Configure Sage 1. Configure Sage: To configure Sage so that entering the amount excluding tax automatically completes the other lines (VAT, including tax, etc.), you can adjust the settings in the item configuration or in the general accounting settings. 2. Configure purchase entry Here are some general steps to check in Sage (depending on the version you are using): Default VAT code: In the supplier or item record, make sure a VAT rate is defined. Automatic calculation of including tax: In the entry settings or the entry template, there may be an option to "automatically calculate the including tax from the excluding tax." Entry template: If you use entry templates for purchases, you can configure them to interpret the excluding tax fields and generate the rest. Chart of accounts: Check that the VAT and including tax accounts are linked to the correct general ledger accounts. User Preferences: Some settings can be defined per user—including the entry method (excluding/including VAT). 3. Where to look in Sage? Settings menu > Entry > Entry options Files menu > Items/Suppliers > Default VAT Accounting settings > Journals > Entry templates