An estimation of future revenues and expenses for a certain period

What is a Budget?

A budget is an estimation of future revenues and expenses for a certain period. The budgeting process creates plans to make expenses or allocate resources. It can be made for an individual, project, business, government, or other organizations.





  • A budget is an estimation of future revenues and expenses, which helps to plan for future expenses or allocation of resources for a certain period.
  • A personal budget depends on the individual’s standard of living, age, lifestyle, personal preferences, and so on.
  • A corporate budget depends on a series of assumptions and aligns with the firm’s business strategy and objective.


Understanding Budgets

Based on the concept of limited resources, it is common for individuals and organizations to create budgets to allocate their incomes or capital efficiently. It is a process of creating financial plans for a specific period, which can be a month, a year, or the term of a project.

Budgeting is important for individuals to achieve financial success, as well as for organizations to complete projects and operate successively.

Budgets can be either flexible or static. A static budget keeps constant without adjustments over the entire budgeting term. Personal budgets are usually static. Budgets depend on assumptions and estimation of future incomes.

Changes in relevant factors such as economic conditions will cause changes in these assumptions, and the original budget might not be appropriate anymore.

A flexible budget can adapt to the changing variables. It is usually created by corporates and designed to move along with the changing industry indicators, sales levels, production level, as well as other internal and external factors.


Surplus, Balanced, and Deficit Budgets

Based on the relationship between estimated incomes and expenses, budgets can be categorized into surplus, balanced, and deficit ones.


Surplus Budget

A surplus budget is a plan with incomes exceeding expenditures during a certain period. In surplus budgets, expenses can be fully covered by incomes, and the residuals can be saved for future use.

The term “surplus:” is often used by governments. It indicates the government will not run out of their tax revenues and other incomes in that year. For individuals, a surplus budget allows them to make savings.


Balanced Budget

Expenditures are planned to be equal to incomes in a balanced budget. There will be neither residuals nor the need to borrow.


Deficit Budget

In a deficit budget, expenditures cannot be fully covered by incomes for that period. If a company is running under a budget deficit, it has to finance the deficit by issuing bonds or stocks. If an individual has a budget deficit, they can withdraw their savings or borrow from others.

A government usually has a deficit during economic recessions, as it intends to boost the economy by pumping money into the market.


Personal Budgets

Personal budgets help individuals and families to determine how to spend their incomes to fulfill their daily needs and wants while maintaining financial health. Budgets vary for individuals, and there is no unified standard.

The factors that impact personal budgets include the average cost of living in a city, an individual’s income level, lifestyle, and personal preferences.


Personal Budget


The personal budgeting process usually starts with determining the costs on necessities – such as housing (rentals or mortgage payments), food, transportation, and utilities. Most individuals also keep a certain portion for savings or investments. The rest of the income can be spent on dining out, movies, shopping, and other entertainments.

A commonly used personal budgeting principle is the “50-20-30” rule. It suggests spending 50% of an individual’s after-tax income on necessities, 30% on entertainment or other unnecessary events, and save the rest 20% for future needs or investments.


Corporate Budgets

A company’s corporate budget generally aligns with its business strategy and objective. The budget developing process starts with a set of assumptions, including the economic outlook, industry trend, sales trend, relationship with suppliers and distributors, and so on.

Based on the assumptions, sales budgets can be developed. Companies with several subsidiaries or product lines might budget the sales for them, respectively.

Sales budgeting allows firms to forecast their future cash flows. Combining the information of future cash flows, historical expenses, assumptions of future trends, and business strategies, companies can budget their expenses.

If a company realizes that it will not be able to cover its expenses with future cash flows, it might need to consider borrowing and budget the interest expenses.


Government Budgets

A government budget comprises government incomes – such as tax revenues – as well as government expenditures, including infrastructure facilities, public health care insurance plans, and costs to run different departments.

A government usually runs under budget surplus during economic expansions with increasing tax revenues. A budget deficit often appears during recessions, as the government intends to cut taxes and inject cash into the market.


More Resources

CFI offers the Commercial Banking & Credit Analyst (CBCA)™ certification program for those looking to take their careers to the next level. To keep learning and developing your knowledge base, please explore the additional relevant resources below:

  • Income vs Revenue vs Earnings
  • Budget Deficit
  • Government Spending
  • Investment Portfolio

Financial Analyst Training

Get world-class financial training with CFI’s online certified financial analyst training program!

Gain the confidence you need to move up the ladder in a high powered corporate finance career path.


Learn financial modeling and valuation in Excel the easy way, with step-by-step training.