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A budget is a quantitative expression of a plan for a defined period of time. It may include planned sales volumes and revenues, resource quantities, costs and expenses, assets, liabilities and cash flows. It expresses strategic plans of business units, organizations, activities or events in measurable terms.
A budget is an important concept in microeconomics, which uses a budget line to illustrate the trade-offs between two or more goods. In other terms, a budget is an organizational plan stated in monetary terms.
Why do we produce budgets? 
Budget helps to aid the planning of actual operations by forcing managers to consider how the conditions might change and what steps should be taken now and by encouraging managers to consider problems before they arise. It also helps co-ordinate the activities of the organization by compelling managers to examine relationships between their own operation and those of other departments. Other essentials of budget include:
- To control resources
- To communicate plans to various responsibility center managers.
- To motivate managers to strive to achieve budget goals.
- To evaluate the performance of managers
- To provide visibility into the company's performance
In summary, the purpose of budgeting is stools:
- tools provide a forecast of revenues and expenditures, that is, construct a model of how a business might perform financially if certain strategies, events and plans are carried out.
- stools enable the actual financial operation of the business to be measured against the forecast.
- Lastly,stools establish the cost constraint for a project, program, or operation.
Business start-up budget 
The process of calculating the costs of starting a small business begins with a list of all necessary purchases including tangible assets (for example, equipment, inventory) and services (for example, remodeling, insurance), working capital, sources and collateral. The budget should contain a narrative explaining how you decided on the amount of this reserve and a description of the expected financial results of business activities. The assets should be valued with each and every cost. All other expenses are like labour factory overhead all freshmen expenses are also included into business budgeting.
Corporate budget 
The budget of a company is often compiled annually, but may not be a finished budget, usually requiring considerable effort, is a plan for the short-term future, typically one year (see budget year). While traditionally the Finance department compiles the company's budget, modern software allows hundreds or even thousands of people in various departments (operations, human resources, IT, etc.) to list their expected revenues and expenses in the final budget.
If the actual figures delivered through the budget period come close to the budget, this suggests that the managers understand their business and have been successfully driving it in the intended direction. On the other hand, if the figures diverge wildly from the budget, this sends an 'out of control' signal, and the share price could suffer
Event management budget 
A budget is a fundamental tool for an event director to predict with reasonable accuracy whether the event will result in a profit, a loss or will break-even. A budget can also be used as a pricing tool.
There are two basic approaches or philosophies when it comes to budgeting. One approach is telling you on mathematical models, and the other on people.
The first school of thought believes that financial models, if properly constructed, can be used to predict the future. The focus is on variables, inputs and outputs, drivers and the like. Investments of time and money are devoted to perfecting these models, which are typically held in some type of financial spreadsheet application.
The other school of thought holds that it’s not about models, it’s about people. No matter how sophisticated models can get, the best information comes from the people in the business. The focus is therefore in engaging the managers in the business more fully in the budget process, and building accountability for the results. The companies that adhere to this approach have their managers develop their own budgets. While many companies would say that they do both, in reality the investment of time and money falls squarely in one approach or the other.
Government budget 
The budget of a government is a summary or plan of the intended revenues and expenditures of that government. There are three types of government budget : the operating or current budget, the capital or investment budget, and the cash or cash flow budget.
United States 
The federal budget is prepared by the Office of Management and Budget, and submitted to Congress for consideration. Invariably, Congress makes many and substantial changes. Nearly all American states are required to have balanced budgets, but the federal government is allowed to run deficits.
The budget is prepared by the Budget Division of Department of Economic Affairs of the Ministry of Finance annually. This includes supplementary excess grants and when a proclamation by the President as to failure of Constitutional machinery is in operation in relation to a State or a Union Territory, preparation of the Budget of such State. The railway budget is presented separately.
The Philippine budget is considered the most complicated in the world, incorporating multiple approaches in one single budget system: line-item (budget execution), performance (budget accountability), and zero-based (budget preparation). The Department of Budget and Management prepares the National Expenditure Program and forwards it to the Committee on Appropriations of the House of Representative to come up with a General Appropriations Bill (GAB). The GAB will go through budget deliberations and voting; the same process occurs when the GAB is transmitted to the Philippine Senate.
After both houses of Congress approves the GAB, the President signs the bill into a General Appropriations Act (GAA); also, the President may opt to veto the GAB and have it returned to the legislative branch or leave the bill unsigned for 30 days and lapse into law. There are two types of budget bill veto: the line-item veto and the veto of the whole budget.
Personal or family budget 
In a personal or family budget all sources of income (inflows) are identified and expenses (outflows) are planned with the intent of matching outflows to inflows (making ends meet). In consumer theory, the equation restricting an individual or household to spend no more than its total resources is often called the budget constraint.
Elements of a personal or family budget usually include, fixed expenses, monthly payments, insurance,entertainment, and savings.
There are many informational sites and software available for use in personal and family budgeting.
Budget types 
- Sales budget – an estimate of future sales, often broken down into both units and currency. It is used to create company sales goals.
- Production budget – an estimate of the number of units that must be manufactured to meet the sales goals. The production budget also estimates the various costs involved with manufacturing those units, including labor and material. Created by product oriented companies.
- Capital budget - used to determine whether an organization's long term investments such as new machinery, replacement machinery, new plants, new products, and research development projects are worth pursuing.
- Cash flow/cash budget – a prediction of future cash receipts and expenditures for a particular time period. It usually covers a period in the short term future. The cash flow budget helps the business determine when income will be sufficient to cover expenses and when the company will need to seek outside financing.
- Marketing budget – an estimate of the funds needed for promotion, advertising, and public relations in order to market the product or service.
- Project budget – a prediction of the costs associated with a particular company project. These costs include labour, materials, and other related expenses. The project budget is often broken down into specific tasks, with task budgets assigned to each. A cost estimate is used to establish a project budget.
- Revenue budget – consists of revenue receipts of government and the expenditure met from these revenues. Tax revenues are made up of taxes and other duties that the government levies.
- Expenditure budget – includes spending data items.
See also 
- "CIMA Official Terminilogy".
- Sullivan, Arthur; Steven M. Sheffrin (2003). Economics: Principles in action. Upper Saddle River, New Jersey 07458: Pearson Prentice Hall. p. 502. ISBN 0-13-063085-3.
- Cliche, P. (2012). “Budget,” in L. Côté and J.-F. Savard (eds.), Encyclopedic Dictionary of Public Administration, [online], http://www.dictionnaire.enap.ca/Dictionnaire/en/home.aspx
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