when you make a payment (to a person who is not your employee), you need to deduct "withholding tax"
税率根据提供服务性质不同也不一样，有20%，15%，33%，一般来说，
cleaning office, business----20%
caretaking or acting as a guard---15%
还取决于提供服务的人, he must provide a withholding tax declaration, if not, the rate will increase by 15 cents.
如果提供服务的是non-resident contractor,并且金额很小，就不需要扣税；
如果提供服务的是GST registered, 并且给你tax invoice， 你以后还可以claim back
是个人家房子还是公司的房子，也有关系，
不知道这些信息能不能帮到你