It says I filed my taxes, but I didn't because I didn't have 2017 AGI. I have paid the money I owe through the IRS. I want to file an extension but it won't let me.

[nlfasules]

I printed it out and was going to mail but couldn't get to a post office on time.  Help. How can I still file an extension.  Been on hold for over an hour.

[DDollar]

If you paid the IRS online at IRS.gov, you don't need to file an extension if you indicated you were making an extension payment.  When you make such a payment, the IRS considers that as filing an extension.