Free Tax Residency Tools
Six free calculators for multi-state taxpayers, digital nomads, and anyone trying to answer a simple question: “Do I owe state tax here?” No login, no email gate, no catch.
183-Day State Residency Calculator
Enter your days per state and see in real time which state residency thresholds you are approaching or exceeding.
Open toolState Tax Savings Calculator
Estimate how much you could save in state income tax by moving from one state to another.
Open toolResidency Audit Risk Score
Answer 14 questions to get a personalized score showing how exposed you are to a state residency audit.
Open toolResidency Change Checklist
Get a customized, printable checklist of every step you need to take when changing state residency.
Open toolSubstantial Presence Test Calculator
Run the IRS 3-year weighted formula to see whether you meet the Substantial Presence Test.
Open toolState Residency Rules Quick Lookup
Instant residency rules for every state: thresholds, abode requirements, and audit exposure.
Open toolBuilt by iReside
These free tools are powered by the same tax residency data that drives iReside, the iOS app that tracks your state residency days automatically via GPS. The tools help you understand the rules. The app helps you follow them — every day, in the background, with zero manual effort.
Track your days automatically
Stop counting manually. iReside uses GPS to log your state every day in the background. Get alerts before you hit thresholds. Generate audit-ready reports with one click.
Free trial. $34.99/year. No credit card required.