To calculate goodwill impairment under ASC 350, subtract the reporting unit’s fair value from its carrying amount; the difference is the impairment loss, capped at the total goodwill assigned to that unit. If fair value equals or exceeds carrying amount, there is no impairment. The arithmetic is simple. Almost everything hard about the calculation happens before the subtraction: pinning down what belongs in the carrying amount, and defending the fair value figure you plug in.
Build the Reporting Unit’s Carrying Amount
The calculation happens at the reporting unit level, not the entity level. A reporting unit is typically an operating segment or one level below it, meaning the lowest level at which management reviews discrete financial information. Every dollar of goodwill on the balance sheet has to be assigned to a reporting unit at the acquisition date, and it stays there for testing purposes.
Goodwill gets assigned to whichever reporting units are expected to benefit from the acquisition’s synergies, even if the acquired company’s tangible assets and liabilities end up scattered elsewhere. When an acquired business becomes its own reporting unit and no synergies spread to existing units, all of the goodwill stays with the new unit. When synergies flow across multiple units, ASC 350 permits either an approach that mirrors the original acquisition accounting or a “with-and-without” method that measures each unit’s fair value with and without the acquired business. The chosen method must be reasonable, supportable, and applied consistently.
Once goodwill is assigned, build the carrying amount by aggregating all assets attributed to the unit (at historical cost, adjusted for depreciation and amortization) and subtracting all liabilities attributed to it. The assigned goodwill is part of that total. This is one side of the impairment comparison, and getting it wrong distorts everything downstream.
Determine the Reporting Unit’s Fair Value
Fair value here is the price a willing buyer would pay for the reporting unit in an orderly transaction. Two valuation approaches carry the load, and most impairment analyses use both and reconcile the results. Relying on a single method is harder to defend if auditors or regulators push back.
Income Approach
The income approach uses a discounted cash flow model. Analysts project the unit’s revenue, expenses, and capital needs, typically over five to ten years, then discount those cash flows back to present value using a rate based on the unit’s weighted average cost of capital. A terminal value captures worth beyond the projection window, usually with a modest long-term growth assumption. Small changes in the discount rate or growth rate can swing the answer by millions, so the assumptions are where judgment concentrates.
Market Approach
The market approach compares the reporting unit to similar publicly traded companies or recent acquisitions, applying valuation multiples such as enterprise value to EBITDA, price-to-earnings, or revenue multiples. The multiples come from genuinely comparable businesses, and the data has to be current and reflect the industry’s specific risks.
Control Premium
When you measure a reporting unit’s fair value by reference to quoted market prices of its equity, consider whether a hypothetical buyer would pay a premium for control: the ability to direct strategy, capture synergies, and access cash flows unavailable to a minority shareholder. A control premium can push fair value above market capitalization, and that gap is sometimes what separates an impairment charge from a clean test. The SEC expects any control premium to be grounded in comparable transaction data or identifiable cash flow benefits. An arbitrary percentage chosen because it avoids an impairment will not survive review.
Impairment-testing valuations are complex enough that many companies engage certified valuation professionals. Fees range from a few thousand dollars for a straightforward single unit to six figures for companies with multiple segments and heavier regulatory scrutiny.
Apply the Formula and the Cap
Under the single-step framework adopted through ASU 2017-04, the impairment loss equals:
Carrying amount of the reporting unit − Fair value of the reporting unit = Impairment loss
Take a reporting unit with a carrying amount of $5,000,000 and a fair value of $4,200,000. The impairment loss is $800,000.
The cap matters. The loss can never exceed the total goodwill assigned to that unit. If the carrying amount exceeds fair value by $3 million but the unit only has $2 million of goodwill on the books, the impairment charge is $2 million. The remaining $1 million shortfall points to problems with other assets, which are analyzed separately under different standards.
Adjust for Deferred Taxes When Goodwill Is Tax-Deductible
When goodwill is tax-deductible, which happens in taxable acquisitions, the calculation gets circular. Writing goodwill down for book purposes doesn’t change the tax basis, so the book-tax gap widens. That widening increases a deferred tax asset (or shrinks a deferred tax liability), which pushes the carrying amount back up, which means the carrying amount once again exceeds fair value.
Breaking the loop requires solving a simultaneous equation that accounts for the impairment and its tax effect at once. The final goodwill write-down ends up larger than the initial gap. From ASC guidance: a preliminary impairment of $100 at a 40 percent tax rate produces a $40 deferred tax benefit that pushes carrying value back above fair value. Solving simultaneously yields a final impairment charge of $167, offset by a $67 deferred tax benefit on the income statement. Total carrying amount lands at fair value, but the goodwill write-down is substantially larger than it first appeared. The cap still holds: even with the circularity, the total impairment loss cannot exceed the goodwill assigned to the unit.
Know When You Have to Run the Calculation
Every reporting unit with goodwill must be tested at least once each fiscal year. The annual test can be performed on any date, but the same date has to be used in future years. Many companies align it with the fiscal year-end close.
Between annual tests, an interim test is required whenever events or circumstances make it more likely than not that a reporting unit’s fair value has dropped below its carrying amount. ASC 350-20-35-3C lists triggering events:
- Macroeconomic deterioration: rising interest rates, credit tightening, or a general downturn
- Industry and market shifts: increased competition, regulatory changes, or a declining market for the unit’s products
- Cost pressures: significant increases in raw materials, labor, or other inputs that compress margins
- Declining financial performance: negative or falling cash flows, revenue shortfalls against projections
- Entity-specific events: loss of key personnel, major litigation, or a restructuring
- Reporting unit changes: disposing of a significant portion of a unit or a change in the composition of its net assets
A sustained drop in the company’s share price also warrants attention. None of these events automatically means goodwill is impaired, but any of them can force a quantitative analysis ahead of schedule.
The Optional Qualitative Screen
ASC 350 lets you perform a qualitative assessment, sometimes called Step 0, before running the numbers. The question is whether it is more likely than not, meaning greater than 50 percent, that the reporting unit’s fair value has fallen below its carrying amount. Management reviews the same categories of factors listed above plus anything else bearing on the unit’s value. If the odds come out at 50 percent or less, no quantitative test is required for that period.
Step 0 is optional, and the documentation has to be strong. Auditors will scrutinize the reasoning behind a decision to skip the quantitative test, so the file needs to show the factors considered, the weight given to each, and the conclusion drawn. Companies expecting a difficult answer often skip Step 0 and go straight to the calculation.
Record the Loss
The charge hits the financial statements in two places. On the income statement, it appears as a separate line within operating expenses, reducing net income for the period. On the balance sheet, goodwill is written down to its new, lower value.
Under U.S. GAAP, reversing a previously recognized goodwill impairment loss is prohibited. Even if the reporting unit recovers the following year and its fair value climbs well above carrying amount, the goodwill stays written down. The charge does not affect cash flow directly because no money leaves the company, but it signals that the original acquisition has not delivered the value management projected.
Private Company Alternative Changes What You’re Calculating
Private companies and not-for-profit organizations have options public companies don’t. Under ASU 2014-02, eligible private entities can elect to amortize goodwill on a straight-line basis over ten years, or a shorter useful life if one can be demonstrated. Goodwill shrinks automatically each year under this election, so the carrying amount subject to testing is already declining.
Companies that make the amortization election still test for impairment, but only when a triggering event occurs, not on a fixed annual schedule. A separate election under ASU 2021-03 allows these entities to evaluate triggering events only as of the reporting date rather than monitoring continuously. The two elections are independent. When a trigger does surface, the calculation itself works the same way: compare the reporting unit’s fair value to its carrying amount and record the excess as the loss, capped at assigned goodwill.