If you have already filed your tax return and it has been accepted by the IRS, you would need to file an amended return (Form 1040X) to make any changes.
If your return has not been accepted by the IRS, wait until it is either accepted or rejected before making any changes to your return.
- If the return ends up being rejected by
the IRS, then you will have an opportunity to make the corrections you
want to your tax return and resubmit it.
- If your return is accepted by the IRS, then
you must file an amended return to correct the error. Below is a link
with more information on filing an amended return in TurboTax. And note that amended
returns must be mailed as they cannot be e-filed.
https://ttlc.intuit.com/replies/3288565