Summary
A tax loss carryforward (also called a carryover) lets individuals and businesses use a tax-year loss to reduce taxable income in future years. For net operating losses (NOLs) the federal rules permit indefinite carryforwards (subject to limits); capital loss carryforwards follow different rules for corporations and individuals. This article explains the concepts, shows examples, summarizes important rule changes, and provides practical, step‑by‑step guidance for applying and tracking carryforwards.
Key concepts at a glance
– Net Operating Loss (NOL) carryforwards: An NOL from one year can offset taxable income in future years. Generally, for NOLs arising in tax years after Dec. 31, 2017, the deduction carried forward is limited to 80% of taxable income in a later year; carryforwards are indefinite. (There were temporary CARES Act exceptions for losses arising in 2018–2020.) [IRS Pub. 536]
– Capital loss carryforwards (corporations): Corporate capital losses can be used only to offset capital gains and may be carried back and forward under statutory schedules (historically a 3‑year carryback then a 5‑year carryforward). [IRS Pub. 542]
– Capital loss carryforwards (individuals): Individuals with net capital losses may offset ordinary income up to $3,000 per year ($1,500 if married filing separately). Any excess loss is carried forward indefinitely until used. [IRS Pub. 550]
– Cost basis matters: Gains and losses are measured relative to an asset’s tax basis (generally purchase price plus fees and reinvested dividends; inherited assets receive a stepped‑up basis). Accurate basis records are essential. [IRS Pub. 551; FINRA]
Why carryforwards exist
Carryforwards smooth taxable income over time and mitigate the tax burden variability caused by investment losses or a down year in business. They let you use past losses to reduce tax in future profitable years instead of letting losses be wasted.
Key federal rule changes worth noting
– Tax Cuts and Jobs Act (TCJA, 2017): eliminated most carrybacks, allowed indefinite carryforwards, and limited NOL deductions to 80% of taxable income for NOLs arising after 2017. [TCJA / IRS Pub. 536]
– CARES Act (2020): temporarily allowed certain NOLs from 2018–2020 to be carried back up to five years and temporarily removed the 80% limit for those years. Those temporary rules have mostly expired; current practice generally follows TCJA limits except where specific transitional rules apply. Always confirm current-year guidance. [IRS guidance]
How NOL carryforwards work (high level)
1. Determine the NOL in the loss year: start with taxable income (or loss) and apply statutory adjustments per IRS Publication 536.
2. In a future profitable year, apply the carryforward to reduce taxable income. For most post‑2017 NOLs, you can reduce taxable income only up to 80% of the taxable income computed without the NOL deduction (special rules and exceptions may apply).
3. Carry the unused portion forward indefinitely until used (subject to the 80% restriction each year). [IRS Pub. 536]
Example — NOL carryforward with 80% limit
– Year 1: Company loses $5,000,000 (NOL).
– Year 2: Company earns $6,000,000 taxable income.
– Under the 80% rule, only $4,800,000 (80% of $6,000,000) of the NOL can be used in Year 2, reducing taxable income to $1,200,000. The remaining $200,000 of the NOL carries forward to future years.
How capital loss carryforwards work
– Corporations: capital losses offset capital gains. Corporations generally apply net capital losses first to prior years (carrybacks) according to the statutory order (e.g., 3 years back) and then forward (e.g., 5 years forward). Check the current rules and any temporary changes in the relevant tax year. [IRS Pub. 542]
– Individuals: net capital losses (after offsetting gains) can reduce ordinary income by up to $3,000 per year ($1,500 if married filing separately). Excess losses carry forward indefinitely and can be used in future years subject to the same $3,000 yearly limit. Example: $10,000 net capital loss with $2,000 capital gains → net loss $8,000; taxpayer may deduct $3,000 this year and carry forward $5,000. [IRS Pub. 550]
Cost basis basics (why it matters)
– Cost basis is typically the amount you paid for an asset plus transaction fees and reinvested dividends; for inherited assets the basis is usually the fair market value at the date of death (stepped‑up basis). Accurate basis determines the gain or loss when you sell. Keep records of purchase dates, costs, fees, and reinvestments. [IRS Pub. 551; FINRA]
Tax‑loss harvesting (investor strategy)
– What it is: Selling investments at a loss to realize capital losses that can offset gains and up to $3,000 of ordinary income for individuals.
– Important constraint: Wash sale rule — you cannot buy a “substantially identical” security within 30 days before or after the sale and still claim the loss; otherwise the loss is disallowed and deferred by adjusting the basis of the replacement shares. [IRS Pub. 550]
– Practical use: Harvest losses toward the end of the calendar year to offset realized gains. Consider transaction costs, portfolio drift, and whether the replacement security maintains the intended asset exposure.
Can states differ?
Yes. State tax law often follows federal rules but with important differences (different caps, carryforward periods, or disallowances). Always check the rules for each state where you file. [Tax Foundation]
Practical steps — Businesses (NOLs)
1. Maintain clean tax and accounting records that reconcile book income to taxable income.
2. At year‑end, compute taxable income per tax code and determine if an NOL exists (follow IRS Pub. 536 for required adjustments).
3. Track the origin year and amount of each NOL and document how you calculated it.
4. When profitable, apply carryforwards in the required order and under the applicable limitation (e.g., 80% rule for most post‑2017 NOLs).
5. File required returns and if practical, consider tax planning to optimize carryback (if applicable) or carryforward usage (e.g., timing of income, deductions, credits).
6. Monitor state rules and prepare state‑by‑state computations if necessary.
7. Keep NOL schedules permanently and ensure tax return positions are supported (audits often focus on NOLs). [IRS Pub. 536; Journal of Accountancy]
Practical steps — Individuals and investors (capital losses and cost basis)
1. Keep detailed cost basis records for every security (purchase date, purchase price, reinvested dividends, commissions).
2. When selling, calculate the gain/loss using the correct basis method (FIFO, specific identification, etc.). Track short‑term vs. long‑term status (holding period affects rates).
3. Harvest losses deliberately: identify positions to sell that realize losses that offset gains, mindful of portfolio exposure and rebalancing needs.
4. Respect the wash sale rule: if you want to maintain exposure, buy a substantially similar but not “substantially identical” security (e.g., different ETF tracking same asset class) or wait 31+ days.
5. Apply up to $3,000 of net capital loss against ordinary income per year; carry the remainder forward indefinitely.
6. Report carryforwards accurately on Schedule D (or state forms) and retain worksheets showing how carryforwards were calculated. [IRS Pub. 550; FINRA]
Recordkeeping and reporting tips
– Keep purchase confirmations, brokerage statements, trade confirmations, and dividend reinvestment records.
– Keep tax returns and supporting worksheets that show the NOL computation and carryforward schedule.
– Use tax software or spreadsheet schedules to track the balance of carryforwards year to year.
– Consult a CPA or tax attorney when carryforwards are large or when combined with other complex tax items (e.g., pass‑through entity losses, AMT implications, business restructuring, M&A).
Common pitfalls and audit triggers
– Poor documentation of basis or the NOL calculations.
– Violating wash sale rules and failing to properly adjust basis.
– Misapplying state rules that differ from federal law.
– Applying carryforwards in the incorrect order (for corporate capital loss carrybacks/carryforwards).
– Not accounting for special rules (e.g., capital losses treatment for partnerships/S‑corporations, or limitations imposed by ownership changes).
Frequently asked questions (brief)
– How long can I carry an NOL forward? For most NOLs that arise after Dec. 31, 2017, carryforwards are indefinite (subject to the 80% taxable income limit). [IRS Pub. 536]
– How much of my taxable income can an NOL offset? Generally up to 80% of taxable income for NOLs arising after 2017, with transitional exceptions. Confirm current rules for your tax year. [IRS Pub. 536]
– Can I carry capital losses back? Corporations historically can carry net capital losses back three years and forward five years (check current law for your tax year). Individuals cannot carry capital losses back but can carry forward indefinitely. [IRS Pub. 542; IRS Pub. 550]
Bottom line
Losses carry value beyond the year they occur: NOL and capital loss carryforwards allow taxpayers to offset future taxable income and gains. The rules are detail‑heavy and have changed in recent years, so careful calculation, consistent recordkeeping, and periodic review with a tax professional are essential to realize the full benefit and avoid pitfalls.
Sources and further reading
– Internal Revenue Service, Publication 536, “Net Operating Losses (NOLs) for Individuals, Estates, and Trusts.” (current edition)
– Internal Revenue Service, Publication 542, “Corporations.”
– Internal Revenue Service, Publication 550, “Investment Income and Expenses.”
– Internal Revenue Service, Publication 551, “Basis of Assets.”
– FINRA, “Cost Basis Basics—Here’s What You Need to Know.”
– Journal of Accountancy, “Carry Your Losses (Further) Forward.”
– Tax Foundation, “Net Operating Loss Carryforward.”
– Investopedia, “Tax Loss Carryforward” (summary and examples)
Editor’s note: The following topics are reserved for upcoming updates and will be expanded with detailed examples and datasets.