Defining and using taxes in sql-ledger is a four step process:
Step 1: Define tax accounts in chart
You create (or edit) tax accounts in chart of accounts using System–Accounts menu option.
Step 2: Define tax percentages
You set percentages for each tax using System–Taxes menu option.
Step 3: Mark Items/services as taxable
You mark each part or service taxable during add or edit process. You do this using Goods & Services menu option.
Step 4: Mark customers/vendors for applicable taxes
Tax will not be calculated for your customers or vendors unless you mark them as taxable.