@Colleen F. increasing rents is all up to you - Section 8 does have what is called fair market value (FMV) for different cities and that is good. My rents are close to this FMV, but just because my cost go up doesn't mean I cannot raise the rent. I can only however raise the one per year (on lease renewal).
What this means is either Section 8 approves the additional amount or the tenant can choose to either absorb the additional cost or move. I include trash and water as part of my rent - and when these cost go up or the tenant decides to leave the water running and I receive a high water bill - I the landlord can only absorb these cost for so long before I start losing money.
I think most landlords think that once the have a Section 8 tenant that they can never charge more than the FMV for rent when renting to Section 8. To give an example, one of my units was renting for X (at FMV) and when the non- section 8 tenant moved out the market (not FMV) was approximately $150 higher. When I listed this property at this price which was +100 above the Section 8 limit I received all kinds of calls. The tenant I screened for the property just so happened to be Section 8. The choose to rent my property because it was nicer and the also chose to pay the difference above and beyond the FMV. I am not discriminating against Section 8 - this is the rent I want for my property and anyone can choose to pay the rent I wish to charge for my property.
The thing to remember when renting to Section 8 - there are many factors involved in the decision making process - not just the price of the rent but the utilities included. Each state is different but I bet most have the same type of policies regarding the rent a Section 8 tenant can pay but they allow variances as well.
Word of advice - know what you are getting into. Talk to the tenant's case worker and read the policies, guidelines, etc. Think of it this way - everyone needs a place to live and just because someone is Section 8 doesn't mean they have to live in Class C and below properties. The system isn't perfect but the more you know the better you can manage your property (aka ==> your business)!
Best of luck; I wish you success!