This is exactly what I need. It is infuriating to spend all day typing all 2024 tax data (my 2025 data has very few changes, nearly identical) into tax year 2025 software package so I can do what-if for IRA to Roth back door conversion so I can estimate my income limits before I get whacked for going over the limits and watch my Medicare premiums for example, skyrocket higher because I had no way to evaluate otherwise. The tax laws changed for 2025 and I need to see the effect of last year's tax data on this year's 2025 taxes. The what-if feature in TT doesn't appear to provide this. It says in column 1 you will see this year's tax data - NO, I need to import last year's tax data, all income, etc., into a what-if for 2025.
