Can I file for an extension for 2018 if my 2017 taxes haven't been filed?

[HelenaC]

Yes, you can. 

File an extension with TurboTax Easy Extension. You'll get an email confirmation.

You can also file an extension while in your TurboTax Online income tax return. See How do I file an IRS extension (Form 4868) in TurboTax Online?

See also Does an extension give me more time to pay my taxes? NO

Related information: Does an extension give me more time to pay my taxes?