Totalization Agreements: How to Avoid Paying Social Security Tax in Two Countries

Core principles

What problem do totalization agreements solve?

Without a totalization agreement, a worker employed in a foreign country could owe Social Security taxes to both the U.S. and the foreign country — effectively paying twice for a benefit they may never fully receive from either system. Totalization agreements solve this by establishing clear rules for which country's system covers a worker in each situation.

The agreements have two primary functions:

1. Eliminate dual taxation: Determine which country's Social Security system applies, so the worker and employer pay taxes to only one system.
2. Combine work credits (totalize): Allow workers who split careers between countries to combine credits from both to meet benefit eligibility requirements they could not meet in either country alone.

How to get a Certificate of Coverage

The Certificate of Coverage is the operational document that makes the agreement work. Here is who issues it and how to obtain it:

For U.S. workers going abroad

Your employer (or you, if self-employed) requests the certificate from the Social Security Administration's Office of International Programs. You can request it by calling SSA at 410-965-7306 or by writing to the office. The certificate is typically valid for up to 5 years for posted employees. Your employer then provides the certificate to the foreign country's social security agency to prove you are exempt from that country's Social Security taxes.

For foreign workers coming to the U.S.

The worker's home country social security agency issues the certificate. The worker or employer provides it to the U.S. employer, who then does not withhold U.S. Social Security and Medicare taxes from the worker's wages. The employer should keep the certificate on file in case the IRS questions the FICA exemption.

How combining work credits works

The U.S. requires 40 quarters of coverage (roughly 10 years of work) to qualify for Social Security retirement benefits. If you worked in the U.S. for only 6 years and the rest of your career was in a totalization agreement country, your U.S. credits alone would not qualify you. But the totalization agreement lets you add your foreign credits to meet the 40-quarter threshold.

Which countries have agreements with the U.S.?

The SSA maintains the authoritative and current list of totalization agreement countries on their Office of International Programs website. As of the most recent update, agreements are in force with countries across Europe (including the UK, Germany, France, Italy, and others), as well as Canada, Mexico, Australia, Japan, South Korea, and more. New agreements are periodically negotiated and added.

If your country does not have a totalization agreement with the U.S., you may be subject to dual Social Security taxation. In that case, you pay FICA in the U.S. and may also owe social security contributions in your home country, with no mechanism to avoid the overlap.

Totalization vs. income tax treaties

These are separate agreements serving different purposes:

A country may have an income tax treaty with the U.S. but no totalization agreement, or vice versa. Each agreement operates independently.

Self-employed workers and totalization

If you are self-employed and work in a totalization agreement country, the agreement determines which country's self-employment / social security tax applies. Generally, self-employed individuals pay into the system of the country where they reside. If you are a U.S. citizen living and self-employed in France, the U.S.-France totalization agreement may direct you to pay only French social security contributions, exempting you from U.S. self-employment tax on those earnings.

You still need a Certificate of Coverage to prove the exemption. For self-employed individuals, you request it from the SSA (if the U.S. system applies) or from the foreign agency (if the foreign system applies). See our self-employment tax calculator for estimating U.S. SE tax.

Common mistakes with totalization agreements

1. Not getting a Certificate of Coverage. Without the certificate, your U.S. employer must withhold FICA. Retroactive claims are possible but complicated — get the certificate before starting work.
2. Confusing totalization with income tax treaties. A totalization agreement only covers Social Security/Medicare. It does not affect your income tax obligations.
3. Assuming all countries have agreements. Many major countries (China, India, Brazil, Russia) do not have totalization agreements with the U.S. Workers in these countries face potential dual taxation.
4. Exceeding the posted-worker time limit. Most agreements limit the posted-worker exemption to 5 years. After that, the worker must enroll in the host country's system.

For visa-specific tax guides, see our pages on H-1B taxes, TN visa taxes, and FICA explained.