Coming from Denmark I can tell that you that we do get pre filled Tax papers. Often there is nothing to change.<p>The fraud part has nothing to do with whether they can prefill papers or not. In fact even if they do make mistakes they will often catch them a year later.<p>So it's in your interest to make sure the numbers are correct.<p>Most often they are.<p>Also if you think about it. The investment the IRS should invest in getting a system that makes it possible to do this would be an investment easily paid back.<p>Having a incremental tax system it do require you to tell your expected annual salary up front as this will affect how much you are taxed. But it's all pretty automated theses days.