Double Taxation: Will You Pay Tax Twice as a U.S. Expat?

Paying income tax abroad doesn’t automatically mean you’ll pay U.S. tax on the same income. But it doesn’t get you out of filing a U.S. return, either. The Foreign Tax Credit, the Foreign Earned Income Exclusion, and tax treaties can all help, depending on what you earn and where it’s taxed.

At Bright!Tax, we start with a practical question: Which country taxed which income? The answer for your paycheck might be different from the answer for your pension or rental property. Here’s how we sort it out.

What is double taxation?

Double taxation is what happens when the same income is taxed twice. Say you live and work in Spain. Spain taxes your salary, and the U.S. also includes it when it works out your federal income tax. Before you claim any relief, both countries have a claim on the same paycheck.

Why does the U.S. get a look at a paycheck earned in Spain? Under U.S. citizenship-based taxation, U.S. citizens and resident aliens are generally subject to federal income tax on their worldwide income. That includes money you never bring into the United States.

There are two kinds of double taxation worth telling apart:

Type	What it means	What it looks like
Juridical double taxation	Two countries tax the same person on the same income	Spain and the U.S. both tax your salary
Economic double taxation	The same earnings are taxed in the hands of two different taxpayers	A company pays tax on its profits, then you pay tax on the dividends it distributes

That distinction matters. The tax a company pays isn’t necessarily yours to claim as a credit. And your U.S. federal return doesn’t settle a separate state tax bill. If you still meet a state’s residency rules or earn income sourced there, check what that state taxes and what relief it offers.

How small businesses get caught in the double tax net

Your business has one name, one bank account, and one set of books. That doesn’t mean two countries see it as the same kind of taxpayer.

Business structure	Where the tax can land
Corporation taxed separately from its owners	The company can owe tax on profits, and shareholders can owe tax when they receive dividends
S corporation or partnership	Income generally passes through to the owners for U.S. federal tax, but another country may tax the entity or its owners differently
Sole proprietorship	Business profit goes on your individual return and can also be subject to income tax abroad and U.S. self-employment tax
Controlled foreign corporation	Certain U.S. shareholders can owe U.S. tax on company earnings before receiving a dividend

Take Priya, a U.S. citizen who owns a consulting company in the UK. Her company pays UK corporation tax, then pays her a dividend. When we look at Priya’s U.S. return, we don’t put the company’s corporation tax on her personal Form 1116 just because she owns the business. We first check who owed each tax, how the U.S. classifies the company, and whether special rules apply.

Those rules can include Subpart F and U.S. tax on a controlled foreign corporation’s tested income, called net CFC tested income under the revised rules for tax years beginning after 2025 and formerly known as GILTI. The key point for a business owner: leaving money in the company doesn’t necessarily put off the U.S. tax.

Three ways to reduce double taxation

Option	What it does	When we look at it
Foreign Tax Credit (FTC)	Reduces U.S. income tax using eligible foreign income taxes	You’ve paid or accrued foreign income tax on income the U.S. also taxes
Foreign Earned Income Exclusion (FEIE)	Excludes qualifying pay for work abroad, up to the annual limit	You qualify for the exclusion, particularly if you pay little or no foreign income tax
Income tax treaty	Provides relief under specific rules for particular income	You have a pension, withholding, dual residency, or income that both countries treat as locally sourced

1. Claim the Foreign Tax Credit

The Foreign Tax Credit reduces your U.S. income tax bill. Individuals usually work it out on Form 1116.

Two numbers set the credit: your eligible foreign income tax and the U.S. credit limit for that income category. You get the lower of the two. A large foreign tax bill doesn’t give you an unlimited credit against U.S. tax on other income.

Say Daniel works in Germany and has $18,000 of eligible German income tax on his salary. On his U.S. return, the Form 1116 limit for that category is $12,000. With no other amounts affecting the calculation, here’s what happens:

Daniel’s calculation	Amount
Eligible German income tax	$18,000
U.S. credit limit for that category	$12,000
Credit he can use for the year	$12,000
Excess foreign tax to review for carryback or carryforward	$6,000

That last $6,000 isn’t a refund. In categories that allow carryovers, unused eligible foreign taxes can go back one year and then forward up to 10 years, subject to the limits in those years.

The credit can also help with some dividends, interest, and rental income. But the categories matter: extra credit from your salary generally can’t wipe out tax on your investments. And a charge on a foreign tax bill doesn’t qualify just because it says “tax.” Check which foreign taxes the IRS allows, including whether you’re entitled to a refund or a lower rate abroad.

2. Check the Foreign Earned Income Exclusion and housing relief

The Foreign Earned Income Exclusion can be useful when there isn’t much foreign income tax to claim as a credit. It applies to qualifying foreign earned income, including wages and income from services you perform abroad.

To claim it, you need a foreign tax home and must meet either the Bona Fide Residence Test or the Physical Presence Test. You report the income on your U.S. return and claim the exclusion on Form 2555. You don’t leave the income off your return.

Full-year amount	2026	2027
Maximum FEIE per qualifying person	$132,900	$137,300
Standard foreign housing expense cap	$39,870	$41,190
Base housing amount	$21,264	$21,968

The standard housing cap is 30% of the FEIE limit. It caps the expenses that go into the calculation; it isn’t what you get to exclude. You subtract the base housing amount from eligible expenses, and other limits apply. Check IRS guidance for the year and location before using a higher city-specific cap.

For a qualifying employee, the Foreign Housing Exclusion applies to housing costs paid from employer-provided amounts, which can include salary. If you’re self-employed, the Foreign Housing Deduction is the rule to check.

Say Aisha works in Dubai and qualifies for the full year. The FEIE can cover eligible salary, but it won’t cover the interest on her savings. We’d work out the salary exclusion first, then check how the U.S. taxes her interest and whether any eligible foreign tax on it qualifies for a credit.

You can use the FEIE and FTC on the same return, but you can’t claim the credit for foreign tax on income you excluded. And before switching away from an existing FEIE election, check the revocation rules. You need IRS approval to claim the same exclusion again during the next five tax years after revocation.

3. Read the tax treaty for your specific income

A U.S. tax treaty can lower withholding, set rules for taxing a pension, or help settle tax residency when both countries treat you as a resident. But finding your country on the treaty list is only the first step.

Start with the article for the income you receive. Then check the saving clause and its exceptions. In many U.S. treaties, that clause preserves the U.S. right to tax its citizens despite other treaty provisions. Some benefits survive the clause, including relief under double taxation provisions where the treaty provides it.

For example, if both countries tax a pension, we check what kind of pension it is, which country the treaty allows to tax it, and whether the saving clause changes the result for a U.S. citizen. The answer for a private pension doesn’t necessarily apply to a government pension or Social Security.

Use the IRS treaty texts to check the provision itself. Depending on the benefit, you might need to claim a lower rate with the payer, request a refund abroad, or disclose a U.S. treaty position on Form 8833. Not every treaty claim requires that form.

What if both countries charge Social Security tax?

That’s a separate problem from double income taxation. The FEIE doesn’t reduce U.S. self-employment tax, and the ordinary Foreign Tax Credit isn’t a credit against it.

A Social Security totalization agreement can determine which country’s system covers your work and prevent contributions to both systems on the same earnings. Where an agreement applies, a certificate of coverage documents which system covers you. Don’t assume an income tax treaty does that job.

How to keep the two returns straight

Your returns don’t have to show identical figures. A foreign tax year might end in a different month, and the two countries can measure the same income differently. What you need is a record that explains how you got from one set of numbers to the other.

What to keep	What it helps you establish
Payslips, invoices, and investment statements	What you earned, when you earned it, and what type of income it was
Foreign returns, assessments, and payment records	Who owed the foreign tax, how much was paid, and whether it was later adjusted
Travel dates and records of where you worked	Whether you meet an FEIE test and which workdays produced foreign earned income
Exchange rates and conversion records	How you reported the amounts in U.S. dollars
Prior Forms 1116 and 2555	What credits are still available and which elections you’ve already made

For our Bright!Tax clients, we also check whether a difference is just timing. If your foreign assessment arrives after you file in the U.S., don’t assume you’ve lost the credit or can simply put it on next year’s return. The answer depends on whether you claim foreign taxes when paid or accrued and which year the tax belongs to. The IRS explains those rules in Publication 514.

Avoid these double taxation traps

Mistake	What to do instead
Assuming a foreign return replaces your U.S. return	Check U.S. filing requirements separately, even if your federal balance is $0
Claiming a credit for foreign tax on excluded wages	Work out which portion of the foreign tax relates to income still taxable in the U.S.
Picking the FEIE because it covers your whole salary	Compare the full return, including other income, child tax benefits, and prior elections
Treating an income tax treaty as a blanket exemption	Read the article for the income and check the saving clause
Putting foreign corporation tax on your personal return	Confirm who legally owed the tax before claiming it
Assuming the federal result settles state tax	Review your former state’s residency and source-income rules separately

Check what you owe before you file

If you’ve already paid tax abroad, the next step is to see which part of that bill counts on your U.S. return. We can help you compare the credit and exclusion and identify where a treaty, a business interest, or a state filing needs a closer look.

Get started with Bright!Tax for help preparing your U.S. expat return.

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