Understanding Inventory Cost Flow Assumptions

Current inventory levels affect the balance sheet of350,000 X $0.75, 250,000 X $1.00).  The average
a company.  The amount of product multiplied byprice paid per lollipop is $0.62 ($712,500 divided by
the cost determines the amount of inventory1,150,000).  If Candy Inc. sold 1 million lollipops in 2008
reflected on the balance sheet.  Inventory valuation150,000 lollipops remained at the end of the year. 
is easy for companies selling small quantities of highThe remaining inventory would be valued at
value products because the number of items in$92,934.78 (150,000 X $0.62) and the cost of goods
inventory at any given time is small.  Larger retailerssold throughout the year would be $619,565.20
like Wal-Mart and Costco have greater difficulty(1,000,000 X $0.62).  If Candy Inc. sold each lollipop
assigning inventory values and costs of goods soldat $1.25 the net income for 2008 would be
because of the large number of products that flow in$630,434.80 ($1,250,000 - $619,565.20).
and out.  To make this process easier there areThe First-in, first out (FIFO) method is slightly more
multiple methods of assigning value to inventory. complicated than the weighted average.  Despite the
We will detail these methods through a fictionalway inventory flows in and out of a company the
company, Candy Inc., to better understand how eachvalue assigned to the cost of goods sold and current
affects inventory value and cost of goods sold atinventory would be based on first products in would
the end of the fiscal year.be the cost assigned to first products out the door. 
Candy Inc. sells on average four million lollipops perIn the Candy Inc. example, 1.15MM lollipops were
year.  They purchase their inventory every quarterpurchase throughout the year at varying prices and
based on the previous quarter’s sales.  In 20081MM were sold.  The cost of goods sold for the
Candy Inc. purchased 300,000 lollipops on January 1,year is $562,500 (300,000 X $0.25, 250,000 X $0.50,
250,000 lollipops on April 1, 350,000 on July 1 to350,000 X $0.75, 150,000 X $1.00).  The remaining
account for summer demand and 250,000 oninventory is $150,000 (150,000 X $1.00).  If Candy
October 1 to account for the remainder of theInc. sold each lollipop at $1.25 the net income under
year.  In 2008 the candy industry experienced itsthe FIFO cost assumption would be $687,500.00
highest levels of inflation, rising costs, in 50 years. ($1,250,000 - $562,500).
Each quarter saw a 25 cent increase because of theLast-in, first out (LIFO) is the opposite of FIFO.  The
rising costs of sugar.  As product flowed in and outinventory values assigned to the cost of goods sold
of Candy Inc. it became impossible to assign actualand the current inventory are based on the last
value to the cost of goods sold and the currentitems purchased are assigned to the cost of goods
inventory.  This example will help us understand thesold.  The remaining inventory is then based on the
four inventory cost flow assumptions and how theycost of those products purchased earlier in the
affect current assets and net income.year.  In the Candy Inc. example, 1.15MM lollipops
The four inventory cost flow assumptions arewere purchase throughout the year at varying prices
specific identification, weighted average, FIFO (first-in,and 1MM were sold.  The cost of goods sold for the
first-out) and LIFO (last-in, first-out).  Specificyear is $675,000 (150,000 X $0.25, 250,000 X $0.50,
identification is assigning value of the cost of goods350,000 X $0.75, 250,000 X $1.00).  The remaining
sold and the current inventory based on the actualinventory is $37,500 (150,000 X $0.25).  If Candy Inc.
price paid.  For Candy Inc. the cost of each lollipopsold each lollipop at $1.25 the net income under the
from the manufacturer would be assigned to eachLIFO cost assumption would be $575,000.00
lollipop.  The problem Candy Inc would experience($1,250,000 - $675,000).
given the volume of candy sold is mixed upAs you can see each of the different inventory cost
inventories which would make it virtually impossible toflow assumptions greatly impacts the net income and
know the true cost of a single lollipop when it wascurrent inventory values.  In our example, Candy
sold to a consumer.Inc’s net income was $630,434.80 under the
Another cost option is the weighted average costweighted average method, $687,500.00 under FIFO
flow assumption.  Under this assumption the averageand $575,000.0 under LIFO.  The current inventory
price paid for the lollipops would be determined andthat makes up part of current assets was
assigned to remaining inventory and cost of goods$92,934.78 under the weighted average method,
sold.  In our example, each quarter saw a 25 cent$150,000 under FIFO and $37,500.0 under LIFO. 
increase.  In January lollipops cost 25 cents, in AprilManipulation of current assets and net income would
they cost 50 cents, in July they cost 75 cents and inbe easy if companies used different methods
October they cost 1 dollar.  In the weighted averagedepending on the economic climate, therefore it is
model the total cost of inventory purchased for 2008important to be consistent so users of financial
is $712,500.00 (300,000 X $0.25, 250,000 X $0.50,accounting may accurately assess trends over time.