Effective tax rate comparison by corridor — free calculator
Shows the combined effective rate across two countries once credit relief is applied, which is rarely the sum of the two rates.
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Shows the combined effective rate across two countries once credit relief is applied, which is rarely the sum of the two rates.
Enter your figures
An estimate for planning only. Rates and thresholds used here are the assumptions stated on this page; we confirm every figure against the issuing authority for your own tax year before anything is filed.
How the estimate is built
Under the credit method the residence country taxes the income and allows the source tax against its own, so the effective rate is the higher of the two and a lower source rate produces no saving. Under an exemption article the residence country does not tax at all, and the source rate is the whole cost. Which applies depends on the specific treaty and income type, which is why the relief article is read rather than assumed.
Where to go from here
A calculator narrows the range; it does not settle a filing. If you already have an adviser, we will tell you what they should be asking rather than replacing them.
Reviewed against current guidance for the 2025 and 2026 filing seasons by Udit Gupta, Cross-Border Tax Expert, Legal Quotient Consultants. This is general information rather than advice about your file — a short call is the way to get the second.
What's the tax rate, in practice
The search that brings most people to this page is what's the tax rate. It is answered here for effective tax rate comparison by corridor: what creates the obligation, which filings discharge it, and the fee agreed before the work starts.
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Cross-border tax case studies
Modelling a secondment package before the assignment letter was signed
An employer wanted to know what an assignment would cost once both countries had taxed the package. We identified the treaty articles covering the employment income and the relief method the residence country applied to it, then modelled the combined outcome against the alternative of a locally employed hire. The engagement produced a written comparison of both structures, a note of the assumptions behind each figure, and an assignment letter drafted so the tax treatment matched the way the arrangement was actually documented.
A dividend stream where the relief article differed from the employment one
A client assumed the treatment applied to their salary in a corridor also governed dividends from a company in the same country. The treaty did not work that way. We read each article against the income it governed, established the relief method for each, and rebuilt the combined rate separately for the two streams. The engagement produced a corrected position for the dividend income, an amended claim for the years affected, and a short guide to which article governs which receipt.
Excess source tax that no credit in the residence country could absorb
Tax withheld at source exceeded what the residence country charged on the same income, and the client expected the difference back on their residence-country return. We explained why the credit stopped at the residence-country charge, checked whether the amount withheld was more than the treaty permitted, and pursued the remedy where it lay. The engagement produced a reclaim filed in the source country, a documented credit computation at home, and a procedure for claiming treaty rates at source in future years.
Comparing two corridors for the same consulting contract
A consultant could perform the same contract from either of two countries and asked which cost less in tax. We read the relief mechanism in each corridor, applied it to the contract's income type rather than to income generally, and set out the combined outcome under both. The difference came from the relief method, not from the headline rates. The engagement produced a written comparison, the treaty references relied on, and the non-tax conditions that would have to be true for either result to hold.
A residence country that exempted one income type and credited another
A client with both employment income and income from property in the same source country had applied one relief method to everything. The treaty exempted one and credited the other. We separated the streams, applied the correct article to each, and recalculated the combined effective cost. The engagement produced a revised return for the open years, a schedule showing each income type against its governing article, and a filing template that keeps the two streams separate going forward.
Testing whether restructuring for a lower source rate was worth doing
A proposal promised a reduced rate of withholding at source, and the client wanted to know what it would save. Because the residence country gave a credit, the lower source tax reduced the credit and left the total unchanged. We modelled it both ways and set out the narrow circumstances in which the saving would have been real. The engagement produced a written recommendation not to restructure, with the arithmetic and the treaty article behind it recorded on the file.
A US Citizen Settled in India, Filing on Both Sides
Residence in India and citizenship in the United States produce two annual returns for one income. The order decides the credit, and the Indian financial year and the US calendar year have to be reconciled before either is prepared.
Read how this one runsThe Year of Leaving India
The departure year carries a transition status with its own treatment of foreign income, and the position for the following years follows from how it is set. Getting the first year right saves arguing about the rest.
Read how this one runsAll case studies — every published engagement in one place.
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