The move changes the rate; the record decides whether it sticks. Oklahoma keeps taxing until domicile actually changes — domicile is the place established as a person's true, fixed, and permanent home; once established it remains until a new one is established, with no fixed day threshold to hide behind. Below: what follows leavers, and the Texas steps that build the record.
No fixed threshold — facts based
No test
511-NR (part-year)
No income tax return
At Oklahoma's top marginal rate (4.5%), every $100,000 of taxable income is $4,500 of state tax — an illustration at the top bracket, not an effective-rate calculation. Official rate tables are linked below.