ASC 820 is the section of U.S. GAAP that defines fair value and sets a single method for measuring it. Under ASC 820, fair value measurement is an exit-price concept: the price you would receive to sell an asset, or pay to transfer a liability, in an orderly transaction between market participants at the measurement date. The standard organizes inputs into a three-level hierarchy, prefers observable market data over internal assumptions, and requires disclosures that scale with how much judgment the number rests on.
What Fair Value Means Under ASC 820
Fair value is the price a knowledgeable, independent buyer and seller would agree on in a normal market transaction at a specific date. That date is the measurement date, and every input has to be relevant as of that moment. The question the standard asks is not what you paid for the asset, and not what you plan to do with it. The question is what you could get for it right now.1U.S. Securities and Exchange Commission. ASC 820-10 Fair Value Measurements and Disclosures
An orderly transaction assumes the asset has been exposed to the market for a customary marketing period. Forced liquidations and distressed sales do not count. If a company sells at a steep discount because it needs cash by Friday, that price does not represent fair value. The buyer and seller must also be acting in their own economic self-interest, independent of each other, and knowledgeable about what they are trading.
Because the measurement is market-based rather than entity-specific, your company’s particular intent for the asset is mostly beside the point. What matters is how the broader market would price it.
When ASC 820 Applies and When It Doesn’t
ASC 820 is only a measurement standard. It tells you how to compute fair value, never when to use it. That trigger comes from other GAAP topics. ASC 350 requires a fair value measurement when testing goodwill for impairment, and ASC 820 supplies the methodology.2Deloitte Accounting Research Tool. Quantitative Assessment Step 1 ASC 805 requires assets and liabilities acquired in a business combination to be recorded at fair value on the acquisition date, and again ASC 820 tells you how.
Several areas are carved out. Share-based compensation under ASC 718 follows its own fair value rules. Inventory measurements under ASC 330 use lower-of-cost-or-net-realizable-value, which resembles fair value but rests on different principles. Standalone selling prices used in revenue recognition under ASC 606 can incorporate entity-specific factors that ASC 820 would not permit. Lease classification and measurement under ASC 840 and 842 operate under separate guidance. Derecognition of nonfinancial assets under ASC 610-20 follows its own rules.
The common thread is that each exception involves a number that looks like fair value but intentionally departs from the pure exit-price framework. Applying ASC 820’s hierarchy and disclosures to a carved-out item would be wrong.
Which Market’s Price You Use
Every fair value measurement assumes a specific market. ASC 820 requires the principal market for the asset or liability, meaning the market with the greatest volume and level of activity for that item. If no principal market exists, you use the most advantageous market: the one that maximizes what you would receive for an asset, or minimizes what you would pay to transfer a liability, after considering transaction costs and transportation costs.
Here is where a common trap lives. Transaction costs like broker commissions and legal fees help you identify which market is most advantageous, but they do not reduce the fair value number itself. Fair value is a gross figure. Transportation costs are different: if getting the asset to its principal market is a characteristic of the asset, those costs do adjust the final measurement.3Financial Accounting Standards Board. Accounting Standards Update 2011-04 Fair Value Measurement
You do not need to be able to actually execute a sale on the measurement date. As long as you can access the principal market, its price governs.
How to Calculate the Number
ASC 820 recognizes three broad valuation approaches. The choice depends on the nature of the item, the availability of market data, and one guiding principle: use observable inputs where you can, and rely on internal assumptions only where you must.3Financial Accounting Standards Board. Accounting Standards Update 2011-04 Fair Value Measurement Once you pick an approach, apply it consistently over time unless circumstances change enough to justify switching.
Market Approach
The market approach uses prices from actual transactions in identical or comparable items. For a commercial building, that means recent sale prices of similar properties adjusted for differences in size, condition, or location. For financial instruments, it might mean quoted prices for similar bonds or valuation multiples from comparable transactions. The strength of the approach depends on the quality of the comparables. When good ones exist, the results tend to be defensible. When they are scarce and require heavy adjustment, the measurement is less reliable.
Income Approach
The income approach converts expected future amounts into a single present-day figure.3Financial Accounting Standards Board. Accounting Standards Update 2011-04 Fair Value Measurement Discounted cash flow is the most common version: project future cash flows, then discount them back using a risk-adjusted rate. Other techniques include the multi-period excess earnings method, often used for customer relationships and technology intangibles, and relief-from-royalty models for trademarks and patents.
Every income-approach technique shares the same vulnerability. Small changes in the discount rate or the terminal growth assumption can swing the result significantly. A half-percentage-point shift in the discount rate on a long-lived asset can move the value by millions, which is why auditors look hard at these inputs.
Cost Approach
The cost approach estimates what it would cost today to replace the service capacity of an asset. You start with current replacement cost and then adjust downward for three types of obsolescence: physical deterioration from wear and tear, functional obsolescence where the asset is outdated compared to modern alternatives, and economic obsolescence from external factors like declining demand or regulatory changes.3Financial Accounting Standards Board. Accounting Standards Update 2011-04 Fair Value Measurement The logic is simple: a rational buyer would not pay more than the cost of a substitute with equivalent usefulness. The approach works well for specialized tangible assets like a custom production line. It is less useful for financial instruments or intangibles, where replacement cost is hard to quantify.
The Fair Value Hierarchy
The three-level input hierarchy is the backbone of ASC 820. It ranks the inputs feeding a measurement by observability, meaning how directly the data comes from actual market transactions rather than internal estimates. The classification of the overall measurement is determined by the lowest-level input that is significant to the calculation as a whole. If a model uses mostly Level 1 and Level 2 data but one significant input is Level 3, the whole measurement is Level 3.
Level 1 Inputs
Level 1 inputs are quoted prices in active markets for identical assets or liabilities that the entity can access at the measurement date. They are the most reliable evidence of fair value and must be used without adjustment whenever available.3Financial Accounting Standards Board. Accounting Standards Update 2011-04 Fair Value Measurement Publicly traded stocks, exchange-traded derivatives, and U.S. Treasury securities are classic Level 1 items: an active market, an identical asset, a directly observable price.
One rule catches people off guard. ASC 820 prohibits blockage factors at any level of the hierarchy. A blockage factor is a discount reflecting the market impact of selling a large position at once. Even if dumping your entire holding would depress the price, you cannot reduce fair value for that reason. The size of your holding is not a characteristic of the asset.
Level 2 Inputs
Level 2 inputs are observable data other than Level 1 quoted prices. You land here when a quoted price for the identical item in an active market is not available, but you can still anchor the measurement in market-based data. If the item has a specified contractual term, the Level 2 input must be observable for substantially the full term.3Financial Accounting Standards Board. Accounting Standards Update 2011-04 Fair Value Measurement
Common Level 2 inputs include quoted prices for similar items in active markets, quoted prices for identical items in markets that are not very active, directly observable market data like interest rates and implied volatilities, and inputs derived from or corroborated by observable market information.
Adjustments to Level 2 inputs are sometimes needed, for example to reflect differences in credit quality or restrictions on sale. As long as those adjustments themselves rest on observable data, the measurement stays in Level 2. The moment a significant adjustment relies on unobservable assumptions, it drops to Level 3.
Level 3 Inputs
Level 3 inputs are unobservable. They reflect the entity’s own assumptions about how a market participant would price the item. Level 3 comes into play when little or no market activity exists, which is common for private equity investments, complex structured products, and certain long-dated derivatives.
The entity can use its own internal data such as cash flow projections, but the assumptions must still reflect what a market participant would use, not what the entity hopes for. If reasonably available information suggests market participants would use different assumptions, that information has to be incorporated. This is where the hardest judgment lives, and where auditors spend disproportionate time. Small shifts in unobservable inputs move the number significantly, and the pressure to shade assumptions in a favorable direction is real.
Transfers Between Levels
Instruments can move between levels as market conditions change. When an active market goes quiet, an item might migrate from Level 1 to Level 2 or Level 3. The entity must disclose transfers and apply a consistent policy for when to recognize them. Options include the beginning of the reporting period, the end of the period, or the actual date of the triggering event. Whatever the policy, it applies symmetrically to transfers in and transfers out. Determining what counts as a “significant” Level 3 input requires judgment; there is no bright-line percentage.
Measuring Liabilities at Fair Value
Measuring a liability comes with a twist that does not apply to assets. ASC 820 requires you to assume the liability is transferred to another party, not settled or paid off. The question is what a market participant would demand to take the obligation on.
When no quoted price exists for the liability itself, look at the identical item from the other side. If a market participant holds that liability as an asset, use the asset’s quoted price. Where that is not available either, apply valuation techniques as you would for an asset, using the same hierarchy.
The most counterintuitive piece is nonperformance risk, which includes the entity’s own credit risk. The fair value of a liability must reflect the possibility that the entity will not fulfill the obligation. When a company’s credit deteriorates, the fair value of its liabilities decreases, because a market participant taking on that riskier promise would pay less for it. On paper, that produces a gain in earnings for a company whose financial health is declining, a result that has confused and frustrated investors since the concept was introduced. For instruments measured under the fair value option in ASC 825, changes attributable to the entity’s own credit risk must be reported separately.
Highest and Best Use for Non-Financial Assets
For non-financial assets like real estate, equipment, or natural resources, ASC 820 requires you to measure fair value based on the asset’s highest and best use from a market participant’s perspective, even if the entity is using the asset differently. The concept does not apply to financial assets or liabilities.3Financial Accounting Standards Board. Accounting Standards Update 2011-04 Fair Value Measurement
Highest and best use must be physically possible given the asset’s characteristics, legally permissible under zoning and other regulations, and financially feasible. Take a downtown surface parking lot. If zoning permits a high-rise, and the economics of building one work, the fair value of the land reflects its value as a development site, not as a parking lot. The entity’s current use does not enter the measurement.
Once highest and best use is set, the measurement also requires a valuation premise. The in-use premise applies when the asset’s value is maximized alongside other assets, for example a specialized machine that only has value within a functioning production line. The in-exchange premise applies when a buyer would pay more for the asset on a standalone basis.
The NAV Practical Expedient
For certain investments in funds, partnerships, and similar structures, ASC 820 permits a practical expedient: use the investee’s reported net asset value per share, or an equivalent measure like partner capital allocations, as a proxy for fair value. The expedient is optional and comes with conditions. The investee’s NAV must be calculated on a fair-value basis consistent with ASC 946, the investment company standard. It must also be measured as of the reporting entity’s own measurement date, not simply the most recent statement the fund happened to issue. If there is reason to believe the reported NAV is not a reasonable approximation, the expedient should not be used without a supportable adjustment.
Investments measured under the NAV practical expedient are not classified within the three-level hierarchy. They sit outside it and are disclosed separately, with information about the nature and risks of the investment, any unfunded commitments, and any restrictions on redemption.4Financial Accounting Standards Board. Accounting Standards Update 2015-07 Fair Value Measurement Disclosures for Investments
Day-One Differences Between Transaction Price and Fair Value
What if the fair value of an asset or liability at initial recognition differs from the transaction price? If you pay $100 for a derivative and your model says it is worth $105 on the same day, can you book a $5 gain immediately? Usually not.
ASC 820 acknowledges that transaction price and fair value can diverge at inception. The transaction might be between related parties, the seller might be under duress, the unit of account in the transaction might differ from the unit of account for the measurement, or the transaction might have occurred in a different market than the principal market. In many cases, though, recording an immediate gain would be inappropriate because the model has not been validated by actual market activity. The practical answer is calibration: if you plan to use the same pricing model for subsequent measurements, calibrate it so its output at inception equals the transaction price. Some topics, like embedded derivative accounting under ASC 815, have specific rules that override this general approach.
Disclosure Requirements
ASC 820’s disclosures scale with subjectivity. The more judgment in the measurement, the more you have to tell readers about it. Disclosures apply to assets and liabilities measured at fair value on a recurring basis, like trading securities, and on a non-recurring basis, like an impaired asset written down only when a specific event triggers the measurement.
For every class of asset or liability, the entity discloses the fair value amount, its level in the hierarchy, and a description of the valuation techniques and inputs. For non-recurring measurements, the entity also explains what triggered the measurement.
Level 3 Roll-Forward
The heaviest requirements fall on recurring Level 3 measurements. Entities present a full reconciliation of opening and closing balances, showing total gains and losses separated between amounts recognized in net income and amounts in other comprehensive income, together with the specific line items where they appear. Purchases, sales, issuances, and settlements are shown separately. Transfers into and out of Level 3 are disclosed, with explanations for each.
Entities also disclose the unrealized gains and losses for the period that relate to instruments still held at the reporting date. That figure tells readers how much of the Level 3 movement is on paper rather than realized.
Quantitative Inputs and Sensitivity
For significant Level 3 measurements, entities describe each unobservable input, the range of values used, and a weighted average or other quantitative summary where practicable. A discount rate assumption ranging from 8% to 14% tells the reader something real about the uncertainty. Entities also describe the sensitivity of the fair value to changes in unobservable inputs. If a reasonable shift in the discount rate or a credit loss assumption would produce a materially different result, that has to be stated plainly. Where multiple Level 3 inputs interact, so that changing one affects the impact of another, the interrelationships must be described as well. These sensitivity disclosures are often the most useful part of the footnote for an investor trying to gauge how much confidence to place in the number.
Recent Change: ASU 2022-03
ASU 2022-03, effective for public companies for fiscal years beginning after December 15, 2023, clarified how to measure the fair value of equity securities that carry a contractual sale restriction. The amendment establishes that a contractual restriction preventing sale is not part of the unit of account. It is a characteristic of the holding entity, not of the security itself. The fair value measurement uses the price in the principal market with no discount for the restriction.5Financial Accounting Standards Board. Accounting Standards Update 2022-03 Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions
The update also requires specific disclosures for equity securities subject to contractual sale restrictions: the fair value of those securities, the nature and remaining duration of the restrictions, and any circumstances that could cause the restrictions to lapse. For entities holding restricted equity positions, common in venture capital and private equity, the change removed a long-running area of inconsistency in practice.