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Definition

Budget

A financial plan that estimates income and expenses over a period of time.

Written by Jere Salmisto·Reviewed by CalcFi Editorial·Last verified: 2026-05-13
TL;DR

Budget is A financial plan that estimates income and expenses over a period of time. Used in budgeting.

What Is Budget?

A budget is a detailed plan that outlines your expected income and anticipated expenses over a set period—typically monthly or annually. Creating a budget helps you track spending, control costs, save for goals, and avoid overspending. Common budgeting methods include 50/30/20 (50% needs, 30% wants, 20% savings), zero-based budgeting (where every dollar is allocated), and envelope budgeting (allocating cash to specific categories). A budget is a living document that should be reviewed and adjusted regularly as your income or expenses change. Even a simple budget can dramatically improve financial awareness and help you achieve long-term goals.

Related Terms

Cash Flow
The net amount of cash moving in and out of a household or business over a period.
Net Income
Total income after taxes, deductions, and expenses—your "take-home" amount.
Zero-Based Budgeting
A budgeting method where every dollar of income is assigned a purpose.

Related Calculators

Budget Planner→
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