If I forgot to put a dependent on my taxes because we didn’t know that the other parent didn’t claim him. Is there any way we can get him claimed and put on my taxes

[xmasbaby0]

You cannot change or add anything on the return that you just e-filed, nor can you stop it.  It is too late, just like when you put an envelope in a US mailbox on the corner.  The IRS does not allow you to take it back.

If you left out a W-2, a 1099G, or a dependent, or a 1099 etc…DO NOT change your return while it is “pending.”  The changes will go nowhere.

Now you have to wait until the IRS either rejects or accepts your return.  If your return is rejected, you will be able to go into your account and make the necessary changes to your tax return and re-submit your return. 

Sometimes—not always— the IRS corrects your mistakes, while they are processing your return.

 If the IRS accepts your return, however, then you have to wait longer until it has been fully processed and you have received your refund.  THEN you can prepare an amended tax return and e-file or mail  it in. You have to be able to work from that return exactly the way it was when it was e-filed originally.  You will need to use a form called a 1040X.

  Meanwhile, DO NOT go in and start changing anything on your return in the system, or you will make a mess for yourself.  Sit tight and wait until you see what the IRS does with the return you just e-filed

The Form 1040X is scheduled to be available on February 26.   The date is subject to change, so check on 2-26  to see if it is ready.   Before that, do not change anything at all on your return.

[DoninGA]

If you have filed your 2025 tax return you will need to amend the return to add them as a dependent.

The Form 1040-X for amending a 2025 federal tax return is estimated to be available in TurboTax on 02/25/2026

You will have to wait for the IRS to either Accept or Reject your filed federal tax return.
If the return is rejected you can make the necessary changes and e-file again.
If the return is accepted you will have to amend your original tax return.  An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 20 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

See this TurboTax support FAQ for amending a current year tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-federal-tax-return-curr...

[DavidD66]

Yes.  If you have already filed you will have to file an amended return to add your dependent.  To amend a 2025 return in TurboTax, wait until the IRS accepts and fully processes your original return, then log in to your return in TurboTax and select "Amend (change) return" in the tax home   and follow the guided steps to create a Form 1040-X.   

To amend your tax return, please see this TurboTax article. 

Please note: The amendment form 1040X will not be available on TurboTax until after 2/19/2026.