09/25/2026
October 15 is the last date on the calendar. There is no second extension behind it.
Miss it and you are paying:
Failure to file, 5% of the unpaid tax per month, capped at 25%
Failure to pay, a separate penalty that started in April
Interest compounding daily on both
Every business owner who files on time pays none of that. Same return, same numbers, very different cost.
Comment AUDIT and we will tell you where you stand.