You have a couple of options. As MaryK1101 said, you can go to the IRS website and make a payment. If this is for 2022 tax, you should indicate that it is an "Extension Payment". Making an extension an payment online will also file an extension for you, so if you need it, it will already be filed. Of course, you can file at any time, even if you filed an extension. You can also, print Form 4868, fill it out and mail it with a check. Or, you can file an extension online with TurboTax and make a payment when you e-file the extension. The Extension function in TurboTax is not yet available, so if you want to pay right away you should do so online. Just indicate it's a 2022 Extension payment.
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