<prompt> Human: My brother has been nagging me about this for a couple months now and I havent been able to give him a satisfactory answer. Hes been working for a few years now and he gets paid half in cash, half in check. Hes saved all of the cash and hasnt spent a dime of it. Meaning he has about 20 grand in cash. One of the reasons why he never touched the cash was because he never reported it as income. Now he wants to pay off the remainder of his student loans with this cash, but is worried that if he does so that it would raise red flags with the IRS. I guess the main question is, would it be okay for him to deposit the cash into his account and then immediately use it to pay off his student loans of about 20 thousand? EDIT - Thanks for the advice guys. Pretty much the responses that I expected. Ill try to tell my brother, but whether he listens or not is up in the air. Thanks again.  <response>: No one here will recommend your brother to break the law. 