Spixie, I've had a Mom in my daycare for 4 years who WORKS for the small business secion of CRA and she has never once asked me for my SIN or BIN. Just give them your name and address and phone # and put that all on your receipt and relax. However, if the CRA asked me for my SIN I would give it to them, but not to a parent. Not that I don't trust my daycare parents, it's just that I want to be very careful with my private information.