If you have already submitted your
return: if it gets rejected then
you can go in and make the necessary changes. If it is accepted, you will need
to amend your return.
The link below will take you to a guide with the
instructions on how to amend. The 2018 instructions will be added to this guide
once the IRS has released the current form 1040X.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
