To calculate the amount of tax on an Item's purchase or sale, a Tax entry has to be selected on the invoice row.
Auto Set Tax
If the Tax has been set on the Item then it will be auto set in the invoice row.
Tax entries can be made from the Tax page:
Setup > Taxes
A Tax entry has just two fields
- Tax Name: a unique name to identify the tax by.
- Tax Detail: a table where the Tax account along with the Tax rate is set.
Tax Detail is a table as a single tax can have multiple components each with a separate account and rate.