Budgets can be done for varying time periods typically quarterly, semiannual, and on an annual basis. Probably the most popular budgeting time period is quarterly. Regardless of the time frame, this means a manager is tasked with estimating future sales revenue along with anticipated expenses. After the conclusion of that time period the actual revenue and expenses are compared with the projections done for the budget. The revenue budget projects anticipated sales revenue from the organization's products. In situations where an organization sells more than one product, a sales budget is broken down into individual product sales estimates. In some cases, this is further broken down into individual groups of customers and/or sales territories. The expense budget projects expenses related to the sales operation. This includes salaries, incentive, compensations such as commissions and out-of-pocket sales expenses such as travel and customer entertainment. In some cases these expense projections are formulaic. For example, if a sales staff is compensated 100 percent by commission, the sales commission is derived by multiplying the projected sales revenue by the commission rate.