Why is my sales tax not showing up on my invoice even after I click the taxable icon?

Helllo there, allseasonslawnan.

This might be a browser-related concern. You can try using the Private window and check if the sales tax is showing. If it does, you can go back to the main browser and clear the cache. Lastly, you can try different browsers like Google Chrome, Internet Explorer and Mozilla Firefox. 

Drop a comment if you have other concerns.