Like 0708aggie said, the only guarantee would be to use the "reasonable cause" or one-time exception type of thing. For reasonable cause, you might get lucky this year blaming the Rona--who knows. But he is right in that the one-time exception thing you should save for when you really need it. Generally, they'll grant you a one-time exception every 5-10 years. If you have a history of filing timely since 1968, then it should be an easy exception to get.