Officers were not aware the return was required to be filed electronically and filed a paper return which was marked received by the IRS on March 01, 2021. This was well before the May 17, 2021 deadline A letter from the IRS dated Oct 06, 2021, and postmarked Oct 19, 2021 was received that indicated the return was required to be filed electronically and returned the original return to us. That was the first indication there was a problem with the return as filed.The officers immediately contacted an accountant to provide the electronic filing for the return. Since the return was promptly completed and filed upon notice from the IRS, we ask that all penalties be waived due to reasonable cause.