Use this tab to connect tax codes to income types. You can connect only tax
codes of tax type Tax Withhold. When an income type is entered for a
customer invoice line, the tax withholding code connected to income type will be
automatically suggested. These tax codes will be automatically suggested only if
no valid tax-exempt exists and the selected delivery address of the customer is
subject to tax withholding. In order to enter default tax withholding codes, at
least one customer income type must have been defined.
If the Mandatory option is selected in the field Tax Withholding Code
in the Income Types window, it is always required to specify a tax
code for that income type. By entering the '%' symbol in the field Income
Type, you can specify that all income types are connected to the tax
withholding code.