Foreign Tax Credit: How It Works, Who Qualifies and When You Need Form 1116

The foreign tax credit lets you subtract foreign income tax you paid from your US tax, so the same income isn’t fully taxed twice. US citizens and resident aliens can generally claim it, usually on Form 1116. It’s capped at the US tax on your foreign income, and any excess can generally carry back 1 year and forward 10.

What is the foreign tax credit and who can claim it?

It’s a dollar-based reduction of your US tax for income tax you paid to another country or a US territory. IRS Publication 514 says US citizens, resident aliens and nonresident aliens who paid foreign income tax and owe US tax on foreign-source income may be able to take it. Citizens are taxed on worldwide income wherever they live, so this is a main form of relief for Americans abroad.

The tax itself has to qualify. Publication 514 sets four tests.

• It has to be imposed on you, you must have paid or accrued it, and it has to be your legal and actual liability.
• It has to be an income tax or a tax in lieu of one. Foreign property tax doesn’t qualify.
• Tax paid to a foreign province or city can count, so provincial tax isn’t shut out for being below the national level.

The credit itself comes from IRC 901, and it’s subject to the limit in section 904.

When don’t you need Form 1116?

You can skip the form when you meet the election in the Form 1116 instructions. All your foreign income has to be passive, such as most interest and dividends. All of it has to be reported on a qualified payee statement like a Form 1099-DIV. And your creditable foreign tax can’t be more than $300, or $600 on a joint return.

Those amounts are $300 and $600 in the 2025 instructions and in the draft 2026 instructions, which aren’t final yet. In exchange, nothing carries to or from that year.

• The limit doesn’t apply to that year, and the tax still has to meet the creditability rules.
• Estates and trusts can’t use the election.
• Canadian salary tax won’t fit, because wages aren’t passive income.

The typical user is someone with a fund in a taxable account that shows a little foreign tax on the 1099.

Should you take the credit, the deduction or the FEIE?

Between the credit and the deduction, it’s usually the credit, and the IRS says so: Publication 514 notes that in most cases the credit is to your advantage. A credit reduces your tax, while a deduction only reduces the income the tax is figured on. The foreign earned income exclusion is a different tool, and that IRS line doesn’t rank it. It doesn’t depend on any foreign tax being paid, so it can do more where foreign tax is low. The answer turns on your income and your country.

	Foreign tax credit	Itemized deduction	Foreign earned income exclusion
What it reduces	Your US tax	Your taxable income	Your income, by excluding it
Income it covers	Any qualifying foreign income, by category	Qualified foreign taxes for the year	Foreign earned income only, up to $132,900 for 2026 or $130,000 for 2025
Form	Form 1116, unless the election applies	Schedule A	Form 2555
Unused amount	Carries back 1 year and forward 10	No carryover	Tax on excluded income can’t be credited
Time to change your choice	Into the credit: 10-year window	Into the deduction: 3-year window	Covered in the guides below

You pick for the whole year: Publication 514 treats all your qualified foreign taxes for a year as going one way, though you can choose again next year. The Form 1116 instructions give you 10 years to switch to the credit and 3 to switch to the deduction, or 2 from paying the tax if that’s later.

You can’t stack the exclusion and the credit on the same income. IRC 911(d)(6) denies the double benefit, though you can still claim a credit on income you didn’t exclude. If that’s your decision, read FEIE vs foreign tax credit in Canada or the wider exclusion vs credit guide for citizens abroad.

How does the foreign tax credit limit work?

Your credit can’t exceed the US tax on your foreign income. IRC 904(a) gets there with a fraction: US tax times foreign-source taxable income, divided by total taxable income. If your foreign tax is at or below that number, you can generally use it all. If it’s higher, the excess waits for another year and can’t touch tax on US income.

You run that fraction separately for each of the four categories, or baskets, in section 904(d), and excess in one doesn’t cover US tax in another.

• General. Most wages and business income for most people. This is the catch-all.
• Passive. Most interest and dividends, along with other investment income. Income taxed above the top US rate generally moves to general under the high-tax rule.
• Foreign branch. Business profits from a qualified business unit in another country. That can catch a self-employed person whose foreign business keeps its own books.
• Section 951A. Owners of controlled foreign corporations, and the only basket with no carryover.

The Form 1116 instructions also track section 901(j) income, income re-sourced by treaty, and lump-sum distributions on their own forms.

P.L. 119-21 touches this mainly for owners of foreign corporations. For controlled foreign corporation years beginning in 2026, the inclusion is called net CFC tested income, replacing GILTI, though the draft 2026 form still calls the basket section 951A. For years beginning after 2025, section 960(d) raises the deemed-paid rate for domestic corporations from 80% to 90%, and an individual owner reaches that credit only through a section 962 election. Section 904(b)(5) adds an expense allocation rule for that basket, and section 904(b)(6) adds a sourcing rule for US-made inventory sold through a foreign office.

Section 960(d)(4) hits individual owners directly. It denies a credit for 10% of foreign tax paid on a distribution of section 951A earnings you already included, where the inclusion came after June 28, 2025. If you own one of these companies, start with our CFC guide.

The law reaches ordinary filers too. The enhanced senior deduction gets added back to taxable income when you figure the limit, starting with 2025 returns. For 2026, the draft instructions add that if the new itemized deduction limit applies to you, you reduce each itemized deduction before using it on Form 1116.

The Form 1116 limitation guide goes deeper on why the credit often isn’t dollar for dollar. Our limitation and carryover guide has more on the fraction.

What happens to foreign tax you can’t use this year?

It generally carries back 1 year and then forward 10, within the same category. IRC 904(c) sets the order: the prior year first, then each later year, earliest first. It only sticks where a year has unused limit, and the period doesn’t stretch if you couldn’t use the credit in a year along the way. After that it’s gone.

• A carried amount only works as a credit. You can’t carry a credit back to a year you deducted, and the instructions reduce the carry by what you’d have used that year.
• To use a carryback, you file Form 1040-X or another amended return with a revised Form 1116 for the earlier year.
• Schedule B (Form 1116) reconciles your carryover each year.
• Section 951A category tax doesn’t carry at all.

The carryforward and carryback guide has the mechanics.

How does Canadian tax work as a foreign tax credit?

Canadian federal income tax generally qualifies, and provincial income tax is treated the same way under the rule for foreign provinces. Article XXIV of the Canada-US treaty also commits the US, subject to the limits of US law, to allow a credit to its citizens and residents for income tax paid to Canada, using the same proportion idea as the US limit. If Canadian tax on an item runs above the US tax on it, excess credits are a normal result.

• Baskets. Wages generally land in the general basket, and investment income in passive unless it’s high-taxed.
• CPP and QPP. Publication 514 allows no credit or deduction for social security taxes paid to a country with a US social security agreement, and Canada’s agreement covers the Canada Pension Plan and the Quebec Pension Plan. Those contributions generally don’t count.

Our guide to US tax for Americans living in Canada covers the rest of that return.

Treaty re-sourcing is limited for US citizens living in Canada. Publication 514 lists Canada among the treaties whose special rules generally limit how much US-source income gets treated as foreign source, and it points to a worksheet for the additional credit those rules allow. Under the Form 1116 instructions, if a treaty sourcing rule treats US-source income as foreign-source and you elect to apply it, that income counts as foreign source. You generally need a separate Form 1116 for each re-sourced amount, and you may need Form 8833. There’s an exception to the separate-form rule for income re-sourced by relief rules that apply only to US citizens living in the treaty country. Publication 514 also says you don’t have to file Form 8833 for the additional credit under those limited re-sourcing rules. Article XXIV’s first paragraph is expressly subject to paragraphs 4, 5 and 6, so whether an item qualifies turns on the treaty text and your facts.

If Canadian tax changes after you file, because of a reassessment or a refund, the instructions generally call for an amended return with a revised Form 1116 when your US tax changes, plus Schedule C (Form 1116) with your current return. The Form 1116 guide covers what that does to your credit.

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.