establish Florida residency. File final part year state return. Federal law prohibits the old state from taxing retirement income at that point.
4 U.S. Code SS 114 - Limitation on State income taxation of certain pension income | U.S. Code | US Law | LII / Legal Information Institute
Trump filed this but it is not controlling.
https://www.clerk.org/pdf/DeclarationOfDomicile.pdf
4 U.S. Code § 114 - Limitation on State income taxation of certain pension income
U.S. Code
Notes
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(a) No State may impose an income tax on any retirement income of an individual who is not a resident or domiciliary of such State (as determined under the laws of such State)….
Residency Income Tax Requirements | Determining Domiciles
No single factor is dispositive in determining domicile; rather the factors are examined by the Department collectively to determine if the intent to acquire or abandon Virginia domicile exists. It is noteworthy, however, that the fact that a person who has moved outside of Virginia yet returns to the state to live within six months constitutes prima facie evidence that no intent to abandon Virginia domicile existed.