You are trying to recalculate tax on the invoice in the AvaTax.
- Click on the down arrow to your Transactions.
- Select your transactions.
- Edit your line item by going to the line and clicking on the pencil at the end of the line.
- Once you have made your changes, then click on "Save Line Item"
- Then you should be able to click on "Blue % Calculate Tax" sign above the Line Item which will generate a tax calculation.
- Remember to click on Save and Commit to save the new tax calculation.