How can you make an extra payment to IRS?

You can make an extra payment to the IRS by using the Electronic Federal Tax Payment System (EFTPS), which allows you to schedule and make payments online. Alternatively, you can pay directly on the IRS website using a debit or credit card, or by using the IRS2Go mobile app. You can also send a check or money order along with Form 1040-V, Payment Voucher, to the address specified for your tax return. Always ensure to include your Social Security number and the tax year on any payment sent by mail.