If you have already e-filed or mailed the return, you will need to wait until the IRS has accepted or rejected that return before you can make any changes.
- If they reject it, you just make the needed changes and re-submit the return.
- If they accept it, you will need to wait until you have received your refund and then amend that return to make changes, if needed.
If you have to amend, you can find amend instructions here How do I amend a 2017 return in TurboTax?
And amended returns have to be printed and mailed in and can take up to 16 weeks to be processed.
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