Cost accounting systems provide timely unit product costs through the use of perpetual inventory procedures and predetermined factory overhead rates. To introduce the basic ideas of cost accounting system， we present a simplified illustration to show the flow of product costs as follows：

　　成本会计系统通过使用永续盘存制和预定的制造费用分配率定期提供产品的单位成本。为了介绍成本会计系统的基本概念，现举一个简例来表述产品成本流程如下：

　　Acquisition of Materials：Materials inventory account rather than purchases account will be debited under a perpetual inventory system. Both raw materials and factory supplies are included in the inventory account. Materials ledger cards for each type of material or factory supply used make up the subsidiary record.（All figures are assumed）

　　材料的取得：在永续盘存制下，将借记材料盘存账户而非购料账户。原料和工厂用物料都包括在盘存账户中。为每一类原料设置的材料分类卡构成了辅助记录。（数字都是假设的）

　　（1） Materials Inventory 1，000

　　Accounts Payable 1，000

　　（1）材料盘存 1，000

　　应付账款 1，000

　　Recording Factory Payroll：The total factory payroll includes both direct and indirect labor.

　　工厂工薪的记录：工厂工薪总额中包括直接人工和间接人工。

　　（2）Factory Payroll 6，000

　　Factory Payroll Payable 6，000

　　（2）工厂工薪 6，000

　　应付工厂工薪 6，000

　　Recording Other Factory Costs as Overhead：Various items other than materials and labor costs are charged to Factory Overhead account.

　　其他工厂成本记录为制造费用：除材料和人工成本以外的各个项目记入制造费用账户。

　　（3） Factory Overhead 800

　　Accumulated Depreciation 200

　　Prepaid Insurance 150

　　Accrued Utilities Payable 100

　　Various Accounts 350

　　（3）制造费用 800

　　累计折旧 200

　　预付保险费 150

　　应计未付公用事业费100

　　其他各账户 350

　　At this point， all product costs have been accumulated into debit balances in the Materials Inventory， Factory Payroll， and Factory Overhead account. We are now ready to trace these costs through Work in Process and Finished Goods to the Cost of Goods Sold account.

　　这时，产品的全部成本已累积为材料盘存，工厂工薪和制造费用等账户的借方余额。现在就可以跟踪这些成本，通过在制品和制成品账户转至销货成本账户。

　　Recording Requisitions of Raw Materials and Factory Supplies：This entry reflects the requisition （evidenced by the material requisitions） of all materials to be used in production. Raw materials（or direct materials） are charged directly to the Work in Process account. Costs of factory supplies（or indirect materials） become part of factory overhead.

　　 原料和工厂用物料领用的记录：这笔记录反映将在生产中耗用的全部材料的领用（由领料单证明）。原料（即直接材料）应直接借记在制品账户，工厂用物料（即间接材料）的成本则成为制造费用的一部分。

　　（4） Work in Process 600

　　Factory Overhead 200

　　Materials Inventory 800

　　 （4）在制品 600

　　制造费用 200

　　材料盘存 800

　　Recording Distribution of Factory Payroll：Work in Process is debited for the direct labor and Factory Overhead is debited for the indirect labor. The total factory payroll is distributed， leaving a zero balance in the Factory Payroll account. The division of total factory payroll into direct and indirect labor is based on a detailed analysis of the job description， wage rates and hours worked of each employee （evidenced by such documents as the time tickets）。

　　工厂工薪分配的记录：直接人工应借记在制品账户，间接人工则借记制造费用账户。工厂工薪的总额既已分配，工厂工薪账户留下的余额就等于零，把工厂工薪总额区分为直接人工和间接人工，要根据对工作说明，工资率以及每一雇员的工作时数的详细分析（由计时单这样一些凭证证明）。

　　（5） Work in Process 500

　　Factory overhead 100

　　Factory payroll 600

　　（5）在制品 500

　　制造费用 100

　　工厂工薪 600

　　Recording Application of Factory Overhead：Most firms do not apply the actual amount of overhead incurred each period to the goods manufactured during that period. Instead， overhead is applied at average rates that reflect estimates of total annual production volume and total overhead costs for the year. Predetermined overhead rates are computed by estimating the coming year's total factory overhead cost and dividing it by an estimate of some unit of activity （such as direct labor hours， direct labor costs or factory machine hours ）。

　　制造费用分配的记录：大多数企业不是按照每期实际发生的制造费用金额分配于该期内制造的产品，而是按照反映全年总产量和全年制造费用总额估计数的平均分配率来分配制造费用。在计算预定制造费用分配率时，要估计翌年的制造费用总额，而后除以某种估计的工作量（例如直接人工小时，直接人工成本，或工厂机器工作小时）。

　　（6） Work Process 1，200

　　Factory Overhead 1，200

　　（240% of direct labor cost）

　　（6）在制品 1，200

　　制造费用 1，200

　　（直接人工成本的240%）

　　Recording Completed Production：This entry reflects the assignment of costs to completed production and the transfer of those costs from Work in Process to Finished Goods. 完工产品的记录：这一分录反映分配于完工产品的成本，并把这些成本从在制品账户转入制成品账户。

　　（7） Finished Goods 2，000

　　Work in Process 2，000

　　（7）制成品 2，000

　　在制品 2，000

　　Suppose that the firm produces a single product and the units completed in that period are 1，000 the unit product cost would be $2. 假设该企业只生产一种产品，当期的完工产量为1，000件，则产品单位成本为$2.

　　Recording Cost of Goods Sold：This entry transfers the cost of finished products sold （700 unit @ $2） to the Cost of Goods Sold account. 销货成本的记录：这一分录将已出售的制成品成本（700件@$2）转入销货成本账户。

　　（8） Cost of Goods Sold 1，400

　　Finished Goods 1，400

　　（8）销货成本 1，400

　　制成品 1，400

　　Under-or overapplied overhead （an overapplied overhead $50 in our example ） is expected at the end of interim accounting periods and is shown as deferred debits or credits on interim balance sheets. If the amount is immaterial， it is closed to Cost of Goods Sold at year-end； if material， it may be allocated among the Work in Process， Finished Goods and Cost of Goods Sold accounts.

　　在年度内各会计期期末，可望出现少分配或多分配制造费用（例中为多分配制造费用$50，在中期资产负债表上列示为递延借项或递延贷项。如金额不大，在年终时将结转于销货成本账户；如金额巨大，则可在在制品，制成品和销货成本等账户之间进行分配。