A finance and accounting concept defining a method, measure, or process used to record activity and support financial decisions. It specifies how value, risk, or performance is measured or controlled through standardized rules and routines. It does not ensure correctness without reliable inputs, appropriate assumptions, and effective review and controls. It materially affects decisions and compliance by shaping how organizations allocate capital, report results, and manage exposure. The concept is generally stable, though standards, regulation, and tools evolve over time.

Principle

Charge current period cost of goods sold with the cost of the latest purchases or productions, preserving consistent application and disclosure of the method and its effects on profit and tax.

Demonstration

A company buys 100 units at $10 and later 100 units at $12. If 120 units are sold under LIFO, COGS = (100 × $12) + (20 × $10) = $1,400 and ending inventory = (80 × $10) = $800.

Misapplication

Applying LIFO in reporting jurisdictions where it is prohibited for external financial reporting, or using LIFO layers improperly so that inventory records do not reconcile to physical quantities.

Consequence

In periods of rising prices, LIFO tends to increase cost of goods sold and reduce reported profit and ending inventory compared with FIFO, which can lower taxable income under tax rules that permit LIFO.

Reversal

FIFO assumption, which assigns oldest costs to COGS first and normally results in higher reported profit and inventory values during inflationary periods.

Boundary

LIFO is an accounting cost-flow convention; it may be permitted under some GAAP but is not allowed under IFRS for external reporting, and it requires careful layer accounting and disclosure.

Semantic Tension

Tension between LIFO’s tax or profit-smoothing benefits and criticisms that it may distort economic representation of inventory values, particularly when physical flows differ from accounting layers.

Synthesis

LIFO treats the newest cost layers as sold first, shifting recent costs into COGS and older costs into ending inventory; it affects profit, taxes and balance-sheet valuation and must be used consistently and disclosed.