In-depth Notes on Inventory Valuation Methods

FIFO and LIFO Inventory Valuation Methods

FIFO (First-In, First-Out): This method assumes that the first inventory purchased is the first sold. Thus, the ending inventory comprises the latest purchases, which are valued at the most recent prices paid to suppliers. For example, if a company purchased items at different costs over a period, the items sold first will reflect the older costs, while the remaining inventory will reflect newer prices.

LIFO (Last-In, First-Out): Conversely, LIFO assumes that the last inventory purchased is the first sold. In this scenario, the ending inventory consists of the oldest costs. This method can lead to older prices being reflected in the closing inventory values, potentially underrepresenting the current market value if prices are rising.

FIFO Calculation Example

Let’s consider an example: On May 1, a company begins with 20 units at $5 each, followed by a receipt of 30 units at $6 each on May 12. Then, they issue 25 units on May 13. On May 20, they receive another 20 units at $8 each and later issue 35 units on May 26, which leaves them with a closing balance of 10 units.

The transactions can be structured as follows:

  • 1 May: Opening balance 20 units at $5 = $100
  • 12 May: Received 30 units at $6 = 180, Total balance = 50 units =$280
  • 13 May: Issued 25 units = 25 units left (20 from opening and 5 from the latest cost)
  • 20 May: Received 20 units at $8 = 160, Total balance = 45 units = $300
  • 26 May: Issued 35 units = 10 units left.

The closing inventory under FIFO will be calculated at the latest prices for the remaining units. In practice, purchases are noted separately to account for the different prices paid.

Key Observations:

  • Sales are taken from the oldest inventory first.
  • Issues of materials reflect the earliest prices.
  • The closing balance reflects prices relevant to the most recent purchases.

LIFO Calculation Example

In a situation very similar to FIFO, consider computations for LIFO. Starting with the same inventory movements:

  • 1 May: Opening balance 20 units at $5 = $100
  • 12 May: Received 30 units at $6 = 180, Total 50 units = $280
  • On 13 May, when the 25 units are issued, they would come from the most recently received costs at $6 (hence 25 units at $6 = $150).
  • Following that, on May 20, with the new receipt at $8, the closing balance of 10 units reflects the oldest prices for the remaining materials.

Key Observations:

  • Issues come from the most recent purchases.
  • Highlights potential market price behavior but may not reflect how products are used in reality.

Weighted Average Cost Method (CWA and PWA)

Cumulative Weighted Average (CWA): This method averages the costs every time inventory is received. The cumulative cost divided by the total units available yields the new average.

Periodic Weighted Average (PWA): This calculates a single average cost at the end of an accounting period, which is then applied uniformly to all issues during that period. Both methods use the average for all transactions until a new purchase reset occurs.

Closing Inventory Considerations

For closing inventory under different methods:

  • FIFO reflects the cost of the most recently acquired units.
  • LIFO may introduce discrepancies due to market value not being reflected properly.
  • CWA and PWA help mitigate fluctuations in price but may still result in outdated costing under certain conditions.

Practice Calculations: T-Shirt Company Example

  • FIFO Closing Inventory Calculation could reveal values depending on recent transactions similar to the prior methods.
  • LIFO takes a similar structure but derives values differently based on the method of accounting for material costs during inventory issues.

Inventory Management Considerations

Holding inventory incurs expenses: storage, financing, and maintenance. Thus, minimizing inventory through strategies like Just-in-Time (JIT) can reduce costs but comes with risks such as stockouts. Buffer stock may also be held to accommodate delays or variable demand.

Summary of Inventory Methods

When examining the effects of inflation or deflation on inventory valuation:

  • In inflationary times, FIFO generally results in higher profits due to lower costs reflected in the cost of goods sold (COGS).
  • Conversely, LIFO may result in lower net income during inflation as it reflects higher purchase costs for the goods sold.
  • The Weighted Average method may create moderate results between FIFO and LIFO effects.