditions of Article 12(1)

An employed person stays under the sending State's law only if all four conditions of Article 12(1) are met at the same time.

The conditions apply to the anticipated duration at the start, not only in hindsight.

How Decision A2 Interprets the Posting Conditions

Decision A2 of the Administrative Commission for the Coordination of Social Security Systems, of 12 June 2009 and applied since 1 May 2010, sets out how institutions interpret Article 12, including the indications for prior affiliation, the gap between postings and the cases Article 12 does not cover. It is published in OJ C 106, 24.4.2010, p. 5 (Decision A2 on EUR-Lex) and guides institutions; the Regulation is the rule.

Prior Affiliation Before the Posting

Decision A2, point 1, indicates that a person recruited to be posted has been subject to the sending State's legislation for at least one month before the posting starts.

For the self-employed the indication is at least two months of prior activity (Decision A2, point 2). From 2 November 2028 both become at least three months under Article 14(1) and (3) of Regulation (EC) No 987/2009 as amended.

Where the Employer Normally Carries Out Its Activities

An employer normally carries out its activities in the sending State when it ordinarily performs substantial activities there, other than purely internal management activities, taking account of all criteria characterising its activities (Article 14(2) of Regulation (EC) No 987/2009, consolidated text). The criteria must suit the real nature of each employer's activities, and the text stays unchanged after 2 November 2028.

The Court of Justice applied the test in C-404/98 Plum (9 November 2000, decided under Regulation (EEC) No 1408/71): a construction company that performs all its activities, apart from internal management, in the host State cannot post workers under the posting rule.

Situations Article 12 Does Not Cover

Decision A2, point 4, excludes two situations from the posting rule:

• the posted worker is placed at the disposal of another undertaking in the host State or in another State;
• the worker is recruited in one Member State to be sent by an undertaking in a second Member State to a third Member State.

In both, the general rules of Title II of Regulation (EC) No 883/2004 decide which law applies.

How the 24 Months Are Counted

The 24 months under Article 12(1) of Regulation (EC) No 883/2004 refer to the anticipated duration of the work in the other Member State, assessed when the posting starts, and not to a period that can be extended.

A new posting of the same worker, by the same undertakings, to the same Member State is possible only after at least two months have passed since the previous posting ended (Decision A2, point 3(c)). Decision A3 of 17 December 2009 aggregates uninterrupted posting periods that began under Regulation (EEC) No 1408/71 with those under Regulation (EC) No 883/2004.

Beyond 24 months the sending State's law can continue only through an exception agreement under Article 16(1) of Regulation (EC) No 883/2004, which Regulation (EU) 2026/2359 does not amend.

The Replacement Ban

Article 12(1) of Regulation (EC) No 883/2004 does not apply where the person is sent to replace another person, so rotating workers cannot keep one post under the sending State's law.

The Court of Justice held in C-527/16 Alpenrind (6 September 2018) that the posting rule does not apply where a worker replaces another employer's posted worker; the legal effect of the A1 in that case is explained under A1 certificate validity and binding effect. Today the ban covers employed persons; the self-employed follow from 2 November 2028.

What Changes for Article 12 on 2 November 2028

Regulation (EU) 2026/2359 replaces Article 12 of Regulation (EC) No 883/2004 and tightens Article 14 of Regulation (EC) No 987/2009 from 2 November 2028, but the conditions described above remain the law for every posting today. The Regulation, adopted on 7 October 2026 and published in the Official Journal on 27 October 2026, has been in force since 1 November 2026 (Regulation (EU) 2026/2359 on EUR-Lex).

From 2 November 2028 in the EU; take-over by Norway, Iceland, Liechtenstein and Switzerland pending as of 5 November 2026.

Under Article 87b(4) of Regulation (EC) No 883/2004, Article 12 in its wording before 1 November 2026 continues to apply to employed persons sent, and self-employed persons who start a similar activity, before 2 November 2028; the Title II transitional period to 2 November 2036 does not apply to it.

All 2028 changes are explained in the revision of Regulations 883/2004 and 987/2009.

How Issuing Institutions Apply the Conditions

Issuing institutions apply Article 12 and Decision A2 through their own published practice, and three of them state the indications in their own words.

The competent institution of the sending State decides and issues the A1 under Article 19(2) of Regulation (EC) No 987/2009.

How to Meet the Article 12 Conditions for a Posting

Check the four Article 12 conditions for each posting before it starts, and again when the duration, the host State or the worker changes. Every obligation is listed in the posting compliance checklist.

1. Confirm that the employer performs substantial activities in the sending State beyond internal management.
2. Confirm the worker's prior affiliation: at least one month, Decision A2's indication today.
3. Estimate the anticipated duration and keep it at 24 months or less.
4. Check that the worker does not replace another person and that two months have passed since an earlier posting to the same State.
5. Inform the competent institution, today "whenever possible in advance" under Article 15(1) of Regulation (EC) No 987/2009, and request the A1 certificate as set out in how to apply for an A1 certificate.
6. For postings starting on or after 2 November 2028, plan for three months' prior affiliation of a person recruited to be posted and for prior notification before the activity starts.

The A1 decision belongs to the sending State's institution.

Beyond 24 Months: The Labour-Law Clock, Exception Agreements and Work in Several States

Article 12 governs only social security for a single posting of up to 24 months, and six neighbouring rules decide what happens outside it.

• Labour-law clock: after 12 months, or 18 on a motivated notification, more host terms apply under Article 3(1a) of Directive 96/71/EC and the worker stays posted (long-term posting after 12 months); host pay follows the Posting of Workers Directive 96/71/EC.
• Beyond 24 months: the Article 16 exception agreement under Article 16(1) of Regulation (EC) No 883/2004.
• Work in two or more Member States: Article 13 of Regulation (EC) No 883/2004, explained under working in two or more Member States.
• Habitual cross-border telework of at least 25 % and less than 50 % of working time in the State of residence: the Framework Agreement under Article 16(1) of Regulation (EC) No 883/2004.
• United Kingdom: detached workers up to 24 months, not sent to replace another detached worker, under Article SSC.11(1)(a) of the Protocol on Social Security Coordination to the Trade and Cooperation Agreement, (UK-EU social security rules).
• Postings outside Europe: where a bilateral agreement applies, a certificate of coverage, not an A1; see social security agreements and certificates of coverage.

Questions on the 24-Month Posting Rule

Five questions come up most often.

Can a posting under Article 12 last longer than 24 months?

No: Article 12(1) of Regulation (EC) No 883/2004 covers an anticipated duration of up to 24 months in the EU, the EEA and Switzerland. Beyond that, the sending State's law continues only under an Article 16 exception agreement (Article 16(1) of that Regulation).

Must a worker be insured in the sending State before being posted?

For a person recruited to be posted, Decision A2, point 1, indicates at least one month of prior affiliation today (EU, EEA and Switzerland). For persons sent in the EU from 2 November 2028, Article 14(1) of Regulation (EC) No 987/2009 as amended requires at least three months.

Can a posted worker be replaced by a colleague?

Not under Article 12(1) of Regulation (EC) No 883/2004 today in the EU, the EEA and Switzerland. For persons sent in the EU from 2 November 2028, new Article 12(3) allows a replacement if all persons concerned together stay within 24 months.

Is the 24-month limit the same as the labour-law limit of 12 or 18 months?

No: 24 months is the social-security limit of Article 12(1) of Regulation (EC) No 883/2004, while 12 months, or 18 after a motivated notification, is the labour-law threshold of Article 3(1a) of Directive 96/71/EC after which more host terms apply.

Do the 2028 Article 12 rules apply in Norway, Iceland, Liechtenstein and Switzerland?

Not as of 5 November 2026: Regulation (EU) 2026/2359 applies in the EU from 2 November 2028, and its take-over by Norway, Iceland, Liechtenstein and Switzerland is pending, so Article 12(1) of Regulation (EC) No 883/2004 in its current wording remains the text for them.