In part it is because the actual planned spending takes into consideration funding that we're going to get through the central votes, based on historical patterns of accessing those, for example, pay list expenditures, offsetting compensation increases, and also the carry-forward the department is entitled to from one year to the other. The main estimates is the voted authorities. The planned spending number is informed by other funds that one may receive throughout the year through other voted authorities, including central votes. It is informed by past spending patterns, as well as projected spending for the year.
On May 13th, 2015. See this statement in context.