Other-than-temporary impairment (OTTI) is an accounting conclusion that a drop in the market value of an investment security is not a passing dip but a loss unlikely to reverse, requiring the company to move the loss out of a balance sheet reserve and onto the income statement. The term is now largely historical. For debt securities it has been replaced by the current expected credit loss (CECL) model under ASC 326, and for most equity securities the impairment test has been eliminated entirely because those holdings are now marked to fair value through net income each period. A narrower version of the concept survives for a specific class of equity investments, and the old three-step test still shows up in older financial statements and in audit discussions, so it is worth knowing what OTTI meant and what took its place.
What the Old OTTI Test Actually Required
Before the recent standards, OTTI was the dominant framework for deciding when an unrealized loss on an investment security had to hit earnings. The test was subjective, backward-looking, and required a triggering event before any loss was recognized. It ran in three steps, and reaching a “yes” at any step forced the loss into net income.
Step One: Intent or Requirement to Sell
The first question was whether management intended to sell the impaired security, or whether the company was likely to be forced to sell it before its value recovered. Indicators of intent included a security that had been approved for sale, was being marketed at roughly fair value, or was sold shortly after the balance sheet date under circumstances suggesting the decision predated it. If either intent or a likely forced sale existed, the entire unrealized loss moved from the balance sheet into net income immediately, and the analysis stopped.
Step Two: Ability to Hold
If management neither intended nor expected to be forced to sell, the next question was whether the company had the financial capacity to hold the security long enough for its value to recover. That involved reviewing liquidity, funding sources, and any regulatory or contractual constraints. Without the capacity to hold, the full loss went to earnings, the same outcome as step one.
Step Three: Credit Loss Analysis
Where both intent and ability to hold were present, the final step asked whether management would recover the full amortized cost of the security. Management estimated the present value of cash flows expected to be collected, discounted at the security’s original effective interest rate. If that present value fell short of amortized cost, a credit loss existed. The credit-related portion of the loss was recognized in net income; any remaining fair value decline attributable to non-credit factors, such as interest rate movements, stayed in other comprehensive income (OCI).
The central weakness of the framework was its backward-looking nature. A loss had to have already occurred before recognition was triggered, which often delayed the inevitable and concentrated losses into crisis periods.
What Replaced OTTI, and When
Two accounting updates dismantled the OTTI framework as it applied to most securities.
ASU 2016-01 overhauled the accounting for equity securities. Equity investments with readily determinable fair values are now carried at fair value with all changes running directly through net income each period. That eliminated the need for any impairment test on those securities because gains and losses hit earnings automatically.
ASU 2016-13 introduced CECL for debt instruments, codified in ASC 326. CECL replaced the old incurred-loss approach with a forward-looking estimate of lifetime expected credit losses from the moment a debt security lands on the balance sheet, using historical loss experience, current conditions, and reasonable forecasts of future economic activity. The FDIC confirms that CECL took effect for large SEC filers in fiscal years beginning after December 15, 2019, and for all other entities, including smaller reporting companies, in fiscal years beginning after December 15, 2022.1FDIC. Current Expected Credit Losses (CECL) By 2026, every reporting entity subject to U.S. GAAP has adopted CECL, and OTTI is no longer relevant terminology for debt securities.
Trading securities were already marked to market through net income, so they never went through an OTTI analysis. Investments accounted for under the equity method fall under a separate impairment framework entirely, outside both the old OTTI rules and CECL.
How CECL Handles the Two Debt Categories
For held-to-maturity (HTM) securities, the company establishes an allowance for credit losses against the amortized cost basis.2National Credit Union Administration. CECL Accounting Standards Each period, the allowance is reassessed, and any increase or decrease runs through the income statement as credit loss expense. If credit conditions improve, the company reverses a portion of the previously recorded loss, producing a gain.
Available-for-sale (AFS) debt securities use a split approach. When fair value drops below amortized cost, management separates the decline into a credit portion and a non-credit portion. The credit loss is measured by comparing the present value of expected cash flows, discounted at the security’s effective interest rate, to amortized cost. Any shortfall is recognized in net income through an allowance for credit losses rather than a direct write-down of the asset.2National Credit Union Administration. CECL Accounting Standards The allowance is capped at the total fair value decline, creating a “fair value floor” so the credit loss cannot exceed the overall unrealized loss. The non-credit portion stays in OCI, keeping rate-driven volatility out of core earnings.
A key difference from OTTI: CECL does not ask whether management intends or is able to hold the security. The expected credit loss estimate applies regardless of holding plans.
Where an OTTI-Style Write-Down Still Applies
The one area where an impairment concept still operates in something close to the old form is the “measurement alternative” under ASC 321. This applies only to equity securities without readily determinable fair values where management has elected to carry them at cost, adjusted for observable price changes and reduced by any impairment. The rules explicitly drop the “other than temporary” label, but the analytical process feels familiar.
At each reporting period, management performs a qualitative assessment looking for indicators that fair value has dropped below carrying value. The codification lists several:
- A significant decline in the investee’s earnings, credit rating, asset quality, or business outlook.
- Major negative changes in the investee’s regulatory, economic, or technological environment.
- A significant downturn in the investee’s geographic region or industry.
- A bona fide offer to buy, an offer by the investee to sell, or a completed auction for the same or a similar investment at a price below carrying value.
- Negative operating cash flows, working capital shortfalls, or violations of debt covenants or regulatory capital requirements.
If these indicators suggest impairment, management estimates the security’s fair value. Where fair value falls below carrying amount, the difference is recognized as a loss in net income and the carrying value is written down. There is no threshold for how large the decline must be, and no ability to avoid the write-down by arguing the decline is temporary. The loss establishes a new, lower cost basis. Unlike AFS debt securities under CECL, there is no allowance mechanism, so the write-down is permanent in the accounting records even if the investment later recovers. Any future recovery is picked up only when an observable price change occurs or the security is sold.
How the Loss Appears on the Financial Statements
The reporting treatment depends on the type of security and the standard that governs it.
For equity securities under the measurement alternative, an impairment loss flows directly into net income as a write-down. The carrying value drops to fair value and that becomes the new cost basis, and the write-down itself cannot be reversed.
For AFS debt securities under CECL, the credit loss hits net income through a provision for credit losses, recorded via an allowance account rather than by writing down the asset directly. The non-credit portion of the fair value decline sits in OCI. The income statement reflects only credit risk, while the balance sheet still shows the security at fair value. Because the allowance can be reversed, an improvement in credit conditions produces a credit gain, though the allowance cannot be reversed below zero.
For HTM debt securities under CECL, the allowance for credit losses offsets amortized cost on the balance sheet, and changes to the allowance run through the income statement each period. There is no OCI component because HTM securities are not carried at fair value.
Tax Treatment Does Not Follow the Accounting
Booking an impairment loss under GAAP does not automatically produce a tax deduction, and the mismatch catches people off guard.
For securities held as capital assets, federal tax law under IRC Section 165(g) allows a deduction only when a security becomes “wholly worthless” during the tax year.3Office of the Law Revision Counsel. 26 USC 165 – Losses The loss is treated as if the security were sold on the last day of the tax year and is subject to the normal limitations on capital losses. The IRS applies the same treatment to worthless securities that have been abandoned.4Internal Revenue Service. Losses (Homes, Stocks, Other Property) 1
A partial impairment recorded for accounting purposes, where the security still has some value, generally does not generate a tax deduction until the security is actually sold or becomes completely worthless. A company can report a significant impairment loss on its income statement while receiving no current tax benefit, and the timing difference between book and tax recognition creates a deferred tax asset on the balance sheet.
One exception involves domestic corporations that own securities in affiliated domestic corporations. If the affiliate’s stock becomes worthless and certain ownership and gross receipts tests are met, the loss is treated as an ordinary loss rather than a capital loss, which is more favorable.3Office of the Law Revision Counsel. 26 USC 165 – Losses
For financial institutions setting CECL allowances, the interaction between the accounting provision and tax-deductible bad debt reserves is governed by separate rules that have been the subject of recent regulatory proposals aimed at simplifying compliance. Tax treatment varies depending on whether the institution is a bank, thrift, or credit union, and remains an area where professional tax guidance is particularly valuable.