Foreign Tax Credit (Form 1116): How It Works

If you are a US citizen or resident living abroad, working for an overseas employer, or earning investment income from another country, you have probably paid tax twice on the same dollars. The foreign tax credit exists to fix exactly that problem: it lets you offset the US tax you owe with the income taxes you have already paid to a foreign government, so you are not penalized simply for living or investing across borders.

The foreign tax credit is a dollar-for-dollar reduction of your US tax bill for income taxes paid to a foreign country. US persons claim it on Form 1116, it generally cannot exceed the US tax attributable to that foreign income, and any unused credit can usually be carried back one year or forward ten years.

What the foreign tax credit is

The foreign tax credit (FTC) is a tool in the US tax code designed to prevent double taxation. Because the United States taxes its citizens and green card holders on their worldwide income regardless of where they live, the same income can be taxed once by the country where it is earned and again by the IRS. The FTC reduces your US income tax liability by the amount of qualifying income taxes you paid or accrued to a foreign government during the tax year.

Only income taxes (and certain taxes imposed in lieu of an income tax) qualify. Foreign value-added tax, sales tax, property tax, and most social security-type contributions covered by a totalization agreement do not count. You can read the IRS overview on the Foreign Tax Credit page for the official definition.

Who needs the foreign tax credit

You may benefit from the FTC if you are a US citizen or resident who pays foreign income tax on any of the following:

• Wages or self-employment income earned while living abroad
• Dividends, interest, or capital gains from foreign investments
• Rental income from property located outside the United States
• Pension or retirement distributions sourced to another country

For example, a US citizen living in London who pays UK income tax to HMRC on their salary can claim a credit for that UK tax against their US liability on the same income. The same applies to a US investor receiving dividends from a German company that withheld German tax at source.

Form 1116 basics

Most individuals claim the foreign tax credit by filing Form 1116, Foreign Tax Credit, with their Form 1040. The form asks you to identify the category of income, report the gross foreign income and related deductions, list the foreign taxes paid or accrued, and then calculate the maximum credit allowed under the limitation rules.

There is one helpful exception. If your total creditable foreign taxes are $300 or less ($600 or less for married couples filing jointly), and all of your foreign income is passive income reported on a payee statement such as a 1099, you can claim the credit directly on Schedule 3 without filing Form 1116 at all. The official instructions are available on the IRS Form 1116 page.

Foreign tax credit vs the Foreign Earned Income Exclusion

The FTC is often confused with the Foreign Earned Income Exclusion (FEIE), but they work very differently. The FEIE lets qualifying expats exclude a capped amount of earned income from US tax entirely, while the FTC credits you for taxes actually paid abroad. The FEIE only covers earned income such as wages and self-employment, whereas the FTC can offset tax on passive income like dividends and interest too.

As a rule of thumb, taxpayers in high-tax countries often come out ahead with the FTC, while those in low-tax or no-tax countries may prefer the FEIE. The two can sometimes be combined, but not on the same dollar of income. Because the interaction is technical, it is worth mapping out as part of your broader tax planning rather than choosing one in isolation.

Credit vs deduction: which is better

You generally have a choice between claiming foreign taxes as a credit on Form 1116 or as an itemized deduction on Schedule A. A credit is almost always more valuable because it reduces your tax bill dollar for dollar, whereas a deduction only reduces the income that is subject to tax. A $1,000 credit saves you $1,000; a $1,000 deduction might save you only $220 to $370 depending on your bracket.

You must make the same choice for all foreign taxes in a given year; you cannot credit some and deduct others. For the vast majority of taxpayers the credit wins, but the deduction can occasionally help if your credit would otherwise be heavily limited.

The foreign tax credit limitation and categories of income

The credit is capped. You cannot use foreign taxes to wipe out US tax on US-source income. The limitation formula restricts your credit to the portion of your total US tax that corresponds to your foreign-source taxable income:

FTC limit = US tax liability × (foreign-source taxable income ÷ total taxable income)

Crucially, this limitation is applied separately for each category, or “basket,” of income. The two most common baskets for individuals are the general category (wages, business income, most active income) and the passive category (dividends, interest, rents, royalties, and capital gains). You file a separate Form 1116 for each category. This separation prevents taxpayers from using high taxes paid in one basket to shelter lightly taxed income in another.

Carryover of unused foreign tax credit

If the foreign taxes you paid in a year exceed your limitation, the excess is not lost. Under the carryover rules you can generally carry the unused credit back one year and then forward up to ten years, applying it within the same income category. This is common for expats in high-tax countries, who often build up a carryforward that can offset US tax in a later year, such as a year with a large US-source capital gain or a move back to the United States.

Tracking these carryovers accurately year over year is essential. A neglected carryforward schedule is one of the most common ways taxpayers leave money on the table.

Common situations for US expats and UK residents

For Americans in the UK, the FTC is frequently the strategy of choice because UK income tax rates often exceed comparable US rates, generating surplus credits. A US citizen who is a UK resident paying HMRC on employment income, UK rental profits, or UK investment income will typically use Form 1116 to credit those taxes and frequently carries forward an excess.

Cross-border complications also arise with UK pensions, ISAs (which the US does not treat as tax-free), and the mismatch between the US and UK tax years. The US/UK income tax treaty and the totalization agreement on social security further shape what is creditable. These situations sit squarely within international and expat tax, where treaty positions and sourcing rules can change the outcome significantly.

How to claim the foreign tax credit: step by step

1. Confirm the tax qualifies. Check that it is a foreign income tax (or a tax in lieu of one) that is legally owed and actually paid or accrued.
2. Choose credit or deduction. Compare the value; the credit usually wins.
3. Sort income into categories. Separate general-category income from passive-category income.
4. Convert to US dollars. Use the appropriate exchange rate for the income and the taxes paid.
5. Complete a Form 1116 for each category. Report foreign income, allocable deductions, and foreign taxes.
6. Apply the limitation. Calculate the maximum allowable credit using the formula above.
7. Record any carryover. Note unused credits for the one-year carryback and ten-year carryforward.
8. Carry the total to Schedule 3 and file with your Form 1040.

Mistakes to avoid

• Crediting non-creditable taxes. VAT, sales tax, and property tax do not qualify.
• Mixing income categories. Failing to file a separate Form 1116 per basket leads to incorrect limitations.
• Ignoring carryovers. Not tracking the carryforward schedule wastes excess credits.
• Double-dipping with the FEIE. You cannot claim a credit for taxes on income you already excluded.
• Using the wrong exchange rate or failing to document the basis for foreign income and taxes.
• Crediting taxes you can recover. Refundable foreign taxes or amounts reduced by a treaty are not creditable.

Frequently asked questions

What is the foreign tax credit and how does it help me?

The foreign tax credit is a dollar-for-dollar reduction of your US income tax for income taxes paid to a foreign country. It prevents you from being taxed twice on the same income and is claimed on Form 1116 (or directly on Schedule 3 if you qualify for the de minimis exception).

Can I claim both the FTC and the Foreign Earned Income Exclusion?

You can use both in the same year, but not on the same income. If you exclude wages under the FEIE, you cannot also credit the foreign tax on that excluded portion. Many taxpayers run the numbers both ways before deciding.

What happens to foreign tax credits I cannot use this year?

Excess credits are not lost. You can generally carry them back one year and forward up to ten years, applied within the same category of income. Keep a running carryover schedule each year.

Do I always have to file Form 1116?

Not always. If your creditable foreign taxes are $300 or less ($600 if married filing jointly) and all your foreign income is passive income reported on a payee statement, you can claim the credit without Form 1116.

Is the FTC better for US expats in the UK?

Often, yes. Because UK income tax rates frequently exceed US rates, the credit usually offsets the full US liability and may produce surplus credits to carry forward. The best choice still depends on your full income picture and any treaty positions.

Get cross-border tax help from Tranzesta

The foreign tax credit can save you thousands, but Form 1116, the limitation baskets, and carryover tracking are where mistakes happen, especially for US expats and dual US/UK taxpayers. Our cross-border specialists make sure you claim every credit you are entitled to and stay fully compliant on both sides of the Atlantic. Book a free consultation and let us review your situation.

Disclaimer: This article is for general informational purposes only and does not constitute tax, legal, or financial advice. Tax rules, thresholds, and figures referenced relate to the relevant US tax year and should be confirmed on IRS.gov, as they change over time. Please consult a qualified tax professional about your specific circumstances before acting.