Which financial document is essential for tracking expenses and income?

A spending plan is crucial for monitoring both expenses and income because it serves as a financial blueprint that outlines how money is allocated over a specific period. This document helps individuals understand their financial situation by detailing expected income and planned expenses, including essential and discretionary spending. By regularly updating and reviewing a spending plan, individuals can identify spending patterns, adjust their budget as needed, and ensure they live within their means. This proactive management of finances can lead to better savings and financial health.

In contrast, a resume outlines a person's work experience and skills but does not provide any financial data. A tax return reflects income and tax liabilities for a past year but doesn't serve to track ongoing finances. Similarly, a loan contract details the terms of a borrowing agreement and payment obligations but does not support expense tracking or income management.