Fair Value Hierarchy (Level 1/2/3)
The fair value hierarchy established under ASC 820 classifies the inputs used to measure fair value into three levels based on their observability, ranging from quoted prices in active markets (Level 1) to unobservable, entity-developed assumptions (Level 3), with the level assigned reflecting the least observable input used in a given measurement.
ASC 820, Fair Value Measurement, defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date — an exit price notion. To improve comparability and transparency across entities measuring assets and liabilities at fair value, FASB created a three-level input hierarchy that classifies the quality of evidence underlying any fair value estimate.
Level 1 inputs are quoted prices in active markets for identical assets or liabilities that the entity can access at the measurement date. These are the most reliable inputs because they require no adjustment or judgment — the market price is the fair value. Publicly traded equity securities measured at fair value, on-the-run US Treasury securities, and exchange-traded derivatives are typical Level 1 instruments. An asset or liability cannot be classified as Level 1 if the entity would need to apply a blockage discount (reduction for holding a large position relative to normal trading volume), though an exception applies at the portfolio level under limited circumstances.
Level 2 inputs are observable inputs other than Level 1 quoted prices. These include quoted prices in markets that are not active, quoted prices for similar (not identical) assets in active markets, interest rates and yield curves observable at commonly quoted intervals, credit spreads, and implied volatilities from option prices. Most corporate bonds, interest rate swaps, mortgage-backed securities, and over-the-counter derivatives are classified as Level 2, because their fair values can be derived from observable market data even if no direct market price exists for the specific instrument.
Level 3 inputs are unobservable and reflect the entity's own assumptions about what market participants would use, developed based on the best information available in the circumstances. Level 3 measurements require the most judgment and are thus the least transparent and most susceptible to manipulation or error. Private company equity interests, complex structured products with no active market, certain real estate investments, and long-dated or exotic derivatives often fall into Level 3. FASB requires extensive disclosures for Level 3 assets and liabilities, including reconciliations of opening and closing balances, descriptions of valuation techniques, and quantitative information about significant unobservable inputs.
For investors, the distribution of an entity's fair value measurements across the three levels is a meaningful indicator of the subjectivity embedded in the balance sheet. Banks, insurers, and investment companies with large Level 3 portfolios warrant additional scrutiny, as the reported values depend heavily on internal models and assumptions that are difficult for outsiders to verify. The 2008-2009 financial crisis highlighted this risk, as certain institutions held large Level 3 exposures that ultimately incurred severe losses not reflected in pre-crisis valuations.