Which of the following best describes the term 'budget'?

The term 'budget' is best described as a financial plan that outlines the service goals of an organization, along with the associated costs and financing methods required to achieve those goals. This definition encompasses not only the financial figures but also links the planned expenditures to the strategic objectives of the organization, ensuring that resources are allocated effectively to meet those goals.

A budget serves as a roadmap for an organization's financial activities over a specified period, typically a fiscal year. It includes projections for revenues and expenditures, thus enabling organizations to plan and assess their financial health and performance against their strategic objectives. In this sense, a budget is an essential tool for decision-making and resource management in both governmental and non-governmental entities.

The other choices do not fully capture the comprehensive nature of a budget. While a report on past performance can inform budgeting processes, it does not constitute a budget itself. Similarly, an estimate of future revenue generation is an important component of a budget but does not encompass its entirety. A summary of legislative spending plans might relate to budget discussions but lacks the comprehensive detail and plans outlined in a formal budget document.