ASC 330
Active
Inventory
Governs inventory measurement, including lower of cost and net realisable value (LCNRV) for FIFO and weighted-average, and lower of cost or market (LCM) for LIFO and retail methods.
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Conceptual Framework Linkage
Cost capped by recoverability
Inventory is generally carried at COST – the price actually paid to acquire or produce it – but a Conceptual-Framework-level concern arises if that cost genuinely exceeds what the inventory can realistically be sold for. ASC 330 exists to ensure inventory is never carried above its recoverable amount, while still anchoring measurement in historical cost as the primary basis.
The single most famous US GAAP/IFRS accounting difference
ASC 330's permission of the LIFO cost formula, against IAS 2's explicit prohibition of it, is arguably THE most widely known specific accounting difference between the two frameworks – taught in virtually every introductory comparative accounting course, and still fully live and unresolved today.
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Scope & Applicability
All entities holding inventory
ASC 330 applies to inventory held by all entities for sale in the ordinary course of business, in the process of production for such sale, or to be currently consumed in producing goods/services for sale – the same general scope IAS 2 covers.
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Cost Basis – the Move to LCNRV (ASU 2015-11)
A deliberate convergence step toward IAS 2
ASU 2015-11 (effective 2017) simplified inventory measurement for MOST entities, moving from the old "LOWER OF COST OR MARKET" (LCM) test – a complex three-way comparison involving replacement cost, net realisable value, and net realisable value less a normal profit margin – to "LOWER OF COST AND NET REALISABLE VALUE" (LCNRV) – a SIMPLER, single comparison. This was a DELIBERATE step toward aligning with IAS 2's own long-standing NRV-based approach.
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A Partial Convergence – LIFO/Retail Method Still Use LCM
The convergence has a carve-out
ASU 2015-11's simplification to LCNRV applies ONLY to inventory measured using FIFO or the WEIGHTED-AVERAGE cost method. Inventory measured using LIFO or the RETAIL INVENTORY METHOD CONTINUES to use the OLDER, more complex "lower of cost or market" (LCM) test – meaning US GAAP inventory measurement today is genuinely SPLIT: LCNRV for FIFO/average-cost inventory, but LCM for LIFO/retail-method inventory.
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LIFO – the Headline US GAAP/IFRS Divergence
Permitted here, explicitly prohibited under IFRS
US GAAP explicitly PERMITS the LAST-IN-FIRST-OUT (LIFO) cost formula – assuming the most recently acquired inventory items are sold FIRST, leaving older costs in ending inventory. IAS 2 explicitly PROHIBITS LIFO entirely – no IFRS preparer may use it.
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The LIFO Reserve Disclosure
A distinctly US disclosure concept
Entities using LIFO must disclose the "LIFO RESERVE" – the DIFFERENCE between the inventory's LIFO-based carrying amount and what it would have been under FIFO – enabling users to adjust LIFO-based figures for comparability with FIFO-reporting entities (including virtually all IFRS preparers).
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LIFO Liquidation
A distortive event unique to LIFO reporting
If inventory quantities DECLINE during a period, older, LOWER-cost LIFO "layers" from prior years are liquidated and matched against CURRENT revenue – producing an artificially INFLATED gross margin relative to current replacement costs. This is a well-known LIFO-specific distortion that cannot arise under IFRS, since LIFO itself is prohibited there.
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Cost Formulas Available
A broader menu than IFRS's
Cost formulaUS GAAPIFRS (IAS 2)
FIFO✓ Permitted✓ Permitted
Weighted-average✓ Permitted✓ Permitted
Specific identification✓ Permitted✓ Permitted
Retail inventory method✓ Permitted✓ Permitted
LIFO✓ Permitted✕ PROHIBITED
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Full Absorption Costing
Converged with IAS 2
Manufacturing inventory cost includes direct materials, direct labour, and an ALLOCATED portion of both variable and fixed PRODUCTION OVERHEADS (full absorption costing) – the SAME approach IAS 2 requires, allocating fixed overheads based on NORMAL production capacity, with abnormal amounts of waste/idle facility expense expensed as incurred.
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Worked Example – LCNRV Application
Writing inventory down to net realisable value
Example: FIFO inventory below cost
A FIFO-costed inventory item has a cost of $80 per unit. Its estimated selling price is $95, with estimated costs to complete and sell of $20.
Net realisable value = $95 − $20 = $75. Since $75 (NRV) is LOWER than $80 (cost), the inventory is written down to $75 per unit – a $5 per-unit write-down recognised as an expense.
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Worked Example – LIFO Reserve Disclosure
Reconciling LIFO to FIFO for comparability
Example: Disclosing the gap between reported and FIFO-equivalent inventory
An entity's inventory is reported at $12,000,000 under LIFO. Management determines the same inventory would have been valued at $15,500,000 under FIFO.
The entity discloses a LIFO reserve of $3,500,000 ($15,500,000 − $12,000,000) – allowing a user to add back $3,500,000 to inventory for a more comparable analysis with FIFO (or IFRS) reporters.
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Disclosure Requirements
What ASC 330 requires
Basis for stating inventories and the cost method usedLIFO reserve, for LIFO usersSignificant unusual write-downs and the circumstances giving rise to them
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Critical Judgments & Estimates
Where judgement matters most
SIGNIFICANT JUDGEMENTS
Selecting a cost formula (including whether to elect LIFO), and applying it consistentlyWhether write-downs are unusual enough to warrant separate disclosure
SIGNIFICANT ESTIMATES
Estimated net realisable value, including selling price and costs to complete and sellNormal production capacity, for fixed overhead allocation purposes
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ASC 330 vs IAS 2 – Comprehensive Comparison
Comparison – ASC 330 vs IAS 2
FeatureUS GAAP (ASC 330)IFRS (IAS 2)
LIFO permitted?YESNO – explicitly prohibited
Write-down testLCNRV (FIFO/average cost) OR LCM (LIFO/retail method)LCNRV uniformly, for all cost formulas
Reversal of a prior write-downNOT permitted – once written down, the new lower value becomes the new cost basisPERMITTED if circumstances change, reversed up to the original cost
Full absorption costingYes, based on normal capacityYes – fully converged
The WRITE-DOWN REVERSAL prohibition under US GAAP (versus IAS 2's permitted reversal) is a second, less famous but still significant divergence.
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Statement Mapping
Where every ASC 330 event lands
EventStatement(s) affectedNotes
Inventory write-down to LCNRV/LCMBS ISRecognised as an expense (typically COGS)
LIFO liquidation eventISOlder, lower-cost layers matched against current revenue
LIFO reserve disclosureNotes onlyReconciles reported LIFO figures to a FIFO-equivalent basis
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Related Topics
Cross-reference map
TopicConnection
ASC 606Revenue – determines when performance obligations are satisfied, triggering cost recognition
ASC 705Cost of Sales and Services – supplies the corresponding cost of goods sold presentation
ASC 250Governs accounting for a voluntary change in cost formula, such as switching from LIFO to FIFO
Quick-reference glossary preview
LIFO reserve
The difference between an entity's LIFO-based inventory carrying amount and what it would have been under FIFO, disclosed for comparability purposes.
LIFO liquidation
A distortive event where declining inventory quantities cause older, lower-cost LIFO layers to be matched against current revenue, inflating reported gross margin.
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Quick-Reference Glossary
Lower of cost and net realisable value (LCNRV)
The simplified inventory write-down test applicable to FIFO and weighted-average costed inventory since ASU 2015-11.
Lower of cost or market (LCM)
The older, three-way comparison test still required for LIFO and retail-method inventory.
Financial statement key
BS Balance sheet
IS Income statement
SE Statement of changes in equity
OCI Other comprehensive income
SCF Statement of cash flows