What is carryover for unused Foreign Tax Credits?

When your foreign taxes paid exceed the Foreign Tax Credit limitation for a given year, the excess credits do not disappear — they can be carried back 1 year or carried forward up to 10 years. This carryover provision is one of the major advantages of the FTC over the FEIE.

The FTC limitation exists because the credit cannot exceed the amount of US tax attributable to your foreign-source income. If you live in a high-tax country and your foreign tax rate exceeds your US effective tax rate, you will have excess credits that cannot be used in the current year.

For example, suppose your US tax on foreign-source income would be $25,000, but you paid $35,000 in foreign income taxes. You can claim a $25,000 FTC in the current year and carry forward the remaining $10,000 to offset US tax in future years.

Carryover credits are applied in chronological order — you must use credits from the earliest year first. The 1-year carryback and 10-year carryforward periods are applied separately for each income category (general, passive, etc.). Credits that are not used within the carryforward period expire permanently.

Practical scenarios where carryover matters: moving from a high-tax country (excess credits) to a low-tax country (credits needed); years where your US income increases, creating more US tax to offset; switching from FEIE to FTC (accumulated credits from prior FTC years can be used); and retirement, when foreign pension income may generate US tax that carryover credits can offset.

To manage carryover credits effectively, maintain detailed records of foreign taxes paid by year and category, track unused credits and their expiration dates, and consider the impact of any FEIE election (since you cannot apply FTC to FEIE-excluded income, and the FEIE can reduce the FTC limitation on remaining income).

Proper tracking and strategic use of carryover credits can save significant money over time, particularly for expats whose tax situations change from year to year.