The move changes the rate; the record decides whether it sticks. Louisiana keeps taxing until domicile actually changes, and its 183-day statutory test stays live while any Louisiana abode is maintained. Below: what follows leavers, and the Texas steps that build the record.
183 days · see day-counting rules
No test
IT-540B (part-year)
No income tax return
At Louisiana's top marginal rate (3%), every $100,000 of taxable income is $3,000 of state tax — an illustration at the top bracket, not an effective-rate calculation. Official rate tables are linked below.