Legal, Tax & Compliance
Business Tax Receipt BTR
The local business licence, from the county and often the city as well.
Why you care
It is cheap, it is annual, and operating without it is a code violation that is trivially easy for anyone to report by looking at your listing.
Worked example
Typically $25–$150 a year per jurisdiction. Inside city limits you usually need both the city and the county one.
Taught in Florida Specifics