Consider a prospect wants to apply tax on a tax. Let's take an example tax (NBT) is to be applied on the net total amount of items and then apply another tax (VAT) on it. In the below example, tax NBT 2% is to be applied on sum of value of items, and then tax VAT 15%.

In TechoERP, to map this in the Sales Order/Invoice in the Sales Taxes and Charges table:

1. Select type of tax as On-Net Total
2. Select or add a new tax as NBT and set the rate at 2%.
3. Then add a new row and select the type of tax as On Previous Row Total and select or add new tax as VAT and set the rate at 15%.

Expand the 2nd row and add the Reference Row # to 1.

Once you save the document and see the print preview, it will look like the following.