How to Clear Tax History on Sage 300 Steps: Open Common Services > Tax Services > Tax Periodic Processing > Clear History.Specify the range of tax authorities for which to clear transactions.Specify whether to clear transactions by fiscal year / period or document date, and then enter a range of fiscal periods or document dates.Select types of transactions to clear:SalesPurchasesNote: You can select any or all types of transactions.Click Process, and then click Close. Sage 300 Request Support