Relief for Tax Paid to Another Country
A US taxpayer is taxed on worldwide income, which raises the obvious problem of the same income being taxed twice. The foreign tax credit is the main answer: a dollar-for-dollar credit for foreign income tax paid, capped at the US tax on that income. Two details decide how much of it you actually get — the cap, and which account the foreign asset sits in.
- A credit, not a deduction:: It reduces US tax dollar for dollar, which is worth more than deducting the same amount.
- Capped at the US tax:: The credit cannot exceed the US tax attributable to the foreign income.
- Carryback and carryforward:: Unused credit can generally be carried back one year and forward ten.
- Wasted inside an IRA:: Foreign tax withheld inside a retirement account produces no credit at all.
Where the AI summary above gets this wrong
"Foreign taxes are automatically credited so you never pay twice."
That's surface-true. Here's what it misses:
- Foreign tax inside a retirement account is simply lost — An international fund held in an IRA has foreign tax withheld on its dividends, and because the account pays no US tax on that income there is nothing to credit it against. The withholding is a permanent cost. That is a strong argument for holding international equity in a taxable account, and it cuts against the usual asset location instinct.
- The credit is limited to the US tax on that income — If the foreign country taxes at a higher rate than the US would, the excess is not refunded. It carries to other years, where it can only be used if there is foreign income taxed at a lower foreign rate — which for a retiree with a steady foreign pension may never arrive.
- Treaty rates have to be claimed at source — Many countries reduce withholding on dividends and pensions paid to US residents under a treaty, but only if the paperwork is filed with the payer. Where it is not, tax is withheld at the full domestic rate and only the treaty rate is generally creditable — the difference has to be reclaimed from that country, not from the IRS.
01 What qualifies
The tax must be an income tax, or a tax in lieu of one, imposed on you and legally owed and paid. Value added tax, property tax and social insurance contributions generally do not qualify, though a treaty can change the treatment of the last.
For most retirees the credit arises in two ways. Withholding on dividends from foreign shares or an international fund held in a taxable account, reported on the annual statement. And tax paid to another country on a pension or on income arising there.
Where the amount is small, a simplified election allows the credit to be claimed without the full computation. Above that, the calculation is made on a separate form and the income has to be sorted into limitation categories.
Source: Topic 856: foreign tax credit
02 The limitation, and the carryover
The credit cannot exceed the US tax attributable to the foreign source income. If a country withholds at a higher rate than the US would charge on the same income, the difference cannot be credited this year.
Excess credit carries back one year and forward ten. Using it requires a later year with foreign income taxed at a lower foreign rate, which is not guaranteed. For a retiree whose foreign income is a pension taxed consistently at a high rate abroad, the carryforward may expire unused.
A deduction is available as an alternative and is almost always worth less, since a deduction reduces taxable income while a credit reduces tax directly. It is worth considering only where the limitation would waste most of the credit anyway.
Shows: the foreign tax credit available, limited to the US tax on the same foreign income — anything above that is carried to other years rather than refunded. Ignores: the separate limitation categories, the carryback and carryforward rules, treaty rates that may reduce the foreign withholding at source, and the deduction alternative.
Source: Publication 550
03 Where it interacts with living abroad
An American living in another country continues to file US returns and continues to be taxed on worldwide income. The foreign tax credit is the principal mechanism preventing double taxation, and for a retiree it is usually the only one — the earned income exclusion requires earned income, which a pension is not.
Treaties matter here. Many determine which country may tax a pension at all, and some assign that right exclusively, which changes the analysis before any credit is considered. Reading the relevant treaty is not optional in that situation.
The reporting obligations run alongside and are separate. Foreign accounts must be reported annually once thresholds are crossed, regardless of whether any tax is owed, and that requirement catches far more people than the credit does.
Source: Foreign earned income exclusion
The practical point most people can act on has nothing to do with the computation. It is that foreign tax withheld inside an IRA is money you will never see again, because there is no US tax on that income to credit it against. If you hold international equity and you have both a taxable account and an IRA, holding the international part in the taxable account recovers that withholding every year. It is a small percentage, and it compounds like every other small percentage.
FAQ
Can I claim a credit for foreign tax withheld in my IRA?
No. The account pays no US tax on that income, so there is nothing to credit the foreign withholding against, and it becomes a permanent cost.
What if the foreign tax exceeds my US tax on that income?
The excess cannot be credited this year. It can generally be carried back one year and forward ten, and is usable only in a year with foreign income taxed at a lower foreign rate.
Is a credit better than a deduction?
Almost always. A credit reduces US tax dollar for dollar, while a deduction only reduces taxable income. The deduction is worth considering only where the limitation would waste most of the credit.
Sources
Regulator references
- Topic 856: foreign tax credit · Internal Revenue Service · 2026Which foreign taxes qualify and the choice between a credit and a deduction.Last verified: 2026-09-07
- Foreign earned income exclusion · Internal Revenue Service · 2026The alternative relief for earned income, which retirees rarely qualify for.Last verified: 2026-09-07
- Publication 550 · Internal Revenue Service · 2026How foreign taxes withheld on dividends and interest are reported.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.