The first page of my 1040 says "TO PAY YOUR TAXES DUE BY CHECK, MAIL THIS FORM TO THE ADDRESS LISTED BELOW." But of course, I want to pay electronically. Details: I owe Federal a few hundred dollars (nothing to State). I live oversees enjoy the 'Foreign Earned Income Exclusion'. I owe some Self-Employment tax.
If you have federal tax due you can pay by mailing your payment with the 1040V voucher, (which has the address printed on it, having the payment taken out of a designated bank account, or you can pay directly on the IRS website.
https://ttlc.intuit.com/community/tax-payments/help/how-can-i-pay-my-federal-taxes/00/26212
To apply for a payment plan with the IRS
Apply Online for a Payment Plan
You must pay your state tax due using the state’s preferred method of receiving payment. For most states that will be by making a payment to the state’s own tax website, or by mailing a check or money order.
https://ttlc.intuit.com/questions/1901670-how-do-i-contact-my-state-department-of-revenue