An NOL valuation allowance is required when management concludes it is more likely than not — greater than a 50% probability — that some or all of the deferred tax asset created by a net operating loss carryforward won’t be realized through future taxable income. The standard comes from ASC 740, and the judgment turns on weighing every available piece of positive and negative evidence, with the heaviest weight given to objectively verifiable facts like the company’s recent profit-and-loss history.
Why the NOL Creates an Asset in the First Place
A net operating loss happens when deductions exceed taxable income for the year. For NOLs arising in tax years beginning after December 31, 2017, the loss carries forward indefinitely and can no longer be carried back, except for narrow categories like certain farming losses.1Internal Revenue Service. Instructions for Form 172 Once carried forward, an NOL can offset up to 80% of taxable income in any future year.2Office of the Law Revision Counsel. 26 U.S. Code 172 – Net Operating Loss Deduction
That future tax savings sits on the balance sheet as a deferred tax asset. The DTA equals the NOL carryforward multiplied by the expected tax rate, which federally is the flat 21% corporate rate. A $50 million federal NOL produces a $10.5 million DTA. But the asset isn’t cash. It only has value if the company earns enough taxable income later to use it, and when the probability of that falls below 50%, a valuation allowance has to reduce the DTA to what the company actually expects to realize.
The More-Likely-Than-Not Threshold
ASC 740 asks a single question: based on the weight of all available evidence, is it more likely than not that the DTA will be realized? If the answer is no for the full asset or any portion of it, a valuation allowance is required for the amount that falls below the threshold.
This isn’t an all-or-nothing call. Management can conclude that $30 million of a $50 million DTA is realizable and record a partial allowance against the remaining $20 million. The analysis also has to be done separately for each tax jurisdiction, because the ability to use an NOL depends on generating income in the same jurisdiction that produced the loss.
The judgment is genuinely hard. Two competent accountants looking at identical facts can land in different places, and this is where most of the disagreement between companies and their auditors happens. The dispute is rarely about math. It’s about how to weigh conflicting evidence.
Four Sources of Future Taxable Income
ASC 740 identifies four sources of future taxable income that can support realization. They’re typically evaluated starting with the most objectively verifiable.3The Tax Adviser. Assessing the Need for a Valuation Allowance
The first is the reversal of existing taxable temporary differences. If a company has deferred tax liabilities on its books, those DTLs represent taxable income that will materialize when the temporary difference reverses. Matching a scheduled DTL reversal against the DTA is the strongest evidence available because neither side is a forecast. The timing and character have to line up, though. A DTL reversing in two years doesn’t help an NOL that would need a decade of income to absorb.
The second is taxable income in prior carryback years. If the law allows carrying an NOL back to a profitable earlier year, the refund of taxes already paid is about as certain as evidence gets. For most companies this source is largely closed off because post-2017 NOLs can’t be carried back, but it still matters for the narrow exceptions.
The third is projected future taxable income, excluding reversing temporary differences and carryforwards. These projections are inherently subjective and carry significantly less weight than the first two sources, especially when the company has been losing money recently. The forecast has to be consistent with the company’s historical performance and the broader industry outlook. A money-losing company can’t project its way out of an allowance with an optimistic hockey-stick chart.
The fourth is tax planning strategies: specific, feasible actions management could take to generate or accelerate taxable income, like selling an appreciated asset or converting tax-exempt investments to taxable ones. The strategy has to be prudent and something management has both the ability and the intent to carry out. A move that would damage the business isn’t feasible even if it would technically produce tax income.
How Positive and Negative Evidence Get Weighed
The core of the analysis is evidence assessment. Each item gets weight based on how objectively verifiable it is. A signed contract guaranteeing future revenue counts more than a management projection. A three-year track record of losses counts more than an analyst’s prediction of recovery.
Cumulative Losses as the Dominant Negative Evidence
The single most damaging piece of negative evidence is a cumulative pretax loss in recent years. ASC 740 calls this “a significant piece of negative evidence that is difficult to overcome.” Practice has converged on the current year plus the prior two years as the standard benchmark, though the codification doesn’t mandate a specific period.
When a company sits in a three-year cumulative loss position, the presumption shifts heavily toward a full valuation allowance. Cumulative losses are objectively verifiable. There’s nothing subjective about them. And under ASC 740, objectively verifiable negative evidence can only be offset by objectively verifiable positive evidence, not by management projections or forecasts. A company in a cumulative loss position that relies on forward-looking earnings estimates to avoid an allowance will have a very hard time defending that conclusion to auditors.
Other negative evidence includes a history of NOLs or tax credits expiring unused, expected losses in upcoming years, and industry or company-specific uncertainties that could hurt future profitability.
Positive Evidence That Can Hold Up
Positive evidence pointing against a valuation allowance includes a strong earnings history, especially when the current loss came from an identifiable non-recurring event like a one-time restructuring charge or a litigation settlement rather than ongoing weakness. Existing contracts or firm sales backlogs are another form of objective evidence, particularly common in defense contracting or long-term infrastructure projects. Appreciated asset values can also support realization, because a sale would generate taxable gain, provided the company actually has the ability and willingness to sell.
The weighting exercise isn’t a checklist. A company might have both a cumulative loss position and a large backlog of signed contracts. Management would then need to demonstrate that the backlog is sufficient in both amount and timing to overcome the loss history. A vague sense that things are turning around never passes muster.
Section 382 Ownership Changes
One factor that dramatically increases the likelihood of needing an allowance is a change in corporate ownership under Section 382 of the Internal Revenue Code. When one or more major shareholders increase their ownership by more than 50 percentage points over a three-year testing period, the company’s ability to use its pre-change NOLs gets permanently capped.4Office of the Law Revision Counsel. 26 USC 382 – Limitation on Net Operating Loss Carryforwards and Certain Built-In Losses Following Ownership Change
The annual cap equals the fair market value of the loss corporation’s stock immediately before the ownership change, multiplied by the long-term tax-exempt rate published by the IRS. As of early 2026, that rate is 3.58%.5Internal Revenue Service. Revenue Ruling 2026-6 A company worth $100 million at the time of the change could use only about $3.58 million of its pre-change NOLs per year, regardless of how profitable it becomes. Unused portions of the annual limit carry forward, but the restriction can render a large NOL practically useless if the company’s value was low when the change happened.
For valuation allowance purposes, the DTA must be assessed based on the amount actually available after the §382 cap, not the gross NOL balance. Companies emerging from bankruptcy or completing major acquisitions often face this, and it frequently triggers a full or near-full allowance even when the company is currently profitable.
State-Level Analysis Can Land Differently
The federal indefinite carryforward and 80% limitation are only part of the picture. The analysis has to be done separately for each state where the company has NOL carryforwards, and state rules vary widely. Roughly 19 states and the District of Columbia conform to the federal framework. The rest diverge.
About a dozen states limit carryforward periods to 20 years. Another dozen impose shorter windows, some as brief as five years. A handful cap the dollar amount of losses that can be carried forward, and several have periodically suspended NOL deductions altogether during fiscal crises. States with gross receipts taxes rather than corporate income taxes don’t offer NOL deductions at all.
Because state carryforward periods are often shorter than the federal indefinite period, a company might conclude its federal NOL is fully realizable while simultaneously needing a valuation allowance for the same NOL at the state level. A company operating in 30 states might reach 30 different conclusions.
Recording, Releasing, and the Earnings Impact
Recording a valuation allowance means debiting income tax expense and crediting the allowance account. The DTA is then presented on the balance sheet net of the allowance. A company with a $10 million gross DTA and a $6 million allowance reports a net DTA of $4 million.
The income statement effect can be severe. A company recording a large allowance for the first time will report significantly higher tax expense and lower earnings even if operating performance hasn’t changed. For public companies this often triggers sharp stock price declines, because investors read it as management conceding that future profitability is in doubt.
Releasing the allowance works in reverse. There’s no bright-line rule requiring a specific number of profitable quarters, but the most common trigger is the company achieving a three-year cumulative pretax profit — effectively the mirror image of the evidence that forced the allowance to begin with. The release debits the allowance and credits income tax benefit, flowing through the income statement and increasing reported net income. A large release can produce a dramatic one-time earnings boost, sometimes resulting in extremely low or even negative effective tax rates for the period.
Interim Reporting
Valuation allowance changes don’t always flow through the estimated annual effective tax rate used for interim reporting. When a DTA originates in the current year and management expects an allowance will be needed by year-end, that expected allowance gets built into the annual effective tax rate and spread across quarters.
Changes in judgment about allowances on beginning-of-year DTAs are treated differently. If a company decides mid-year to increase or decrease an allowance that existed at the start of the year, the change is recognized as a discrete item in the quarter the judgment changes, not spread across remaining quarters. A single quarter can absorb the entire income statement impact of a significant adjustment, which produces the kind of earnings volatility that draws analyst questions.
Disclosure and Regulatory Scrutiny
Companies must disclose the total change in the valuation allowance during each reporting period and discuss the evidence considered in reaching their conclusion.3The Tax Adviser. Assessing the Need for a Valuation Allowance Footnotes typically break out NOL carryforward amounts by jurisdiction, identify when carryforwards expire, and explain the nature of the temporary differences giving rise to DTAs and DTLs.
For public companies, the SEC actively reviews these disclosures and often issues comment letters asking for more detail. A common question asks the company to explain exactly how it weighed each piece of positive and negative evidence, particularly when the company is in a cumulative loss position but has not recorded a full allowance, or when the company is releasing a previously established allowance. The SEC wants a “why now” explanation: what specific change in facts or circumstances justified the change in judgment.6SEC. SEC Response Letter Vague language about improving market conditions or management confidence typically draws follow-ups.
The determination is also a prime area for auditor scrutiny and is frequently identified as a critical audit matter. Auditors focus on whether management’s projections are consistent with historical performance, whether the weighting of evidence is defensible, and whether the disclosed rationale is complete. Companies that underestimate the documentation burden here tend to find out during the audit, when options narrow quickly.