After you file

Where do I mail my IRS extension form 4868?
 
Form 4868 Mailing Address
Mail your Form 4868 with tax payment Mail your Form 4868 without tax payment
Internal Revenue Service, P.O. Box 1302, Charlotte, NC 28201-1302 USA. Department of the Treasury, Internal Revenue Service Center, Austin, TX 73301-0045 USA. E-File from any Device E-File Now Instant IRS Approval

 

You can also file an extension online with TurboTax.

https://turbotax.intuit.com/lp/ppc/4265?

 

You can also mail in your extension without payment, then go online to pay taxes;

 

IRS payment options:

https://www.irs.gov/payments

If you owe State, go to your State’s website, to pay online.

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