You will have to wait for the IRS to see if your return is accepted or rejected as noted below.
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Accepted Return: You can add it by completing an amended return if you have already filed your return and the IRS has accepted it.
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Rejected Return: If your return has been rejected, you can add that to your return before you resend it a second time.
If the return does receive acceptance then an amended return is required to add your parent. Follow the steps below to amend your return. This amendment is not allowed to be e-filed and must be mailed. You can find the address for your are by using the link here. Where to File Paper Returns With or Without a
Payment
https://ttlc.intuit.com/replies/3288565
If your state return should also be amended you can find the address by selecting your state below.
https://ttlc.intuit.com/replies/3302452
