hey i'm subletting this place for the summer, it's a student house and I'm getting from another student. My mom says I should get a receipt for my rent for tax deductions. I don't know how to do that and i'm pretty sure the person i'm renting from wouldn't either. So what's involved. Do I just need her to sign a sheet of paper that says I paid this much for this and this place ? or is it a more formal thing?