The long-awaited US-Romania Social Security Agreement entered into force on September 1, 2026, after the US Government transmitted the final diplomatic note on May 19, 2026. For employers moving talent between the two countries, this closes a gap that has cost real money on every assignment for years.
What Has Changed
The agreement eliminates dual social security taxation: employers and employees will no longer pay social security contributions to both Romania and the United States for the same period of work. Previously, an assignment between the two countries could trigger contribution obligations in both jurisdictions simultaneously.
Detached workers — employees temporarily transferred by their employer from one country to the other — can remain covered solely under their home country's social security system for up to 5 years, avoiding host-country contributions entirely for the duration of a typical long-term assignment.
The agreement also introduces totalization of insurance periods: individuals who have split their careers between Romania and the US can now combine contribution periods from both countries to meet pension eligibility thresholds, with each country paying a pro-rata benefit based on time actually worked within its borders.
The US Social Security Administration's Office of the Chief Actuary estimates that over the first seven fiscal years, the agreement will save employers and employees approximately $88 million in dual contributions, and will make around 2,300 people newly eligible for a combined $22 million in benefit payments they could not otherwise claim.
What This Means for HR and Mobility Teams
Any current assignment between Romania and the US that has been paying social security contributions in both countries should be reviewed immediately — the agreement is now in force, and continuing to pay both may mean overpaying for coverage that's no longer required.
The 5-year detached-worker coverage window changes cost modelling for long-term US-Romania assignments materially. An assignment planned around dual contributions as a fixed cost now has a lower true cost, which should be reflected in assignment budgets and compensation structuring going forward.
Employees with fragmented Romania-US work histories — particularly those nearing pension eligibility in either country — should have their combined contribution record reviewed now that totalization applies.
Action Steps
- Audit active Romania-US assignments for dual social security contributions that are no longer required under the agreement.
- Rebuild assignment cost models for US-Romania moves using the 5-year detached-worker coverage rule.
- Identify employees with split Romania-US work histories who may now qualify for totalized pension benefits.
- File the correct certificate of coverage to formally establish home-country-only coverage for detached workers going forward.
xpath.global's tax and social security team is applying the US-Romania totalization agreement to active assignments now, correcting contribution structures and identifying pension eligibility gains created by the September 2026 entry into force. [Speak to our team.](https://xpath.global)
"Sources: KPMG GMS Flash Alert 2026-129 — 2026; U.S. Embassy Romania — 2026."
