There are several choices when paying any taxes owed on your return(s).
For amounts owed to the IRS, Electronic Funds Withdrawal (EFW) is free and allows you to decide when the tax payment is scheduled to be withdrawn from your bank account. Electronic funds withdrawal is available only to those who e-file. Individuals may e-file early and, at the same time, schedule the electronic funds withdrawal as late as April 17, 2018. For returns filed after the filing deadline, the payment is effective on the filing date.
Others options for amounts due to the IRS are:
See the IRS web page Payment Options: Pay Online, Installment Plans and More for additional information.
Visit TaxAct's State Resources page for access to each state's website for information on paying taxes owed to any individual state.