In November 2026, the European Commission announced that revised EU rules on social security coordination had entered into force on 1 November. Most operational provisions will apply from 1 November 2028. The reform covers applicable legislation for posted workers and people who work in several countries, as well as the coordination of unemployment, family and long-term care benefits.

Posting decisions need a history

The Commission describes a three-month period of prior affiliation for posted workers and a two-month break after the maximum 24-month posting period. A mobility team preparing for those changes will need to reconstruct the relevant history before an assignment is approved. The practical question is whether it can identify the worker’s prior affiliation and earlier postings from reliable records, including where the worker was hired shortly before departure or moved between group entities.

That history may be scattered across HR records, local payrolls and files held by an external adviser. The employer can start by sampling assignments and asking each country team to show how it reaches its conclusion. The sample should include a short-notice posting, a repeat assignment and someone who works in more than one country as part of their normal role. Record what evidence is available, where an interpretation is required and who has authority to resolve it.

Keep state and employer benefits aligned

The regulation coordinates national systems, as opposed to turning them into one EU benefits plan. For multinational employers, a change in the competent social security system can nonetheless affect how employees navigate eligibility for public benefits and how an employer’s private cover fits alongside them. Plan administrators should review the points at which an employee is referred to a national institution or asked for proof of coverage. This is especially relevant when the affected employee or a dependant resides in another country.

An employee handbook can help if it explains where to ask a question and what documents to retain. It can cause problems if it presents the company’s interpretation of a case as a determination by the competent authority. A useful communication design gives one point of contact for the worker and clearly distinguishes the company’s benefit promises from information about statutory entitlements. Local guidance should be reviewed before templates are distributed.

Put transition decisions on a calendar

A group project should distinguish today’s rules, future application dates and questions that still require implementing guidance. That distinction matters for assignments spanning the transition. As a test, choose an assignment that begins before November 2028 and continues afterward. Ask whether the existing documentation is sufficient, whether any new information will have to be collected, and who will confirm the treatment when the applicable provisions and guidance have been reviewed.

Board oversight should focus on exposure and the quality of controls rather than individual assignment approvals. Useful measures include the share of postings with verified records, how long exceptions remain unresolved and whether payroll and benefits teams receive the same decision. An increase in exception cases may reflect better detection. The report should distinguish missing evidence, genuine uncertainty and delays in obtaining an authority’s answer.

The two-year transition gives employers time to repair the records and handoffs on which the new process will depend. The most useful first step is to appoint an owner for cross-border social security decisions and have that person trace a small number of complex cases from assignment request through payroll and employee communication. The failures found in that exercise will tell the employer more about readiness than a policy rewrite alone.

A country team should also record where it has relied on an adviser’s interpretation and when it last checked it. During the transition, a decision that was reasonable when made may need to be revisited.

Sources

European Commission | EU social-security coordination reform resets posting and cross-border benefit rules

European Union | Regulation (EU) 2026/2359