Money limits to qualify section 8 housing?

Your total tenant payment, or TTP, which included your rent and a reasonable amount of your utilities, should equal no more than one third of your income. The Housing Authority gives a utility allowance to factor in what you will pay for your rent out of your pocket versus what they will pay. One quick and easy way to calculate what your rent will be: divide your income by third. Now subtract your utility allowance, which is determined by the Housing Authority in your area. What's left is what you're likely to pay in rent.

If you are asking this question as a tenant, the above answer is correct. If you are asking this as a potential landlord, here is the answer:

The Housing Choice Voucher Program, known as section 8, as guidelines for which rent is paid to the landlord. The Housing Authority administers the program has a payment standard that ranges between 90 and 110% of the fair market value of the rent in that jurisdiction. That payment standard is preset and approved by HUD before the Housing Authority may implement it. So the highest amount of rent the landlord can charge depends on the fair market value of the rent for that unit, which is based on bedroom quantity. If the landlord charges too much for rent, the Housing Authority may not approve it.