The most-missed tax bill for U.S. expat freelancers: the 15.3% self-employment tax. FEIE does NOT reduce it. This tool tells you what you owe — and whether a totalization agreement exempts you.
Enter your net SE income and country. The calculator handles the FEIE-does-not-apply rule and the totalization-agreement exemption.
Gross self-employment revenue minus deductible business expenses. SE tax applies to 92.35% of this amount (the IRS allows you to deduct half of SE tax before computing SE tax — net effect: SE tax base is 92.35% of net SE earnings).
The U.S. has totalization agreements with ~30 countries. They prevent double Social Security taxation — if you pay into the host country’s system, you get a Certificate of Coverage and are exempted from U.S. SE tax (the 12.4% Social Security portion; some agreements also exempt the 2.9% Medicare). See the SSA totalization agreements page.
A Certificate of Coverage (CoC) from the host country’s social-security authority is required to actually claim the totalization exemption. Without it, you owe U.S. SE tax in full even if a totalization agreement exists. Apply through the host country’s social-security office.
This is the single most-missed expat tax surprise. Self-employed U.S. expats often use FEIE to exclude their foreign earned income from U.S. federal income tax — and then discover at filing time that they still owe 15.3% self-employment tax on every dollar of net SE earnings, because FEIE only excludes income from income tax, not from SE tax.
This is statutory: 26 U.S.C. § 1402 defines self-employment income for SE-tax purposes WITHOUT reference to FEIE. The IRS confirms this on Form 2555 (line 45) and in Pub. 54. A $100K freelancer abroad who uses FEIE pays $0 federal income tax — and roughly $14,130 in SE tax.
The U.S. has totalization agreements with ~30 countries that prevent double Social Security taxation. If you live and work in a totalization-agreement country and actively pay into that country’s social-security system, you can apply for a Certificate of Coverage (CoC) from the host country’s social-security authority. The CoC exempts you from the U.S. Social Security portion of SE tax (the 12.4% piece).
Whether the CoC also exempts the 2.9% Medicare portion varies by agreement. Most agreements exempt both. A few exempt only Social Security. Check the specific agreement on the SSA totalization agreements page.
If you owe SE tax abroad, you generally must pay U.S. estimated taxes quarterly (April 15, June 15, September 15, January 15 of the following year), because there’s no employer to withhold. Underpayment triggers the IRC § 6654 penalty plus interest. Use Form 1040-ES to figure quarterly payments, or have your tax software project them automatically.
One bit of relief: you deduct half of your SE tax as an “above-the-line” adjustment when computing income tax. For a $14,130 SE tax, that’s a $7,065 income-tax deduction — modestly offsetting the bill. The calculator above assumes the standard half-SE-tax deduction in the income-tax part of the math, not in the SE tax itself (which is calculated against 92.35% of net earnings, the IRS’s built-in version of the same adjustment).