Without coordinated registration at the point of enrolment, a pension entitlement earned in Germany by a Portuguese national existed in German records and nowhere else. When that worker eventually claimed in Portugal, the Portuguese institution had no record of the German contributions, no assigned registration number for the insured person, and no means of verifying what the German institution held. Decision No 117 of 7 July 1982 — adopted by the Administrative Commission of the European Communities on Social Security for Migrant Workers — addressed this gap not by altering substantive entitlements but by creating a structured information relay that ran from the moment of registration forward.
The Legal Framework
The Administrative Commission's authority to act rested on four provisions. Under Article 81(a) of Council Regulation (EEC) No 1408/71 of 14 June 1971, the Commission is responsible for dealing with all administrative questions arising from that Regulation and subsequent Regulations. Under Article 81(d) of Regulation (EEC) No 1408/71, it is required to foster and develop cooperation between Member States with a view to expediting the award of benefits.
The specific procedural authority derives from Article 50(2) of Council Regulation (EEC) No 574/72 of 21 March 1972, which empowers the Administrative Commission to fix the methods for implementing Article 50(1) of Regulation 574/72. Article 2(1) of Regulation (EEC) No 574/72 separately authorises it to draw up models of certificates, certified statements, declarations, applications, and other documents necessary for applying the Regulations.
The substantive obligation being operationalised is Article 50(1)(a) of Regulation (EEC) No 574/72: the requirement that Member States collect and exchange identifying information about migrant workers registered under social security schemes in a State of which they are not nationals. The preamble to Decision No 117 acknowledges directly that in some Member States the institutions concerned were not yet, for technical reasons, in a position to implement all provisions of that Article. Decision No 117, preamble
The Three-Form Chain
The operational architecture of Decision No 117 is a three-node relay, each step mandated in sequence.
Under paragraph 1 of Decision No 117, each Member State must collect three categories of information about every migrant worker: the worker's identity; the name of the registering institution in the other Member State; and the insurance number issued by that institution. Additional information capable of simplifying and expediting the award of the pension may also be included.
Under paragraph 2 of Decision No 117, when a registering institution enrols a worker who is not a national of that State, it forwards the paragraph 1 information on Form E 501 to the body designated by the competent authority of its own State. That designated body then forwards the same Form E 501 onward to the body designated by the competent authority of the Member State of which the worker is a national.
The response runs in reverse. Under paragraph 3 of Decision No 117, the designated body in the home Member State, on receipt of Form E 501, forwards Form E 502 to the institution that sent E 501, indicating in particular the registration number assigned to the insured person in that Member State.
The relay sequence is therefore:
→ Registering institution collects paragraph 1 data → Registering institution sends Form E 501 to its own designated body → That designated body forwards Form E 501 to the home-State designated body → Home-State designated body returns Form E 502 with the home-State registration number
Amendments to a worker's identification data after initial registration do not travel on E 501. Under paragraph 2.1 of Decision No 117, Form E 551 is the instrument for any subsequent changes to identification data. The designated bodies applicable per Member State are listed per Member State in the original Official Journal tables at paragraph 2.2 of the Decision.
Batch Processing and the Annual Limit
Under paragraph 3.1 of Decision No 117, each designated body collects Forms E 501, E 502, and E 551 and sends them together in a single batch to the other designated bodies, at intervals of not more than one year.
The annual cap is the critical constraint. A worker registered in January could, under this mechanism, have their home-State designated body unaware of the registration for up to twelve months if the batch dispatch falls at the end of the permitted cycle. For practitioners advising on benefit claims where entitlement thresholds or qualifying periods are in issue, the timing of batch dispatch in the relevant year is a material procedural fact — one that must be verified against actual institutional records.
The Denmark and Netherlands Exception
Paragraph 7 of Decision No 117 establishes a specific exemption for two Member States. The institutions of Denmark and the Netherlands will not forward Form E 501 to other Member States.
The paragraph specifies both directions of the carve-out precisely:
→ Form E 501 should still be sent to the designated bodies in Denmark and the Netherlands — the inbound obligation on other Member States remains fully intact → The designated bodies in Denmark and the Netherlands are not required to remit Form E 502 in response
The practical consequence: a registering institution in Belgium that enrols a Dutch national must still send Form E 501 through the standard chain to the Dutch designated body. The Dutch designated body receives it but is not obligated to return Form E 502 confirming the Dutch registration number.
The preamble attributes the broader implementation gaps to "technical reasons," and the paragraph 7 carve-out reflects those limitations applied to the outbound forwarding capacity of Danish and Dutch institutions at the time of adoption.
Stateless Persons and Refugees
The three-form chain assumes a home Member State — the State of the worker's nationality to which Form E 501 is directed. That assumption fails for stateless persons and refugees. Paragraph 4 of Decision No 117 resolves the routing problem: their information is sent to the designated body of the Member State to whose legislation they were first subject.
First subjection to legislation — not residence, habitual domicile, or the location of the registering institution — is the criterion. This ties the routing rule to the foundational structure of Regulation (EEC) No 1408/71, which determines applicable legislation primarily by reference to the Member State under whose scheme contributions have been made.
Direct Routing and Institutional Agreements
The standard chain routes Form E 501 from the registering institution to its own designated body, which then forwards to the home-State designated body. Paragraph 5 of Decision No 117 permits a shortened alternative: having consulted the Administrative Commission, the competent authority of a Member State may decide that the paragraph 1 information should be forwarded by the registering institution directly to the designated body of the worker's home State. This bypasses the intermediary domestic designated body but requires a deliberate decision by the competent authority following consultation with the Administrative Commission.
Paragraph 6 of Decision No 117 provides flexibility at the institutional level. Any other method of communicating the same paragraph 1 information may substitute for Forms E 501, E 502, and E 551, provided the institutions concerned agree. The information obligation under paragraph 1 remains unchanged; only the vehicle changes. Absence of the standard forms in institutional archives does not necessarily mean the information exchange did not occur.
Replacing Decision No 103
Paragraph 8 of Decision No 117 states that the Decision replaces Decision No 103 of 29 May 1975 and applies with effect from 1 January 1983. The Decision was published in Official Journal C 238 of 7 September 1983.
The preamble characterises the relationship to Decision No 103 as completion and updating, rather than wholesale revision. The introduction of the E 551 amendment form and the codification of the Denmark and Netherlands carve-out are identifiable additions over the 1975 baseline. The effective date of 1 January 1983 preceded Official Journal publication by eight months, confirming the Decision was operative through administrative channels before it received public notice in the Official Journal.
Frequently Asked Questions
What triggers the obligation to send Form E 501?
Registration of a worker in a Member State of which they are not a national triggers the obligation. The registering institution must forward the paragraph 1 information on Form E 501 to its own designated body, which then forwards it to the home-State designated body. The obligation attaches at the point of registration, not at the point of a pension claim. Decision No 117, paragraph 2
Why are Denmark and the Netherlands exempt from forwarding Form E 501?
Paragraph 7 provides the exemption without elaborating the specific technical basis; the preamble's reference to Member States not yet in a position to implement all provisions of Article 50(1)(a) provides the context. The inbound obligation — that other Member States send E 501 to Danish and Dutch designated bodies — remains intact. Only the outbound forwarding and the reciprocal E 502 response are exempted. Decision No 117, paragraph 7
How does the routing work for stateless workers who have no Member State nationality?
Under paragraph 4 of Decision No 117, information on stateless persons and refugees is sent to the designated body of the Member State to whose legislation they were first subject — not the State of residence or current employment. Decision No 117, paragraph 4
Can institutions use a method other than Forms E 501, E 502, and E 551?
Yes, but only by mutual agreement. Paragraph 6 of Decision No 117 permits substitution of any other method of communicating the same information, provided the institutions concerned agree. The paragraph 1 information obligation remains; only the format may change. Decision No 117, paragraph 6
Every answer carries its citation.
The full text of Decision No 117 (document identifier 31983Y0117) and Regulation (EEC) No 574/72 are searchable on omnilaw.ai. Research across the Union, settled in seconds.
