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Calculation of Provisional Value-Added Tax 
Purpose
In Colombia, there is a special procedure for calculating input value-added tax (VAT) where it is not clear what the purchased goods (or services) will be used for exempt or excluded goods or not. This procedure is known in Colombia as transitorio.
Process Flow
With these tax codes, the system posts the net cost of the goods to an inventory account and the tax to a special account for provisional VAT. All provisional VAT is recorded in a single account.
To do this, you use the Additional List for Advance Return for Tax on Sales/Purchases report to look up what percentage of your sales amounts were posted using the appropriate tax codes (A1, A3, and A4).
To do this, you use the
Advance Return for Tax on Sales and Purchases report, entering the appropriate tax codes for provisional VAT.