<prompt> Human: Edit. Thanks everyone, I understand now!As stated in the subject; I imagine there is some reason someone may ask this, but I cant figure out what the advantage would be. Say theyre paying 1000 cash for a car, why might they ask that the bill of sale I provide to list the purchase as 400?  <response>: To avoid paying their full tax amount. They arent trying to screw you over, just the government. 