Same situation regarding our Adjusted Gross Income which was amended by the IRS through an account transcript after our returns were filed and of course linked to the FAFSA submission.
I contacted FAFSA to see how to go about amending our linked tax return but have been informed that is not possible. They advised to contact each Financial Aid office directly.
I’m not sure what if any impact this might have (it’s a $10,200 adjustment to AGI) and using revised numbers in the net cost calculators seemed to make no difference for us.
Nonetheless, just to be sure, I did send that account transcript along with an explanation to all the financial aid departments in the event it might have an impact on aid packages already provided but have yet to receive a any response beyond “received”.
You can get a downloadable copy of the account transcript showing the adjustment made by the IRS at the IRS website if you think it might be worthwhile. Good luck. Fun times.