| Transmission Information | Date |
|---|---|
| Begin Transmitting live IRS e-file returns | February 12, 2021 |
| Last date for transmitting timely filed returns | May 17, 2021 |
| Last date for transmitting timely filed Forms 4868 | May 17, 2021 |
| Last date for retransmitting rejected timely filed returns | May 22, 2021 |
| Last date for retransmitting rejected timely filed Forms 4868 | May 22, 2021 |
| Last date IRS will accept test transmissions | No cut-off date |
| Last date to submit new IRS e-file Applications | No cut-off date |
| Transmitting timely filed Forms 4868 or 2350 to meet overseas exception | June 15, 2021 |
| Retransmitting rejected timely filed Forms 4868 or 2350 to meet overseas exception | June 20, 2021 |
| Last date for transmitting returns on extension from Form 4868 | October 15, 2021 |
| Last date for retransmitting rejected late or returns on extension from Form 4868 | October 20, 2021 |