You can allocate a Tax code to an account in the Details view of the Edit Accounts window. You can display this window by going to theAccounts command centre, clicking Accounts List and clicking the zoom arrow () next to the required account in the list.
Make sure you select the Use Customer’s Tax Code option. (If this option is not selected, the customer’s Tax code will not be used, even if one has been assigned.)
Make sure you select the Use Supplier’s Tax Code option. (If this option is not selected, the supplier’s Tax code will not be used, even if one has been assigned.