- Global Frameworks: IAS 2 (Inventories), US GAAP ASC 330.
1. Inventory Cost Flow Assumptions
The choice of inventory cost flow assumption directly alters cost of goods sold, net income, cash flow, and asset values.
- FIFO (First-In, First-Out): Assumes the oldest units bought are sold first. During inflationary periods, FIFO assigns older, lower costs to COGS, which increases net income but leads to higher corporate income tax liabilities. Balance sheet inventory values reflect current market replacement costs.
- LIFO (Last-In, First-Out – US GAAP Only): Assumes the newest units bought are sold first. In inflationary environments, LIFO matches current, higher costs with current revenues, which lowers reported net income and reduces tax payments.
- LIFO Conformity Rule: The US Internal Revenue Service (IRS) mandates that if a firm uses LIFO for tax optimization, it must also use LIFO for public financial reporting.
- IFRS Prohibition: IFRS bans LIFO because it does not match actual physical inventory flows.
- Weighted Average Cost: Smooths price fluctuations by allocating the total cost of available goods evenly across all units.
2. Inventory Valuation Adjustments
- IFRS Standard: Inventory must be measured at the lower of cost or Net Realizable Value (NRV), where NRV is the estimated selling price minus completion and disposal costs.
- US GAAP Standard: Inventory is measured at the lower of cost or NRV for firms using FIFO or Weighted Average. For firms using LIFO, inventory is measured at the lower of cost or Market Value, where market value is capped between the NRV and NRV minus a normal profit margin.
3. LIFO Reserve adjustments for Global Comparison
To compare a US LIFO-reporting firm with an international FIFO-reporting competitor, financial analysts use the mandatory LIFO Reserve disclosure:
Inventory (FIFO) = Inventory (LIFO) + LIFO Reserve
COGS (FIFO) = COGS (LIFO) − Δ LIFO Reserve
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