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Is it a bad idea to invest a student loan?
Are there any laws against doing this?  so long as you are truthful in your application for the loan, none that I know of - technically you could use the loan to pay for school and the cash that you would have used instead to invest.   Are there other reasons why this is a very bad idea? I think you've already identified the biggest one, but here are my reasons: Will you go broke or go to jail? Likely not, but there is significant risk in investing with borrowed money. You might come out ahead, but you might also lose a bundle.  If you're willing to take that risk, that's your right, but I would not call it a good idea under any circumstances.