The budgetary cycle of the federal government follows a regular schedule. The Budget for the upcoming fiscal year (which runs from April to March) is brought down by the Minister of Finance in late winter or early spring.
About six months later, or half way through the fiscal year, the revenue, expenditure, and deficit/surplus numbers, announced and projected in the budget (for both the current and future fiscal years), are updated by the Minister in the Fall Fiscal and Economic Update. On occasion, the federal government will use the Fiscal and Economic Update to announce new taxation and expenditure measures.