What is a LIFO liquidation, and why does it artificially inflate income?

A LIFO liquidation occurs when a company using the Last-In, First-Out inventory method sells more units than it purchases in a period, causing it to dip into older, lower-cost inventory layers. Because these old layers carry historical costs that may be far below current replacement costs, cost of goods sold (COGS) decreases and reported gross profit increases -- often dramatically.

Why It Matters

The income boost is not from better operations. It is purely an artifact of the cost flow assumption. Analysts should adjust for it because it is non-recurring and potentially misleading.

Worked Example

Redstone Hardware has the following LIFO inventory layers:

In 2025, Redstone sells 11,000 units at $95 each but only purchases 5,000 units at $66 each. It must liquidate old layers to cover the shortfall of 6,000 units (11,000 sold - 5,000 purchased = 6,000 from existing layers).

COGS calculation under LIFO:

• 5,000 units purchased at $66 = $330,000
• 4,000 units from 2024 layer at $62 = $248,000
• 2,000 units from 2021 layer at $48 = $96,000
• Total COGS = $674,000

If Redstone had purchased all 11,000 units at the current $66 cost:

• COGS would be 11,000 x $66 = $726,000

Income Inflation = $726,000 - $674,000 = $52,000

That $52,000 of extra pre-tax income comes entirely from liquidating cheap old layers, not from operational improvement.

Tax Consequence: Higher reported income means higher taxable income and a larger tax bill. This is ironic because companies typically choose LIFO specifically to defer taxes. A LIFO liquidation reverses that benefit.

Exam Tip: When you see a LIFO company with declining inventory quantities, immediately think LIFO liquidation. The exam often asks for the income effect or the tax impact. Calculate the difference between the old-layer cost and the current replacement cost for the liquidated units.

For additional LIFO and inventory analysis practice, explore our CFA Level I FRA question bank.