For most Americans, the deadline to file their 2024 tax returns is April 15, 2025. However, if you obtain a valid tax extension, you have until October 15, 2025, to submit your return.

IRS.gov has a PDF version of Form 1040-X that you can fill out online, then download, print and send. Or you can amend your return electronically using tax software like TurboTax or H&R Block.