Tax Day 2018: What to do if You Owe the IRS Money(AP) - Tax Day is finally here once more. If you’re getting a refund, lucky you. But if you owe the government money, you may be worried that you have to pay the amount due by the filing deadline of April 17 – even if you asked for an extension. Owing the IRS – especially when you don’t have the funds to pay – can cause major stress. But before you let the anxiety get the best of you, know this: The Internal Revenue Service, believe it or not, understands. In addition, you may qualify for a collection alternative to pay off your debt gradually or at a substantially reduced amount.