Is there a benchmark for small business software support? In bigger businesses the expectation is that annual software support and updates cost around 20% of the purchase price. I am interested because we have just converted a client from another system. They were paying over $4,000 for software they purchased years ago for $6,000. Such a support fee seems a rip off. Our support charges have not changed in over four years and sit at around 10% of list price.