Foreign Tax Credit Explained: How Form 1116 Works and When to Stack It With FEIE
The Basic Mechanic Under IRC §901 Through §908
The foreign tax credit is dollar-for-dollar. Pay $10,000 of income tax to France on French-source wages, and assuming the limitation calculation allows it, you get a $10,000 credit against your US tax on that same income. It’s not a deduction reducing taxable income. It’s a credit reducing the tax itself. That distinction matters because a credit is worth more than a deduction at every income level.
IRC §901 creates the credit and sets the eligibility rules. The tax has to be an income tax, a war profits tax, or an excess profits tax. It has to be imposed on you, not on someone else. It has to be paid or accrued during the tax year. Value-added tax doesn’t qualify. Property tax doesn’t qualify. Social security contributions to a foreign country usually don’t qualify either, with treaty exceptions for places like Canada and a handful of European countries where totalization agreements apply.
Treasury Regulation §1.901-2 defines what counts as a creditable income tax. The test is whether the foreign levy is structured like an income tax in the predominant US sense. The country has to be measuring net gain, reaching realized income, and imposing the tax compulsorily. A few countries have taxes that fail this test, and the FTC isn’t available for those payments.
Then there’s §904, which is where the math gets restrictive. You can’t credit more foreign tax than the US tax on the same foreign income. If France taxes your wages at 45% and the US would tax them at 22%, you can credit the 22% portion and the rest sits in carryover. The formula divides foreign-source taxable income by total taxable income, then multiplies that fraction by total US tax. That product is the limitation. Foreign tax paid in excess of the limitation doesn’t disappear, but it doesn’t reduce this year’s tax either.
§905 covers timing, §906 covers nonresident aliens, §907 covers oil and gas, and §908 covers boycott countries. Most expats only need §901 and §904. The rest are special cases.
One detail that trips up new clients: the credit only applies to foreign income tax. If you pay no foreign tax because you live in a zero-tax country like the UAE or Bahamas, there’s no credit to claim. In that case the FEIE is your only protection, and any income above the $130,000 (2026) exclusion threshold gets taxed at full US rates with nothing to offset it. This is one of the reasons we tell clients moving to low-tax jurisdictions to plan their compensation structure before they go, not after.
Form 1116 vs the $300/$600 Election (No Form Required)
Most expats file Form 1116. It’s the standard mechanism. You list the foreign income by category, list the foreign tax paid, run the §904 limitation calculation, and the resulting credit flows to Schedule 3 of Form 1040, line 1.
There’s a shortcut for small amounts. If your total foreign tax for the year is $300 or less ($600 for joint filers), and all of it is passive category income reported on a 1099-DIV or 1099-INT or a similar statement, you can take the credit directly on Schedule 3 without filing Form 1116 at all. This is the de minimis election in §904(j).
The catch: it has to be entirely passive (dividends, interest, capital gains), and it has to be reported on a qualified payee statement. If even one dollar comes from foreign wages or self-employment, you lose the election and have to file Form 1116 for the whole amount. Most expats with actual foreign earned income are well past the $300 threshold anyway, so the election rarely applies to them. It applies more often to US-based investors holding foreign mutual funds or ADRs.
If you file the full 1116, you file one per category of income. A typical expat with a salary and a foreign brokerage account files two: one for general category (wages) and one for passive category (dividends and interest). Each runs its own §904 limitation separately. You can’t pool excess credit from one bucket to cover shortfall in another. We see returns every year where someone has $15,000 of excess general-category credit and $2,000 of passive-category tax owed, and the excess can’t help. The buckets are sealed.
Form 1116 is also where the foreign tax redetermination rules live. If your foreign tax later changes (a refund from the foreign country, an additional assessment, a currency revaluation), you generally have to go back and amend the year the original credit was claimed. The new rules under §905(c) require you to notify the IRS within a specific window. Most expats don’t realize this and it becomes a problem when an audit pulls a return three years later and the foreign tax number doesn’t match the foreign return.
Passive vs General Category Limitation Buckets
The §904 limitation runs separately for each category. Passive category covers most investment income: dividends, interest, capital gains, royalties, rents not from active business. General category covers everything else, which for most expats means wages and self-employment income.
There are two other categories that exist mostly for businesses: foreign branch income (added by TCJA in 2017) and GILTI (also TCJA). And there are special categories for income re-sourced by treaty, lump-sum distributions, and a few other narrow situations. The average expat with a W-2 equivalent and a brokerage account doesn’t touch those.
Why the buckets matter: excess credit in one bucket can’t offset tax in another bucket. Say you live in a high-tax country like Germany. Your wages get taxed at high German rates, generating excess general-category credit. Your portfolio dividends, often taxed at a lower rate under treaty (15% for US persons getting German dividends), generate passive-category credit that may not fully cover the US tax on those dividends. The excess from wages can’t help with the dividend shortfall. You end up owing US tax on the passive income even though you’ve paid plenty of German tax overall.
This is the single most common source of confusion when clients try to do this themselves with software. The software fills out Form 1116, the buckets calculate correctly, but the client looks at the final number and says “I paid Germany $40,000 in tax, why do I still owe the IRS $3,000?” The answer is bucket separation.
There are planning options. You can sometimes re-source income under a treaty’s re-sourcing provision, which moves passive income to a different category for FTC purposes. That requires careful treaty reading and is usually only worth doing when the dollar amounts are significant. Our tax strategy consulting work covers this for expat clients with high-income portfolios in treaty countries.
One counterintuitive fact: claiming the FEIE actually shrinks your general-category bucket because excluded income doesn’t count as foreign-source income for the limitation calculation. The foreign tax paid on that excluded income also doesn’t count as creditable. So FEIE doesn’t just exclude income from US tax. It also reduces your FTC capacity. That’s part of why the FEIE-vs-FTC analysis is rarely about one or the other in isolation.
Carryback One Year, Carryforward Ten Years
If your foreign tax exceeds the §904 limitation in a given year, the excess doesn’t vanish. It carries back one year and forward ten. This is one of the genuinely good features of the FTC. Excess credit becomes a stored asset.
The mechanics: any excess credit in a category first carries back to the immediately preceding year. If that year had unused limitation capacity, the credit absorbs against it and you amend the prior return for a refund. Whatever doesn’t fit in the carryback year then carries forward for up to ten years, used in order against any future excess limitation in the same category.
Most expats waive the carryback by election and just carry forward. Filing an amended prior-year return is paperwork-heavy and the credit usually finds a home in a future year anyway. The waiver is made by attaching a statement to the return for the year the credit was generated.
We’ve seen clients move to a high-tax country, build up six figures of carryforward credit over three or four years, then move back to the US or relocate to a low-tax country and start drawing those credits down against US tax on remaining foreign-source income. A client who moves from Switzerland to Dubai, for instance, often has carryforward credit that protects them on residual investment income for years after the move.
The catch is bucket integrity. Carryforward credit stays in its original category. General-category carryforward only offsets general-category limitation in future years. If your future income shifts entirely to passive sources, your old wage-bucket credits may expire without being used.
The ten-year window also runs from the original year, not from when you became aware of the credit. Late-filed amended returns to claim missed FTC credit are subject to the regular statute of limitations on refunds, which is generally three years from the original return or two years from payment. So discovering an unclaimed credit eight years later usually means you can’t recover it.
FTC vs FEIE — Which Is Better (It Depends on the Country’s Tax Rate)
The shortcut answer: if you live in a high-tax country, FTC almost always wins. If you live in a low-tax or zero-tax country, FEIE almost always wins. The dividing line is roughly the US effective rate on your income level. If the foreign country taxes you at a higher effective rate than the US would, FTC fully covers your US tax and leaves you with carryforward. If the foreign rate is lower, FEIE excludes more income from US tax than the credit would cover.
Specifics matter. The FEIE under §911 excludes up to $130,000 (2026 inflation-adjusted) of foreign earned income from US tax. Income above the exclusion ceiling still gets taxed, but the stacking rule in §911(f) means it gets taxed at the rate that would have applied if you hadn’t excluded the lower portion. You don’t drop into a lower bracket by excluding income.
The FTC has no income ceiling. If you pay $200,000 of foreign tax on $400,000 of foreign income, you get up to a $200,000 credit (subject to the §904 limitation). For high-income expats, FTC has more room to run.
There’s also the housing exclusion or deduction under §911 to consider. It runs alongside FEIE for people in high-cost cities, with specific caps for places like London, Hong Kong, Tokyo, and Singapore. Once you’re using both FEIE and the housing exclusion, you’re often covering most of your earned income, and FTC’s role becomes residual.
A worked example: client in Germany with $180,000 in wages, $50,000 of German tax paid. FEIE excludes $130,000. The remaining $50,000 of wage income gets US tax at the stacked rate (around 24% marginal), which is roughly $12,000 of US tax. The German tax on that $50,000 portion is roughly $20,000. FTC on the residual $50,000 covers the $12,000 US tax with $8,000 of carryforward. The combined approach beats either method alone. Same client in Dubai (zero tax): FEIE covers the $130,000, and the residual $50,000 owes full US tax with no offset. FTC alone would be useless because there’s no foreign tax to credit.
We model this both ways for every new expat client. The math isn’t intuitive and the right answer changes when income, country, or filing status changes. Our expat tax practice runs this analysis as part of the standard intake.
When You Can Stack FEIE and FTC on the Same Return
FEIE and FTC aren’t mutually exclusive. They operate on different slices of income. You can claim FEIE on earned income up to the exclusion ceiling and claim FTC on everything else: wages above the ceiling, self-employment income above the ceiling, investment income, rental income, capital gains, and any other foreign-source income.
What you can’t do is claim FTC on income you’ve already excluded under FEIE. The income covered by the exclusion isn’t subject to US tax, so there’s no US tax to credit against. The foreign tax paid on that excluded portion is also non-creditable. Publication 514 spells this out and Form 1116 has a specific line for backing out foreign tax allocable to excluded income.
The allocation usually runs proportionally. If you earned $180,000 of foreign wages and excluded $130,000 under FEIE, you allocate the foreign tax in a 130/180 ratio. The 130 portion is non-creditable. The 50 portion is available for FTC. The math is simple but easy to mess up if you do it by hand.
Stacking is common for high earners. A finance professional in London making $300,000 with $100,000 of UK tax paid will claim FEIE on the first $130,000 and FTC on the remaining $170,000. The FTC eats into the residual US tax, which is the only place US tax is owed at all. Done right, the total US tax bill is often zero or near zero.
The FEIE election under §911 is also revocable in a specific way. Once you revoke FEIE, you generally can’t re-elect it for five years without IRS consent. We’ve watched clients revoke FEIE thinking they’ll move to FTC-only because they’re in a high-tax country, then their situation changes and they’re locked out of FEIE for the rest of the assignment. We tell clients not to revoke unless they’re sure of a multi-year plan.
There’s also the FEIE-only alternative: use FTC for everything, skip FEIE entirely. This makes sense in very high-tax countries where the residual US tax after FEIE is zero anyway, and the FTC carryforward generated by skipping FEIE is more valuable than the simplicity. It’s a judgment call we make on facts and forecasted income.
Common Errors — Claiming Credit on Income FEIE Already Excluded
The single most common error on self-prepared expat returns is claiming FTC on foreign tax paid on income that was excluded under FEIE. The IRS catches this often. The credit gets disallowed and you owe back tax plus interest, sometimes plus penalties.
It happens because tax software doesn’t always allocate correctly when both elections are made. The user enters total foreign income, total foreign tax, and the FEIE amount. The software is supposed to back out the FEIE-allocated foreign tax from the FTC calculation. Some software does this cleanly, some does it badly, some doesn’t do it at all unless you manually override.
Other recurring errors we see: claiming FTC for foreign social security contributions that aren’t creditable (Canada CPP is, UK NI is not, France CSG is partially); claiming FTC for VAT or sales tax (never creditable); claiming FTC for taxes paid by an employer on your behalf that weren’t actually imposed on you; using the wrong category bucket; missing the §904 limitation because you confused total foreign tax with creditable foreign tax.
Currency conversion is another problem area. You translate foreign tax paid into US dollars using the exchange rate on the date of payment, not the year-end rate. For accrual-basis taxpayers it’s the year-end rate. Most expats are cash-basis and miss the timing rule, using year-end rates when they should be using payment-date rates. The difference is usually small but it surfaces in audit.
Form 1116 Schedule B (the carryover schedule, formally adopted in 2021) trips people up too. If you have prior-year carryforward credits, you have to list them year by year, by category, and show how they get absorbed. Sloppy carryover tracking leads to either understating credit (leaving money on the table) or overstating it (audit risk).
We also see expats forgetting that Form 1116 has to be filed every year the credit is claimed, even if the calculation shows zero owed. The form is required when foreign tax exceeds $300 (or $600 joint), regardless of how the math comes out. Missing the form because the credit happens to be zero this year is a common compliance miss.
State Tax Treatment — Most States Don’t Allow the FTC
Federal FTC doesn’t carry to most state returns. States generally don’t recognize foreign tax credits. Some states allow a deduction for foreign tax paid (treating it like a state-and-local tax deduction), but not a credit. The result: if you owe state tax as a US expat (which depends entirely on state residency rules), you pay full state rate with no offset for foreign tax already paid.
California is the worst offender. It’s aggressive on residency, doesn’t allow FTC, doesn’t recognize the FEIE for state purposes, and pursues former residents for years after departure unless they cut ties cleanly. We tell California-based clients planning a move abroad to spend serious time on the residency exit before they leave: change driver’s license, change voter registration, sell or rent out the primary home, close in-state bank accounts, get a new domicile in a no-income-tax state if possible. Without those steps, California taxes their global income for years.
New York is also aggressive but slightly more workable. The 183-day rule and the permanent place of abode test are the main hooks. We’ve moved clients from New York to non-domiciled status by getting them into a permanent place of abode in a no-tax state and limiting NY days strictly. Our expat clients in the NY area get this analysis as part of every move-abroad planning engagement.
Some states have no income tax and the question doesn’t arise: Florida, Texas, Tennessee, Washington, Wyoming, South Dakota, Nevada, Alaska, and (for wages only) New Hampshire. Expats domiciled in those states have a much cleaner federal-only filing picture.
A few states do offer something. Massachusetts allows a credit for tax paid to Canada under specific conditions. Some states allow a partial credit if the foreign tax was on income that the state would also tax. The rules are narrow and state-specific. Most expats with multi-state exposure end up paying full state tax on foreign income with no offset.
The strategic implication: if you’re planning a multi-year expat assignment from a high-tax state, the state tax problem may be the biggest cost line, not the federal one. Federal FTC and FEIE often eliminate federal liability. State tax often doesn’t move. Address the state residency question before you board the plane.
Frequently Asked Questions
What is the foreign tax credit explained in simple terms?
The foreign tax credit explained in plain terms: it’s a dollar-for-dollar credit against your US income tax for income tax you’ve already paid to a foreign country on the same income. The US taxes its citizens and green card holders on worldwide income no matter where they live. That creates a double taxation problem for anyone living abroad: the foreign country wants tax on local-source income, and the US wants tax on the same income because of the worldwide rule. The foreign tax credit is one of two main mechanisms (along with the FEIE) that prevents the same dollar from being taxed twice.
The credit comes from IRC §901. The basic rule is straightforward. You paid $X of foreign income tax. You get up to $X of credit against your US tax on the same income. The credit reduces your US tax bill directly, not just your taxable income. That makes it worth more than a deduction at every income level. A $10,000 credit saves you $10,000 in tax. A $10,000 deduction saves you $2,400 or $3,500 depending on your bracket.
The full mechanic has more moving parts than the basic rule suggests. The foreign tax credit explained completely involves §904‘s limitation calculation, which caps the credit at the US tax on the foreign-source portion of your income. It involves separate category buckets (passive vs general) that don’t cross-pollinate. It involves carryback and carryforward rules so excess credit doesn’t get wasted. And it involves the interaction with FEIE under §911, where claiming both means allocating tax between excluded and non-excluded income.
The form you file is Form 1116. The credit flows to Schedule 3 of Form 1040. The IRS-published guide is Publication 514, which is the most readable resource for taxpayers and runs about 50 pages with examples.
For most expats, the foreign tax credit explained in practice means: file Form 1116 every year, track which income falls in which category bucket, keep records of foreign tax paid in foreign currency converted to USD at the right exchange rate, and watch the carryover schedule so unused credit doesn’t expire. The simpler de minimis election exists ($300/$600 with no form filing) but it only applies to small amounts of passive income reported on US-issued statements.
The thing most newcomers miss is the limitation calculation. Foreign tax paid doesn’t equal foreign tax credit claimed. The two numbers diverge whenever the foreign country taxes the income at a higher effective rate than the US would. You pay $50,000 to Germany, the US tax on that income is $30,000, your credit this year is $30,000, and $20,000 carries forward. That $20,000 isn’t lost. It just has to wait for a future year with capacity to absorb it.
We see clients try to short-circuit this with software defaults and end up either claiming too much (audit risk) or too little (money left on the table). The foreign tax credit explained correctly takes about 30 minutes of analysis per return once the data is gathered. Skipping that analysis is where most self-prepared expat returns go wrong.
When does the foreign tax credit explained correctly beat the foreign earned income exclusion?
The foreign tax credit beats the FEIE in high-tax countries. That’s the short version. The longer version requires looking at the country’s effective tax rate against the US rate that would otherwise apply, plus your income level, plus whether you have non-wage income, plus whether you have a future plan that might benefit from carryforward credit.
The foreign tax credit explained against the FEIE: FEIE excludes up to $130,000 (2026) of foreign earned income from US tax. Anything above that is fully taxed at the rate that would have applied without the exclusion. The exclusion is income-based. The FTC, by contrast, has no income ceiling. It’s tax-based: you get credit for foreign tax paid, capped by the US tax on foreign-source income.
Math example one: client in Germany making $300,000 with $120,000 German tax paid. FEIE excludes $130,000, leaving $170,000 taxed at roughly 32% marginal in stacked rates, about $54,000 of US tax. Then you’d need FTC on top to cover that $54,000. Combined FEIE+FTC approach handles it, and the residual is zero.
Math example two: same client, FTC only, no FEIE. All $300,000 is foreign-source, US tax is roughly $75,000 after standard deduction, German tax is $120,000, FTC fully covers the $75,000, and you have $45,000 of carryforward credit for future use. The FTC-only path generates more carryforward asset. The combined path generates less carryforward but has the same current-year result. For a multi-year assignment in Germany, the FTC-only path often comes out ahead because the carryforward has real future value.
Math example three: client in Dubai (zero tax) making $200,000. FEIE excludes $130,000, residual $70,000 taxed at roughly 24% marginal, $17,000 of US tax. FTC contributes nothing because there’s no foreign tax paid. FEIE is the only protection and it does the heavy lifting. The foreign tax credit explained in a zero-tax country isn’t really an option; it’s a non-tool.
Math example four: client in Singapore (15% effective on foreign earned income, generous treaty terms) making $200,000. FEIE excludes $130,000, residual taxed at US rates with FTC against the $10,500 of Singapore tax allocable to the residual. Both options work. Modeling shows FEIE-only is slightly better here because Singapore’s rate is below US rate at this income level.
The countries where FTC reliably beats FEIE: Germany, France, UK at higher income levels, Australia, Belgium, Sweden, Norway, Italy, Spain (in most cases), Netherlands. The countries where FEIE wins: UAE, Bahamas, Saudi Arabia, Bahrain, Kuwait, Qatar, Hong Kong (territorial system means most foreign-source income isn’t taxed locally), Singapore at most income levels.
The countries in between where it depends on facts: Ireland, Switzerland (cantonal variation), Israel, Japan (depends on income mix), Canada (depends on province and income mix). We run the foreign tax credit explained analysis for every new expat client because the right answer changes with country, income level, family situation, and forecast horizon. Our expat practice includes this modeling as part of every engagement.
How do I claim the foreign tax credit explained step by step on Form 1116?
Form 1116 has three parts plus an optional Schedule B for carryovers. The foreign tax credit explained through the form requires you to fill out one Form 1116 per category of income. A typical expat with wages and a brokerage account files two: one for general category, one for passive category.
Part I is taxable income from foreign sources. You list gross income by country, then subtract deductions allocable to that income. The allocation rules in §861-865 govern this. Direct expenses (foreign tax preparation fees) get allocated directly. Indirect expenses (standard deduction, state tax) get allocated by ratio of foreign to total income. The output of Part I is foreign-source taxable income for the category.
Part II is foreign taxes paid or accrued. You list the foreign tax in foreign currency, the exchange rate, and the USD equivalent. Cash-basis taxpayers use the exchange rate on the date of payment. Accrual-basis use the average rate for the year. You can elect either method but you have to be consistent.
Part III runs the §904 limitation. The formula: foreign-source taxable income (from Part I) divided by total taxable income (from Form 1040), multiplied by total US tax. That product is the limitation. You compare it to the foreign tax paid (from Part II) and take the lesser of the two. That’s your credit for the category.
Schedule B is where carryovers live. If you have prior-year unused credit, you list it by year (going back ten years) and show how it gets absorbed this year. New unused credit from this year goes on the schedule too, ready to carry forward.
The credit total from all Forms 1116 flows to Schedule 3 of Form 1040, line 1, which reduces your tax liability. The foreign tax credit explained on the return shows up as a single line item even though it represents potentially multiple forms behind the scenes.
Specific filing tips. Use the right country code (IRS publishes the list). Match the country to the actual source of the income, not where you live. If you live in Germany but earn dividends from a French company, the dividends are French-source for FTC purposes. Track carryovers in a spreadsheet outside the software, because software handles them inconsistently and a missed carryover from year four becomes a real problem in year seven.
We’ve never met an expat self-preparer who got Schedule B completely right on the first try. The foreign tax credit explained through Form 1116 isn’t conceptually hard but the mechanical work demands attention. We charge our expat clients a flat fee per return that includes the FTC calculation, the FEIE analysis, and the multi-year carryforward tracking. Reach out if you want a quote.
Does the foreign tax credit explained correctly carry over to future years?
Yes. Excess credit carries back one year and forward ten. This is one of the genuine advantages of the FTC over the FEIE. The exclusion is use-it-or-lose-it each year. The credit can be stored.
The mechanic: if your foreign tax paid in a category exceeds the §904 limitation for that category, the excess first carries back to the immediately prior tax year. You’d file an amended return for that year to claim it, assuming the prior year had unused limitation capacity in the same category. Most expats elect to waive the carryback and just carry forward, because amending a prior return is paperwork and the credit usually finds a home in a future year.
Carryforward runs ten years from the year the credit was generated. Year of generation is year zero. You can use the credit in years one through ten. After year ten, unused credit expires. The foreign tax credit explained completely includes this expiration: it’s not unlimited storage, but ten years is long enough to accommodate most expat career arcs.
Category integrity is the part people miss. General-category carryforward can only be used against general-category limitation in future years. Passive-category carryforward only against passive-category limitation. The buckets stay separated through the carryover period. If you generate $50,000 of general-category carryforward and your future income switches entirely to passive (dividends, retirement income), the general-category carryforward will likely expire unused.
The foreign tax credit explained in a multi-year context: we tell clients heading to high-tax countries to expect carryforward to build up year over year. A client moving to Germany with $200,000 of wages often generates $20,000-$40,000 of annual carryforward. After three years that’s $60,000-$120,000 stored. When they move back to the US or to a low-tax country, that stored credit protects them on residual foreign-source income (foreign pension, foreign investments, foreign rental property) for years.
There’s a planning angle here. If you know you’re going to have a future year with high foreign-source income but low foreign tax (sale of a foreign asset taxed at low rates, distribution from a foreign retirement plan), you want carryforward credit available to apply against the US tax on that future event. Building up carryforward intentionally during high-tax years is a real strategy for expats with predictable future liquidity events.
The interaction with FEIE matters again. FEIE shrinks the foreign-source income that counts for the limitation, which shrinks future capacity to absorb carryforward. If you have substantial carryforward and your foreign income drops to FEIE-only levels (say you go part-time or take a pay cut), the carryforward may not get absorbed. Some clients in this situation revoke FEIE to free up limitation capacity, though the five-year re-election lockout under §911 makes that decision sticky.
Track carryovers in a separate spreadsheet outside the tax software. The foreign tax credit explained through software gets close but doesn’t always preserve detail across years, especially when you switch software. We maintain a multi-year carryforward schedule for every expat client we prepare for, and we’ll provide a copy when we hand off a final return.
How does the foreign tax credit explained interact with treaty-sourced income?
Tax treaties affect the FTC in two main ways: they re-source certain income for credit purposes, and they reduce or eliminate foreign withholding tax on certain payments, which reduces the FTC available. The foreign tax credit explained in a treaty context requires reading the specific treaty article that governs the income type at issue.
Re-sourcing first. Most US tax treaties have a clause that says income paid to a US resident from a treaty country, that would otherwise be US-source under domestic rules, can be re-sourced to the treaty country for FTC purposes. The classic example: a US citizen living in France earns interest from a US bank. Under US rules, that interest is US-source (place of payer’s residence). Under treaty re-sourcing, France can tax it as France-source resident income, and you can re-source it back to France for FTC limitation purposes. Without re-sourcing, you’d have French tax on US-source income and no FTC capacity because foreign-source income would be too low.
The re-sourced income gets its own category bucket sometimes, called “income re-sourced by treaty.” It doesn’t always merge with general or passive. The result: you may file three or four Form 1116s, one per category, when you have re-sourcing in play.
Withholding tax reduction is the other angle. Treaties reduce withholding rates on dividends, interest, and royalties paid between treaty countries. A US person owning German stock might face 26.375% statutory German withholding on dividends, but the US-Germany treaty caps it at 15%. The treaty rate is the creditable rate. You can’t claim FTC for the excess statutory tax above the treaty rate because you weren’t required to pay it. You should have claimed treaty benefits and the excess is non-creditable.
We see expats miss this often. They get a dividend statement showing 26% withholding, claim FTC for the full 26%, and the IRS disallows the excess on audit. Publication 514 covers the rule explicitly. The foreign tax credit explained correctly for treaty income means claiming the treaty rate as the creditable amount, even if the foreign country actually withheld more.
Recovery of excess withholding is a separate workstream. You file a treaty reclaim with the foreign tax authority to get the excess withholding refunded. It’s slow (often 12-24 months) and country-specific. France and Germany have functional reclaim systems. Switzerland and the UK are workable. Some countries are essentially impossible to recover from. The foreign tax credit explained with reclaim in mind: claim the treaty rate as creditable, pursue the excess as a reclaim from the foreign country, don’t try to credit excess withholding against US tax.
Saving clauses complicate this further. Most treaties have a saving clause that lets the US tax its citizens as if the treaty didn’t exist for many provisions. The saving clause is what allows the US to tax citizens worldwide despite treaties. The interaction with re-sourcing is technical and we handle it case by case.
For expat clients with significant treaty exposure, we run an annual treaty audit: which articles apply to which income, what the treaty rates are versus statutory, whether reclaims are needed, and how the re-sourcing plays into the FTC limitation. The foreign tax credit explained at this level isn’t a do-it-yourself exercise. Our tax strategy consulting covers treaty planning as part of expat engagements with material treaty-country exposure.
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