The Post 9/11 GI Bill Monthly Housing Allowance (MHA) payments for the 2013-14 academic year are now in effect. If the BAH increased for your area, you will see an increase in your September payment for training pursued in August.
The Post-9/11 GI Bill MHA is based on the DoD's Basic Allowance for Housing (BAH) rates for an E-5 with dependents. The Department of Defense adjusts the military BAH rate every calendar year (or January 1) based on changes to housing costs across the country. Rates can either go up or down. However, if the BAH decreases for your area, your MHA amount will not decrease unless you change schools or have more than a six-month break in training.