Tax Day is coming! An extension of time to file is not an extension of time to pay. Don't let IRS penalties and interest pile up. First, pay as much as you can, online, by check, or by using the IRS2Go app. If you need credit, consider using a credit card or loan. The cost may be lower than the IRS interest and penalties. You can also set up a payment plan with the IRS, using their online payment agreement tool. (April, 2017)