The law gives taxpayers three years to submit a return and claim a refund. Generally, the three-year countdown starts on the on the original due date of the return unless extended. in your case unless extended the original due date was 4/15/2020 which means if wasn't extended it is now too late to get the refund. (4/15/2023 was the deadline). if extended then you have until 10/15/2023 to file.
