CHAPTER 6
Accounting for Merchandise Inventory
Chapter Overview
Chapter 6 examines the accounting for merchandise inventory. The perpetual inventory record is explained. Four
different costing methods—specific unit cost, average cost, FIFO cost, and LIFO cost—
are explained. Students learn how to determine the quantity and cost of inventories and cost of goods sold for FIFO,
LIFO, and average costing by using the perpetual inventory record and also learn the related journal entries. The
inventory methods are compared and the advantages and disadvantages of each are detailed. A mid-chapter summary
problem allows students to practice preparing three perpetual inventory records, preparing journal entries using FIFO,
LIFO, and average cost, and computing gross profit for each method.
The chapter resumes with a discussion of inventory costing in a periodic system for FIFO, LIFO and average
cost. The accounting principles and concepts that affect inventory—the consistency principle, the disclosure principle, the
materiality concept, and accounting conservatism—are explained. The lower-of-cost-or-market rule is defined, followed
by an illustration of the effects of inventory errors. Ethical issues in inventory accounting are emphasized. The chapter
then illustrates how to estimate inventory using the gross profit method. The Decision Guidelines provide guidance for
inventory management, and an Excel Application problem reinforces concepts learned in the chapter. The chapter
concludes with a summary problem that has students prepare three income statements using FIFO, LIFO, and average
cost. An appendix to the compares the perpetual and periodic inventory systems.
Learning Objectives
After studying Chapter 6, your students should be able to:
1.
Compute perpetual inventory amounts under FIFO, LIFO, and average cost
2.
Record perpetual inventory transactions
3.
Compare the effects of FIFO, LIFO, and average cost
4.
Compute periodic inventory amounts under FIFO, LIFO, and average cost
5.
Apply the lower-of-cost-or-market rule to inventory
6.
Determine the effects of inventory errors
7.
Estimate ending inventory by the gross profit method
Chapter Outline
Objective 1: Compute perpetual inventory amounts under FIFO, LIFO, and average cost
A.
Companies determine the number of units sold and the units in inventory from perpetual inventory records.
(Exhibit 6-1 shows the financial statements of Columbia Sportswear and how inventory appears on the balance
sheet and cost of goods sold appears on the income statement.)
1.
Ending inventory = number of units on hand x unit cost
2.
Cost of goods sold = number of units sold x unit cost
B.
The perpetual inventory record maintains a continuous record for each inventory item. The quantity of the
inventory on hand is updated whenever inventory is purchased or sold. (See Exhibit 6-2)
C.
The four costing methods allowed by GAAP are specific unit cost; average cost ; first-in, first-out (FIFO); and
last-in, first-out (LIFO). Exhibit 6-3 compares the cost flows of the three most popular methods.
1.
The specific unit cost (specific identification) method assigns a specific invoice cost to each item in the
inventory. This method can be used for items that differ from unit to unit, such as real estate and
automobiles but is seldom used in practice.
2.
The average cost method assigns an average cost to the units on hand and sold.
3.
Under the first-in, first-out (FIFO) cost method, the oldest costs are assigned to cost of goods sold.
4.
Under the last-in, first-out (LIFO) cost method, the most recent costs are assigned to cost of goods
sold.
Objective 2: Record perpetual inventory transactions
A.
B.
Under FIFO, cost of goods sold comes from the first costs incurred each period. FIFO is consistent with the
physical flow of goods.
1.
FIFO leaves in ending inventory the most recent costs incurred during the period.
2.
See Exhibit 6-4 for an illustration of a perpetual inventory record and the related journal entries.
Under LIFO, the cost of goods sold recorded always comes from the last costs incurred each period. LIFO is
favored by many companies because it often results in the highest cost of goods sold and the lowest income tax.
1.
C.
LIFO leaves in ending inventory the oldest costs of the period.
2.
See Exhibit 6-5 for an illustration of a perpetual inventory record and the related journal entries.
Under average costing, a new unit cost is computed after each purchase. This unit price is applied to the number
of units sold.
1.
The ending inventory is the number of units multiplied by this average cost.
2.
See Exhibit 6-6 for an illustration of a perpetual inventory record and the related journal entries.
Objective 3: Compare the effects of FIFO, LIFO, and average cost
A.
FIFO is the most popular method, followed by LIFO, and then average cost. (Exhibit 6-7)
B.
During a period of rising prices, FIFO produces the lowest cost of goods sold, the highest gross profit, and highest
net income. Higher net income may help companies to attract investors and to borrow on favorable terms. (Refer
to Exhibit 6-8)
C.
During a period of rising prices, LIFO results in the highest cost of goods sold, the lowest gross profit, and the
lowest net income. Lower income results in lower taxes and higher cash flow.
D.
Average cost results fall between LIFO and FIFO.
Objective 4: Compute periodic inventory amounts under FIFO, LIFO, and average cost
A.
In the periodic inventory system, the business does not keep a daily running record of the inventory on hand.
The appendix to Chapter 6 illustrates how the periodic inventory system works.
B.
A physical count of the quantity of inventory is made at the end of the year.
C.
Cost of goods sold is computed by using this formula.
+
=
=
D.
Beginning inventory (the inventory on hand at the end of the preceding period)
Net purchases (often abbreviated as Purchases)*
Cost of goods available for sale
Ending inventory (the inventory on hand at the end of the current period)
Cost of goods sold
Net purchases is determined by using this formula:
+
=
Purchases
Purchase discounts
Purchase returns and allowances
Transportation-in
Net purchases
E.
The application of the various costing method (FIFO, LIFO, and average cost) follows the pattern illustrated
earlier for the perpetual system. For example, under periodic FIFO, the ending inventory consists of the most
recently purchased units since the first units acquired are in cost of goods sold.
F.
No journal entry is made for cost of goods sold at the time of sale.
G.
While periodic and perpetual FIFO amounts are exactly the same, periodic and perpetual LIFO amounts can
differ.
H.
The average cost in the periodic system is determined as follows:
Cost of goods available for sale ÷ number of units available for sale
I.
Several accounting principles relate to inventories:
1.
The consistency principle requires businesses to use the same accounting methods and procedures from
period to period. Inventory methods can be changed, but the change and the effect of the change must be
disclosed.
2.
The disclosure principle requires companies to report enough information for outsiders to make
knowledgeable decisions. Information should be relevant, reliable, and comparable. Inventory methods
must be disclosed.
3.
The materiality concept states that a company must adhere to GAAP only for items and transactions that
are significant to the business’s financial statements. Information is significant or material when its
presentation in the financial statements would cause someone to change a decision.
4.
Conservatism in accounting means reporting items in the financial statements at amounts that lead to the
most cautious immediate results. Some guidelines are:
a.
Do not anticipate gains, but provide for all probable losses.
b.
If in doubt, record an asset at the lowest reasonable amount and a liability at the highest possible
amount.
c.
When there’s a question, record an expense rather than an asset.
Objective 5: Apply the lower-of-cost-or-market rule to inventory
A.
Inventory should be reported at the lower-of-cost-or-market (LCM); that is, the lower of its historical cost or its
current replacement cost. This is an example of accounting conservatism.
B.
When inventory is written down to market, then cost of goods sold increases to reflect the loss in value as
illustrated by the following entry:
Cost of Goods Sold
Inventory
XX
XX
Objective 5: Determine the effects of inventory errors
A.
Errors in ending inventory affect not only the balance of inventory but also cost of goods sold, gross profit, and
net income in the period that the error occurs (period 1). (Exhibit 6-9 is an example of an inventory error. Exhibit
6-10 summarizes the effects of an error on two periods.)
B.
Inventory errors reverse (or counterbalance) in period 2 and have the opposite effect on cost of goods sold,
gross profit, and net income.
C.
Unethical managers can overstate ending inventory or report dubious sales in order to overstate net income.
Objective 6: Estimate ending inventory by the gross profit method
A.
The gross profit method of estimating inventory is based on the cost of goods sold computation discussed in
Objective 4 (C). That computation can be rearranged to solve for the ending inventory.
Cost of Goods Sold
Beginning inventory
+ Purchases
= Cost of goods available for sale
- Ending inventory
= Cost of goods sold
B.
XX
XX
XX
(XX)
XX
Computation of
Estimated Ending Inventory
Beginning inventory
XX
+ Purchases
XX
= Cost of goods available for sale
XX
- Cost of goods sold (estimated)
(XX)
= Ending inventory (estimated)
XX
The cost of goods sold (above) is estimated using the following formula (Exhibit 6-11):
Net sales revenue (Sales revenue less returns, allowances, and discounts)
- Estimated gross profit (Sales revenue x gross profit rate)
= Estimated cost of goods sold
C.
Decision Guidelines summarize various aspects of inventory such as which inventory system to use, which
inventory method to use, and how to estimate the ending inventory.
APPENDIX TO CHAPTER 6: Comparing the perpetual and periodic inventory systems
A.
In the periodic system, the purchase of inventory is recorded in an account called Purchases instead of the
Inventory account.
B.
Journal entries, T-accounts, and financial statement presentation of both the perpetual and periodic system are
illustrated in Exhibit 6 A.
1.
The purchase of inventory is recorded as follows:
Perpetual
Inventory
XX
Accounts Payable
XX
2.
XX
XX
The sale of inventory only requires one entry under periodic system but two under the perpetual:
Perpetual
Accounts Receivable
Sales Revenue
Cost of Goods Sold
Inventory
3.
Periodic
Purchases
Accounts Payable
XX
XX
Periodic
Accounts Receivable
Sales Revenue
XX
XX
XX
XX
At the end of the period, Inventory must be updated and Cost of Goods Sold recorded under the periodic
system. No entries are required under the perpetual system.
Perpetual
Periodic
Cost of Goods Sold
Inventory (beg.)
XX
XX
Inventory (end.)
XX
Cost of Goods Sold
XX
Cost of Goods Sold
Purchases
XX
XX