I already filed my 1040/540 (Calif). I reported zero total tax and both fed and Calif refunds (overpayments).
Later, I realized I had omitted some Other Income (IRD) and 1099-OID and
1099-B data.Those changes do increase both fed and Calif AGI and Item Deductions.
But I still have zero total tax and the same amount of refunds. Also, there was no fed or Calif withholding.
Should I file Forms 1040X/540X in order to document the changes, even though there is no change to total tax and refunds?
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In a previous discussion of just the missing IRD income, Alan Kalman agreed that no amended returns are needed.
But I wonder if the missing 1099 data change the answer because the IRS and FTB have a record of them and might notice their omission.
I hope the IRS and FTB would realize there is no net effect, so they would not even send me a notice, much less require amended forms.