There is no penalty if you are getting refund; if you are getting a refund you have three years to file and still receive the refund without penalty. But e-filing will close permanently for 2024 returns after October 15, so if you miss that deadline, you will need to file by mail.
**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.**
