How to apply a header-level discount to a transaction in NetSuite SuiteTax with taxes from Tax Determination.

1. Go to Transactions > Sales > Enter Sales Orders > List.
2. Click Edit in the row of the sales order you want to apply the discount to.
3. On the Items tab, select a discount from the Discount Item dropdown.
   The Rate field will autopopulate.
4. Click Save.
5. Check the total tax amount in the Summary section.