If the return is rejected by the IRS you can make the corrections and refile your return.
If the return was accepted by the IRS then you will have to file an amended tax return using Form 1040X to make the required corrections.
The FAQ link below provides
information on how to amend your tax return. Please note that the IRS has
not released the 2018 Form 1040X. This link will be updated when the IRS
has released Form 1040X
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
Instructions for amending your 2018 tax return will be available after the IRS releases the current Form 1040X.
If the return is rejected by the IRS you can make the corrections and refile your return.
If the return was accepted by the IRS then you will have to file an amended tax return using Form 1040X to make the required corrections.
The FAQ link below provides
information on how to amend your tax return. Please note that the IRS has
not released the 2018 Form 1040X. This link will be updated when the IRS
has released Form 1040X
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
Instructions for amending your 2018 tax return will be available after the IRS releases the current Form 1040X.