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You can file an extension for your tax return using the instructions in this link: How do I file an IRS tax extension?
An extension gives you until October 15 to file your federal tax return. To avoid penalties, you can file the extension and pay any balance due by the April 15 deadline. The extension is only for filing your tax return.
The desktop versions of TurboTax do not support e-filing of the Form 4868. However, you can use this link to file an extension: Free federal tax extension is now available.