Write-down accounting is the practice of reducing an asset’s recorded value on the balance sheet to match what the company can actually recover from it, with the shortfall recognized immediately as a loss on the income statement. The mechanics differ by asset type, the tax consequences rarely match the book entry, and under U.S. GAAP the reduction is almost always permanent.
What a Write-Down Is
A write-down happens when an asset’s book value (its original cost minus accumulated depreciation) exceeds what the company can realistically recover from that asset. The unrecoverable portion becomes a loss, reducing reported income for the period.
It is not depreciation. Depreciation spreads an asset’s cost over its useful life in a predictable pattern, governed for tax purposes by 26 U.S.C. §167 and §168.1Office of the Law Revision Counsel. 26 USC 167 – Depreciation2Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System A write-down is sudden and event-driven. You don’t plan for it the way you plan a depreciation schedule.
It also differs from a write-off. A write-down is a partial reduction; the asset still has some value, just less than the books show. A write-off removes the asset’s value entirely, treating it as worthless. The mechanics overlap, but the distinction matters for classifying the loss and figuring out its tax treatment.
What Signals a Write-Down Is Needed
Write-downs don’t happen on a schedule (goodwill aside). Something has to signal that the asset’s recorded value may no longer be recoverable. The signals fall into two groups.
External signals include a steep drop in the asset’s market price, unfavorable changes in the legal or regulatory environment, or an economic downturn that undermines demand for what the asset produces. If the market is telling you an asset is worth less than your books say, that’s the clearest signal.
Internal signals are often more subtle: physical damage, technological obsolescence, or a major shift in how the asset is being used. A pattern of operating losses tied to a particular asset group is one of the strongest indicators that a formal recoverability test is needed. A single bad quarter doesn’t necessarily demand a write-down, but sustained losses combined with declining projections should prompt a hard look at the numbers.
From here, the accounting treatment forks. Inventory follows one set of rules, and long-lived assets follow another.
Recording an Inventory Write-Down
Inventory follows the lower of cost or net realizable value rule. If inventory is carried at a cost higher than what you can actually sell it for (after subtracting the costs to complete and sell it), the recorded value drops to that lower net realizable value. FASB codified this in ASU 2015-11, which applies to inventory measured under any method other than LIFO or the retail inventory method.3FASB. Accounting Standards Update 2015-11 – Inventory Topic 330
Net realizable value is the estimated selling price in the normal course of business, minus reasonably predictable costs to finish, sell, and ship the goods. When that figure falls below cost, the difference is recognized as a loss immediately.
The journal entry debits a loss or expense account and credits the inventory account (or a contra-asset allowance account). Most companies run the loss through cost of goods sold, which reduces gross profit for the period. If the write-down is unusually large, some companies use a separate loss line so investors can see it on the income statement. Either approach is acceptable. The point is the same: the loss hits the income statement in the period it’s identified, not when the inventory is eventually sold or scrapped. The rule applies across raw materials, work-in-process, and finished goods alike.
Recording a Long-Lived Asset Write-Down
Property, equipment, and intangibles use an impairment framework rather than the lower-of-cost-or-NRV test. The process depends on whether you’re testing tangible assets or goodwill.
Property, Plant, and Equipment
Tangible long-lived assets use a two-step approach under ASC 360-10. Step one is the recoverability test: compare the asset group’s carrying amount to the total undiscounted future cash flows expected from using and eventually disposing of those assets. If the undiscounted cash flows exceed the carrying amount, the asset passes. No write-down, even if fair value happens to be lower than book value.
If the asset group fails step one, step two measures the loss. The impairment loss equals the amount by which carrying value exceeds fair value. Fair value often requires an independent appraisal or a discounted cash flow analysis. The journal entry debits an impairment loss account and credits the asset account directly, reducing it to fair value. That new, lower book value becomes the basis for all future depreciation calculations.4SEC. SEC Staff Accounting Bulletin No. 100
The two-step structure trips people up. Step one uses undiscounted cash flows, which sets a relatively low bar for passing. An asset can have a fair value well below its book value and still pass the recoverability test if total expected cash flows (without discounting) exceed the carrying amount. That’s why many expected write-downs never materialize: undiscounted cash flows are almost always higher than discounted fair value.
Goodwill
Goodwill (the premium paid in an acquisition above the fair value of identifiable net assets) has its own model. Unlike tangible assets, goodwill must be tested for impairment at least once a year, whether or not any triggering event has occurred. Testing happens at the reporting unit level, typically an operating segment or one level below it.5FASB. Accounting Standards Update 2017-04 – Simplifying the Test for Goodwill Impairment
FASB simplified goodwill testing in 2017 by eliminating the old second step, which had required a hypothetical purchase price allocation. Under the current approach, you compare the fair value of the entire reporting unit to its carrying amount, including goodwill. If carrying amount exceeds fair value, you recognize an impairment loss equal to that excess. The loss is capped at the total goodwill allocated to that reporting unit, so the write-down can never push goodwill below zero.5FASB. Accounting Standards Update 2017-04 – Simplifying the Test for Goodwill Impairment The required footnote disclosures must explain the facts and circumstances that led to the impairment and how fair value was determined.
Where a Write-Down Lands on the Financial Statements
A write-down touches all three primary statements, and knowing where it lands matters whether you’re preparing the numbers or reading them.
Income Statement
The impairment loss shows up as an expense, reducing pre-tax income and net income for the period. Inventory write-downs typically flow through cost of goods sold. Long-lived asset and goodwill impairments usually appear on a separate line. Either way, earnings per share drops.
Balance Sheet
The asset’s carrying value falls by the amount of the write-down, shrinking total assets. The offsetting reduction flows through retained earnings in the equity section, because the loss reduces net income, which in turn reduces the cumulative earnings that feed retained earnings. A smaller equity base can affect debt-to-equity ratios and loan covenants.
Cash Flow Statement
An impairment loss is a non-cash charge. No money leaves the bank account when a write-down is recorded. On the cash flow statement prepared under the indirect method, the impairment loss is added back to net income in the operating activities section, so the statement reflects actual cash from operations rather than the accounting adjustment.
A Book Loss Is Not Automatically a Tax Deduction
Recording a write-down on the financial statements does not automatically create a tax deduction. Book accounting (GAAP) and tax accounting (the Internal Revenue Code) follow different rules, and the timing and amount of recognized losses often diverge.
Under 26 U.S.C. §165, a taxpayer can deduct “any loss sustained during the taxable year and not compensated for by insurance or otherwise.” But the deductible amount is based on the asset’s adjusted tax basis, not its book value or fair market value. Business losses from trade or business activities and profit-seeking transactions are generally deductible; individual loss deductions are more restricted.6Office of the Law Revision Counsel. 26 USC 165 – Losses
Practically, a GAAP impairment based on fair value may not match the tax loss the IRS allows. The deductible loss depends on when and how the asset is disposed of, abandoned, or becomes worthless for tax purposes, and it’s calculated from the asset’s tax basis rather than its accounting book value. This gap between book and tax creates a temporary (and sometimes permanent) difference that has to be tracked for deferred tax accounting.
The gap is widest for goodwill. Under GAAP, acquired goodwill is never amortized. It sits on the balance sheet until an impairment test triggers a write-down. Under the tax code, goodwill acquired in a qualifying transaction is a Section 197 intangible and amortized ratably over 15 years, whether the acquired business is thriving or struggling.7Office of the Law Revision Counsel. 26 USC 197 – Amortization of Goodwill and Certain Other Intangibles A GAAP impairment charge on goodwill does not accelerate or change the 15-year tax amortization schedule. The two systems run on independent tracks.
Can You Reverse a Write-Down Later?
Under U.S. GAAP, almost never. Once a long-lived asset or goodwill has been written down, the reduced value becomes the new permanent carrying amount. If fair value rebounds the following quarter, you cannot write it back up. The post-impairment carrying amount is the new cost basis for all future accounting purposes. The same prohibition applies to inventory: once written down, GAAP does not allow reversal.
IFRS is different. Under IAS 36, impairment losses on assets other than goodwill can be reversed in a later period if the estimates used to measure the recoverable amount have changed. The reversal increases the asset’s carrying amount, but only up to what it would have been (net of depreciation) had the original impairment never been recognized. Even under IFRS, goodwill impairment is permanent.8IFRS Foundation. IAS 36 Impairment of Assets
This matters if you’re comparing companies across frameworks. An IFRS filer might reverse a prior impairment and show improved asset values and higher income during a recovery, while a U.S. GAAP filer with the same economic improvement cannot. Knowing which framework governs the numbers you’re reading prevents apples-to-oranges comparisons.