Uh oh. I have put my SIN on all of the reciepts I handed out. I would write down the amount paid to me each week and just tallied it up by month then added that all up. I gave out the little slips from the dollar store receipt books with "Childcare services for xxx from xxx to xxx 2013 $xxx" with my signature and SIN. It says it on the Revenue Canada page so that it what I have done but am not feeling very paranoid.