Complete guide for those who worked in the USA: the Italy–US Social Security Agreement, international totalization, pro-rata pension, double taxation and the impatriate regime.
Published: 2026-06-10 · Last verified: 2026-06-10 · 12 min
Have you worked in the United States? A growing number of Italian citizens spend a meaningful portion of their professional life in the United States. Some relocate permanently for work or to start a business; others operate there for a few years under international contracts or corporate assignments and then return to Italy. In both cases the same fundamental question arises: what happens to the social-security contributions paid abroad, and how can they be put to work for pension purposes? Many fear the years worked in the USA are simply lost. That is not the case — but the correct answer requires understanding three instruments: the Italy–US Social Security Agreement, the mechanism of international totalization, and — on the tax side — the Italy–US Double Taxation Convention. The Italy–US Social Security Agreement The Agreement between the Italian Republic and the United States of America on Social Security entered into force on November 1, 1978 and was subsequently amended. It pursues two main goals: avoid double social-security contributions during periods of work abroad, and allow the valorization of insurance periods accrued in both countries for pension entitlement. Who is covered The Agreement applies to employees, the self-employed, professionals and — with specific rules — their dependents. It covers Italian citizens working in the USA, US citizens working in Italy, and third-country nationals lawfully resident in either State who work in the other. In Italy, the Agreement applies primarily to the compulsory general insurance managed by INPS (old-age, disability and survivors). In the USA, the reference system is federal Social Security, managed by the Social Security Administration (SSA). Detachment: working abroad without double contributions One of the most concrete benefits is the rule on social-security detachment. When an Italian worker is temporarily sent to the USA by their employer (or vice versa), they may continue paying contributions only in their country of origin for a limited period — generally five years, extendable by agreement between the competent authorities. This avoids paying contributions simultaneously in both countries on the same income. Detachment is not automatic. It must be formalized through a certificate of coverage (Certificate A/USA 6 for Italian workers detached to the USA) presented to the foreign employer. International totalization: combining contributions from both countries The most relevant mechanism for those with international careers is international totalization: a system that allows the sum of insurance periods accrued in Italy and the USA in order to verify minimum requirements for pension access in each country. How totalization works in practice Consider an Italian worker with 12 years of INPS contributions and 9 years of US Social Security. In the absence of any agreement, this worker would not on their own meet the minimum requirement for pension in either country (20 years in Italy for old-age pension; 40 credits, equivalent to 10 years, in the USA). Thanks to totalization, the 12 Italian years and the 9 American years are added for a total of 21 years, sufficient to mature the right to pension in both countries. Each country then pays its own quota, calculated in proportion to contributions effectively paid into its system. The pro-rata calculation The method provided by the Agreement is pro-rata. Each country — INPS on one side, SSA on the other — first calculates the theoretical pension that would be owed if all contributions had been paid into its own system. It then applies the proportion corresponding to the ratio between contributions effectively paid into its system and total totalized periods. | Step | Italian side | US side | |---|---|---| | 1 | INPS computes theoretical Italian pension on totalized periods | SSA computes theoretical US benefit | | 2 | INPS applies pro-rata = Italian years / total totalized years | SSA applies pro-rata = US credits / total totalized credits | | 3 | INPS pays Italian quota | SSA pays US quota | The US Social Security system: how credits work Unlike the Italian system — based on years and months of contribution — the US system measures contributions in credits. A worker may accrue a maximum of 4 credits per year. In 2024, one credit is earned per USD 1,730 of contribution-subject income. 40 credits (roughly 10 years) are needed for a US old-age pension on a standalone basis. Below 40 credits, totalization with Italian periods allows access to the minimum requirement. The US pension depends not only on contribution duration but also on the average of the 35 highest earning years, indexed for inflation. Someone who worked in the USA only a few years will have a smaller US benefit but will still receive it if they reach the minimum credits via totalization. Tax aspects: the Italy–US Double Taxation Convention Moving to the USA has tax consequences as well — often more complex and more onerous than the social-security ones. Italy and the United States are bound by a Tax Treaty signed in 1984 and subsequently updated. The Treaty allocates taxing rights over employment income, self-employment, dividends, interest, royalties, capital gains and pensions, establishing which State has exclusive taxing rights or whether both may tax at reduced rates. Tax residency: the most delicate issue Determining tax residency correctly is the first and most important step of any international planning. Physically moving to the USA does not automatically end Italian tax residency. Italian residency under art. 2 TUIR exists for the greater part of the tax year in the presence of civil-registry enrollment, domicile or residence in Italy. The Agenzia delle Entrate has historically taken strict positions toward taxpayers who relocated abroad while retaining significant ties to Italy: spouse or children resident in Italy, owned or rented real estate, economic activities or directorships in Italian companies. The …
No. Through international totalization, US SSA credits and Italian INPS periods are added to verify minimum requirements in both countries. With at least 6 SSA credits and sufficient Italian contribution, the right to pension matures in both systems.
The application can be filed directly with SSA via ssa.gov or through INPS, which acts as a liaison point and forwards the request to SSA. It is advisable to collect in advance all documentation on US income and contributions.
It depends on tax residency at the time of receipt. If the pensioner is resident in Italy, US Social Security is generally taxed only in Italy under the Tax Treaty. If resident in the USA, only in the USA. A case-by-case verification is essential.
Yes, with prior agreement between INPS and SSA. The extension is granted in specific situations and must be requested before the original detachment expires.
Book a consultation (USD 250 · 45 minutes) · Send a contact request
IIILEX International Consulting LLC is the Florida-based practice of Avv. Dott. Massimo Leonardi — Italian Attorney (Avvocato), Certified Public Accountant (Dottore Commercialista) and Statutory Auditor (Revisore Legale) with 30+ years of Italian practice. We work exclusively on cross-border matters between Italy and the United States.
IIILEX International Consulting LLC · 7901 4th St N STE 300, St. Petersburg, FL 33702 · us@3lex.us · +1 (786) 604-8764 · +39 335 344 9660