<prompt> Human: As title says he hasnt filed for 30 years. However hes always worked with a company where hes filled out a W4 and had taxes taken out. Hes always claimed zero on the form. His primary fear is 1. Going to jail or 2. Owing thousands of dollars or both. Having claimed zero, or the maximum amount they can take, is he actually missing out on money? Primary reason for this discussion is my friends little sister needs a Fafsa filled out but hes too scared to file. Any suggestions would greatly appreciated  <response>: The average tax refund is 3120. Claiming 0, he probably gave the government 50000 of his money for free over the past 30 years. Unfortunately hes only entitled to collect on the past 3 years refunds.He probably doesnt owe, because if he did the IRS would have sent him sternly worded letters by now. 