Foreign Income Tax Calculator
The formula
What the credit not deduction tells you
Foreign taxes offset US tax dollar-for-dollar only up to the US rate on that foreign income — the limitation is the whole game.
Calculation: US tax credited against foreign paid, capped by FTC limitation = US tax × foreign ∕ total income. Enter your inputs and every substitution is shown below the result.
Reading the result
Paying 22% abroad at a 24% US bracket still owes the 2-point spread to the IRS.
Rules of thumb: Model FEIE and FTC every expat year; never default
Limitations and best practice
FEIE requires 330 days or bona fide residence and strips the foreign income from FTC math — choosing between them is a fork.
This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Frequently asked questions
FEIE or FTC?
Treaty relief?
FBAR and 8938?
Source & methodology
IRC §901/§911; IRS Form 1116 limitation.
Foreign Income Tax explained: formula, worked example and honest limits
You are checking what an income number really means after the deductions and conversions are applied. Searchers land on a Foreign Income Tax page for three reasons — to plan, to compare options, and to check that somebody else’s arithmetic is honest. This tool serves all three, and everything after the calculator explains the model instead of hiding it.
The number itself is the easy part. What takes judgement is knowing which inputs are facts in your situation and which are guesses wearing a decimal point — a distinction this page makes explicit for every field above.
The useful way to hold Foreign Income Tax is as a ratio with a story attached: US tax credited against foreign paid, capped by FTC limitation = US tax × foreign ∕ total income says how the parts combine, and the $17,742 figure above is simply that sentence written in numbers. Everything that follows unpacks one clause of the sentence at a time.
Every figure in the prose is generated by the engine rather than written beside it — the worked example resolves to extra US tax owed = $17,742 on the default inputs, and the sensitivity section ranks the inputs that move the result — Worldwide income first, at ≈30.2 % of the headline for a ten-percent error either way in that input. Read the sections in order and you will be able to reproduce every figure by hand.
Inside the Foreign Income Tax calculation: formula and every input
The engine implements a single stated model: US tax credited against foreign paid, capped by FTC limitation = US tax × foreign ∕ total income. There is no hidden coefficient and no login-gated precision — the formula printed is the formula executed, which is also what makes the result citable.
Worldwide income ($) (example value 245,000) is a measured number in the unit named by the label; the formula does not convert for you. Use the figure exactly as the source document states it, not a rounded memory of it — an omitted line is the classic silent error.
Foreign income ($) (example value 68,500) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Keep every money input in the same currency; mixing systems quietly corrupts the comparison.
Foreign tax paid ($) (example value 6,922) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Replace the example with the figure from your own records — the tool recomputes instantly and the printed steps follow your numbers.
Your marginal US rate (%) (example value 22) is a measured number in the unit named by the label; the formula does not convert for you. Enter it exactly as your document states it — quoted annual, monthly and effective rates are three different numbers.
Foreign tax exclusion claimed ($) (example value 133,058) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Replace the example with the figure from your own records — the tool recomputes instantly and the printed steps follow your numbers.
Foreign Income Tax on the example inputs: the complete substitution
Abstract formulas are hard to trust, so here is the complete substitution using the default inputs, written the way an examiner would want it. Starting figures: Worldwide income ($), Foreign income ($), Foreign tax paid ($), Your marginal US rate (%). The endpoint of that chain is $17,742 of extra US tax owed, sitting in the “FTC leaves $17,742 on the table because the foreign rate under-taxed the US rate” band.
- US after exclusion: $24,627
- Limit = US tax × foreign/total = $6,886
- Credit min(paid, limit) = $6,886 → owes $17,742
FTC limitation this year — $6,886. Read next to the headline, this is the figure that shows the shape of the trade-off.
Foreign tax paid — $6,922. Compare it against the main result of $17,742 before drawing conclusions.
Excess credit carried forward — $36.42. This is the number experienced users quote when the headline alone would mislead.
Combined worldwide burden — $24,664. If your inputs change, this is usually the first companion figure to move.
Re-running with your own figures is instant; re-running by hand once is the best way to know the tool is telling you the truth.
The Foreign Income Tax corridor: your result across a realistic band
Read this table as the practical error bar on the headline figure. It answers the question people actually have after seeing a single number: how wrong could this be if the main input is off by ten or twenty percent?
| Worldwide income setting | Extra US tax owed |
|---|---|
| 80 % of the example value | $9,008 |
| 90 % of the example value | $13,261 |
| example inputs | $17,742 |
| 110 % of the example value | $23,095 |
| 120 % of the example value | $28,485 |
Across 5 settings of Worldwide income, the result spans $9,008 to $28,485. A decision that only works at one row of this table is a decision waiting for an input to move. Reproduce it in the form above by editing Worldwide income alone; the substitution steps will follow your figures exactly.
What actually moves your Foreign Income Tax
This list was computed for this specific engine just now: each numeric input was nudged ±10 % while every other field held its example value, and the extra US tax owed was recalculated from scratch. It is the fastest honest answer to “what matters most in Foreign Income Tax?” — and it is specific to these defaults, because sensitivity moves with the starting point.
- Nudge Worldwide income by ±10 % and Foreign Income Tax lands between $13,261 and $23,095 (sensitivity ≈30.2 %)
- Nudge Foreign tax exclusion claimed by ±10 % and Foreign Income Tax lands between $15,633 and $20,633 (sensitivity ≈16.3 %)
- Your marginal US rate: ten percent up gives $20,168, ten percent down gives $15,967 — ≈13.7 % of the extra US tax owed either way
- Nudge Foreign income by ±10 % and Foreign Income Tax lands between $17,705 and $18,430 (sensitivity ≈3.9 %)
- Foreign tax paid: ten percent up gives $17,742, ten percent down gives $18,397 — ≈3.7 % of the extra US tax owed either way
Worldwide income is the dominant lever here: ten percent either way moves the result by about 30.2 %, from $13,261 to $23,095. That is where a careless figure does the most damage, so check it against a source, and treat Foreign tax exclusion claimed as the second priority (≈16.3 % per ten percent). The remaining fields can sit at safe defaults without materially changing the answer — knowing which is which is what separates a careful calculation from an anxious one.
Is your Foreign Income Tax good — reading the result bands
The value above only becomes useful the moment you know what it is being measured against. The verdict attached to the default calculation — “FTC leaves $17,742 on the table because the foreign rate under-taxed the US rate” — is one band on a ladder your own figure may sit somewhere else on. How much of that band is luck? On Worldwide income alone ten percent either way covers $13,261 to $23,095. The practical reading rules: read the band as a starting hypothesis, then test it: change the two dominant inputs by ten percent and see whether the verdict survives. Verdicts that survive stress are the ones worth acting on.
Where Foreign Income Tax sits next to similar measures: this tool answers “how much is the Foreign Income Tax”, while the related calculators answer “what do I do about it”. Reading the result alone tends to over-weight a single snapshot; pairing it with the companion tools above turns the number into a decision.
Why Foreign Income Tax results go wrong — and how to prevent it
FEIE requires 330 days or bona fide residence and strips the foreign income from FTC math — choosing between them is a fork. This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Confusing annual with monthly rates. A "1 % per month" fee is roughly 12.7 % annualized; the calculator takes one convention, and picking the wrong one can misstate Foreign Income Tax by double digits.
One mistake is specific to this engine: assuming every input matters equally. The computation above shows Worldwide income dominating — a careful figure there beats false precision everywhere else.
A final trap is presentation: reporting Foreign Income Tax to more decimal places than the inputs support. The tool prints what the arithmetic gives; you should quote only what your least precise field justifies.
Foreign Income Tax verification checklist
- Compare the result with one independent method or published benchmark.
- Check whether the formula treats your inputs as nominal or real dollars.
- Check Worldwide income before anything else: it is the measured dominant input, ≈30.2 % of Foreign Income Tax per ten percent.
- Recompute once with the dominant input deliberately set low, and see whether the decision changes.
- Re-run the calculation with a ±10 % stress on the two most sensitive inputs.
- Confirm the answer against one independent method or published benchmark for Foreign Income Tax.
How to use the Foreign Income Tax tool properly
The tool does the arithmetic; the routine below is what makes the arithmetic trustworthy. Five steps, a minute total — and afterwards you will know not just what the number is, but which assumption produced it.
Step 1 — gather before you type. Foreign Income Tax depends on worldwide income ($), foreign income ($), foreign tax paid ($), your marginal us rate (%), foreign tax exclusion claimed ($). Collect them from a source document — a statement, a report, an invoice, a log — rather than from memory, because recalled inputs are the single largest cause of wrong results. A figure nobody can reproduce is a figure nobody will act on twice.
Step 2 — baseline before exploration. Get one defensible Extra US tax owed on screen before you start nudging numbers. Without a baseline, every variation looks interesting and none of them means anything. Note the assumption you are least sure about; that is where the real risk lives.
Step 3 — change one input at a time. Nudge a single field by ten percent, watch the headline and its companions move, then undo it. Two or three fields will dominate — the sensitivity table above already ranks them for this engine. Numbers are cheap to produce and expensive to retract; the extra minute is the cheapest insurance available.
Step 4 — stress before you commit. A decision that survives a ten-percent squeeze on its two biggest inputs needs no luck to be sound. One that does not survive is a decision about hope, not about arithmetic. When in doubt, prefer the boring input: the interesting one is usually the one you misread.
Step 5 — schedule the next run. In Finance & Banking the inputs drift quietly. Put a reminder a quarter out, re-enter the same fields, and read the change rather than the level. The point of transparency is that a reader can disagree with a specific line rather than with you.
The real-world conversations Foreign Income Tax settles
Numbers earn their keep in conversations, and Foreign Income Tax is no exception. In Finance & Banking discussions around Taxes, this figure decides whether an option stays on the table: it converts an opinionated debate into an arithmetic one, and arithmetic is the only referee both sides accept. Suspiciously tidy answers deserve the same scrutiny as untidy ones.
The companion outputs — FTC limitation this year and Foreign tax paid — exist for the second stage of that screen: the headline sizes the prize, while the companions describe the trade-off you are accepting to get it. If the verdict changes with a ten-percent nudge, report the nudge alongside the number.
Re-running this page costs nothing and catches the slow drifts that never announce themselves. In Finance & Banking the expensive mistakes are rarely sudden; they are small changes in Worldwide income ($) that nobody recalculated for a year. Estimates improve most when the worst case is written down in ink.
The questions that come up most about Foreign Income Tax
What affects Foreign Income Tax the most?
Measured on this engine, Worldwide income is the dominant lever: moving it ±10 % shifts the extra US tax owed across $13,261 to $23,095 — about 30.2 % of the headline, with Foreign tax exclusion claimed next at ≈16.3 %. The ranked list in the sensitivity section is computed live, not asserted from a template.
Which matters more: foreign tax exclusion claimed or worldwide income?
By the numbers, Worldwide income: a ten-percent change in it moves the result ≈30.2 %, versus ≈16.3 % for Foreign tax exclusion claimed. Spend your measuring effort in that order — precision on the weaker lever buys almost nothing.
What is a typical Foreign Income Tax?
On the worked example above Foreign Income Tax comes out at $17,742. Treat that as one point on a distribution rather than a norm: the bands, the companion outputs and the sensitivity ranking tell you how wide the plausible range really is.
How do I calculate Foreign Income Tax by hand?
US tax credited against foreign paid, capped by FTC limitation = US tax × foreign ∕ total income is the entire method. Work the inputs in that order — US after exclusion: $24,627 — and you will reach $17,742 on the default figures, the same number this tool prints.
What happens to Foreign Income Tax if worldwide income changes by 10 %?
On these inputs a ±10 % change in worldwide income takes Foreign Income Tax to $23,095 against the $17,742 example — around 30.2 % of the headline. The same test on every other field is in the sensitivity section.
Is the Foreign Income Tax result of $17,742 good or bad?
Neither, on its own — the label “FTC leaves $17,742 on the table because the foreign rate under-taxed the US rate” is the band this figure falls in for the example inputs, and your own inputs will place you elsewhere on the same ladder. Judge the number against your history and your alternatives, and remember that a ten-percent error in Worldwide income alone moves it by ≈30.2 %.
Is Foreign Income Tax accurate?
The arithmetic is exact: US tax credited against foreign paid, capped by FTC limitation = US tax × foreign ∕ total income is evaluated with full floating-point precision and every substitution is printed in the worked example. What limits accuracy is input quality and the model’s assumptions, so treat the $17,742 result as the correct answer to the question you typed — and check the assumptions section before acting on it.
How often should I check Foreign Income Tax?
Whenever an input changes by more than a few percent, and otherwise on the rhythm of your decisions — before a purchase, a review, a renewal. Foreign Income Tax is a snapshot, not a subscription; stale snapshots are the most common silent error in Finance & Banking planning.
FEIE or FTC?
If foreign rate exceeds US on that income, FEIE often wins; housing and credits change the answer.
Treaty relief?
Some treaties exempt specific income classes entirely — always before credits.
Does this Foreign Income Tax tool store my numbers?
No. The entire calculation runs in your browser session; nothing entered above is transmitted or saved, which is the correct behaviour for sensitive Finance & Banking figures and the reason you can re-run this page as often as you like.
Key terms on this page
- FTC limitation this year
- $6,886 in the default Foreign Income Tax calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Foreign tax paid
- $6,922 in the default Foreign Income Tax calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Excess credit carried forward
- $36.42 on the example inputs — a companion figure printed beside the headline of Foreign Income Tax so that no result is read in isolation.
- Extra US tax owed
- The primary output of this tool: $17,742 for the default inputs, computed exactly from US tax credited against foreign paid, capped by FTC limitation = US tax × foreign ∕ total income.
- Worked example
- The step-by-step substitution printed above, so the arithmetic can be re-derived by hand or in a spreadsheet.
- Verdict band
- The plain-language label — here “FTC leaves $17,742 on the table because the foreign rate under-taxed the US rate” — mapping the computed figure onto experience-based ranges for Finance & Banking.
- Sensitivity (±10 %)
- How far the Foreign Income Tax moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Method, sources and what this tool cannot tell you
The model is published arithmetic implemented exactly as written: US tax credited against foreign paid, capped by FTC limitation = US tax × foreign ∕ total income. Source of record: IRC §901/§911; IRS Form 1116 limitation. Where a professional version of this calculation differs, it differs in inputs and jurisdiction-specific coefficients, not in the algebra — which is why re-checking your inputs beats hunting for a second calculator.
This page is an estimation aid, not professional advice. The design rule is simple: two people entering identical figures must get identical answers. The promise to the reader is narrow and testable: same inputs, same output, no silent rounding, and no figure presented without the formula that produced it.
What to do with your Foreign Income Tax next
Re-run at your actual tax and deduction figures rather than the defaults; the gap between them is your real take-home.
The audience here is workers and employers working out what money actually arrives. Everything you need to defend the result — formula, substitution, sensitivity, source — is printed above, so the only remaining variable is the honesty of your inputs.