Do you charge sales tax on the complete bill when there are parts and labor in Florida?

This is a situation where you have to be very careful. If you list on your invoice one amount for new alternator and list a price of $250, then you will have to collect sales tax on the entire amount. If, however, you list on your invoice New Alternator $150 and Labor to Install $100 then you will only collect and pay sales tax on the $150 for the Parts and not sales tax on the labor. This must be done at the time that the invoice is given to the customer and you can't have one for you and one for the customer. You must divide the charges for parts and labor on the invoice in order to not be liable for the entire amount of the service.