If the IRS rejects it, you can correct and retransmit it at free of cost. In case, the IRS rejects your return and now it is past the filing due date, you are given 5 calendar days to correct and retransmit it to still considered timely filed.
Here's how you can correct and retransmit your rejected extension:
Once you transmit, we'll keep you informed on the return status when we hear back from the IRS. For any further assistance, we recommend contacting the IRS EIN Hotline at 1-800-829-4933.