If you've already filled the return, you will have to do an amendment.
The April 15th deadline dose not apply
Wait for the original return to be completely processed.
TurboTax Online
- On the Tax Home screen, scroll down to Your tax returns & documents and select the year you want to amend.
- Select the Amend (change) return dropdown,
- Then Amend using TurboTax Online.
- If you're told to amend your return via TurboTax Desktop, follow the steps for TurboTax Desktop instead.
- Continue through the screens,
- Make the changes you need to make, and carefully answer the remaining questions to finish amending your return.
Go back into his tax return.
- Under My Info (Top of left sidebar)
- Click the down arrow next to his name
- Scroll down to add a dependent
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