After you file

Yes, if you filed your 2019 return incorrectly, you can file an amended (1040X) return in TurboTax.  Here is how:

In order to file an amended return, make sure that your 2019 return was accepted in TurboTax Online or paper-filed through the mail by the IRS.

To prepare an amended return through TurboTax, follow these steps:

1. Sign in to TurboTax.
2. Scroll down to Your tax return & documents (you may need to select Show), select 2019 and then Amend (change) return.
3. Select Amend using TurboTax Online.
4. Carefully follow the instructions. Don't worry if your refund changes to $0. This is normal on amended returns.
5. When finished, we'll give you instructions for printing and mailing your amended return as amendments can't be e-filed.

Here is a chart from IRS Publication 501, for more information on claiming dependents.