The prevailing rate of wages and supplements are determined annually on July 1 of each year and are effective through June 30, i.e. July 1, 2001 – June 30, 2002. (Article 8, Section 220, subd. 5a) When you review a schedule for a particular occupation, your attention should be directed to the dates above the column rates. These are the dates that additional adjustments become effective. Any error corrections or updates in the annual determination will be posted to the Department’s website on the first business day of each month. Contractors are responsible for paying these updated rates retroactive to July 1st.