You could get him an extension which would give him until October 15 to file. An extension does not give extra time to pay tax due but it gives extra time to get your documents together and prepare the tax forms. Does he expect to owe for 2021?
https://ttlc.intuit.com/community/extensions/help/how-do-i-file-an-irs-extension-form-4868-in-turbot...
If he is getting a refund or will not owe there is no penalty for filing past the deadline.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
