Good news!
This year the Tax Due deadline is April 18th.
Additionally, you may set up a payment plan with the IRS to make payments on you Taxes Due.
To do so follow this article:
https://ttlc.intuit.com/replies/4678634
Extensions are Free, but the IRS requires payment on the Due Date.
To file for an Extension to File your Tax Return follow this article:
https://ttlc.intuit.com/replies/6002809
I hope this helps