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How Section 382 can unexpectedly impact NOL carryforwards

June 9, 2025 / 9 min read

Most businesses understand that Section 382 limits NOL carryforwards in M&A transactions. Few realize that an “ownership change” can occur as stockholders increase their holdings in any given year. Learn more about this potential trap for the unwary.

Congress created Internal Revenue Code (IRC) Section 382 to make it less attractive for buyers to acquire corporations solely for their loss attributes. The code section limits the ability of a post-acquisition business to offset future gains with acquired net operating loss (NOL) carryforwards based on a formula that multiplies the value of the old loss corporation by a rate published by the IRS.

The application of Section 382 NOL carryforward limitations can be relatively straightforward when there’s a planned merger or acquisition where the parties agree to a transfer of greater than 50% of all stock. But the rules also create a type of “incremental” ownership change for transactions involving shareholders that own 5% or more of the business. The IRC deems that an ownership change has occurred if, immediately after any owner shift involving a 5% shareholder, the percentage of the stock owned by one or more 5% shareholders has increased by more than 50% over the lowest percentage of stock held by those shareholders during a three-year testing period. This type of ownership change can occur in some cases without a corporation ever becoming aware of it. The issuance of additional stock, as well as new classes of stock, can result in existing shareholders crossing the 5% threshold even though they don’t own more than 5% of any one class of stock. Crossing these thresholds can cause significant tax challenges that executives can’t address when they don’t realize the limitations have been triggered.

How a creeping ownership change can limit net operating loss carryforwards

It’s hard to imagine that a corporation could have an ownership change and not be aware of it, but it’s important to remember the incremental ownership change in Section 382 noted above includes certain significant changes in stock ownership by any 5% shareholder. Ownership interests at this level might be relatively easy to track in SEC filings of public corporations.

It’s hard to imagine that a corporation could have an ownership change and not be aware of it.

For privately held corporations, the issue is more complex since ownership interests may be held by a variety of individuals and entities. Shares may be held by another corporation or a partnership, and Section 382 rules require that ownership be traced through those entities to track indirect holdings in the company and determine the “ultimate” owner for purposes of determining a 5% shareholder. Thus, the amount of stock held by any one ultimate owner may be more difficult to track. Even those businesses that maintain ownership records can be surprised to learn that Section 382 definitions for ownership and attribution can differ from accounting principles. For example, capital tables maintained by corporations typically reference direct ownership or custodianship only and don’t identify the ultimate indirect owners.

Common practices that can lead to unexpected ownership changes include:

Section 382 rules also contain a variety of wrinkles, and the details of those are beyond the scope of this article. But it’s still helpful to be aware that these topics may arise in a discussion with your advisors, including:

The fluid nature of corporate ownership makes it even more critical that companies effectively monitor ownership transactions and identify ownership changes in a timely manner.

What does Section 382 actually limit?

With all the ways that businesses can find themselves subject to Section 382, it’s important to understand exactly what the statute limits are. Whether it’s the result of an “equity structure shift” like a merger or reorganization, or an “ownership change” involving a 5% shareholder, the rules state that the taxable income of a “new loss corporation” (the term for the post-event business) for any post-change year can’t be reduced by pre-change losses in excess of the section 382 limitation. That limitation is the value of the old loss corporation multiplied by the long-term, tax-exempt rate published by the IRS.

This limitation may be further increased or reduced due to the existence of assets whose fair market value is higher or lower than the corporation’s tax basis in those assets at the time of the ownership change. These net unrealized built-in gains (NUBIGs) or losses (NUBILs) need to be factored into the limitation at the time of an ownership change. While many taxpayers have relied on guidance from the IRS in Notice 2003-65 (as modified by Notice 2018-30) to determine how NUBIGs and NUBILs may impact limitations, the IRS has signaled that it may be releasing regulations in this area. If and when regulations are issued, the long-standing guidance under the notices could be subject to change.

Pre-change losses that are subject to the Section 382 limitations include:

Steps corporations can take to avoid surprise Section 382 limitations

In many cases, privately held corporations that trigger Section 382 limitations on their net operating loss carryforwards and other attributes fail to realize that an ownership change has occurred until they are preparing their reporting. Once a corporation becomes profitable and starts to apply the carryforwards to reduce taxable income, at that point, the IRS often sees the use of the prior year attributes and asks for documentation of ownership, revealing that a change occurred in a previous year where the limitations apply.

Corporations looking to avoid this surprise imposition of the limitations can engage a tax professional to perform an Section 382 ownership study to monitor the owner group for any changes. These studies look for particularities like accumulation of multiple classes of stock and attribution of holdings in multitiered businesses that might not normally come to the attention of the business. Such a study should also become a regular part of the M&A due diligence process, as an acquiring company needs to know upfront if a target is potentially subject to any previously uncovered Section 382 limitations. These errors can be particularly costly because, even though the unnoticed ownership change may have occurred outside the statute of limitations, the impact routinely is felt on the more recent tax return under examination where such losses are utilized.

Corporations looking to avoid this surprise imposition of the limitations can engage a tax professional to perform an Section 382 ownership study.

It’s true Section 382 ownership studies will add to the cost of tax compliance, often during a period when a corporation is operating at a loss. However, the cost of failing to detect ownership changes can be much more significant, especially if discovered by an acquirer during due diligence or by the IRS during an examination when such losses are utilized.

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