Posting Compared: Secondment, Business Trip, Agency Work, Frontier Work and Intra-Corporate Transfer

The label matters because a posting changes two things at once. Under Directive 96/71/EC, the host State's terms reach the posted worker on the matters listed in its Article 3(1); under Article 12(1) of Regulation (EC) No 883/2004, the sending State's social security legislation stays in place for an anticipated duration of up to 24 months. Arrangements outside the definition follow other rules, so the comparison starts from the EU rules for posted workers.

This page sets out the two-question test, a table placing seven arrangements against a posting, and three detailed comparisons: secondment, business trips and agency work.

The Test Behind Every Comparison

Every comparison on this page asks two separate questions: does the host State's labour law reach the worker as a posted worker under Directive 96/71/EC, and which State's social security legislation applies under Title II of Regulation (EC) No 883/2004? The labour-law question turns on Article 1(3) of Directive 96/71/EC, which lists three posting situations: (a) a contract for services, (b) a posting to an establishment or an undertaking of the same group, and (c) hiring-out by a temporary employment undertaking or placement agency. In each situation the posting undertaking keeps the employment relationship with the worker during the posting.

The social security question has one answer per person. Title II of Regulation (EC) No 883/2004 makes a worker subject to a single legislation, as a rule that of the State where the activity is pursued (Article 11(3)(a)). Article 12(1) of that Regulation is the posting exception: an employee sent to another Member State keeps the sending State's legislation where the anticipated duration does not exceed 24 months and the worker is not sent to replace another person. The A1 shows which legislation applies: under Article 19(2) of Regulation (EC) No 987/2009, the competent institution certifies that its legislation applies and, where appropriate, until what date and under what conditions.

The two clocks never mix. Under Article 3(1a) of the Posting of Workers Directive, a posting becomes long-term after 12 months, or 18 months on a motivated notification, and the worker stays posted; the 24 months belong to social security only. An arrangement can therefore pass one test and fail the other: a posting planned for 30 months remains a posting under the Directive, while Article 12(1) of Regulation (EC) No 883/2004 does not reach that anticipated duration. The labour-law side is set out in the Posting of Workers Directive guide.

Seven Arrangements Set Against a Posting

Seven arrangements are often taken for a posting; Table 1 sets each against the posting rules and names the EU or national provision that decides it. Three rows lead to the comparison guides of this section (secondment, frontier work and intra-corporate transfer), and four lead to the guides that own the topic.

Every obligation before, during and after a posting is listed in the posting compliance checklist.

Posting or Secondment: One Set of Facts, Two Labels

EU law has no separate regime for secondment: a secondment abroad is a posting, with every posting rule, when the worker keeps the employment relationship with the sending employer and works in another Member State for a limited period. "Secondment" is an HR and contract label. In EU law the word appears in the definition of an intra-corporate transfer, a "temporary secondment" by an undertaking established outside the EU to an entity of the same group (Article 3(b) of Directive 2014/66/EU), and not in the posting directives.

A new local contract changes the answer. Where the worker signs an employment contract with the host entity, the arrangement is not a posting and no A1 under Article 12 of Regulation (EC) No 883/2004 is issued for it. The legislation of the State of work then applies under Article 11(3)(a) of that Regulation.

The word in the contract does not decide the classification. What decides it are the facts measured against Article 2(1) and Article 1(3) of Directive 96/71/EC: a limited period, work in another Member State and one of the three posting situations. The conditions for keeping home cover under Article 12 are set out under the Article 12 posting rule.

Business Trip or Posting: The 2026 Definition and the 2028 Exemption

Since 1 November 2026, EU social security law defines a business trip: a temporary activity, limited in time and related to the business interests of the employer or the self-employed person, that excludes the provision of services or the delivery of goods but includes business meetings, cultural and scientific events, conferences and seminars, or receiving training (Article 1(2)(eb) of Regulation (EC) No 987/2009). The definition sits in the social security regulation only. On the labour-law side, a posting under Directive 96/71/EC needs one of the three Article 1(3) situations, and the definition itself separates the trip from the provision of services.

Today the definition exempts nothing, and the normal rules of Title II of Regulation (EC) No 883/2004 apply to a business trip. From 2 November 2028, Article 15(1b) of Regulation (EC) No 987/2009 as amended exempts business trips from prior notification in every sector; activities of no more than three consecutive days within 30 consecutive days are exempt from prior notification too, except construction work listed in Annex 6. Persons sent before 2 November 2028 keep the old Article 12 of Regulation (EC) No 883/2004 (Article 87b(4) of that Regulation).

The 2028 rules come from the revision of Regulations 883/2004 and 987/2009, Regulation (EU) 2026/2359 of 7 October 2026, published on 27 October 2026 and in force since 1 November 2026. Its take-over by Iceland, Liechtenstein and Norway is pending (EEA-Lex: under scrutiny, as of 12 November 2026) and by Switzerland pending as of 5 November 2026. Each amended article is listed under the revision of Regulations 883/2004 and 987/2009.

Agency Work across Borders: Three Different Time Limits

A temporary work agency that hires out a worker to a user undertaking established or operating in another Member State posts that worker: hiring-out is the third posting situation, Article 1(3)(c) of Directive 96/71/EC. Since 30 July 2020, when Directive (EU) 2018/957 began to apply, Article 3(1b) of Directive 96/71/EC gives posted agency workers the terms that Article 5 of Directive 2008/104/EC guarantees, and the user informs the agency of its working conditions and remuneration. The optional one-month exemption of Article 3(3) of Directive 96/71/EC covers only postings under Article 1(3)(a) and (b), never agency postings.

Chain posting has its own rule. Where the user sends the agency worker on to work in a further Member State, the agency counts as the posting undertaking, and the user informs the agency "in due time before commencement of the work" (Article 1(3), second and third subparagraphs, of Directive 96/71/EC).

Three clocks can run at once for a posted agency worker. Long-term posting under Article 3(1a) of Directive 96/71/EC starts after 12 months, or 18 on a motivated notification (labour law). Article 12(1) of Regulation (EC) No 883/2004 covers an anticipated duration of up to 24 months, and beyond that only an exception agreement under Article 16(1) keeps the sending State's legislation (social security). National agency law adds its own limit, such as Germany's limit of 18 consecutive months for hiring out the same agency worker to the same user under § 1(1b) AÜG, the German Temporary Agency Work Act (as of 12 November 2026). The two 18-month figures belong to different laws. What applies after 12 months is explained under long-term posting.

What a Comparison Does Not Settle

This comparison classifies arrangements under posting and social security law only; residence permits, tax and pay levels follow their own rules. It explains how each rule works and does not tell a particular employer or worker which legislation applies to them.

Residence and Work Permits for Non-EU Staff

Whether a non-EU national may enter, reside and work in the host State is decided by that State's immigration authority, never by the posting rules.

The posting rules themselves cover non-EU staff. The Your Europe business page (30 September 2026) states: "You may also post workers who are nationals of countries outside the EU, provided they are legally residing and working in an EU country. The same posting rules apply to these workers." The case law behind posting third-country nationals is explained under posting third-country nationals.

Tax, Payroll and Pay Levels

Classifying an arrangement as a posting settles no tax or payroll question: the 183-day tax rule is not a posting rule. Pay and conditions for posted workers follow Article 3 of Directive 96/71/EC on the matters listed in its Article 3(1).