How to make a payment on IRS.gov

First go to https://www.irs.gov/payments

You can sign in or create an account. If you'd like to skip the hassle of creating an account you can click Pay Now with Direct Pay

Click make a Payment

Reason for Payment:

Balance Due - Select this for an amount due with a tax return
Extension Payment - Select this if you are making an extension payment with your personal tax return
Estimated Payment - Select for quarterly estimates.

Apply Payment To:

Individuals select form 1040 Income Tax

Tax Period for Payment

Be sure to select the correct tax year for the payment.

At this point the IRS must verify your identity. It is usually best to select the most recently filed tax return for verification. If you did not file a 2020 tax return, select 2019 or it will not work.

Input the address as filed on that year's tax return. This may no longer be your current address.