US Foreign Tax Credit
Published on March 31, 2026
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Table of Contents
What is the US foreign tax credit?
The US foreign tax credit lets you reduce your US tax by claiming a credit for income taxes you already paid to another country. It helps prevent double taxation, but it only applies to foreign-source income and is subject to specific IRS limits.
If you’re living abroad, this is one of the main tools that keeps your tax situation manageable. Without it, you’d often be paying tax twice on the same earnings.
How the foreign tax credit works
The foreign tax credit reduces your US tax based on foreign taxes you’ve already paid, but only up to a calculated limit. You get relief from double taxation, but you can’t use foreign taxes to wipe out US tax on income earned in the US.
For example, if you live in the UK and pay UK income tax on your salary, the US allows you to offset that tax against what you owe in the US. However, the relief applies only to that same foreign income, not to everything on your return.
Who qualifies for the foreign tax credit?
You can generally claim the foreign tax credit if you paid or accrued foreign income taxes that meet IRS requirements.
The IRS looks at four things:
- The tax must be imposed on you
- You must have paid or accrued it
- It must be your legal and actual liability
- It must be an income tax (or a tax in lieu of income tax)
For most US expats, this applies quite naturally. If you’re employed abroad, running a business, or earning investment income outside the US, you’re likely paying foreign income tax already.
Need help using the Foreign Tax Credit on US taxes? Reach out today.
What taxes qualify for the foreign tax credit
Only foreign income taxes or taxes imposed in lieu of an income tax generally qualify for the credit.
Here’s a clearer breakdown:
|
Qualifying taxes |
Non-qualifying taxes |
|
Foreign income tax |
VAT or sales tax |
|
Withholding tax on dividends or wages |
Property tax |
|
Tax in lieu of income tax |
Social security taxes (in most cases) |
If you’ve ever looked at a foreign tax bill and assumed everything counts, you’re not alone. Many expats overestimate what can be claimed here.
What is the foreign tax credit limitation?
The foreign tax credit is limited to the portion of your US tax attributable to your foreign-source income. In simple terms, you cannot use foreign taxes to reduce US tax on US income.
Formula (simplified):
FTC limit = (foreign-source taxable income ÷ total taxable income) × US tax before credits
How to read this:
- The calculation is based on taxable income, not gross income
- It is applied separately for each income category (or “basket”)
- The US tax used is your pre-credit tax liability
Note: The FTC limit is based on foreign-source taxable income within a specific income category, compared to your total taxable income. It is not based on gross income.
For example, if 70% of your income is foreign-source, then only 70% of your US tax can be offset using the foreign tax credit. If you paid more foreign tax than this limit, the excess is not lost, but it cannot be used in the current year.
How to calculate the foreign tax credit (step-by-step)
Step 1: Identify your foreign-source income
Start by separating income earned outside the US. This can include salary for services performed abroad, interest from a foreign payer, dividends from a foreign corporation, and certain other foreign-source investment income.
Step 2: Calculate your total taxable income
Add up your worldwide taxable income after applying any adjustments and deductions. This figure is used to compare your foreign-source taxable income against your total taxable income for FTC purposes.
Step 3: Determine foreign taxes paid or accrued
Identify how much foreign income tax you actually paid (or accrued, depending on your method).
Step 4: Apply the FTC limitation formula
Calculate the portion of your US tax attributable to your foreign-source taxable income within each income category using the FTC limitation formula.
Step 5: Compare allowable credit versus actual foreign taxes
You can only claim the lower of:
- The FTC limit
- The foreign taxes you paid
Here’s a simplified example (for illustration only):
- Foreign income: US$80,000
- Total income: US$100,000
- US tax liability (before credits): US$20,000
Your FTC limit would be 80% of US$20,000, which is US$16,000.
If you paid US$18,000 in foreign taxes, you can only claim US$16,000 this year. The remaining US$2,000 is not lost, but may be carried to another tax year under IRS carryover rules.
When do you need to file Form 1116?
You generally need to file Form 1116 if your foreign taxes exceed US$300 (US$600 for joint filers), or if your situation does not qualify for the IRS’s limited exception for passive income.
Here’s a quick way to think about it:
|
Situation |
Form 1116 required |
|
Small passive income with low foreign tax |
No |
|
Foreign taxes above threshold |
Yes |
|
Multiple income categories |
Yes |
|
Self-employment or business income abroad |
Yes |
A lot of expats hope they can skip this form, but once your situation becomes even slightly complex, it’s almost unavoidable. And once you’re filing it, you’ll run into something called income categories.
Note: You may be able to claim the foreign tax credit without filing Form 1116, but only in a very limited situation. To qualify, all of the following must apply:
- Your foreign income is passive income only (such as interest or dividends)
- Your total foreign taxes are US$300 or less (US$600 if married filing jointly)
- The income and taxes are reported on standard payee statements (such as Form 1099)
- You choose to claim the credit without filing Form 1116
If any of these conditions are not met, you will generally need to file Form 1116.
Foreign income categories (FTC baskets)
The IRS requires you to separate foreign income into categories, often referred to as “baskets,” when calculating the credit.
|
Category |
Examples |
|
Passive income |
Interest, dividends |
|
General income |
Salary, freelance work |
|
Foreign branch income |
Business profits abroad |
|
Section 951A income |
Certain corporate earnings |
Each category has its own limitation calculation. You can’t mix them together to increase your credit.
This is one of those rules that feels overly technical at first. But in practice, it prevents people from offsetting high-tax income against low-tax income in ways the IRS doesn’t allow.
Carryback and carryforward rules
If your foreign tax credit exceeds the allowed limit, you don’t lose it.
You can generally:
- Carry it back 1 year
- Carry it forward up to 10 years
This is particularly useful if you move between countries or your income changes over time.
For example, someone working in a high-tax country one year and a lower-tax country later might end up using those excess credits down the line.
However, unused foreign tax credits must be tracked separately for each income category and cannot be combined across categories.
Foreign Tax Credit (FTC) vs Foreign Earned Income Exclusion (FEIE)
The foreign tax credit and the foreign earned income exclusion both reduce US tax, but they work in completely different ways.
FTC vs FEIE: which is better for expats?
|
Feature |
Foreign tax credit |
Foreign earned income exclusion |
|
Based on foreign taxes paid |
Yes |
No |
|
Reduces US tax directly |
Yes |
Indirectly |
|
Income limit |
No |
Yes |
|
Best for high-tax countries |
Yes |
Limited |
The key limitation is that you can’t use both on the same income.
In many high-tax countries, the FTC is often more effective than the FEIE, though the better choice depends on your income mix, local tax burden, and long-term planning.
When the foreign tax credit may not help
The foreign tax credit doesn’t solve every situation.
|
Situation |
FTC effectiveness |
|
High-tax country |
Strong |
|
Low-tax country |
Limited |
|
No foreign tax paid |
None |
|
Income already excluded |
Reduced |
If you’re living somewhere with little or no income tax, the FTC won’t provide much benefit. That’s where other strategies come into play.
Important! Even when the FTC works well, it does not eliminate your US reporting requirements.
Real-life example: How the FTC works for a US expat
- Salary: US$100,000
- Australian tax paid: US$30,000
When you prepare your US return, you first calculate your US tax liability. Then you apply the foreign tax credit based on the portion of your income that qualifies as foreign-source income.
If your US tax on that income is lower than US$30,000, the FTC can reduce your US tax to zero. Any excess may carry forward.
In many cases, this is why expats in higher-tax countries don’t end up paying additional US tax. They still file, but the credit does most of the heavy lifting.
Key IRS forms and reporting requirements
To claim the foreign tax credit properly, you’ll typically deal with:
- Form 1116
- Form 1040
- Form 2555 (if you’re also considering the exclusion)
- Foreign tax statements or withholding records
Even if your final US tax bill is low or zero, the reporting requirements don’t go away. That’s something many expats underestimate early on.
Filing the right forms is only part of the process. There are also a few lesser-known IRS rules that can affect how much credit you can actually use.
Additional IRS rules and updates expats should know
The foreign tax credit works well in most situations, but a few lesser-known IRS rules can affect how you claim it and how much you can use.
1. You can choose between a credit or a deduction
The IRS allows you to either claim foreign taxes as a credit or as an itemized deduction.
- The credit reduces your US tax directly
- A deduction only reduces your taxable income
In most cases, the credit provides a better outcome because it reduces your tax bill dollar-for-dollar. Still, there are situations where a deduction may make sense, especially if you cannot fully use the credit due to limitation rules.
2. Foreign tax refunds and adjustments may require updates
If a foreign country later refunds or adjusts your taxes, your original foreign tax credit may no longer be accurate.
For the 2025 tax year (filed in 2026), the IRS continues to require reporting of these changes. In some cases, you may need to:
- Adjust your current-year reporting or
- Amend a prior US tax return
In some cases, you may need to report foreign tax adjustments using Schedule C of Form 1116, which applies to foreign tax redeterminations. Even small changes can affect how much credit you’re allowed to claim.
3. Investment income can involve additional rules
Foreign taxes on dividends, interest, and capital gains can qualify for the foreign tax credit, but the calculation is not always straightforward.
In particular:
- Some investment income is taxed at different rates in the US
- Special adjustments may be required when calculating the allowable credit
- Income sourcing rules can vary depending on the type of investment
In simpler cases, this doesn’t create issues. However, once portfolios become more complex, the calculation can change in ways that are not immediately clear without detailed review.
FAQs
-
Can I claim both the foreign tax credit and the foreign earned income exclusion?
Yes, but not on the same income. You can use both in a single return if they apply to different types of income. In practice, this requires careful allocation, and mistakes here are more common than you’d think.
-
What happens if my foreign taxes are higher than my US taxes?
-
Do I still need to file a US tax return if the FTC reduces my tax to zero?
-
Can I claim the foreign tax credit if I haven’t paid the tax yet?
-
Are foreign tax refunds or adjustments reported later?
-
What’s the biggest mistake expats make with the FTC?
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