How do I file an IRS extension (Form 4868)?
For most TurboTax Online customers, the deadline to file a federal extension was on April 18. However, if you're stationed outside of the U.S. with an AE, AP, or AA military address, you have until June 18 to file your extension with the IRS.
You can do this by clicking My TurboTax at upper left, then choosing Easy Extension (on mobile devices, tap the upper-left corner to open the side menu, then tap Easy Extension). You can also file your extension at our Easy Extension website.