There is no need to start a new tax return if all you need to change is the amounts in column 2 of the What-If worksheet.
Sorry, there is not a guide for the worksheet.
You can enter any amount you wish in column 2. You can also copy from column 1 to column 2 or to the other columns. Look at the top of the worksheet for copy, add and subtract.
If you want to use the 2023 tax rates in columns 2, 3 or 4 check the box for the 2023 tax rates.
