I realize that July 17, 2023, is the last date to file a 2019 tax return in order for a taxpayer to get their 2019 refund.

However if a 2019 extension was filed is the three-year window tax filing deadline date extended to October 15, 2023?

In other words, what is the last date to file a 2019 tax return and not lose a taxpayer refund if a 2019 extension was filed?

Please let me know.

Thank you,

Anthony