Foreign Tax Credit and Form 1116: A Guide for US Expats

Foreign Tax Credit Limitation: How the Calculation Works

The credit is limited by both the qualifying foreign tax available and the US tax attributable to foreign-source taxable income. Calculate the limitation separately for the applicable income category, using the adjustments in the instructions for the tax year involved.

Basic limitation: applicable US income tax × (foreign-source taxable income in the category ÷ worldwide taxable income). This is an overview of the calculation, not a substitute for Form 1116's detailed adjustments.

Income sourcing and deduction allocation matter. A larger worldwide-income denominator does not, by itself, increase the fraction. Adding US-source income can change the US tax calculation as well, so recalculate the whole limitation rather than assuming it improves the credit.

For tax year 2026, the basic standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly, where eligible. Use the applicable-year deduction and allocation instructions; neither amount is a direct reduction of foreign tax paid.

See the IRS explanation of the Foreign Tax Credit limit and official 2026 tax adjustments.

Worked Example: A Credit Limit, Not a Promised Tax Outcome

This hypothetical example shows the arithmetic for one income category. It is not a client result or a calculation of another country's tax.

• Assume the applicable pre-credit US income tax is $20,000 and the properly adjusted foreign-source taxable-income share for one category is 80%.
• The simplified limitation is $20,000 × 80% = $16,000.
• If $30,000 of qualifying foreign tax is available in that category, the current credit is limited to $16,000 in this illustration.
• The remaining $14,000 of foreign tax is not an automatic refund. Review the category's carryback and carryover rules and available limitation in the relevant years before treating it as usable.

Actual sourcing, deduction allocations, other credits, tax-rate adjustments and treaty provisions can change the result. This illustration does not calculate a complete return or show that all US taxes disappear.

Source: IRS: figuring the credit and its limit.

Unused Foreign Taxes: Category and Year Matter

Unused qualifying foreign taxes generally go first to the preceding year and then to the next ten years, subject to available limitation. Work within the same income category. Salary-category credits do not automatically offset later passive-income tax after a move to the United States.

The section 951A category does not receive this carryback/carryover treatment. Review the applicable tax-year rules and exceptions, including years using the election to claim a credit without Form 1116.

Use Schedule B (Form 1116) to reconcile carryovers and retain a year-by-year, category-by-category record of amounts generated, absorbed and remaining. A carryback refund depends on an actual prior-year overpayment and applicable filing requirements; it is not guaranteed by having paid some US tax. See Publication 514's carryback and carryover rules.

Choosing Between the Foreign Tax Credit and FEIE

Compare the eligible treatments using your income, qualifying foreign taxes and election history. A country's headline tax rate does not establish your US result.

• Check exclusion eligibility first: the FEIE requires qualifying foreign earned income, a foreign tax home and an applicable residence or physical-presence test. Living abroad alone is not enough.
• Separate excluded income: foreign taxes attributable to income excluded under the FEIE or foreign housing exclusion cannot also generate a credit. Claiming such a credit may revoke an exclusion election.
• Check other tax exposure: the FEIE does not reduce self-employment tax, and non-excluded income is taxed using the rates that would apply without the exclusion.

Review prior elections before switching. Revocation requires a statement identifying the choice being revoked. Re-electing the same exclusion within five tax years requires IRS approval; the rule is not an irreversible ban.

Sources: IRS FEIE eligibility and tax calculation, credit restrictions for excluded income and exclusion revocation rules.

How to Prepare Form 1116

The IRS instructions retrieved on September 24, 2026 are for tax year 2025. Use the form and instructions for the year you are filing; this overview does not label those instructions as a final 2026 form.

1. Classify income: identify each applicable category by its name and prepare separate forms where required.
2. Part I: report foreign-source income and allocate the relevant deductions, applying required income adjustments.
3. Part II: report taxes under the applicable paid-or-accrued method and currency-conversion rules.
4. Part III: calculate the credit using eligible taxes, adjustments, applicable carryovers and the category's limitation.
5. Part IV: summarize the credits as instructed, including when only one form is filed under the 2025 instructions. Carryover reconciliation belongs on Schedule B where required.

Follow the IRS Form 1116 instructions for line entries, exceptions and the transfer to your income-tax return.

When You May Claim the Credit Without Form 1116

The amount threshold alone is not enough. The IRS describes an election when all foreign-source gross income is qualifying passive income, the foreign income and taxes appear on payee statements, and qualified foreign taxes do not exceed $300, or $600 on a joint return. The taxpayer must elect this treatment.

You cannot carry unused foreign tax into or out of a year using this election. Other credit-qualification rules still apply. Check the IRS election requirements and the instructions for the return year before omitting Form 1116.

Checks Before Filing Form 1116

• Qualifying taxes: check the levy and final liability. Do not treat every foreign payroll charge as creditable, or automatically reject French CSG/CRDS; see the IRS credit guidance.
• Income source: where services occur generally matters more than the employer's address. Review the IRS sourcing rules for mixed-country work.
• Excluded income: remove taxes attributable to income excluded under Form 2555.
• Calculations: check categories, allocated deductions, exchange rates and treaty provisions.
• Records: reconcile carryovers using Schedule B where required, and review later foreign refunds or reassessments for US reporting consequences.

Use the Form 1116 instructions for the return year. A high foreign tax payment alone does not establish the allowable credit.

Is the Foreign Tax Credit Refundable?

The credit is limited: the IRS does not pay you the unused difference merely because foreign tax exceeds the credit available on your US return.

Unused qualifying taxes may be available in another year under the carryback and carryover rules. Using them depends on the same-category limitation and applicable exceptions; moving back to the United States does not guarantee their use. A prior-year refund requires an actual overpayment after the permitted carryback and a valid refund claim.

See the IRS credit-limit explanation and Publication 514 carryback and carryover rules. Keep the unused-tax schedule separate from any calculation of tax payments and refunds.

Foreign Tax Credit and the Alternative Minimum Tax (AMT)

The AMT foreign tax credit uses AMT amounts. A regular-tax credit does not by itself establish that no AMT is due.

The Form 6251 instructions retrieved on September 24, 2026 are for tax year 2025. They explain when an AMT credit calculation is needed and how to prepare separate AMT Forms 1116 by category. They also provide simplified-election rules and an exception for taxpayers who elected to claim the regular credit without Form 1116. Use the instructions for the return year.

For tax year 2026, the exemption is $90,100 for a single filer and $140,200 for married filing jointly. The respective phaseouts begin at $500,000 and $1,000,000, according to the IRS 2026 inflation announcement.

Checking Taxes Paid in Your Country

Whether you file in the UK, Canada, Germany, Australia or elsewhere, a local tax rate does not establish your US credit. Start with the assessment and identify each levy separately.

For Canadian tax slips, assessments and treaty considerations, see our guide to claiming US foreign tax credits for Canadian taxes.

• Who owes the tax? Establish your legal liability; do not assume a pension fund's or company's tax is imposed on you.
• What kind of levy is it? Income-tax qualification is separate from a local payroll label. Provincial or local income taxes can qualify, subject to the other requirements.
• What is the final amount? Account for refunds and treaty-rate entitlements rather than crediting all withholding automatically.
• Is retirement income involved? Check the payment type, relevant treaty articles, amendments and saving-clause exceptions.

Sources: IRS qualifying-tax requirements and foreign pension and annuity guidance. Apply these checks to the actual tax and return year.

FTC vs FEIE: A Side-by-Side Comparison

Sources: IRS credit overview, FEIE rules, 2026 exclusion maximum and revocation guidance. Compare complete calculations before choosing a treatment.

Frequently Asked Questions

Can I claim both the FTC and the FEIE?

You may use both when eligible, but foreign taxes attributable to income excluded under the FEIE or foreign housing exclusion cannot also generate a credit. Non-excluded income still requires its own source, category and credit-limit analysis.

What if I paid more in foreign taxes than I owe in US taxes?

Unused qualifying foreign taxes generally go first to the preceding year and then to the next ten years, subject to category limits and exceptions. The section 951A category has no such carryover. Excess foreign taxes do not automatically produce a refund.

Do I use the exchange rate on the date I paid the tax?

For taxes credited when paid, generally use the payment or withholding date rate. Accrued taxes generally use the average rate for the relevant tax year, with exceptions for timing, inflationary currencies and applicable elections. Check the Form 1116 conversion instructions and document the rate calculation; an annual average is not universally appropriate. See the IRS currency-conversion instructions.

Can I take a deduction instead of a credit for foreign taxes?

Qualified foreign income taxes can generally be claimed as a credit or an itemized deduction. Compare both calculations; the choice ordinarily applies to all qualified foreign taxes for that year. A deduction reduces taxable income, while an allowable credit reduces tax.

What happens to my FTC carryforwards if I move back to the US?

Moving back does not restart the carryover period or guarantee use. Retain the original year and category records, and check available limitation in each eligible year. Unused salary-category taxes do not automatically offset investment-income tax.

Is UK National Insurance creditable as a Foreign Tax Credit?

UK social-security contributions are not eligible for this income-tax credit. Social-security coverage is a separate question under the US–UK agreement; check the applicable coverage rules and obtain a certificate when claiming an exemption.

Can self-employed expats use the FTC to reduce self-employment tax?

The Foreign Tax Credit does not reduce self-employment tax. A social-security agreement may instead provide an exemption from dual coverage, depending on its rules and your circumstances. Paying into a foreign system alone does not establish the exemption.

How does the FTC work with GILTI for expat business owners?

Company-level foreign taxes are not automatically personal Form 1116 credits. A section 962 election may permit certain credits through applicable Forms 1118 and a section 250 deduction, subject to the relevant requirements. For 2026, check the statutory transition to net CFC tested income and the applicable shareholder and company tax years; do not reuse an older GILTI credit percentage without checking those rules. See Publication 514, Form 8993 instructions and IRS Bulletin 2026-39.

Is the Foreign Tax Credit refundable?

The IRS does not refund unused foreign tax merely because it exceeds your available credit. Carryback or carryover relief depends on the applicable rules and credit limit. A carryback refund requires a prior-year overpayment and a valid claim.

What is the foreign tax credit limitation and how is it calculated?

The limit generally caps the credit at the US tax attributable to foreign-source taxable income, calculated separately by category. Required adjustments, qualified-tax amounts and applicable exceptions also matter. The limitation example above is hypothetical, not a prediction of your tax bill.

How do I carry back Foreign Tax Credits to a prior year?

For an eligible carryback, file Form 1040-X for the preceding year with a revised Form 1116. Recalculate that category’s limit and follow the applicable schedule and refund-claim requirements. Neither a refund nor a processing date is guaranteed.

What is the $300/$600 de minimis election for the Foreign Tax Credit?

This election requires all foreign-source gross income to be qualifying passive income reported with the taxes on payee statements, qualified foreign taxes no greater than $300 ($600 jointly), and an election. Other credit rules still apply; no unused foreign tax may be carried into or out of that election year.

Does the Foreign Tax Credit affect the Alternative Minimum Tax?

Yes. The AMT foreign tax credit uses AMT amounts and may require a separate calculation. Check the applicable Form 6251 instructions, including exceptions and simplified-election rules; the regular credit does not establish that AMT is zero.

Can I claim the Foreign Tax Credit on Form 1116 for foreign taxes on investment income?

Qualifying foreign taxes on investment income may be creditable. Determine the income source and category, any treaty-rate limit and applicable adjustments. Passive-category treatment is common but has exceptions; a foreign account or investment label alone does not establish a credit.