What is inventory? What are its valuation methods (FIFO, LIFO, Weighted Average, Specific Identification)?

Inventory refers to goods held for sale or production. Valuation methods include FIFO, LIFO, Weighted Average, and Specific Identification, affecting cost of goods sold and ending inventory values.

What is Inventory?

Inventory refers to goods that a company holds for sale in the ordinary course of business, or materials used in production of goods for sale.

Types of Inventory:

Raw Materials: Basic materials for production
Work-in-Progress: Partially completed goods
Finished Goods: Completed products ready for sale
Merchandise: Goods purchased for resale

Inventory Importance:

Major current asset for many companies
Affects cost of goods sold and profit
Impacts cash flow and working capital
Subject to theft, damage, obsolescence

Inventory Valuation Methods

1. FIFO (First-In, First-Out)

Assumes oldest inventory sold first.

Effect in inflation: Lower COGS, higher ending inventory, higher profit
Balance sheet: Inventory at recent prices
Example: Sell oldest items first
Allowed: Both GAAP and IFRS

2. LIFO (Last-In, First-Out)

Assumes newest inventory sold first.

Effect in inflation: Higher COGS, lower ending inventory, lower profit
Balance sheet: Inventory at older prices
Example: Sell newest items first
Allowed: GAAP only, not IFRS

3. Weighted Average Cost

Average cost of all units available.

Calculation: Total cost ÷ Total units
Effect: Smooths price fluctuations
Example: All units at average price
Allowed: Both GAAP and IFRS

4. Specific Identification

Track cost of each specific item.

Use: High-value, unique items
Examples: Cars, jewelry, custom furniture
Required: For items not interchangeable
Allowed: Both GAAP and IFRS

Practical Examples and Calculations

Sample Data:

Beginning inventory: 100 units @ $10 = $1,000
Purchase 1: 200 units @ $12 = $2,400
Purchase 2: 150 units @ $15 = $2,250
Total available: 450 units, total cost $5,650
Sold: 300 units
Ending inventory: 150 units

FIFO Calculation:

COGS: 100 @ $10 + 200 @ $12 = $1,000 + $2,400 = $3,400
Ending inventory: 150 @ $15 = $2,250

LIFO Calculation:

COGS: 150 @ $15 + 150 @ $12 = $2,250 + $1,800 = $4,050
Ending inventory: 50 @ $12 + 100 @ $10 = $600 + $1,000 = $1,600

Weighted Average Calculation:

Average cost per unit: $5,650 ÷ 450 = $12.56
COGS: 300 × $12.56 = $3,768
Ending inventory: 150 × $12.56 = $1,882

Comparison Summary:

Method	COGS	Ending Inventory	Gross Profit	Tax Effect
FIFO	$3,400	$2,250	Highest	Higher tax
LIFO	$4,050	$1,600	Lowest	Lower tax
Weighted Avg	$3,768	$1,882	Middle	Middle

Specific Identification Example:

Car dealership: Track each car separately
Car A: Cost $20,000, sold for $25,000
Car B: Cost $22,000, still in inventory
COGS for Car A: $20,000
Ending inventory: $22,000 (Car B)

Important Considerations:

Consistency: Use same method consistently
Disclosure: Must disclose method used
Physical Flow: Method may not match actual physical flow
Tax vs Book: Different methods may be used for tax and financial reporting
LIFO Conformity Rule: If use LIFO for tax, must use for financial reporting (US)
Inventory Layers: LIFO creates layers of inventory at different costs

Choosing a Method:

Use FIFO When:

Want to show higher profits
Inventory prices stable or decreasing
Following IFRS (LIFO not allowed)
Perishable goods (actual flow matches)

Use LIFO When:

Want tax savings in inflation
Prices rising consistently
In US under GAAP
Matching current costs with current revenues

Use Weighted Average When:

Prices fluctuate frequently
Items not distinguishable
Want to smooth profit fluctuations
Simpler calculations desired

Use Specific Identification When:

High-value, unique items
Each item has different cost
Easy to track individual items
Required by nature of items

Financial Statement Impact:

Income Statement: Affects COGS and gross profit
Balance Sheet: Affects inventory asset value
Ratios: Affects current ratio, inventory turnover
Cash Flow: Indirect effect through taxes

Key Points to Remember:

Method choice affects reported profit and taxes
Must be consistent in application
LIFO not allowed under IFRS
Specific identification required for unique items
Physical count required periodically
Disclose method and any changes