Each HAP contract dictates the terms of the annual adjustments. Your options will be the Annual Adjustment Factor (AAF) or a Budget-Based adjustment. If the AAF is not enough (often it is only 1% or 2%), you have the option to request a Special adjustment. This adjustment covers increases in utilities, taxes and insurance. Guidance for requesting a Special adjustment is found in HUD Handbook 4350.1, Chapter 34, Section 3.