What if I notice that I made a mistake after I filed

[ohana-lani]

I may have reported the incorrect amount on state tax paid

[SweetieJean]

Unless you itemized, that will not affect your Federal return; and the state is likely to adjust that themselves on your State return.

[daraskavich]

What do I do if I made a mistake after I filed?

[daraskavich]

I made the mistake on my federal return

[DoninGA]

@daraskavich 

You will have to wait for the IRS to either Accept or Reject your filed federal tax return.
If the return is rejected you can make the necessary changes and e-file again.
If the return is accepted you will have to amend your original tax return. An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 12 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS