How do i get this app to automatically add the tax?

[MarySharpDavis]

How do i get my square reader to automatically figure in the taxes?

[VanKalkerFarms]

You'll need to set up your tax in the Items section of your Dashboard on the Taxes tab. https://squareup.com/dashboard/items/taxes If you have individual items set up, be sure that the toggle is on for each taxable item.