Moving out of Oklahoma is easy. Stopping Oklahoma taxes is a different act, and it happens on paper: Oklahoma keeps treating you as a resident until the record shows otherwise.
On the burden of showing otherwise: The Tax Commission lists the facts that presume continued Oklahoma residency — a homestead exemption, family in the state, an active driver license, intent to return, and failure to abandon the residence — so the record that displaces the presumption is supplied by the person claiming the change.
There is no day-count to get under. Oklahoma has no day-count residency test. An Oklahoma resident is a person domiciled in the state, and domicile is the place established as a person's true, fixed, and permanent home. A domicile, once established, remains until a new one is established — so there is no threshold to fall under, only a domicile to replace. 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 OTC asks, does your record hold?