It depends. If you are only in Alabama to attend school, and are planning on returning to Florida when you finish school, your time in Alabama is considered a temporary absence. Technically, you are still a Florida resident.
The difference in the tax treatment is only on the state return, which requires you to file as a nonresident for any income you earn in Alabama as compared to a part-year resident return. However, if you did truly move to Alabama, then you will use the date you moved into Alabama as the date you became a resident.
In either case, Florida has no state tax return, so none of your income would be taxable to Florida. As mentioned previously, your Federal return is unaffected by this information.
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