Foreign Tax Credit Calculator
The formula
What the foreign tax credit tells you
The anti-double-taxation valve for taxes paid abroad: creditable foreign tax up to the US tax attributable to foreign income, with excess parked for 11 years — the core of every cross-border return.
Calculation: Limitation = US tax × (foreign income ÷ worldwide income); excess credits carry 1-back/10-forward. Enter your inputs and every substitution is shown below the result.
Reading the result
High-tax countries generate credit overflow (carryforward is fine if you expect income mix changes); never claim a credit for taxes that are really subsidies or not "legal and actual."
Rules of thumb: Corporates: FTC planning drives check-the-box elections; individuals with < $600 credit may skip Form 1116 entirely
Limitations and best practice
Basketing: general vs passive category limits apply — mixing passive income with business income strands credits if you skip Form 1116’s categories.
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
Credit or deduction?
Which taxes qualify?
Can I carry unused credits?
Source & methodology
IRC §901/§904; Form 1116 instructions.
Foreign Tax Credit: what this tool answers
Gross figures are marketing; net figures are reality — this page computes the distance between them. Foreign Tax Credit is the kind of number people argue about from memory. This page ends that argument with arithmetic you can watch happen: enter your figures, get Credit allowed in real time, and see every substitution printed below.
What makes Foreign Tax Credit worth calculating is not precision but position: it tells you which side of a threshold you are on, and by how much. A rough figure that settles the direction beats an elaborate one that never commits.
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.
Every figure in the prose is generated by the engine rather than written beside it — the worked example resolves to credit allowed = $22,803 on the default inputs, and the sensitivity section ranks the inputs that move the result — Foreign tax paid on it first, at ≈10.0 % of the headline for a ten-percent error either way in that input. Work down the page and by the end you could re-derive the result in a spreadsheet from memory.
How Foreign Tax Credit is computed, line by line
One formula, published in full: Limitation = US tax × (foreign income ÷ worldwide income); excess credits carry 1-back/10-forward. Anything you can read, you can reproduce in a spreadsheet, and that reproducibility is the whole point of printing it rather than hiding it behind a button.
Foreign-source income ($) (example value 180,000) is a quantity rather than a category — precision here is cheap and worth having. 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 tax paid on it ($) (example value 22,803) is a quantity rather than a category — precision here is cheap and worth having. Replace the example with the figure from your own records — the tool recomputes instantly and the printed steps follow your numbers.
Total US tax before credits ($) (example value 58,228) is a quantity rather than a category — precision here is cheap and worth having. If you are unsure what belongs in this field, look at the printed steps: the substitution shows exactly how the engine uses it.
Total worldwide income ($) (example value 445,000) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Keep every money input in the same currency; mixing systems quietly corrupts the comparison.
Foreign Tax Credit with real numbers, step by step
Abstract formulas are hard to trust, so here is the complete substitution using the default inputs, written the way an examiner would want it. Starting figures: Foreign-source income ($), Foreign tax paid on it ($), Total US tax before credits ($), Total worldwide income ($). The computed credit allowed comes out at $22,803, which the interpretation band labels “Credit fully absorbs the foreign tax: US liability on this income is zero — the purpose of the mechanism”.
- Limitation = $58,228 × ($180,000 ÷ $445,000) = $23,553
- Paid $22,803 → credit $22,803, excess $0.00
- Excess carryforward or §275(a) election to deduct instead
Credit limitation — $23,553. If your inputs change, this is usually the first companion figure to move.
Excess credit — $0. This is the number experienced users quote when the headline alone would mislead.
Effective double-tax rate — 0.00%. Compare it against the main result of $22,803 before drawing conclusions.
Deduction alternative (worth) — $0. Compare it against the main result of $22,803 before drawing conclusions.
Keep this worked example open while you enter your own figures: matching the shape of the substitution is the fastest way to spot a unit or convention mistake.
How far Foreign Tax Credit can reasonably move
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?
| Foreign tax paid on it setting | Credit allowed |
|---|---|
| 80 % of the example value | $18,242 |
| 90 % of the example value | $20,523 |
| example inputs | $22,803 |
| 110 % of the example value | $23,553 |
| 120 % of the example value | $23,553 |
The corridor runs from $18,242 to $23,553 across that band — which is the range worth planning inside rather than the single $22,803 point estimate. Reproduce it in the form above by editing Foreign tax paid on it alone; the substitution steps will follow your figures exactly.
Sensitivity: which inputs change Foreign Tax Credit the most
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 credit allowed was recalculated from scratch. For Foreign Tax Credit the ranking is measured rather than guessed, and it belongs to these defaults: shift the starting point and the order can shift with it.
- Foreign tax paid on it: ten percent up gives $23,553, ten percent down gives $20,523 — ≈10.0 % of the credit allowed either way
- Foreign-source income: ten percent up gives $22,803, ten percent down gives $21,198 — ≈7.0 % of the credit allowed either way
- Total US tax before credits +10 % → Foreign Tax Credit = $22,803 · −10 % → $21,198 (the credit allowed shifts ≈7.0 %)
- Total worldwide income: ten percent up gives $21,412, ten percent down gives $22,803 — ≈6.1 % of the credit allowed either way
Foreign tax paid on it is the dominant lever here: ten percent either way moves the result by about 10.0 %, from $20,523 to $23,553. That is where a careless figure does the most damage, so check it against a source, and treat Foreign-source income as the second priority (≈7.0 % 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.
Interpreting the Foreign Tax Credit verdict
Nobody acts on a bare figure — they act on a figure with a comparison attached. The verdict attached to the default calculation — “Credit fully absorbs the foreign tax: US liability on this income is zero — the purpose of the mechanism” — is one band on a ladder your own figure may sit somewhere else on. Before treating the band as fact, note its width: ten percent either way on Foreign tax paid on it already spans $20,523 to $23,553. The practical reading rules: ask what would have to change to move you one band. If the answer is “a small, plausible input difference”, the band itself is not the finding — the uncertainty is.
Set Foreign Tax Credit beside its neighbours and it usually plays a specific role: this figure establishes the size of something, and the neighbouring tools establish whether that size is acceptable. Skipping the first step makes the second one arbitrary.
Common mistakes with Foreign Tax Credit (and the fix)
Basketing: general vs passive category limits apply — mixing passive income with business income strands credits if you skip Form 1116’s categories. 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.
Reading Foreign Tax Credit as a promise rather than a conditional. Every number here is of the form “if these inputs, then this result”; when an input moves, the honest response is to recompute rather than to defend the old figure.
One mistake is specific to this engine: assuming every input matters equally. The computation above shows Foreign tax paid on it dominating — a careful figure there beats false precision everywhere else.
Another is comparing across contexts: a Foreign Tax Credit computed with one set of conventions should never be lined up against a figure computed with another. Check the inputs behind both before ranking them.
Before you trust your Foreign Tax Credit: a short checklist
- Note the date and the inputs beside the number so the figure can be audited later.
- State, in one sentence, which convention each rate, unit or period in the form is using.
- Put Foreign tax paid on it under a magnifier; the sensitivity table above is the reason why.
- Verify each input against its original source document, not memory.
- Recompute once with the dominant input deliberately set low, and see whether the decision changes.
- Repeat the ±10 % test on the inputs that matter and see whether the decision — not just the number — still holds.
Step by step: getting a trustworthy Foreign Tax Credit out of this tool
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 — collect, then type. Everything this tool asks for is listed above (foreign-source income ($), foreign tax paid on it ($), total us tax before credits ($), total worldwide income ($)). Pull each figure from something you can point at — paperwork, a dashboard, a label — before touching a field. Guesswork at the input stage cannot be repaired at the interpretation stage. One decimal place more than your data supports is one decimal place of fiction.
Step 2 — baseline before exploration. Get one defensible Credit allowed on screen before you start nudging numbers. Without a baseline, every variation looks interesting and none of them means anything. Most surprises in numbers are surprises about inputs, not about formulas.
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. A figure nobody can reproduce is a figure nobody will act on twice.
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. The point of transparency is that a reader can disagree with a specific line rather than with you.
Step 5 — write the one-line memo. “Credit allowed = $22,803 on this date, from these inputs.” That line is the entire deliverable; everything else on this page is how you earned the right to write it. Numbers are cheap to produce and expensive to retract; the extra minute is the cheapest insurance available.
Where Foreign Tax Credit matters in practice
Numbers earn their keep in conversations, and Foreign Tax Credit is no exception. In Finance & Banking discussions around Currency & International, 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. Numbers are cheap to produce and expensive to retract; the extra minute is the cheapest insurance available.
The companion outputs — Credit limitation and Excess credit — 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. The test of a good estimate is not that it feels right but that it changes what you do.
Treat Foreign Tax Credit like a smoke alarm rather than a painting — its value is in being tested periodically, not in being admired once. Note the assumption you are least sure about; that is where the real risk lives.
The questions that come up most about Foreign Tax Credit
What affects Foreign Tax Credit the most?
Foreign Tax Credit is driven above all by Foreign tax paid on it. Perturbing only that field by ten percent either way produced $23,553 against the $22,803 baseline — a ≈10.0 % response, while Foreign-source income manages ≈7.0 %.
Which matters more: foreign-source income or foreign tax paid on it?
For Foreign Tax Credit, Foreign tax paid on it wins the head-to-head (≈10.0 % against ≈7.0 % per ten-percent change). Knowing which input dominates is the difference between careful work and merely slow work.
What is a typical Foreign Tax Credit?
With the example inputs on this page the result is $22,803, labelled “Credit fully absorbs the foreign tax: US liability on this income is zero — the purpose of the mechanism”. “Typical” varies with situation, which is why every result here ships with its verdict band and its sensitivity list: they turn one figure into a range you can locate yourself inside.
How do I calculate Foreign Tax Credit by hand?
Use the stated model — Limitation = US tax × (foreign income ÷ worldwide income); excess credits carry 1-back/10-forward — and substitute in the order the tool prints (it starts from Limitation = $58,228 × ($180,000 ÷ $445,000) = $23,553). On the example inputs the hand route lands on $22,803, exactly what the calculator shows. A spreadsheet reproduces it in two or three cells; doing it once by hand is what makes the automated answer trustworthy.
What happens to Foreign Tax Credit if foreign tax paid on it changes by 10 %?
The engine was re-run with that field moved by ten percent while everything else stayed fixed: the credit allowed goes across $20,523 to $23,553, a swing of roughly 10.0 % around the $22,803 baseline. That ratio is the practical definition of how much this input matters.
Is the Foreign Tax Credit result of $22,803 good or bad?
Good and bad are comparisons, so the honest test is three questions: where does your own Foreign Tax Credit sit against the $22,803 reference above, how far would a plausible input error move it (≈10.0 % per ten percent on Foreign tax paid on it), and what does the alternative option compute to?
How do I calculate Foreign Tax Credit manually?
Write down the inputs, then follow the printed steps in order — Limitation = US tax × (foreign income ÷ worldwide income); excess credits carry 1-back/10-forward. A spreadsheet replicates it with two or three cells. The manual route is worth doing once to build intuition; after that the calculator saves time and eliminates transcription slips.
What affects Foreign Tax Credit the most?
Sensitivity depends on where you start, but the inputs Foreign-source income ($) and Foreign tax paid on it ($) typically move Foreign Tax Credit further than the rest because they enter the formula multiplicatively. If you can only measure two things well, measure those and hold the others at conservative defaults.
Credit or deduction?
Credit is almost always better unless foreign tax vastly exceeds US on that income — run both.
Which taxes qualify?
Income-type, legally imposed, actually paid, to a recognized authority — VAT and social usually do not.
Is my data private on this page?
Yes — computation happens locally in your browser, with no account, no tracking of your inputs and nothing sent to a server. The printed formula is the whole story of what happens to your figures.
Glossary for Foreign Tax Credit
- Credit limitation
- $23,553 in the default Foreign Tax Credit calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Excess credit
- $0 for the Foreign Tax Credit worked case; it sits next to the main result because it carries context the headline leaves out.
- Effective double-tax rate
- 0.00% for the Foreign Tax Credit worked case; it sits next to the main result because it carries context the headline leaves out.
- Credit allowed
- The primary output of this tool: $22,803 for the default inputs, computed exactly from Limitation = US tax × (foreign income ÷ worldwide income); excess credits carry 1-back/10-forward.
- Worked example
- The calculation written out in full so that nothing on this page has to be taken on trust.
- Verdict band
- The interpretation attached to a result (“Credit fully absorbs the foreign tax: US liability on this income is zero — the purpose of the mechanism” on these inputs), which turns a bare number into a position on a scale.
- Sensitivity (±10 %)
- How far the Foreign Tax Credit moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Where the Foreign Tax Credit model comes from
Everything above runs on one stated formula, applied without hidden coefficients: Limitation = US tax × (foreign income ÷ worldwide income); excess credits carry 1-back/10-forward. Source of record: IRC §901/§904; Form 1116 instructions. Specialist software layers extra coefficients on top of the same algebra; none are hidden here, and that transparency is what makes a disagreement traceable to a specific input instead of a black box.
Treat the output as a precise answer to the question you typed: exact arithmetic, transparent formula, published source, no hidden rounding. The design constraint was set by usefulness rather than by comfort: an estimate you can interrogate beats an answer you have to trust.
After the number: what to do with it
Compare offers on the computed net figure, never on the headline — two equal salaries rarely produce equal money.
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.