[tbirdz]

You don't have to make an estimated tax payment. You can also file an extension, and when you do that you can make a payment with IRS direct pay as well. Also just because you filed for an extension, that doesn't mean you have to file your tax return later, so you can just file your tax return when you would regularly payment. You can file for an extension much later than Jan 15th, I think the deadline is sometime in April.