A budget is a statement of planned future results expected from management's actions, expressed in monetary terms. It differs from a forecast, which estimates likely future positions based on past or present conditions. Budgets are prepared top-down by upper management or bottom-up by lower management. Functional budgets are set for each department based on principal budget factors like demand or materials. Operating budgets must match each other with sales budget set first, then production, purchasing, and expenditures. A master budget combines the functional budgets into a projected profit and loss statement and balance sheet. Budgets formalize plans, coordinate departments, indicate shortages, improve management commitment and control.