Net operating loss carry-forward rules for 2025

When your allowable deductions exceed your income in a given tax year, the IRS does not simply discard that tax benefit. Instead, you can carry the resulting net operating loss forward and apply it to reduce taxable income in future profitable years. The NOL carry-forward rules for the 2025 tax year follow the framework established by the Tax Cuts and Jobs Act, meaning post-2017 losses carry forward indefinitely but are capped at 80% of taxable income in every year they are applied.

Knowing how to correctly calculate, track, and deploy an NOL carry-forward can produce substantial tax savings across multiple filing seasons. This guide covers who qualifies, how the calculation works, which forms to file, how the One Big Beautiful Bill Act creates new NOL positions in 2025, and the strategies that interact most directly with loss carry-forward balances.

What is a net operating loss carry-forward?

A net operating loss arises when a taxpayer's allowable deductions for the tax year exceed their gross income from all sources. The carry-forward is the unused portion of that loss, preserved and applied against taxable income in one or more future years. Unlike a tax credit, an NOL carry-forward reduces the income subject to tax rather than directly reducing the tax owed, making accurate long-term tracking essential for capturing its full value.

Individuals, sole proprietors, and pass-through entity owners calculate and apply NOLs at the individual level, while C Corporations track them separately on corporate returns. IRS Publication 536 provides the authoritative guidance for calculating net operating losses and applying carry-forward balances, including detailed worksheets for both business and non-business income components.

Key characteristics of post-2017 NOL carry-forwards include:

• Indefinite carry-forward period with no expiration date
• Maximum annual deduction capped at 80% of taxable income in each application year
• No general carryback available for most taxpayers, with limited exceptions for farm losses
• Pre-2018 NOLs retain their original 20-year limit and 100% offset rules
• Separate tracking required for pre-2018 and post-2017 NOL pools

How did the TCJA change NOL carry-forward rules?

Before the Tax Cuts and Jobs Act, taxpayers could carry a net operating loss back two years and forward twenty years, and those losses could offset 100% of taxable income in the year they were applied. The TCJA removed the general two-year carryback and replaced the 20-year limit with an indefinite carry-forward, but introduced the 80% annual cap that prevents a carry-forward from fully eliminating tax liability in any single year.

These rules remain fully in effect for the 2025 tax year. S Corporations pass losses through to shareholders, who apply the NOL rules on their personal returns based on their allocated share of the entity's loss. Partnerships follow a similar structure, with partners receiving their allocated share on Schedule K-1, subject to basis and at-risk limitations before any carry-forward is established at the partner level.

Pre-2018 losses are not subject to the 80% limitation and can offset up to 100% of taxable income, but they must be utilized within the original 20-year window. Pre-2018 losses are applied first when both pools are available. Mixing the two pools without separate tracking can lead to understated income or permanently lost deductions.

How to calculate your NOL for the 2025 tax year

Not every negative figure on a tax return qualifies as a net operating loss. The IRS requires a specific modified calculation that isolates business-related losses from non-business items before confirming that a true NOL exists. Personal deductions and capital losses that exceed capital gains must be added back to prevent non-business items from inflating the carry-forward amount.

Follow these steps to calculate an NOL for the 2025 tax year:

1. Begin with taxable income from Form 1040, line 15 (a negative figure signals a potential NOL)
2. Add back any NOL deduction already applied in the current year
3. Add back the standard deduction of $15,750 for single filers or $31,500 for married filing jointly, as these are non-business deductions
4. Add back non-business capital losses that exceed non-business capital gains
5. Add back non-business deductions that exceed non-business income
6. A negative result after these adjustments is the confirmed net operating loss for 2025

Depreciation and amortization are the most common drivers of an NOL for business owners. Large first-year bonus depreciation elections can push taxable income well below zero, creating a carry-forward that offsets income in future profitable years. The Oil and gas deduction also frequently generates NOL positions, as intangible drilling cost deductions can represent 60 to 80% of a qualifying investment in the year the deduction is incurred.

What is the 80% NOL deduction limitation?

The 80% limitation is the foundational rule for post-2017 NOL carry-forwards. In any year where a carry-forward is applied, the deductible amount cannot exceed 80% of the taxpayer's taxable income for that year, calculated before the NOL deduction itself. The remaining 20% of taxable income is always subject to tax regardless of the size of the available carry-forward balance.

Here is a practical example for the 2025 tax year:

• Taxable income before NOL deduction: $175,000
• Available post-2017 NOL carry-forward: $220,000
• Maximum deductible NOL (80% of $175,000): $140,000
• Remaining taxable income after NOL: $35,000
• Unused carry-forward available for 2026 and beyond: $80,000

The $35,000 in remaining taxable income is still subject to federal income tax in 2025. The $80,000 unused balance carries forward indefinitely and can be applied in 2026 and subsequent years, subject to the same 80% cap each time.

Tax loss harvesting strategies complement NOL planning for investors who also hold portfolio losses. Realized capital losses offset capital gains first before contributing to the broader NOL calculation, so coordinating investment and business tax planning is more valuable than either approach in isolation. A Traditional 401k contribution in a profitable year reduces taxable income before the 80% NOL cap is calculated, lowering both the base subject to tax and the ceiling on how much carry-forward can be used that year.

How to file an NOL carry-forward on your 2025 return

Claiming an NOL carry-forward requires accurate recordkeeping, specific IRS forms, and documentation of how the original loss arose. The IRS can request verification of carry-forward calculations during an audit, making organized records essential for every year a loss is created or applied.

Required documentation and forms include:

• Publication 536 worksheets for calculating the original NOL and tracking remaining balances year over year
• Schedule 1 of Form 1040, where the deduction is reported as a negative income adjustment on line 8a
• IRS Form 1045 for individuals seeking a quick refund in qualifying farm loss carryback situations
• Form 1139 for C Corporations claiming a corporate quick refund under applicable carryback provisions
• Supporting schedules from the original loss year, including all depreciation schedules and business expense records

Home office deductions and Vehicle expenses both feed into the original NOL calculation and must be properly substantiated. A carry-forward built on undocumented expenses creates audit risk in future years when the underlying records cannot be produced. Retain all receipts, mileage logs, and expense documentation for at least seven years after the loss year.

Maintain a written carry-forward schedule that records the year of origin, the original amount, amounts applied in each subsequent year, and the remaining balance. When pre-2018 and post-2017 loss pools both exist, track them separately to prevent errors that could trigger an IRS notice.

What business expenses can create an NOL carry-forward?

Understanding which business activities create NOL positions gives taxpayers control over their carry-forward balances and the timing of future tax benefits. Large deductions from qualifying activities can intentionally produce a loss in a year when higher future income is anticipated, making the carry-forward more valuable when it is eventually applied.

Common business activities that generate NOL positions include:

1. Accelerated and 100% bonus depreciation elections on qualifying property in the year of purchase
2. Startup costs and organizational expenses for new businesses in early operating years
3. Casualty losses from qualifying disaster events that affect business property
4. Domestic research and development expenses for companies conducting qualifying R&D activities

Meals deductions and Travel expenses contribute to the NOL calculation in years where business revenue falls short. These deductions are just as important in a loss year because they determine the exact size of the carry-forward that will offset taxes when the business returns to profitability.

To manage a large carry-forward balance in a high-income year, taxpayers can maximize contributions to a Health savings account or employer-sponsored retirement plan. These deductions reduce taxable income before the 80% NOL cap is calculated, affecting both how much carry-forward is used and how much rolls to the following year.

NOL carry-forwards under the new 2025 tax law

The One Big Beautiful Bill Act created a direct pipeline between the excess business loss limitation and the NOL carry-forward rules that taxpayers filing for the 2025 tax year must understand. Under the OBBBA, the excess business loss limitation is now permanent, capping annual business loss deductions for non-corporate taxpayers at $313,000 for single filers and $626,000 for married filing jointly in 2025. Losses that exceed these thresholds are not forfeited. Instead, they automatically convert into NOL carry-forwards, subject to the 80% annual deduction cap in every future year they are applied.

For a single taxpayer with $450,000 in business losses from an S Corporation in 2025, the conversion works as follows:

• Allowable current-year business loss deduction: $313,000
• Excess business loss converted to NOL carry-forward: $137,000
• Future deductibility: capped at 80% of taxable income in each year applied

High-loss businesses will accumulate NOL carry-forward balances more rapidly under the permanent OBBBA framework. Tracking both the excess business loss limitation and the resulting carry-forward in the same tax year requires coordination that a single worksheet cannot always capture.

The OBBBA also permanently restored 100% bonus depreciation for qualifying property placed in service after the legislation's effective date. Businesses that aggressively claim first-year bonus depreciation should project the resulting NOL carry-forward against expected future income to confirm whether the timing of those elections maximizes long-term savings or simply defers liability without reducing it.

How do state NOL rules differ from federal rules?

Federal NOL carry-forward rules do not automatically apply at the state level. Many states impose shorter carry-forward periods, different percentage limitations, or entirely separate calculation methods that diverge from the TCJA framework. Failing to account for state-level differences can result in understated state tax liability or missed refund opportunities. California has suspended NOL deductions through 2026 for taxpayers with net business income exceeding $1 million. Minnesota limits the deduction to 70% of income, rather than the federal limit of 80%. Connecticut extended its carry-forward period from 20 to 30 years for losses incurred in tax years beginning on or after January 1, 2025. Rhode Island extended its carry-forward period from 5 years to 20 years, beginning in 2025. Montana and New York permit a three-year carryback for state purposes even though no general federal carryback exists.

Business owners filing in multiple states should confirm the NOL rules for each jurisdiction before applying carry-forward balances on state returns. Reviewing applicable State Tax Deadlines ensures that state amended return deadlines for any qualifying carrybacks are not missed. S Corporations with owners residing in multiple states may also face complications with composite returns when differing state conformity rules apply to the same loss allocation from a single entity.

Maximize your NOL strategy with Instead

Managing net operating loss carry-forwards across multiple tax years requires precise recordkeeping, strategic timing, and coordination with deductions and retirement planning. Miscalculating the 80% limitation, misapplying loss pools, or overlooking the OBBBA's excess business loss conversion can result in paying more tax than the law requires.

Instead's comprehensive tax platform helps you track NOL carry-forward balances, model future income scenarios, and coordinate loss deductions with strategies that reduce your overall tax burden. Instead's intelligent system surfaces savings opportunities aligned with your carry-forward position and keeps records audit-ready for every filing season.

Use Instead's tax savings features to discover strategies that complement your NOL planning, and leverage the tax reporting tools to maintain a complete carry-forward schedule across years. Explore the pricing plans designed to support taxpayers at every level.

Frequently asked questions

Q: Who can claim a net operating loss carry-forward on their 2025 tax return?

A: Any taxpayer whose allowable deductions exceed gross income in a prior tax year may have an NOL carry-forward available. This includes sole proprietors, self-employed individuals, S Corporation shareholders, Partnership members, and C Corporations. Pass-through entity owners apply the rules on their personal returns based on their allocated share of the entity's loss.

Q: Does the 80% limitation apply to all NOL carry-forwards?

A: The 80% limitation applies only to NOLs generated in tax years beginning after December 31, 2017. Pre-2018 losses can offset up to 100% of taxable income but are limited to a 20-year carry-forward window. When both pools are available, pre-2018 NOLs are generally applied before post-2017 losses.

Q: Can I carry a net operating loss back to a prior tax year?

A: The general carryback was eliminated for most taxpayers by the Tax Cuts and Jobs Act. However, qualifying farm losses retain a two-year carryback, and certain insurance company losses remain exempt from the elimination. Eligible taxpayers can claim a quick refund using IRS Form 1045 or by filing an amended return for the applicable prior year.

Q: How does the One Big Beautiful Bill Act affect NOL carry-forward balances?

A: The OBBBA permanently caps annual business loss deductions at $313,000 for single filers and $626,000 for married filing jointly in 2025. Losses exceeding these thresholds automatically convert to NOL carry-forwards, subject to the 80% annual deduction cap. Businesses with large recurring losses will accumulate carry-forward balances more quickly under the permanent framework.

Q: How does an NOL carry-forward affect my 2025 taxable income?

A: The NOL carry-forward is reported as a negative income adjustment on Schedule 1 of Form 1040, reducing taxable income. The deductible amount is capped at 80% of taxable income for the year, calculated before the NOL deduction. Any unused balance rolls forward to 2026 and subsequent years with no expiration date.

Q: What records do I need to support a net operating loss carry-forward?

A: Maintain a written carry-forward schedule showing the year of origin, original amount, amounts applied in each year, and the remaining balance. Keep the tax return and all supporting documentation from the original loss year for at least seven years, including expense receipts and depreciation schedules that created the loss. Track pre-2018 and post-2017 loss pools separately to avoid application errors.