hello. My name is***** can help you with your question.
You have not mentioned what registry you have that you are programming, but there are sometimes other settings for example a minimum taxable amount, or taxable and nontaxable departments. So you have to make sure that all these are set up correctly in order to calculate and charge taxes on the right items. If you could please provide me with the model number of your register, I can give you more specific information.
Please go to the department settings, and then check taxable status. Make sure it is set to 1&2.
The taxable status of the PLU must also be taxable.