The move changes the rate; the record decides whether it sticks. Utah keeps taxing until domicile actually changes, and its 183-day statutory test stays live while any Utah abode is maintained. Below: what follows leavers, and the Texas steps that build the record.
183 days · see day-counting rules
No test
TC-40B (part-year)
No income tax return
At Utah'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.