That’s right, if you did nothing during 2018 about your taxes at all, you may end up owing not just extra taxes, but penalties as well — all because the IRS decided to rely on the old forms that you may have given to your employer years ago. The idea, of course, was for you to “start seeing a lot more money in your paycheck” as soon as possible, as Trump said. Unfortunately, all that money can come right out of your bank account in a few months, and then some.