An SSA Certificate of Coverage is the document that proves a worker on temporary assignment abroad stays under U.S. Social Security and owes no social security tax to the host country. You request one from the Social Security Administration’s Office of Earnings and International Operations, either through the online portal at opts.ssa.gov or by mail or fax, and the agency asks that you allow 90 business days for processing. The certificate only matters when the assignment country has a totalization agreement with the United States, and 30 countries currently do.
Who Can Get a Certificate
Employees on Temporary Assignment
The core case is the “detached worker”: someone a U.S. employer sends to work temporarily in an agreement country. If the assignment is expected to last five years or less, the worker generally stays under U.S. Social Security and can get a certificate proving exemption from the foreign system.1Internal Revenue Service. Totalization Agreements If the assignment is expected from the start to exceed five years, the worker falls under the host country’s system instead.
The rule also covers transfers to a foreign affiliate rather than a direct branch, but only if the U.S. employer has entered into a Section 3121(l) agreement with the U.S. Treasury Department covering that affiliate. Without that agreement in place, U.S. coverage cannot continue during the foreign assignment.2Social Security Administration. U.S. International Social Security Agreements
Self-Employed Individuals
Self-employed people working in an agreement country can also qualify. The certificate exempts them from the host country’s social security taxes while they continue paying U.S. self-employment tax (SECA). Rules vary by agreement, so check the individual agreement descriptions on the SSA website for the country where you’ll be working. SSA guidance directs self-employed filers to attach a copy of the certificate to their U.S. income tax return each year.3Social Security Administration. RS 02001.005 Certificates of Coverage
Who Doesn’t Qualify
Workers hired directly by a foreign company in the agreement country generally do not qualify. The detached-worker rule requires an existing employment relationship with a U.S. employer, or self-employment ties to the United States, before the foreign assignment begins. Anyone whose assignment is expected from the start to exceed five years also falls outside the standard exemption.
What You Need Before You Apply
The SSA’s application asks for specific data. Missing or incorrect entries will delay processing, so pull everything together first:
- Worker’s full name. First name up to 15 characters, middle initial optional and one letter only, last name up to 20 characters.4Social Security Administration. Certificate of Coverage Request Forms – Help Topics
- Date of birth and country of birth. Both mandatory.
- U.S. Social Security number in 000-00-0000 format, with no slashes or spaces.
- Citizenship status. Whether the worker is a U.S. citizen, lawful permanent resident, or a national of the agreement country affects how the treaty applies.
- U.S. employer’s full legal name and registered business address.
- Name and address of the foreign office or affiliate where the worker will report.
- Date of hire with the U.S. company. The assignment start date cannot be earlier than the hire date.
- Beginning and expected ending dates of the foreign assignment. Both mandatory.
- Foreign social security number, if the worker has one.
- Section 3121(l) status if the worker will be at a foreign affiliate rather than a direct branch.
For self-employed applicants, the request asks about the nature of the business and where the work will be performed instead of employer details.
How to Submit the Request
Online
The SSA’s online Certificate of Coverage service at opts.ssa.gov is the fastest route. Employers, employer representatives, and self-employed individuals can all file there.5Social Security Administration. International Programs – Certificate of Coverage The system flags missing data before submission.
Mail or Fax
To file on paper, fax the request to (410) 966-1861 or mail it to:6Social Security Administration. Certificate of Coverage Request Form
Social Security Administration
Office of Earnings and International Operations
P.O. Box 17741
Baltimore, MD 21235-7741
Each agreement has its own paper form tailored to the country’s requirements. Pick the right one from the individual agreement descriptions on the SSA’s international programs page.
Processing Time and What Happens Next
The SSA asks that you allow 90 business days before following up. That’s roughly four and a half calendar months, not a few weeks. Once the certificate is approved, allow another two weeks for mailing.6Social Security Administration. Certificate of Coverage Request Form File well ahead of the assignment start date; a worker who arrives in the foreign country without a certificate may face immediate local withholding that is difficult to reclaim.
During review, the Office of Earnings and International Operations verifies the information against existing records to confirm the employer is a legitimate U.S. entity and the assignment falls within the agreement’s rules. If everything checks out, the agency issues the certificate and sends it to the employer or the self-employed individual.
After you receive the certificate, present it to the foreign tax authorities to formalize the exemption. Employers should keep a copy in their payroll records; if the IRS later asks why FICA is not being withheld for a foreign-based worker, the certificate is your documentation.3Social Security Administration. RS 02001.005 Certificates of Coverage Self-employed filers attach a copy to their annual U.S. tax return.
You can check the status of a pending request by emailing certificate@ssa.gov.
Countries with an Active Totalization Agreement
A certificate is only meaningful if the assignment country has a bilateral agreement with the United States. If the country isn’t on this list, there is no treaty-based exemption and the worker will owe social security taxes to that country regardless of any U.S. coverage.2Social Security Administration. U.S. International Social Security Agreements The 30 agreement countries, with each agreement’s effective date:
- Italy: November 1, 1978
- Germany: December 1, 1979
- Switzerland: November 1, 1980
- Belgium: July 1, 1984
- Norway: July 1, 1984
- Canada: August 1, 1984
- United Kingdom: January 1, 1985
- Sweden: January 1, 1987
- Spain: April 1, 1988
- France: July 1, 1988
- Portugal: August 1, 1989
- Netherlands: November 1, 1990
- Austria: November 1, 1991
- Finland: November 1, 1992
- Ireland: September 1, 1993
- Luxembourg: November 1, 1993
- Greece: September 1, 1994
- South Korea: April 1, 2001
- Chile: December 1, 2001
- Australia: October 1, 2002
- Japan: October 1, 2005
- Denmark: October 1, 2008
- Czech Republic: January 1, 2009
- Poland: March 1, 2009
- Slovak Republic: May 1, 2014
- Hungary: September 1, 2016
- Brazil: October 1, 2018
- Uruguay: November 1, 2018
- Slovenia: February 1, 2019
- Iceland: March 1, 2019
When an Assignment Runs Past Five Years
Every totalization agreement lets the authorities in both countries grant exceptions to the normal rules, but this requires agreement from both sides. The SSA states that exceptions are granted infrequently and only in compelling cases. An assignment that unexpectedly extends a few months beyond five years is the kind of situation where an exception might be approved; the provision is not designed to let workers or employers routinely elect coverage that conflicts with the normal rules.2Social Security Administration. U.S. International Social Security Agreements
Request an exception through the same channels used for the original certificate. Include a detailed explanation of why the assignment was extended and evidence that the worker still has a primary connection to the United States. If the exception is denied, the worker shifts into the foreign country’s social security system, which can trigger retroactive tax obligations for the employer.
Fixing Errors on an Issued Certificate
A misspelled name, a wrong Social Security number, or incorrect assignment dates should be fixed promptly. Send a correction request to the Office of Earnings and International Operations, reference the original certificate number, and identify the specific data that needs to change. The agency can issue a corrected version without restarting the application.3Social Security Administration. RS 02001.005 Certificates of Coverage
If the dates on the certificate don’t match the actual assignment, the foreign tax authority can reject the exemption and the employer may end up liable for back taxes and penalties in the host country.
Foreign Workers Coming to the United States
The certificate process works in both directions. A foreign national sent to the United States by an employer in an agreement country can claim exemption from U.S. Social Security and Medicare taxes (FICA) by getting a Certificate of Coverage from the social security agency of their home country and presenting it to the U.S. employer. The IRS outlines this in Revenue Procedures 80-56 and 84-54 and Revenue Ruling 92-9.7Internal Revenue Service. Totalization Agreements Those same procedures provide an alternate way to claim the exemption if the foreign agency is slow or the process is unfamiliar.
When a U.S. employer receives a valid foreign certificate, the employer keeps it on file and stops withholding FICA for that worker. If the IRS questions the missing withholding, the foreign certificate is the employer’s proof.3Social Security Administration. RS 02001.005 Certificates of Coverage
Where to Reach the SSA
For questions about which country’s social security system covers a specific worker, call the SSA’s Office of Data Exchange, Policy Publications, and International Negotiations at (410) 965-7306.8Social Security Administration. General Overview – International Programs For questions about a Certificate of Coverage request specifically, email certificate@ssa.gov or call 1-866-776-4383, Monday through Friday, 8 a.m. to 3 p.m. Eastern Time.5Social Security Administration. International Programs – Certificate of Coverage For benefit inquiries or changes in status while abroad, write to the Office of Earnings and International Operations at P.O. Box 17775, Baltimore, MD 21235-7775.9Social Security Administration. Service Around the World – Office of Earnings and International Operations