Inventory revaluation under GAAP versus IFRS comes down to two structural differences that change what shows up on the income statement. GAAP splits companies into two measurement tracks depending on their cost flow method and treats every write-down as permanent. IFRS applies one measurement rule to everyone and lets a company reverse a prior write-down, up to the original cost, when the conditions that caused it go away. The same facts can produce meaningfully different earnings under the two frameworks, which is why anyone comparing companies across reporting regimes has to adjust for the asymmetry.
When a Write-Down Is Required
Inventory stays on the balance sheet at original cost until something makes that cost unrecoverable. Three triggers do most of the work.
Physical deterioration is the plainest: damaged, spoiled, or degraded goods lose value in proportion to the damage. Obsolescence moves faster and hits harder, and it dominates in consumer electronics, fashion, medical devices, and anything else tied to shifting technology or taste. A general decline in market prices is the third trigger. If a competitor undercuts your selling price, raw material costs fall industrywide, or the costs to complete and sell the goods rise enough to eat the margin, the inventory is worth less than you paid.
How GAAP Measures the Write-Down
ASC 330 governs inventory measurement under US GAAP, and the specific rule a company applies depends on its cost flow assumption. FASB simplified the rule for most companies in 2015 but carved out LIFO and retail inventory users, which is why two tests coexist.
LCNRV for FIFO and Average Cost
Companies using First-In, First-Out or Average Cost apply the Lower of Cost or Net Realizable Value rule. Net realizable value is the price you expect to get, less the costs to finish the product and sell it. A widget expected to sell for $100 that needs $5 of finishing work and $10 in commissions has an NRV of $85. If original cost exceeds NRV, you write inventory down to NRV. If cost is lower, you leave it alone. ASU 2015-11 introduced this simplified test for companies not on LIFO or the retail method.1Financial Accounting Standards Board. ASU 2015-11 Inventory Topic 330
LCM for LIFO and the Retail Method
Companies using Last-In, First-Out or the Retail Inventory Method must apply the older Lower of Cost or Market rule. FASB explicitly excluded these methods from the LCNRV simplification.1Financial Accounting Standards Board. ASU 2015-11 Inventory Topic 330 LCM requires three values, and the middle one becomes “market.”
- Ceiling: net realizable value. Inventory can never be carried above what you can recover from selling it.
- Floor: net realizable value less a normal profit margin, where the margin is the historical spread between cost and selling price for that product.
- Replacement cost: what it would cost today to buy or reproduce the same inventory.
Line up the three, take the middle number, and compare it to original cost. Use whichever is lower. The floor keeps a write-down from being so aggressive that selling the goods later would inflate profit; the ceiling keeps carrying value from exceeding recoverable amount.
Write-Downs Are Permanent
Once inventory is written down under either LCNRV or LCM, the reduced amount becomes the new cost basis. GAAP does not allow reversals even if market conditions fully recover. Write $50,000 off in the third quarter and watch prices bounce back in the fourth: the loss stays. This one-way ratchet is the sharpest difference between GAAP and IFRS.
How IFRS Measures the Write-Down
IAS 2 requires inventory to be measured at the lower of cost and net realizable value regardless of cost flow method.2IFRS. IAS 2 Inventories No LCM rule, no three-value comparison, no split by cost flow method. Every company runs the same test: if NRV falls below cost, write inventory down to NRV. The NRV calculation is the same as under GAAP: estimated selling price less estimated costs of completion and estimated costs to make the sale.3International Financial Reporting Standards (IFRS). IAS 2 Inventories
Reversals Are Allowed
The consequential difference is that IFRS permits reversing a prior write-down when the circumstances that caused it no longer exist. If a product was written down because a competitor launched a cheaper alternative, and that competitor later exits the market, NRV can recover and the company reverses some or all of the original write-down.2IFRS. IAS 2 Inventories
There is a hard cap. The carrying amount after reversal cannot exceed the inventory’s original cost before the write-down. You can recover lost ground but never carry inventory above what you originally paid. The reversal reduces cost of goods sold in the period it occurs, which lifts reported gross profit and net income for that period.
LIFO Is Prohibited
IAS 2 permits only FIFO, weighted average cost, and specific identification. LIFO is not allowed at all. The LCM rule that LIFO companies apply under GAAP has no counterpart in IFRS. A company converting from GAAP to IFRS that currently uses LIFO faces both a method change and a potential revaluation adjustment.
The Differences That Move the Numbers
Three points separate the two frameworks in practice.
- Measurement framework: GAAP splits companies into two groups, LCNRV for FIFO and average cost and LCM for LIFO and retail. IFRS uses one LCNRV rule for everyone.
- Reversal of write-downs: GAAP locks in every write-down permanently. IFRS allows reversals up to original cost when conditions improve.
- Permitted cost flow methods: GAAP allows LIFO. IFRS does not.
The reversal asymmetry is where analysts spend the most time. An IFRS reporter can post a write-down in one year and report improved profitability the next partly because of the reversal. Under GAAP that recovery never touches earnings. Compare two companies in the same industry across a period of price volatility, one under each framework, and the reported earnings trends can diverge even when the underlying economics are identical.
Recording the Entry
Two booking approaches are common, and they differ mainly in how visible the loss is on the face of the statements.
Direct Method
The simple version folds the loss into cost of goods sold: debit cost of goods sold, credit inventory. Inventory drops immediately and cost of sales rises by the same amount. The trade-off is transparency. The write-down disappears into normal cost of sales, so financial statement users cannot easily see how much of the period’s reduced profit came from impairment rather than ordinary activity.
Allowance Method
The allowance method keeps the loss visible. The company credits a contra-asset account, often called “Allowance to Reduce Inventory to NRV,” and debits a separate “Loss on Inventory Write-Down” expense. The loss becomes its own line on the income statement, and the balance sheet shows gross inventory alongside the allowance. If gross inventory is $500,000 and the allowance is $50,000, net carrying value is $450,000. The audit trail is cleaner and analysts have more to work with. In practice, immaterial adjustments tend to flow through cost of goods sold while material impairments get broken out.
The IFRS Reversal Entry
When an IFRS reporter reverses a prior write-down, the entry mirrors the original. A $30,000 reversal debits inventory and credits cost of goods sold, reducing cost of sales and lifting gross profit for the period. The cap still applies: carrying value after reversal cannot exceed the pre-write-down cost.
Disclosure Requirements
Both frameworks require companies to describe how they value inventory and to flag significant write-downs. What has to be disclosed follows directly from what each framework allows.
Under IAS 2, an IFRS reporter discloses the accounting policies used for inventory measurement, the total carrying amount, the amount of any write-down recognized as an expense during the period, and the amount of any reversal recognized as a reduction of expense, along with the circumstances that led to the reversal.3International Financial Reporting Standards (IFRS). IAS 2 Inventories The reversal disclosure has no GAAP equivalent, because GAAP has no reversal to disclose.
SEC registrants under GAAP follow Regulation S-X, which requires disclosure of the major classes of inventory, the basis for determining inventory amounts, and the cost flow method.4eCFR. 17 CFR Part 210 – Form and Content of Financial Statements LIFO companies must also disclose the excess of replacement or current cost over stated LIFO value when material. Management’s Discussion and Analysis must describe unusual events that materially affected reported income, including inventory adjustments, and disclose anticipated write-downs reasonably likely to cause a material change in the relationship between costs and revenues.5eCFR. 17 CFR 229.303 – Management’s Discussion and Analysis of Financial Condition and Results of Operations
The Book-Tax Boundary
The financial accounting write-down and the tax deduction for inventory losses run on different tracks and do not always produce the same result. For federal income tax purposes, taxpayers using lower-of-cost-or-market determine “market” based on aggregate current bid prices for the basic cost elements of inventory on hand: direct materials, direct labor, and required indirect costs.6GovInfo. 26 CFR 1.471-4 – Inventories at Cost or Market, Whichever Is Lower This is conceptually similar to the replacement cost piece of GAAP’s LCM rule, but the IRS applies its own definitions and documentation standards.
LIFO taxpayers face an additional constraint. The LIFO conformity rule requires that if you use LIFO for tax, you must also use it for financial reporting. A LIFO taxpayer can apply lower-of-cost-or-market for book without violating conformity, but the tax return must use actual LIFO cost.7IRS. Practice Unit – LIFO Conformity A book write-down under LCM does not automatically translate to a tax deduction of the same amount for a LIFO taxpayer.