A net operating loss valuation allowance is required when management concludes it is more likely than not — meaning greater than 50% probability — that some or all of the deferred tax asset created by the NOL will not be realized through future taxable income. The standard comes from ASC 740, and the decision turns on weighing every piece of available evidence, positive and negative, with the most weight given to objective, verifiable facts like the company’s recent earnings history.
From NOL to Deferred Tax Asset
A net operating loss arises when a company’s deductions exceed its taxable income for the year. NOLs generated in tax years beginning after December 31, 2017, carry forward indefinitely and can no longer be carried back to prior years, aside from narrow exceptions for certain farming losses.1Internal Revenue Service. Instructions for Form 172 Once carried forward, they 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 benefit is recorded as a deferred tax asset. The DTA equals the NOL carryforward multiplied by the expected tax rate; at the federal corporate rate of 21%, a $50 million NOL produces a $10.5 million DTA. But the asset isn’t cash. It only holds value if the company earns enough future taxable income to use it. When the likelihood of that happening drops below 50%, a valuation allowance must bring the DTA down to what management actually expects to realize.
The More Likely Than Not Threshold
ASC 740 poses 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 short.
This isn’t all-or-nothing. Management can conclude that $30 million of a $50 million DTA is realizable and record a partial valuation allowance against the other $20 million. And the analysis runs separately for each tax jurisdiction where the company has deferred tax assets, because using an NOL requires generating income in that same jurisdiction.
The judgment is genuinely hard. Two reasonable accountants can look at identical facts and reach different conclusions, which is why auditors devote significant time to testing whether management’s position is supportable. Most disputes with auditors on this topic land not on the math but on how conflicting evidence gets weighted.
Four Sources of Future Taxable Income
ASC 740 identifies four possible sources of future taxable income that can support realization of a DTA, and they are typically evaluated starting with the most objectively verifiable.3The Tax Adviser. Assessing the Need for a Valuation Allowance
- Reversal of existing taxable temporary differences. When a company has deferred tax liabilities on the books, those DTLs will produce taxable income when they reverse. Matching a DTL reversal against a DTA is the strongest possible evidence because neither side involves a forecast. The timing and character of the reversals still have to align: a DTL reversing in two years doesn’t help absorb an NOL that would need a decade of income to use.
- Taxable income in prior carryback years. If the tax law lets you carry the NOL back to a profitable prior year, the resulting refund is about as certain as evidence gets. For most companies today, this is largely unavailable because post-2017 NOLs cannot be carried back, but it still matters for the narrow carryback exceptions.
- Projected future taxable income. Forecasts of earnings, excluding reversing temporary differences and carryforwards, are inherently subjective and receive significantly less weight than the first two sources. The projections must be consistent with the company’s historical performance and its industry outlook. A money-losing company cannot project its way out of an allowance with an optimistic hockey-stick forecast.
- Tax planning strategies. Specific, feasible actions the company could take to generate or accelerate taxable income — selling an appreciated asset, converting tax-exempt investments to taxable ones. The strategy has to be something management both can and intends to implement, and it must be prudent. Something that would damage the business is not feasible even if it would technically produce tax income.
Weighing Positive and Negative Evidence
Evidence assessment is the core of the exercise. Every available data point gets considered, and each piece is weighted by how objectively verifiable it is. A signed contract guaranteeing future revenue carries more weight than a management forecast. A three-year loss record carries more weight than an analyst’s prediction of recovery.
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,” and practice has converged on the current year plus the prior two — a three-year window — 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 tilts sharply toward a full valuation allowance. Cumulative losses are objectively verifiable, and under ASC 740 objectively verifiable negative evidence can only be offset by objectively verifiable positive evidence, not by management projections. A company in a cumulative loss position that leans on forward-looking earnings estimates to avoid an allowance will have a hard time defending that position to auditors.
Other forms of negative evidence include 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
Positive evidence that can support concluding no allowance is needed includes:
- A strong earnings history, especially powerful when the current loss traces to an identifiable, non-recurring event such as a one-time restructuring charge or litigation settlement rather than ongoing operating weakness.
- Existing contracts or firm sales backlogs. Signed agreements sufficient to absorb the DTA serve as objective evidence, common in defense contracting or long-term infrastructure projects.
- Appreciated asset values. Assets with fair market value significantly above tax basis would generate taxable gain on sale, though the company must actually have the ability and willingness to sell.
The weighting isn’t a checklist. A company can have both a cumulative loss (strong negative evidence) and a large backlog of signed contracts (strong positive evidence). In that case, management would need to show the backlog is sufficient in both amount and timing to overcome the loss history. A vague sense that things are turning around does not pass muster.
Section 382 Ownership Changes
One factor that sharply raises the odds of needing a valuation allowance is a change in corporate ownership under Section 382. 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 is 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 an ownership change could use only about $3.58 million of pre-change NOLs per year, regardless of how profitable it later becomes. Unused portions of the annual limit carry forward, but the restriction can make a large NOL practically useless if the company’s value was low at the change date.
This matters for valuation allowances because a §382 limitation can leave a company holding billions in NOLs on paper while being able to use only a few million per year. The DTA has to 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 face this problem often, and it can trigger a full or near-full valuation allowance even when the company is currently profitable.
State-Level Analysis
The federal indefinite carryforward and 80% limitation are only part of the picture. A separate valuation allowance analysis is required 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 cap carryforwards at 20 years. Another dozen impose shorter windows, some as brief as five years. A handful limit the dollar amount that can be carried forward, and several have periodically suspended NOL deductions during fiscal crises. States imposing gross receipts taxes rather than corporate income taxes offer no NOL deduction at all.
State DTAs are calculated using a blended rate, which is the state rate reduced by the federal benefit of deducting state income taxes. Because state carryforward periods are often shorter than the federal indefinite period, a company can conclude its federal NOL is fully realizable while still needing an allowance for the same underlying loss at the state level. A company operating in 30 states can reach 30 different conclusions.
Recording and Releasing the Allowance
When an allowance is established or increased, the company debits income tax expense and credits the valuation allowance account. No cash moves, but reported net income falls. On the balance sheet, the DTA appears net of the allowance: a $10 million gross DTA with a $6 million allowance shows as a $4 million net DTA.
The income statement effect can be severe. A company recording a large allowance for the first time will report substantially 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 acknowledging that future profitability is uncertain.
Release works in the opposite direction. There’s no bright-line rule requiring a specific number of profitable quarters, but the most common pattern involves the company reaching a three-year cumulative pretax profit, effectively the mirror image of what triggered the allowance. Once the company has exited its cumulative loss position and can point to objective positive evidence like sustained earnings or contracted future income, management can support reducing or eliminating the allowance. The release debits the allowance and credits income tax benefit, which flows through the income statement and boosts reported net income. Large releases can produce extremely low or even negative effective tax rates in the release period.
Disclosure and Regulatory Scrutiny
Companies must disclose the total change in the valuation allowance during each reporting period, along with the evidence considered in reaching the conclusion.3The Tax Adviser. Assessing the Need for a Valuation Allowance Footnote disclosures typically break out NOL carryforwards by jurisdiction, identify when carryforwards expire, and explain the temporary differences behind the DTAs and DTLs.
For public companies, the SEC actively reviews these disclosures and frequently issues comment letters asking for more detail. A common SEC 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 it is releasing an allowance established earlier. The SEC wants a “why now” explanation identifying the specific change in facts or circumstances that justified the change in judgment.6SEC. SEC Response Letter Vague language about improving market conditions or management’s confidence tends to draw follow-up questions.
Auditors focus on the same points: whether projections are consistent with historical performance, whether the weighting of evidence is defensible, and whether the disclosed rationale is complete. Because the analysis requires significant judgment, valuation allowances are frequently identified as a critical audit matter. Companies that underestimate the documentation burden tend to find out during the audit, and by then the options are limited.