The statutory expenditures are comprised of committed government funding that parliamentarians voted through past legislation. Employment insurance is a good case in point, or CPP payments. Voted expenditures represent government funding contained in legislation that has not yet been passed by Parliament. They would approved by Parliament through appropriation or supply bills.
Evidence of meeting #41 for Government Operations and Estimates in the 41st Parliament, 2nd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was budget.
A video is available from Parliament.