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Quinn Moranleft a comment
I moved between states and realized I had no reliable way to prove where I'd been if an auditor ever asked. Spreadsheets are unreliable. Memory is worse. The apps that existed cost a fortune or didn't work well. So I built iReside automatic, affordable, and accurate. Your phone already knows where you are. iReside turns that into tax compliance you don't have to think about.
iResideTax Residency Tracker