What date does turbo tax stop working for tax year 2021?

[NCperson]

@rsw454 Assume Oct 18, 2022 which is the day after the extended deadline.  

[Critter-3]

The online program will continue to work until Saturday 10/23/22 for the returns that need to be  fixed & refiled after a rejection on Monday 10/17/22 ( the 5 day "perfection" period)  however you will not be able to start new returns after 10/17/22.  To start a new return you will have to use the downloaded program and mail in the return.