Since you say he is going to file and say that he can be claimed on another tax return, you should add him back as a dependent on your return. I think you already did that if it is showing that you got the Other Dependent Credit for him ($500). Once he is back on your return, go through the filing status questions again to update your filing status to Head of Household. He has to be a dependent on your return in order to claim the HoH status. The situation you mention about him ''not being a dependent'' is the case in which you are qualified to claim him as a dependent, but you are giving his other parent a signed form 8332 (Dependent Release) so that the other parent can claim the Child Tax Credit and his dependency. In this case, you would not get the Other Dependent Credit, but you, as the custodial parent still retain the right to the Earned Income Credit and to the HoH status. But you mentioned nothing about the other parent claiming him, so you should add him back as a dependent and take the credit and the HoH status.
However, since you have already filed, you are going to have to wait until that return is processed, which it should be by the time the amendment Form 1040X is ready in TurboTax. The 1040X that is in there now is not up to date. One good thing about this year is that you can e-file the amendment this year instead of having to print, mail, and wait 16 weeks for the IRS to process it.
If your son changes his return to can be claimed, his return won't be rejected, and can re-submit his return. @anitaaustin
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