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Posting Line Items Net of Sales/Purchases Tax 
Use
When you post documents in Financial Accounting (FI), you can enter them net or gross of sales/purchases tax. The system then calculates the tax accordingly.

Assume you want to issue a customer with an invoice for SGD 1,030, inclusive of SGD 30 tax, which would result in the following postings:

You could post the document using either the net approach or the gross approach. If you use the net approach, you enter SGD 1,000 in the G/L line item. The system then automatically calculates the tax by multiplying the dollar amount by the tax percentage rate (here, 3%) and fills out the tax line items and customer line items automatically. Using the gross approach, on the other hand, you enter SGD 1,030 in the customer line item. The system then calculates the tax by dividing 1,030 by (1 + 3%), and fills out the tax line items.
Prerequisites
Before you can enter line items net of tax, you must set up the user editing options accordingly. You can do so at user master level or at document level.
User Master Level
In the user master
editing options, select the following:The system will calculate tax using the net approach in all FI documents that this user posts.
This ensures that the system updates the customer or vendor line items based on the total amount of G/L line items.
Document Level
To activate the net approach only on the document level, proceed as follows:
editing options, select Propose final amount.Procedure
To post items net of taxes, follow the following procedure:

Leave the Amount field empty.
Net proposal.You will see that the tax amount is calculated as SGD 30.
