Tax Base (tax entry method)
This is the amount (before included taxes) used as the base for calculating tax for each tax authority.
If you select Calculate, you cannot change the tax base.
If you select Enter or Distribute as the tax entry method for the Tax Base, you can enter the amount on which tax is based for the document. If you select Calculate as the entry method for the tax amount, and select Distribute or Enter for the tax base, the program uses the tax base you enter to calculate the tax amounts automatically.