Withholding Tax Calculator

This calculator works out how much tax gets withheld on a cross-border payment — dividends, interest, or royalties — and what that costs both parties over a year. The core logic is simple: if a bilateral tax treaty exists between the payer's and recipient's countries, the calculator applies the lower of the domestic statutory rate and the treaty-reduced rate (treaties exist specifically to cap withholding below the domestic default, commonly cutting a 30% US statutory rate down to 15% or less under many treaties), otherwise it applies the full domestic rate. From that effective rate, it computes the tax withheld per payment and the net amount the recipient actually receives, then extrapolates both across however many payments occur per year (e.g., 4 for quarterly dividends).

If you flag "gross-up required" — meaning the payer has contractually agreed the recipient should receive the full intended amount net of tax, a common term in loan agreements — the calculator uses the standard gross-up formula, Gross = Net ÷ (1 − WHT%), to compute the extra amount the payer must add on top of the stated payment so the recipient still nets the original figure after withholding. It separately reports the annual tax savings the treaty rate provides versus the domestic rate, and applies a foreign tax credit percentage — how much of the withheld tax the recipient can credit against home-country tax liability — to arrive at a net tax cost after credit and an effective tax cost as a percentage of gross payments. Keep in mind this models a single flat rate per payment type; real treaties often carve out different rates by ownership percentage (portfolio vs. direct-investment dividends) or payment sub-type, and foreign tax credit usability depends on the recipient's home-country rules and overall tax position, not just the withheld amount.