An extension gives you until October 15, 2024 to file your taxes instead of the tax deadline of April 15, 2024. You must file an extension by April 15, 2024 to get extra time to file your taxes without a penalty. There's no further extension past October 15, 2024.
An extension does not give you extra time to pay your taxes, which are due on April 15, 2024. Even if you can't pay your taxes by the deadline, file an extension anyway so you can avoid the late-filing penalty.
You can file your extension at our Easy Extension website, or select your situation for detailed steps.
For state tax extensions, see How do I file an extension for my personal state taxes?