Free tools

Tax-residency calculators

Browser-based, privacy-first calculators for the most common tax-residency rules. No signup, no tracking, no data leaves your device.

International
Schengen 90/180 calculator
Rolling-window calculator for non-EU citizens in the Schengen Area. Days used, days remaining, and projected exhaustion date.
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US Federal
Substantial Presence Test calculator
IRS 3-year weighted formula for non-citizen US tax residency. 31-day current-year minimum + 183 weighted-day threshold.
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Generic
183-day rule calculator
Configure jurisdiction, threshold (183 / 184 / custom), and tax-year window. Works for any country or US state with a day-count rule.
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