If your company holds shares of another business as an investment, the accounting is governed by ASC 321, the part of the FASB Accounting Standards Codification that deals with investments in equity securities. The headline rule is simple to state: most equity securities are carried at fair value, and the changes in fair value run through net income each period. Whether the stock went up or down, that swing shows up in earnings.
Where it gets interesting is the investment nobody can easily price, like a stake in a private company with no public market. ASC 321 gives those holdings a practical off-ramp called the measurement alternative, so you are not forced to hunt for a fair value every reporting date. Knowing which path an investment takes, fair value or the measurement alternative, is most of the battle.
This guide walks through what ASC 321 covers, how equity securities are measured, what readily determinable fair value means, when you can use the measurement alternative, and how all of this differs from the rules for debt securities and credit losses. The aim is to make a technical standard genuinely usable, whether you are closing the books or reviewing someone else's.
ASC 321 applies to investments in equity securities and to other ownership interests treated as equity securities, such as interests in partnerships, unincorporated joint ventures, and limited liability companies. It provides the framework for the accounting for equity interests you hold as investments. If you hold an equity interest or other equity instruments in another entity as an investment, ASC 321 is usually the starting point.
Just as important is what falls outside the scope of ASC 321. Investments where you control the other company are consolidated, not accounted for here. Investments that give you significant influence, generally holdings that let you affect the other company's decisions, fall under the equity method in ASC 323 instead. And debt securities are not equity at all, so they follow ASC 320. The standard exists in its current form because ASU 2016-01 pulled equity securities out of the old combined debt and equity securities model and gave them their own home, changing how many companies report investment gains and losses. If you are brushing up on where investments sit in the statements, our guide on reading financial statements is a helpful companion.
For equity securities within the scope of ASC 321, the default is clean. You measure the investment at fair value on each reporting date, and any change in fair value since the last measurement goes straight to net income. There is no parking gains in other comprehensive income and waiting to sell, which is how the old rules often worked. Under ASC 321, the volatility hits earnings as it happens.
That single design choice has real consequences for financial reporting. A company holding marketable stock can see its reported net income swing simply because the market moved, even if it never touched the position. For preparers, it means the fair value measurement has to be refreshed every period, and for readers of the statements, it means investment gains and losses in earnings may not reflect any actual buying or selling. It is worth understanding before those swings show up in the numbers.
The measurement path forks based on one question: does the equity security have a readily determinable fair value? A security has a readily determinable fair value when quoted prices are available, essentially when it trades on an exchange or an over-the-counter market and you can look up what it is worth.
Publicly traded stock clears that bar easily, so those investments are simply measured at fair value. The harder case is an equity security without a readily determinable fair value, like shares in a private company that does not trade anywhere. For those, hunting down a defensible fair value every quarter can be costly and subjective, which is exactly the problem the next rule solves.
For equity securities without a readily determinable fair value, ASC 321 lets an entity elect the measurement alternative, a practical expedient set out in ASC 321-10-35-2. Instead of fair value at every reporting date, the investment is measured at its cost, minus any impairment, plus or minus observable price changes.
The observable price change is the key mechanic. If there is an orderly transaction for the identical or a similar investment of the same issuer, say the private company raises a new funding round at a known price per share, you adjust the carrying amount up or down to reflect it. Between those events, the investment just sits at its adjusted cost. This keeps the accounting grounded in real, observable data points rather than forcing a fresh valuation each period. The election is made investment by investment, and once you apply the measurement alternative to a holding, you keep using it until either a readily determinable fair value appears or you choose to switch to fair value.
Choosing the measurement alternative does not let you ignore bad news. Each reporting period, the entity has to consider whether the investment is impaired, using a qualitative assessment of factors like the investee's earnings, its business outlook, and any events that suggest the holding is worth less than its carrying amount.
If that assessment says the investment is impaired, you write it down to its fair value at that date, and the loss is reported in earnings. This is a one-directional safety valve on top of the observable-price-change mechanism: observable transactions can move the carrying amount either way, but an impairment finding always brings it down to fair value. Getting the impairment call right takes judgment, which is one reason many companies lean on outside support for these positions.
A couple of related choices are worth knowing. Even when the measurement alternative is available, an entity can simply elect to measure an equity security at fair value instead, and for certain fund investments, a net asset value practical expedient under ASC 820 can stand in for fair value. Separately, the fair value option under ASC 825 lets entities elect fair value for some financial assets that would not otherwise be carried that way.
These are not everyday elections for most companies, but they matter when the fact pattern fits, and they can meaningfully change how an investment shows up in the statements. Because the choices interact with disclosure requirements and are generally sticky once made, they are worth thinking through before adoption rather than after.
Here is a distinction that trips people up. The fair value and measurement alternative rules are for equity. Investments in debt securities are a different world: they live in ASC 320 and are classified as trading, available-for-sale, or held-to-maturity, each with its own measurement.
Debt also brings in credit losses, and equity does not. The current expected credit loss model in ASC 326 applies to financial assets like debt securities and receivables, requiring an estimate of expected losses. Equity securities under ASC 321 are simply not subject to that credit losses analysis, because you either mark them to fair value or run the measurement alternative. One recent development on the debt-and-receivables side is worth flagging: in July 2025 the FASB issued ASU 2025-05, which gives entities a practical expedient for the measurement of credit losses on current accounts receivable and contract assets, effective for fiscal years beginning after December 15, 2025. It is a credit losses change under ASC 326, not an ASC 321 change, but it is the kind of update that lands in the same accounting research and close process, so it is good to have on your radar.
Worth saying plainly. ASC 321 looks tidy on paper, but the work is in the details: tracking fair value each period, applying the measurement alternative correctly, spotting observable price changes, and testing an investment for impairment, all while keeping the disclosures clean. On a busy close, these are easy positions to get wrong.
That is the kind of work we take on at Madras Accountancy. As an offshore accounting and audit and assurance partner to U.S. CPA firms, we help measure equity investments under ASC 321, document measurement alternative elections and observable price changes, run impairment assessments, and prepare the support that stands up in review. Since 2015 we have handled detailed financial reporting work like this, including complex GAAP areas like our lease accounting support. If your firm has clients with investment portfolios or private-company stakes, talk to our team and we will take it from there.
What is ASC 321? ASC 321 is the section of the FASB Accounting Standards Codification that governs accounting for investments in equity securities. It also covers other ownership interests treated as equity securities, such as certain partnership, joint venture, and LLC interests. The core rule is that equity securities are measured at fair value, with changes in fair value recognized in net income each period. For equity securities without a readily determinable fair value, entities may instead elect a measurement alternative. ASC 321 was created by ASU 2016-01, which separated equity securities from the older debt and equity securities model.
How are equity securities measured under ASC 321? Most equity securities within the scope of ASC 321 are measured at fair value on each reporting date, and the change in fair value is reported in net income, not other comprehensive income. If an equity security does not have a readily determinable fair value, the entity has a choice: measure it at fair value, or elect the measurement alternative, which uses cost minus impairment plus or minus observable price changes. Either way, the goal is to reflect the current value of the investment in the financial statements.
What is a readily determinable fair value? An equity security has a readily determinable fair value when quoted sales prices or quotations are currently available, generally because it trades on a securities exchange or an over-the-counter market. Publicly traded stock has a readily determinable fair value, so it is measured directly at fair value. A private company investment that does not trade anywhere usually does not have a readily determinable fair value, which is what makes the security eligible for the measurement alternative under ASC 321 instead of a full fair value measurement each period.
What is the measurement alternative under ASC 321? The measurement alternative is a practical expedient in ASC 321-10-35-2 for equity securities that do not have a readily determinable fair value. Rather than remeasuring fair value every reporting date, the entity carries the investment at cost, less any impairment, plus or minus observable price changes from orderly transactions for the identical or a similar investment of the same issuer. When the investee raises money at a known price, for example, the carrying amount is adjusted up or down. It reduces the cost and subjectivity of valuing hard-to-price holdings.
What is in the scope of ASC 321? ASC 321 covers investments in equity securities and other ownership interests treated as equity securities, including certain interests in partnerships, joint ventures, and LLCs. It does not cover investments that are consolidated because you control the company, investments accounted for under the equity method in ASC 323 because you have significant influence, or debt securities, which fall under ASC 320. Determining whether a holding is within the scope of ASC 321 or one of those other standards is the first step in the analysis.
Are equity securities subject to credit losses (CECL)? No. The current expected credit loss model in ASC 326 applies to financial assets such as debt securities, loans, and receivables, not to equity securities. Equity securities under ASC 321 are measured at fair value or under the measurement alternative, so they are not run through a credit losses estimate. This is a common point of confusion because debt and equity investments sit near each other in the codification, but only the debt side and receivables carry a credit losses requirement.
What did ASU 2025-05 change? ASU 2025-05, issued by the FASB in July 2025, is a credit losses update under ASC 326, not an ASC 321 change. It provides a practical expedient, available to all entities, for estimating expected credit losses on current accounts receivable and contract assets that arise from revenue transactions, allowing an entity to assume current conditions at the balance sheet date hold for the asset's remaining life. It is effective for fiscal years beginning after December 15, 2025. It affects receivables, but it is worth knowing alongside the investment standards.
How does Madras Accountancy help with ASC 321? Madras Accountancy supports CPA firms with the financial reporting work behind ASC 321. As an offshore accounting and audit partner, we help measure equity securities at fair value each period, apply and document the measurement alternative for holdings without a readily determinable fair value, track observable price changes, perform impairment assessments, and prepare the disclosures and workpapers that hold up in review. Because these positions require judgment and consistent documentation, firms rely on us to keep them clean. You can reach our team through the contact link above.
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