A tax attribute is an item on a taxpayer’s record that carries from one year to the next and changes the tax owed in a later period. The most familiar example is a net operating loss: a business that loses money this year can carry that loss forward and use it to reduce taxable income in a future year. Credits, capital losses, disallowed interest, and the tax basis of assets all work the same way. Each is a leftover from a prior year that shapes what a return looks like now.
Tax attributes matter most during corporate mergers, acquisitions, and bankruptcies, where their value can rival a company’s physical assets and where federal rules tightly control how much benefit a new owner can actually capture. But the underlying concept is broader than that, and it applies to individuals too.
The Three Categories of Tax Attributes
Tax attributes fall into three broad groups. The category matters because each follows different rules for transfer, limitation, and expiration.
Loss and deduction carryforwards. Net operating losses, capital losses, and disallowed business interest sit here. They reduce future taxable income directly, and they are the attributes most commonly monetized in corporate deals.
Credit carryforwards. General business credits, foreign tax credits, and minimum tax credits reduce the final tax bill dollar-for-dollar rather than reducing taxable income. That makes each dollar of credit more valuable than a dollar of deduction.
Basis and accounting methods. The tax basis of assets, inventory methods like LIFO or FIFO, and accumulated earnings and profits belong to this category. They don’t directly shrink a tax bill, but they set the framework for calculating future gains, losses, and deductions. A company with high-basis assets recognizes smaller gains when it sells them.
Common Examples and How They Work
Net Operating Losses
The net operating loss is the attribute that drives the most deal value and the most IRS scrutiny. An NOL arises when a taxpayer’s deductions exceed its gross income for a year. Under the Tax Cuts and Jobs Act, NOLs generated in tax years beginning after December 31, 2017, carry forward indefinitely, with no expiration date.1Office of the Law Revision Counsel. 26 U.S. Code 172 – Net Operating Loss Deduction Corporate NOLs generated before that change expired after 20 years.
The tradeoff for indefinite carryforward is a ceiling on annual use. For tax years beginning after 2020, post-2017 NOLs can offset only 80% of taxable income in a given year.2Internal Revenue Service. Instructions for Form 172 – Net Operating Losses That guarantees the government collects some tax each year no matter how large the accumulated losses. Pre-2018 NOLs still being carried forward are not subject to the 80% cap and can offset 100% of taxable income. Corporations claim the deduction on line 29a of Form 1120.3Internal Revenue Service. Form 1120 – U.S. Corporation Income Tax Return
Capital Loss Carryovers
When capital losses exceed capital gains for the year, the excess becomes a carryover. Capital losses can only offset capital gains, not ordinary income, which makes them less flexible than NOLs. Corporations carry unused capital losses forward for five years. Individuals carry theirs forward indefinitely, rolling the excess into the next year as either a short-term or long-term loss depending on its character.4Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers The five-year corporate window means these losses expire far more quickly than NOLs.
Disallowed Business Interest
Businesses cannot deduct unlimited interest expense. Under Section 163(j), the deduction for business interest in any year is capped at the sum of the taxpayer’s business interest income plus 30% of adjusted taxable income. Interest that exceeds the cap is not lost. It carries forward to the next year and is treated as if paid in that year.5Office of the Law Revision Counsel. 26 USC 163 – Interest For highly leveraged companies, these carryforwards can accumulate into a significant attribute.
Tax Basis
Tax basis is the taxpayer’s investment in a piece of property for tax purposes. It determines two things: how much gain or loss you recognize when you sell the asset, and how much depreciation you can claim while you hold it. A higher basis means larger annual depreciation deductions and a smaller gain on sale. Basis is not a carryforward in the same sense as an NOL, but it functions as a tax attribute because it directly shapes the computation of taxable income in future years.
What Happens to Tax Attributes in a Corporate Acquisition
Whether a buyer inherits a target’s tax attributes depends on how the deal is structured. In a taxable asset purchase, the buyer acquires the company’s assets, gets a new stepped-up basis reflecting the purchase price, and leaves the seller’s NOLs and credits behind with the selling entity. In a stock purchase, the target corporation continues to exist, so its attributes remain inside it. In tax-free reorganizations and certain subsidiary liquidations, Section 381 requires the acquiring corporation to succeed to the target’s attributes and take them into account going forward.6Office of the Law Revision Counsel. 26 U.S. Code 381 – Carryovers in Certain Corporate Acquisitions
Transfer, however, does not mean unrestricted use. That is where Section 382 comes in.
The Section 382 Limitation
An ownership change triggers an annual cap on how quickly a new owner can use the target’s pre-change losses. This is the rule that prevents companies from being acquired solely for their tax losses. An ownership change occurs when the aggregate stock ownership of one or more 5-percent shareholders increases by more than 50 percentage points compared to the lowest ownership percentage those shareholders held at any point during the prior three-year testing period.7Office of the Law Revision Counsel. 26 USC 382 – Limitation on Net Operating Loss Carryforwards and Certain Built-In Losses Following Ownership Change The trigger is broader than it sounds. It catches not just outright acquisitions but also new equity issuances, redemptions, and sequences of smaller transactions that cumulatively cross the threshold.
Once an ownership change is confirmed, annual use of pre-change losses is capped at the fair market value of the loss corporation’s stock immediately before the change, multiplied by the IRS-published long-term tax-exempt rate. As of early 2026, that rate is 3.58%.8Internal Revenue Service. Rev. Rul. 2026-6 A company valued at $100 million immediately before the change would face an annual cap of roughly $3.58 million in pre-change loss utilization. Unused portions of the cap accumulate and roll forward.
There is one scenario where the limitation drops to zero. If the new loss corporation does not continue the business enterprise of the old loss corporation at all times during the two-year period following the ownership change, the annual limitation becomes zero.7Office of the Law Revision Counsel. 26 USC 382 – Limitation on Net Operating Loss Carryforwards and Certain Built-In Losses Following Ownership Change A buyer cannot acquire a loss corporation, shut down its operations, and use the losses to shelter income from a completely different business.
Section 383 extends the same ownership-change limitation to excess credits and capital loss carryforwards, and the two categories share the same annual bandwidth: once pre-change NOLs consume the Section 382 limitation for a year, there is no room left for credits.9Office of the Law Revision Counsel. 26 USC 383 – Special Limitations on Certain Excess Credits
How Tax Attributes Are Reduced After a Debt Discharge
Attributes also come under pressure outside the acquisition context. When a company discharges debt in bankruptcy or while insolvent, the forgiven amount is excluded from taxable income, but the taxpayer pays for that exclusion by reducing its tax attributes.10Office of the Law Revision Counsel. 26 USC 108 – Income From Discharge of Indebtedness The reduction happens in a fixed statutory order:
- Net operating losses for the discharge year, then NOL carryovers
- General business credit carryovers
- Minimum tax credits
- Capital loss carryovers
- The basis of the taxpayer’s property
- Passive activity loss and credit carryovers
- Foreign tax credit carryovers
Each attribute is reduced dollar-for-dollar (or, for credits, 33⅓ cents per dollar of excluded income) until fully exhausted before the next attribute in line is touched. A taxpayer can elect to skip straight to reducing the basis of depreciable property before working through the standard sequence, which sometimes helps preserve NOLs at the cost of lower future depreciation deductions. The election and the overall reduction are reported on Form 982.11Internal Revenue Service. About Form 982, Reduction of Tax Attributes Due to Discharge of Indebtedness
For companies emerging from bankruptcy, Section 108 and Section 382 can stack. A reorganization in bankruptcy often triggers an ownership change that caps future use of whatever NOLs survive the attribute reduction. Sequencing of the effective dates for debt discharge and equity issuance can determine whether the company keeps meaningful attributes or exits with almost none.
Individuals Have Tax Attributes Too
The most complex rules apply to corporations, but individuals carry tax attributes as well. Capital loss carryovers, passive activity losses suspended until the taxpayer generates passive income or fully disposes of the activity, and unused charitable contribution carryforwards all function as attributes for individual filers. The dollar stakes are smaller, but the mechanics are the same: a past economic event creates a benefit that reduces tax in a future year, subject to limits on when and how much you can use.
Across both settings, the core idea holds. A tax attribute represents real economic value, but that value is never guaranteed. Ownership changes, debt discharges, expirations, and structural missteps in a transaction can all erode or wipe out the benefit. The rules are built so tax losses follow real economic activity rather than trading as standalone commodities.