It goes unnoticed.
Alabama has one of the most complicated local sales tax structures in the country — city, county, and police jurisdiction rates that vary block by block. Vendors get it wrong often, usually by charging a flat rate or going off your ZIP code instead of your exact address. When they charge too much, there's no letter, no notice, no flag on your return. The extra money just leaves your account and stays with the state. The only way to catch it is to look.
