If you are converting the use of a property you already own from a personal residence for you to a rental, then your taxes will not increase at all, except for the small increase when you can no longer claim the $7,000 Homeowner Occupant exemption. This is only 1% x $7,000 = $70/year... hardly worth talking about.
If you are considering buying another property (that you do not currently own, obviously) as a rental, then taxes might go up or down, perhaps dramatically. You can find out by going to Hunter-Broker.com and selecting the "Taxes" menu item to calculate this.
Hope this helps,
Terry Hunter, MS