If you've e-filed your return and Form 8862 was required, the IRS will most likely reject your return, and you can then submit Form 8862 when you re-transmit your return.
Please see the TurboTax Help article “E-file reject F1040-164-01: Form 8862 is missing from the tax return and it is required to be able t...” for guidance.
If you paper-filed your return and Form 8862 was required, you'll need to wait for the IRS to contact you to send in the form. Filing another return with Form 8862 attached, before the IRS contacts you, could cause serious delay in receiving your refund.
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