I opted for an extension to file my 2019 federal IRS tax return to Oct 15th, 2020.
I went to the USPS office personally on Oct 15th, 2020 morning. Got the envelope weighed by a USPS person behind the counter and paid the amount of the USPS printed label specially printed out for this envelope.
On the envelope, I wrote the incorrect first number of the zip code to the IRS. Everything else was correct. The zip code had the full 5 digit zip code except the first number was wrong. The USPS sent returned the envelope to me with a label: Return to Sender: Insufficient address.
So this time I sent the IRS return by USPS via overnight delivery, which reached the IRS I enclosed a note to the IRS regarding this and also enclosed the original envelope that said: Return to Sender: Insufficient address. The USPS stamp label on the envelope shows the date Oct 15, 2020 and also the dollar amount of the postage.
For some reason, the USPS took over a month to return the envelope to me.
Will I be penalized for the late submission of my IRS federal tax return?
If yes, what would the dollar amount be?