In order to add taxes to an invoice, first you need to set up your taxes. Here's a quick guide on how to do that.
Go To Payments
Navigate to the "Payments" tab.
Go To Tax Settings
Navigate to the "Tax Settings" tab.
Add A New Tax
Click "Add Tax".
Add A Tax Name
Click the "Name of the tax" field, and enter a name.
Add Tax Rate
Click the "Rate (%)" field, and enter a tax rate.
Add A Description
Optional: Click the "Description (optional)" field, and enter a description.
(Optional) Add Tax ID Number
Optional: Click the "Tax Id Number (optional)" field, and enter a Tax ID.
Save The Calendar
Click "Add Tax"