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.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: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.A budget is a fundamental tool for an event director to predict with a 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.