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Inventory and Cost of Goods Sold [Part 4]

Written By Universal TechWorld on Wednesday, March 19, 2014 | 1:24 AM

B1. Perpetual FIFO

Under the perpetual system the Inventory account is constantly (or perpetually) changing. When a retailer purchases merchandise, the retailer debits its Inventory account for the cost; when the retailer sells the merchandise to its customers its Inventory account is credited and its Cost of Goods Sold account is debited for the cost of the goods sold. Rather than staying dormant as it does with the periodic method, the Inventory account balance is continuously updated.
Under the perpetual system, two transactions are recorded when merchandise is sold: (1) the sales amount is debited to Accounts Receivable or Cash and is credited to Sales, and (2) the cost of the merchandise sold is debited to Cost of Goods Sold and is credited to Inventory. (Note: Under the periodic system the second entry is not made.)
With perpetual FIFO, the first (or oldest) costs are the first moved from the Inventory account and debited to the Cost of Goods Sold account. The end result under perpetual FIFO is the same as under periodic FIFO. In other words, the first costs are the same whether you move the cost out of inventory with each sale (perpetual) or whether you wait until the year is over (periodic).

B2. Perpetual LIFO

Under the perpetual system the Inventory account is constantly (or perpetually) changing. When a retailer purchases merchandise, the retailer debits its Inventory account for the cost of the merchandise. When the retailer sells the merchandise to its customers, the retailer credits its Inventory account for the cost of the goods that were sold and debits its Cost of Goods Sold account for their cost. Rather than staying dormant as it does with the periodic method, the Inventory account balance is continuously updated.
Under the perpetual system, two transactions are recorded at the time that the merchandise is sold: (1) the sales amount is debited to Accounts Receivable or Cash and is credited to Sales, and (2) the cost of the merchandise sold is debited to Cost of Goods Sold and is credited to Inventory. (Note: Under the periodic system the second entry is not made.)
With perpetual LIFO, the last costs available at the time of the sale are the first to be removed from the Inventory account and debited to the Cost of Goods Sold account. Since this is the perpetual system we cannot wait until the end of the year to determine the last cost—an entry must be recorded at the time of the sale in order to reduce the Inventory account and to increase the Cost of Goods Sold account.
If costs continue to rise throughout the entire year, perpetual LIFO will yield a lower cost of goods sold and a higher net income than periodic LIFO. Generally this means that periodic LIFO will result in less income taxes thanperpetual LIFO. (If you wish to minimize the amount paid in income taxes during periods of inflation, you should discuss LIFO with your tax adviser.)
Once again we'll use our example for the Corner Shelf Bookstore:
12X-table-05
Let's assume that after Corner Shelf makes its second purchase in June 2011, Corner Shelf sells one book. This means the last cost at the time of the sale was $89. Under perpetual LIFO the following entry must be made at the time of the sale: $89 will be credited to Inventory and $89 will be debited to Cost of Goods Sold. If that was the only book sold during the year, at the end of the year the Cost of Goods Sold account will have a balance of $89 and the cost in the Inventory account will be $351 ($85 + $87 + $89 + $90).
If the bookstore sells the textbook for $110, its gross profit under perpetual LIFO will be $21 ($110 - $89). Note that this is different than the gross profit of $20 under periodic LIFO.

B3. Perpetual Average

Under the perpetual system the Inventory account is constantly (or perpetually) changing. When a retailer purchases merchandise, the costs are debited to its Inventory account; when the retailer sells the merchandise to its customers the Inventory account is credited and the Cost of Goods Sold account is debited for the cost of the goods sold. Rather than staying dormant as it does with the periodic method, the Inventory account balance under the perpetual average is changing whenever a purchase or sale occurs.
Under the perpetual system, two sets of entries are made whenever merchandise is sold: (1) the sales amount is debited to Accounts Receivable or Cash and is credited to Sales, and (2) the cost of the merchandise sold is debited to Cost of Goods Sold and is credited to Inventory. (Note: Under the periodic system the second entry is not made.)
Under the perpetual system, "average" means the average cost of the items in inventory as of the date of the sale. This average cost is multiplied by the number of units sold and is removed from the Inventory account and debited to the Cost of Goods Sold account. We use the average as of the time of the sale because this is aperpetual method. (Note: Under the periodic system we wait until the year is over before computing the average cost.)
Let's use the same example again for the Corner Shelf Bookstore:
12X-table-06
Let's assume that after Corner Shelf makes its second purchase, Corner Shelf sells one book. This means the average cost at the time of the sale was $87.50 ([$85 + $87 + $89 + $89] ÷ 4]). Because this is a perpetual average, a journal entry must be made at the time of the sale for $87.50. The $87.50 (the average cost at the time of the sale) is credited to Inventory and is debited to Cost of Goods Sold. After the sale of one unit, three units remain in inventory and the balance in the Inventory account will be $262.50 (3 books at an average cost of $87.50).
After Corner Shelf makes its third purchase, the average cost per unit will change to $88.125 ([$262.50 + $90] ÷ 4). As you can see, the average cost moved from $87.50 to $88.125—this is why the perpetual average method is sometimes referred to as the moving average method. The Inventory balance is $352.50 (4 books with an average cost of $88.125 each).

Comparison of Cost Flow Assumptions

Below is a recap of the varying amounts for the cost of goods sold, gross profit, and ending inventory that were calculated above.
12X-table-07
The example assumes that costs were continually increasing. The results would be different if costs were decreasing or increasing at a slower rate. Consult with your tax advisor concerning the election of cost flow assumption.
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