Bitcoin Foreign Tax Credit: Complete §901 Guide for International Bitcoin Holders

The United States taxes its citizens on worldwide income — an unusual practice among developed nations, shared only with Eritrea. A US citizen who sells Bitcoin while living in Germany, Australia, or Portugal still owes US tax on the gain, regardless of how long they've lived abroad and regardless of whether they also paid tax in their country of residence.

This creates a double taxation problem. The Foreign Tax Credit (FTC) under IRC §901 is Congress's solution: a dollar-for-dollar credit against US tax for creditable foreign income taxes paid on the same income. But the FTC is not automatic, not unlimited, and not applicable in every situation. The rules — particularly the FTC limitation formula, the passive income basket, and the sourcing rules for Bitcoin gains — require careful attention.

This guide covers the complete FTC framework for Bitcoin holders: what qualifies as a creditable tax, where Bitcoin gains are sourced, the passive basket mechanics, the Form 1116 limitation calculation, carryback and carryforward rules, the interaction with the Foreign Earned Income Exclusion (FEIE), and a country-by-country overview of how major Bitcoin-holding nations tax cryptocurrency — and how much of that tax translates to a usable US credit.

The §901 Foreign Tax Credit: Basics

IRC §901 allows US taxpayers to claim a credit against their US income tax for foreign income taxes paid or accrued during the year. To qualify, the foreign tax must meet four requirements:

1. A tax: The payment must be a compulsory payment, not a voluntary contribution or user fee
2. To a foreign country or US possession: Paid to a national, state, provincial, or local government of a foreign country
3. On income: The foreign levy must be an income tax in the US sense — a tax on net income, not a transaction tax, VAT, or gross receipts tax
4. The US taxpayer's tax: The taxpayer claiming the credit must be legally liable for and have actually paid or accrued the tax

Most capital gains taxes imposed by developed nations on Bitcoin profits qualify as creditable foreign taxes — they are income taxes on net gains. However, some countries' crypto taxes may be structured as transaction levies or flat gross receipts taxes that do not qualify as income taxes in the US sense. Always verify the nature of the foreign levy before claiming the credit.

Sourcing Rules: Is Your Bitcoin Gain Actually Foreign Source?

The FTC can only offset US tax on foreign-source income. If your Bitcoin gain is US-source income — even if a foreign country also taxes it — the FTC limitation will severely restrict or eliminate the credit.

Bitcoin capital gains are generally sourced at the seller's residence — not where the exchange is located, not where the Bitcoin was mined, not where the buyer lives.

What this means in practice:

• US resident selling Bitcoin on a foreign exchange: The gain is US-source income. A foreign withholding tax on the transaction may be creditable if it qualifies as an income tax, but the FTC limitation will likely be zero for this income because there is no foreign-source income to support a limitation for the passive basket. Result: little or no usable FTC.
• US expat living in Germany, selling Bitcoin: If the expat is a bona fide resident of Germany and Germany taxes the gain as German-source income, the gain may qualify as foreign-source for US FTC purposes. The German capital gains tax is creditable, and the US taxes the same income — the FTC offsets the double taxation.
• US citizen temporarily working abroad: Tax residence matters. A US citizen who is not a bona fide resident of a foreign country — merely working temporarily — may not be generating foreign-source Bitcoin income, depending on the specific facts and treaty provisions.

The Passive Income Basket

The FTC limitation is calculated separately for different "baskets" of income. The two main baskets are:

• Passive category income: Dividends, interest, rents, royalties, and — critically for Bitcoin holders — capital gains from investment assets. Bitcoin capital gains are passive category income.
• General category income: Wages, salaries, self-employment income, active business income. Bitcoin mining income earned as a trade or business may fall here.

The FTC limitation is calculated separately for each basket. Excess credits in one basket cannot offset US tax on income in another basket (with limited exceptions). A Bitcoin holder with large passive basket foreign taxes and no passive basket FTC limitation headroom cannot use those credits to offset US tax on general category income.

The FTC Limitation Formula

The statutory FTC limitation under §904 is:

FTC Limitation = (Foreign-Source Passive Income ÷ Total Income) × US Tax on All Income

The FTC cannot exceed this limitation for the passive basket. If the foreign tax paid exceeds the limitation, the excess is a credit carryforward.

Worked Example

A US expat living in Portugal sells Bitcoin with a $200,000 long-term capital gain. Portugal taxes this at 28% = $56,000 Portuguese tax paid. The expat's total worldwide income is $400,000 (including the $200,000 Bitcoin gain). US tax on all income = $85,000.

The FTC reduces the combined tax burden by $42,500 in the current year, with an additional $13,500 available as a carryforward to offset future years' US tax on passive income.

Country-by-Country Bitcoin Tax Rates and FTC Value

The FTC is most valuable when a foreign country taxes Bitcoin gains at a rate approaching or exceeding the US rate — because the credit can fully offset US tax. When the foreign rate is very low or zero, there may be little or no tax to credit:

This table illustrates a key insight for US expats choosing jurisdictions: moving to a zero-tax country (UAE, Singapore, El Salvador) does not eliminate US tax on Bitcoin gains — it only eliminates the foreign tax, leaving the full US liability with no FTC offset. Moving to a country that actively taxes Bitcoin gains (Portugal, Australia) actually generates FTC credits that partially offset the US tax — creating a lower combined burden in some cases than a "zero-tax" jurisdiction.

The FEIE vs. FTC Choice: Bitcoin Mining Income

The Foreign Earned Income Exclusion (FEIE) under §911 allows qualifying US expats to exclude up to $126,500 (2024, indexed) of foreign earned income from US taxable income. "Earned income" means wages and self-employment income from services performed abroad.

The critical question for Bitcoin holders: does Bitcoin mining income qualify for the FEIE?

• Bitcoin capital gains: Not earned income. Capital gains are passive investment income. The FEIE does not apply to them regardless of where you live. The FTC is the only mechanism for avoiding double taxation on Bitcoin gains.
• Bitcoin mining rewards (trade or business): Mining rewards taxed as self-employment income from active business operations may qualify as earned income eligible for the FEIE — if the miner meets the bona fide residence or physical presence test abroad and the mining is conducted as a business (not passive investment). This is a fact-specific determination; IRS guidance on Bitcoin mining as "earned income" for FEIE purposes is limited.
• Cannot claim both FEIE and FTC on the same income: If you exclude mining income under the FEIE, you cannot also claim a foreign tax credit on that excluded income. Each dollar of excluded income cannot also support a credit. The choice between FEIE and FTC for mining income requires modeling both paths.

The §911 Housing Exclusion Integration

Expats using the FEIE may also claim the §911 housing exclusion or deduction for qualified housing expenses abroad. These reduce the income subject to US tax, decreasing the FTC limitation (because the limitation is based on US tax before the FTC). When modeling the FTC for Bitcoin gains in a year when you also use FEIE and the housing exclusion, the interaction of these provisions must be modeled together — they affect each other's value through the limitation formula.

Foreign Mining Operations and the FTC

For Bitcoin holders who operate mining equipment abroad — either directly or through a foreign entity — the FTC analysis becomes more complex:

Direct Foreign Mining (Schedule C/F)

A US person who directly operates mining equipment in a foreign country (hardware located in, say, Iceland or Kazakhstan) and pays foreign income or withholding taxes on the mining revenue generates foreign-source ordinary income. This income falls in the general (active) basket if it's a trade or business, and in the passive basket if treated as passive investment. The FTC on this income is calculated through the general basket FTC limitation.

Foreign Corporation Mining (GILTI / Subpart F)

A US person who owns 10% or more of a foreign corporation engaged in Bitcoin mining may be subject to Global Intangible Low-Taxed Income (GILTI) inclusion under IRC §951A and/or Subpart F income inclusion. These are complex regimes that deem certain foreign corporate income to flow through to the US shareholder even without a dividend — and they have their own FTC basket (the "GILTI basket") with a 20% haircut on foreign tax credits in that basket.

For Bitcoin family office clients with offshore mining structures, the GILTI analysis is a threshold issue before any FTC planning. GILTI inclusion rates, the high-tax exception (HTEI) that can exclude income taxed above 18.9% from GILTI, and the interaction with the §250 deduction all require careful modeling. This is not a DIY calculation — international tax counsel is required for any offshore mining structure.

FBAR and FATCA: Reporting Distinct from the FTC

The Foreign Tax Credit is a tax calculation mechanism — it reduces US tax owed. It is entirely separate from the foreign asset reporting requirements that also apply to international Bitcoin holders:

• FBAR (FinCEN Form 114): Required when aggregate value of foreign financial accounts exceeds $10,000 at any point in the year. Whether foreign exchange accounts holding Bitcoin qualify as "financial accounts" remains a developing area; conservative practice is to report them.
• Form 8938 (FATCA): Required when specified foreign financial assets exceed thresholds ($50,000 for US residents; $200,000 for expats). Penalties for non-filing are severe — $10,000 minimum, up to $50,000 for continued failure.

Claiming the FTC correctly on Form 1116 does not satisfy FBAR or FATCA reporting requirements. These are independent obligations. For the full international reporting picture for Bitcoin holders, see our guide on Bitcoin FBAR and FATCA reporting requirements.

Carryback and Carryforward Rules

When the FTC limitation prevents full use of foreign taxes paid in a given year, the excess credits are not lost. Under §904(c):

• Carryback: Excess FTCs can be carried back one year and applied to that year's FTC limitation. This requires filing an amended return for the prior year.
• Carryforward: Remaining excess credits after carryback can be carried forward 10 years. They must be applied in the earliest available year where the passive basket limitation allows absorption.
• Basket-specific: Carryforwards are tracked separately for each basket — passive carryforwards can only be used against future passive basket FTC limitations, general basket carryforwards against future general basket limitations.
• Expiration: Unused FTC carryforwards expire after 10 years. They cannot be deducted or otherwise recovered after expiration.

For Bitcoin holders in high-foreign-tax jurisdictions who have large gains followed by smaller-gain years, the carryforward is a valuable asset that should be tracked carefully on Form 1116 and incorporated into future-year planning. A year of lower Bitcoin income is the opportunity to absorb prior-year carryforwards before they expire.

Credit vs. Deduction: Always Take the Credit

Taxpayers may elect to take a deduction for foreign taxes paid instead of the credit. In almost every case, the credit is superior:

The deduction is only preferable when: the FTC limitation is severely constrained (limiting the usable credit to near zero), and the deduction would provide more value than the limited credit plus any carryforward. This is rare in practice. Always model the credit first.

Note: if you elect the deduction in any year, you cannot claim the credit for any foreign taxes that year — it is an all-or-nothing election for the tax year.

Form 1116: The Mechanics

The FTC for individuals is reported on Form 1116. A separate Form 1116 is required for each basket of income (passive, general, GILTI, etc.) in which you have creditable foreign taxes.

Key Form 1116 elements for Bitcoin holders:

• Part I — Foreign taxes paid or accrued: List each country, the income type (capital gains), and the tax paid in both foreign currency and USD (converted at the spot rate on the date of payment)
• Part II — Foreign income: Enter the foreign-source income in the applicable basket; this determines the FTC limitation ratio
• Part III — FTC limitation: Calculates the maximum credit for the basket based on the limitation formula
• Part IV — Summary: Compares taxes paid against the limitation; any excess is the carryforward amount
• Carryover Schedule: Tracks prior-year excess credits available for use in the current year and future years

For expats with income in multiple countries, the Form 1116 can become complex. Software handles the calculation, but understanding the limitation formula is essential for planning — because the limitation is what determines whether a particular year's foreign taxes are fully usable or partially wasted.

Frequently Asked Questions

The Bottom Line

The Foreign Tax Credit is the primary tool available to US citizens for avoiding double taxation on Bitcoin gains earned and taxed abroad. But it is not automatic — it requires understanding the sourcing rules (is the gain actually foreign-source?), the passive basket mechanics (is the FTC limitation high enough to absorb the foreign taxes paid?), and the FEIE interaction (does mining income qualify, and which path is more valuable?).

For US expats living in countries with meaningful Bitcoin capital gains taxes — particularly Portugal, Australia, Canada, and the UK — proper FTC planning can reduce the effective combined tax rate significantly below what either country would impose alone. For expats in zero-tax jurisdictions, the FTC generates no benefit, and the full US tax applies.

International Bitcoin tax planning is one of the most complex intersections in the tax code. For US citizens living abroad, holding Bitcoin in offshore structures, or operating mining equipment in multiple countries, qualified international tax counsel and an estate planning attorney familiar with cross-border Bitcoin issues are essential. Contact The Bitcoin Family Office for a consultation on international Bitcoin tax strategy.

This guide is for educational purposes only and does not constitute tax or legal advice. International tax law is complex, highly fact-specific, and subject to change. Country-level tax rates described herein may have changed; always verify current rates with local counsel. Consult a qualified international tax advisor and estate planning attorney for advice specific to your situation.