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Inventory Valuation | LIFO vs FIFO vs Weighted Average Cost

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As with capital investment, businesses cannot immediately deduct the full cost of inventory purchases against taxable income. Instead, the cost of inventories is deducted when sold. The deduction amount depends on the inventory valuation method. Today’s map shows which of the three main inventory valuation methods European OECD countries require their businesses to use for tax purposes.

Because it would be impractical to track specific inventories, there are three different cost flow assumptions to calculate how much inventory costs should be deducted from taxable income when inventories are sold: First-in, First-out (FIFO); Last-in, First-out (LIFO); and Weighted-Average Cost.

Inventory Valuation Method in Europe 2021, First-in, First-out (FIFO); Last-in, First-out (LIFO);

The map reflects the best inventory valuation method available in a country, with LIFO the most preferred one, Weighted-Average Cost second, and FIFO last. Of the 27 European OECD countries, 11 allow businesses to use LIFO, 11 allow the Weighted-Average Cost method, and five restrict their businesses to FIFO.

The choice of cost flow assumption impacts a business’s taxable income. To illustrate this, assume a business first purchases an item of inventory at $10. Later, if prices have increased, the business may buy a second unit of the same item for $15. Now that the business has two units of this item in its inventory, one of these items is sold for $20.

  • Under FIFO, businesses assume that the first inventory item purchased is the first one to be sold. So FIFO assigns a cost of $10 to the item sold because the first item purchased had a price of $10. The taxable income then is $10 ($20 revenue minus $10 cost).
  • Under LIFO, businesses assume that the last inventory item purchased is the first one to be sold. So LIFO assigns a cost of $15 to the first item sold because that is the price of the most recent item purchased. The taxable income then is $5 ($20 revenue minus $15 cost).
  • Under the Weighted-Average Cost method, businesses assume that the cost of the units sold in any given year is the weighted-average cost of all the available inventories for sale that year. In our example, the unit sold would be valued at $12.50 (average of $10 for the first item and $15 for the second item). This leads to a taxable income of $7.50 ($20 revenue minus $12.50 cost).

As this example shows, the method by which a country allows businesses to account for inventories can significantly impact a business’s taxable income. When prices are rising, as is usually the case due to factors like inflation, LIFO is the preferred method because it allows inventory costs to be closer to true costs at the time of sale. In contrast, FIFO is the least preferred method in this case. The Weighted-Average Cost method is somewhere between FIFO and LIFO.

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