Tax Functions will enable you to calculate Federal Income Tax, Capital Gains Tax and Self-employment Income Tax directly in a Sheet. Available for years 2020 - 2026 and all filing statuses. Launch the extension from the menu bar and begin by entering a tax function in a Sheet cell.  Auto complete will be available to provide assistance.  

Launching the extension will open a sidebar.  A sample sheet is available from the sidebar that demonstrates the usage of Tax Functions. More info about the functions and their parameters are also from the sidebar.  Menu Bar / Extensions / Tax Functions/ Launch