Tax on Sales/Purchases for Down Payments 
In the SAP system, down payments are posted to special reconciliation accounts (special G/L accounts). For more information on special G/L transactions and down payments, see Special G/L Transactions in the Accounts Receivable and Accounts Payable documentation. The following section describes how the tax on sales/purchases is to be dealt with for down payments.
Depending on the legal specifications of your country, you may or may not have to post tax on down payments. If you generally do not have to post tax on down payments, you can suppress the tax fields via the special G/L account (down payment account) as follows:
You can create the master records with an account group for which the Tax Category field does not appear. You cannot then fill the field when you create the master record.
You achieve the same by leaving the Tax Category field in the master record blank. By doing this, all fields on tax are suppressed in the entry screens. For more information on the screen layout, see Master Data in the Accounts Receivable and Accounts Payable documentation.
See also: