Difference Between Perpetual and Periodic Inventory System

Difference Between Perpetual and Periodic Inventory System:

Inventory records may be maintained on a perpetual or periodic basis. These two systems are explained below:

Perpetual Inventory System:

Under a perpetual inventory system, a continuous record of changes in inventory is maintained in the inventory accounting. That is, all purchases and sales (issues) of goods are recorded directly in the inventory account as they occur.
The accounting features of a perpetual inventory system are:
  1. Purchases of merchandise for resale or raw materials for production are debited to inventory rather than to purchases.
  2. Freight-in, purchases returns and allowances, and purchase discounts are recorded in inventory rather than in separate accounts.
  3. Cost of goods sold is recognized for each sale by debiting the account cost of goods sold, and crediting inventory.
  4. Inventory is a control account that is supported by a subsidiary ledger of individual inventory records. The subsidiary records show the quantity and cost of each type of inventory on hand.
The perpetual inventory system provides a continuous record of the balances in both the inventory account and the cost of goods sold account.
Under a computerized record keeping system, additions to and issuance from inventory can be recorded nearly instantaneously. The popularity and affordability of computerized accounting software have made the perpetual system cost-effective for many kinds of businesses. Recording sales with optical scanners at the cash register has been incorporated into perpetual inventory systems at many retail stores.

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Periodic Inventory System:


Under a periodic inventory system, the quantity of inventory on hand is determined, as its name implies, on the periodically. all acquisitions of inventory during the accounting period are recorded by debits to a purchases account. The total in the purchases account at the end of the accounting period added to the cost of the inventory on hand at the beginning of the period to determine the total cost of the goods available for sale during the period. Ending inventory is subtracted from the cost of goods available for sale to compute the cost of goods sold. Note that under a periodic inventory system, the cost of goods sold is a residual amount that is dependent upon a physical count of the ending inventory.
The physical inventory count required by a periodic system is taken once a year at the end of the year. However, most companies need more current information regarding their inventory levels to protect against stock outs or over purchasing and to aid in the preparation of monthly or quarterly financial data. As a consequence, many companies choose a modified perpetual inventory system in which increases and decreases in quantities only - not dollar amounts - are kept in a detailed inventory record.  It is merely a memorandum device outside the double entry system which helps in determining the level of inventory at any point in time.
Whether a company maintains a perpetual inventory in quantities and dollars, quantities only, or has no perpetual inventory record at all, it probably takes a physical inventory once a year. No matter what type of inventory records are in use or how well organized procedures for recording purchases and requisitions, the danger of loss and error is always present. Waste, breakage, theft, improper entry, failure to prepare or record requisitions, and any number of similar possibilities may cause the inventory records to differ from the actual inventory on hand. This requires periodic verification of the inventory records by actual count, weight, or measurement. These counts are compared with the detailed inventory records. The records are corrected to agree with the quantities actually on hand.
Insofar as possible, the physical inventory should be taken near the end of a company's fiscal year so that correct inventory quantities are available for use in preparing annual accounting reports and statements. Because this is not always possible, however, physical inventories taken within two or three months of the year's end are satisfactory, if the detailed inventory records are maintained with a fair degree of accuracy.

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