You can go here https://turbotax.intuit.com/irs-tax-extensions/ to file a federal extension for your 2016 return. Keep in mind, filing an extension gives you until October 16 to file, but it doesn't give you until October to pay your taxes, if you owe. Those are still due by midnight, April 18.
And you can find details here below for how to file an extension for your state.
Other Related Topics:
- Does an extension give me more time to pay my taxes?
- Do I need to file an extension if I'm getting a refund?
- What if I can't pay my taxes?
- How do I finish up in TurboTax after filing an extension?