From the 2022 Federal Form 1040 Information Smart Worksheet displayed by View/Forms, it appears that Turbotax has erroneously copied the 2023 state and local real estate taxes (1040 Schedule A line 5b) into this worksheet. This may have happened because the line was blank on the 2022 form (because I had no real estate taxes to deduct in 2022). Now I need to figure out how to remove this bogus entry from the smart worksheet.
