Tax Attribute

A tax attribute is a specific feature of your tax situation that can reduce how much you owe, either now or in a future year. Net operating losses, capital loss carryovers, tax credit carryforwards, and adjusted asset basis all count as tax attributes under the Internal Revenue Code. You earn them in one tax year and apply them in another, subject to strict IRS rules.

Think of a tax attribute like a stored coupon with an expiration date and spending restrictions.

The Main Types of Tax Attributes

Each type follows its own IRS rules. Misunderstanding these distinctions leads to assuming a carryover will be available when it may already be limited or expired.

• Net Operating Loss (NOL): When deductions exceed gross income, the excess becomes an NOL. Under the Tax Cuts and Jobs Act of 2017, NOLs carry forward indefinitely but can offset only 80% of taxable income in any given future year.
• Capital Loss Carryover: Capital losses exceeding capital gains can offset up to $3,000 of ordinary income per year. Any remaining unused amount carries forward indefinitely. You track this annually on Schedule D of Form 1040.
• Tax Credit Carryforwards: Credits like the foreign tax credit carry forward when they exceed your current-year tax. The foreign tax credit carries forward 10 years and back 1 year, tracked separately by income basket.
• Adjusted Basis: Basis is what you paid for an asset, adjusted upward for improvements and downward for depreciation taken. It determines your gain or loss on sale and travels with the asset for its entire holding period.
• Passive Activity Loss Carryovers: Losses from passive activities that exceed passive income carry forward until you generate passive income or fully dispose of the activity. IRS Form 8582 tracks these each year.

Section 382 and Corporate Ownership Changes

Tax attributes become critical in acquisitions. Section 382 limits the use of a target company's NOL carryforward after an ownership change exceeding 50% within three years.

The Section 382 annual limit equals the fair market value of the acquired company multiplied by the long-term tax-exempt rate the IRS publishes monthly. A company with $50 million in NOLs but a $2 million annual Section 382 limit faces a 25-year drawdown period to use those losses. Discounted to present value, those NOLs are worth far less than their face amount.

How Bankruptcy Reduces Tax Attributes

When a company cancels debt through bankruptcy and excludes that amount from income, the excluded amount must reduce existing tax attributes in a fixed order under Section 108(b).

The reduction happens in this sequence:

1. Net operating losses
2. General business credit carryovers
3. Minimum tax credit
4. Capital loss carryovers
5. Basis in assets
6. Passive activity loss and credit carryovers
7. Foreign tax credit carryovers

Your most flexible attributes go first. A poorly structured reorganization can wipe out years of accumulated tax value before a company recovers financially.

AMT Requires a Separate Track

Some tax attributes require parallel calculations under the Alternative Minimum Tax. Capital loss carryovers can differ for AMT purposes if the asset that generated the loss had a different AMT basis. You need two separate carryover schedules. IRS Form 6251 reconciles the two at filing time.

Using Tax Attributes Strategically

The value of a tax attribute comes from timing. Accumulating carryovers without a plan to use them at full value is a missed opportunity.

• Accelerate income into years where NOL carryovers can absorb it before the 80% cap applies
• Harvest capital losses before December 31 to offset realized gains and build future carryover balances
• Track foreign tax credits by income basket; credits earned in one basket cannot offset tax in another
• Document every asset's basis at acquisition, especially gifted or inherited property subject to carryover basis rules

Tax Attributes in M&A Deals

Buyers in mergers and acquisitions treat target company tax attributes as assets with quantifiable economic value. Before closing, buyers run tax due diligence to identify NOLs, credit carryforwards, and basis positions. They then model the Section 382 limitation to determine what can actually be used each post-acquisition year.

Valuing NOLs accurately requires projecting the combined entity's future taxable income, applying the Section 382 annual cap, and discounting the resulting tax savings to present value. The discount often cuts the stated NOL value by 40% to 70% depending on the acquirer's income trajectory and applicable interest rate.

What Records You Must Keep

The IRS requires documentation for the origin of every tax attribute you claim. For capital loss carryovers, keep purchase dates, cost basis, and sale proceeds for every transaction that produced the loss. For NOL carryforwards, retain copies of all prior-year returns where the losses arose.

The standard statute of limitations is three years. However, when a carryover from a prior year affects a current-year return, the IRS may argue that the limitations period does not start until the year you actually use the attribute. Keep records for as long as any carryover remains open.

Sources

• https://www.irs.gov/irb/2025-44_IRB
• https://www.irs.gov/irb/2025-45_IRB
• https://www.irs.gov/instructions/i6251
• https://www.irs.gov/pub/irs-pdf/i8582.pdf
• https://1040abroad.com/blog/capital-loss-carryover-definition-rules-and-example/
• https://www.taxesforexpats.com/articles/tax-saving-strategies/foreign-tax-credit-carryover.html