You would have to compare your income amounts by source between the two years to see what changed. I suggest you compare each income entry on page one of your Form 1040, line by line, with the same entry in the previous year and then investigate further the entries that changed significantly.
To view your form 1040 and schedule 1 to 3:
- Choose Tax Tools from your left menu bar in TurboTax Online
- Choose Tools
- Choose View Tax Summary
- See the Preview my 1040 option in the left menu bar and click on it
- Choose the Back option in the left menu bar when you are done
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