Break even analysis is used by businesses to determine the sales volume needed to cover total costs. It is calculated by dividing fixed costs by the unit contribution. Unit contribution is determined by subtracting variable costs from selling price. This allows businesses to set sales targets and understand their margin of safety. Budgets are also important for businesses to control expenditures and understand cash flow. There are expenditure, operating and cash flow budgets. Properly controlling budgets and costs is crucial to avoiding debt spirals and ensuring profitability.