A budget is a decision plan, not just a spending list.

A budget is a plan for allocating income across expenses, savings, debt payments, and other priorities.

A budget is a calculation plan, usually but not always financial, for a defined period, often one year or a month. A budget may include anticipated sales volumes and revenues, resource quantities including time, costs and expenses, environmental impacts such as greenhouse gas emissions, other impacts, assets, liabilities and cash flows. Companies, governments, families, and other organizations use budgets to express strategic plans of activities in measurable terms.