Moving out of Ohio is easy. Stopping Ohio taxes is a different act, and it happens on paper: Ohio keeps treating you as a resident until the record shows otherwise.
On the burden of showing otherwise: On the individual contesting the statutory presumption of Ohio domicile: a preponderance of the evidence with fewer than 213 contact periods, clear and convincing evidence at 213 or more.
There is no day-count to get under. Ohio has no 183-day statutory-residency test. ORC 5747.24 instead counts contact periods: an individual has one contact period when away overnight from an abode located outside Ohio while spending any portion, however minimal, of each of two consecutive days in Ohio. Layered presumptions attach to the count — including an irrebuttable nonresidency presumption for filers of the Ohio Nonresident Statement. That makes the evidence trail — where the pattern of an actual life points — the entire case. Everything on this page exists to answer one question: if ODT asks, does your record hold?