Delete a Tax Code
Do NOT delete a tax code that still has customers or orders assigned to it, or that was used in the past. Tax Codes should only be deleted if they were never used on any orders or invoices.
1.Select File > Customer > Tax.
2.Enter the tax code that you would like to delete in the Tax Code field and press Tab, or use the 
to search for the correct code.
3. Click the Edit button, and then the Delete button in the bottom toolbar.
4. The system will ask if you are sure that you want to delete the tax code. Click OK in this window. This will delete the tax code from the system.