Background: I have been told that you can save an "alternate version" of your tax return by duplicating the tax return that you have already filed. In other words, suppose I e-filed my 2023 tax return using the online TT on Feb 20, 2024. The return was accepted by both the Federal and State tax authorities where I live. On July 10, 2024, I had an unforseen taxable event. My tax return for 2024 will probably be similar to 2023 except for this large increase in my taxable income.
Question: Could I use a duplicate version of '23 return and add this additional income to get a reasonable estimation of the tax increase?
