If your LLC is organized as a partnership or S-Corporation, you need to file Form 7004, which can be found in the TurboTax Business product. You can visit the following link to purchase the program: TurboTax Business.  

If your LLC is organized as a sole-proprietorship, filing a Schedule C with your 1040, you can file an extension of your 1040 by using these steps:

TurboTax Online

1. In your return, type extension in the Search box at the top of the page.
2. Click the Jump to extension link
3. On the Need More Time to File Your Return? screen, click on the blue box, Start Easy Extension.
4. Click Continue in the pop-up window.
5. On the next screen click the File an Extension box.
6. Continue through the screens, entering the requested information.

TurboTax CD/Download

You cannot e-file an extension from the TurboTax CD/Download editions.  You can print out Form 4868 and mail it in. To do this

1. Click Federal Taxes >  Other Tax Situations
2. Under Other Tax Forms, click the Start/Update box next to File an Extension.
3. On the next screen, mark the Yes radio button and click Continue.
4. Continue through the screens until you reach the screen, Your Extension Results.  Click the Print Extension box.

You can also go to the TurboTax Easy Extension website to file your extension online:

1. Go to:  https://turbotax.intuit.com/irs-tax-extensions/
2. Click the File a Free Extension box. 

You will be asked to sign in with your TurboTax Online ID.  If you don't have one, click Create an Account at the bottom of the sign in screen.