One of our clients turned on the tax feature but it was not needed for their type of organization. As a result, their admin kept posting transactions with HST. Once you make the sales tax feature active you can not go back and make it inactive. You will have to use the Out of Scope code on each transaction. To avoid posting Out of Scope for each transaction follow these steps to set up the default tax code.
In the clog on the upper right hand corner, click on Account and Settings.
Click on the Advanced tab on the left hand side of your screen.
Click on the pencil in the Accounting section.
Change the Default Tax Rate Selection to Out of Scope.
This will automatically be the selection in the tax field of all sales and bill entries.