You can take a business loss deduction against wages, investment returns, or other income in the same tax year, but only after the loss survives a stack of limitations the IRS applies in a fixed order. For 2026, non-corporate taxpayers face a hard annual ceiling on top of everything else: business losses above $256,000 ($512,000 on a joint return) cannot offset non-business income that year.1IRS.gov. Rev. Proc. 2025-32 – 2026 Inflation Adjustments Blocked amounts don’t disappear. They convert into a net operating loss you carry into future years. The practical question is how much of this year’s loss you can actually use now, and what happens to the rest.
What Counts as a Business Loss
The activity generating the loss has to be a real trade or business. That means continuous, regular activity with a genuine profit motive, not a one-off sale or a serious hobby.2Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses The expenses producing the loss must be ordinary and necessary for your industry, and the IRS allows the full deduction for those expenses even when they exceed the year’s gross income from the business.3eCFR. 26 CFR 1.162-1 – Business Expenses
Sole proprietors report the loss on Schedule C, farmers use Schedule F, and owners of partnerships or S corporations pick up their share through Schedule E or a K-1.4IRS.gov. Instructions for Schedule C – Profit or Loss From Business
One boundary worth naming: if the IRS reclassifies your activity as a hobby, the loss deduction is gone. The presumption of a business kicks in when you show a profit in three of the last five years (two of seven for horse breeding, training, or racing).5IRS.gov. Business or Hobby – Answer Has Implications for Deductions Fail that, and the burden shifts to you to prove profit motive through factors like recordkeeping, expertise, time devoted, and whether you actually depend on the income. Under a hobby classification, you still report the income but cannot deduct the expenses against it, and you certainly cannot use hobby losses to reduce wages or investment income. The One Big Beautiful Bill Act permanently eliminated the miscellaneous itemized deduction that used to soften this outcome.
The Order the Limitations Apply
Assume your activity clears the hobby test. The loss now runs through up to four filters, in this sequence:
- Basis (for partners and S corporation shareholders only)
- At-risk rules
- Passive activity rules
- Excess business loss cap
Order matters. A dollar blocked at an earlier stage never reaches the later tests. It stays frozen at that level, suspended, until conditions change and release it. Only the portion of the loss that survives every applicable stage reduces your other income this year.
Basis Limit for Partners and S Corporation Shareholders
If you own an interest in a partnership or S corporation, your loss deduction is capped at your outside basis in the entity. Basis is essentially a running investment balance: contributions and allocated income raise it, distributions and prior losses lower it.6IRS.gov. Partner’s Outside Basis
A key difference between the two structures trips up S corporation owners regularly. Partners get basis for their share of partnership liabilities, so a partnership loan can support loss deductions. S corporation shareholders get no basis from corporate-level debt unless they personally loaned money to the company. If the company borrowed from a bank, that loan does not give you basis. Losses beyond your basis are suspended and carry forward until you contribute more capital, lend to the entity, or receive additional income allocations.
The At-Risk Limit
Next, the at-risk rules cap your deduction at the amount you could actually lose financially in the venture. That includes cash and property you put in, plus any borrowing you’re personally on the hook for.7Office of the Law Revision Counsel. 26 USC 465 – Deductions Limited to Amount at Risk
Amounts protected by nonrecourse financing, guarantees, or stop-loss arrangements don’t count as at-risk, because someone else bears the downside. Qualified nonrecourse real estate financing is the notable carve-out: a loan from a bank or other qualified lender secured by the real property used in the activity does count.
Your at-risk amount moves with the business. It grows with earnings and new contributions, shrinks with losses and distributions. Losses above the at-risk amount are suspended indefinitely and become deductible in a later year when your at-risk figure rises.
The Passive Activity Limit
Passive activity losses are the filter that stops the most deductions. A passive activity is any trade or business in which you don’t materially participate, and losses from a passive activity can only offset income from other passive activities. They cannot reduce wages, professional fees, interest, or dividends.8Internal Revenue Service. Publication 925 (2025), Passive Activity and At-Risk Rules
How to Show Material Participation
To treat the loss as non-passive and use it against active income, you need to meet one of seven material participation tests in the Treasury Regulations:9eCFR. 26 CFR 1.469-5T – Material Participation (Temporary)
- More than 500 hours in the activity during the year.
- Substantially all of the participation in the activity by anyone, including non-owners.
- More than 100 hours, and no other individual participated more than you did.
- Significant participation across several activities (more than 100 hours in each) totaling over 500 hours combined.
- Material participation in any five of the preceding ten tax years.
- For a personal service activity (health, law, engineering, accounting, consulting, and similar fields), material participation in any three preceding years.
- Regular, continuous, and substantial participation based on facts and circumstances. The IRS reads this one narrowly.
Keep a contemporaneous log of your hours. Reconstructions built after the IRS starts asking questions carry far less weight than a calendar or time record kept as the year unfolds.
Rental Real Estate
Rentals are automatically passive no matter how many hours you spend on them, with two exceptions.8Internal Revenue Service. Publication 925 (2025), Passive Activity and At-Risk Rules
The active participation allowance lets you deduct up to $25,000 in rental losses against non-passive income if you actively participated, a lower standard that generally requires making management decisions like approving tenants and setting rents. The allowance phases out $1 for every $2 of modified adjusted gross income over $100,000 and hits zero at $150,000 MAGI.
The real estate professional exception applies if more than half your total personal services for the year were in real property trades or businesses where you materially participated, and you logged more than 750 hours in those activities. Qualifying strips off the automatic passive label, though you still need to materially participate in each rental (or elect to group them) for the losses to be non-passive.
Getting Suspended Passive Losses Released
Passive losses that get blocked don’t expire. They carry forward and become usable when you have passive income to absorb them, when the same activity turns profitable, or when you dispose of your entire interest in the activity in a fully taxable transaction to an unrelated buyer.10Office of the Law Revision Counsel. 26 USC 469 – Passive Activity Losses and Credits Limited
The full disposition rule is the most powerful release. Every dollar of accumulated suspended loss from that activity is reclassified as non-passive and becomes available against any type of income, including the gain on the sale itself. If the interest transfers at death, suspended losses are only deductible to the extent they exceed the step-up in basis the heir receives. For installment sales, the losses release proportionally as each payment comes in.
The 2026 Excess Business Loss Cap
A loss that survives basis, at-risk, and passive activity screening still faces one more annual limit. The excess business loss rule aggregates income and deductions across every trade or business you’re involved in: Schedule C, Schedule F, and pass-through allocations. If your total net business loss exceeds the year’s threshold, the overage is blocked from offsetting non-business income this year.
For 2026, the threshold is $256,000 for most filers and $512,000 for married couples filing jointly, both indexed annually for inflation.1IRS.gov. Rev. Proc. 2025-32 – 2026 Inflation Adjustments The calculation runs on Form 461.11IRS.gov. Instructions for Form 461 – Limitation on Business Losses
Worked example. Single filer, $400,000 in wages, $350,000 net business loss that has cleared every earlier test. The first $256,000 of the loss offsets wages. The remaining $94,000 is the excess business loss, blocked for the year, and it converts automatically into a net operating loss carryforward for the following tax year.
This cap was scheduled to sunset after 2025. The One Big Beautiful Bill Act made it permanent.11IRS.gov. Instructions for Form 461 – Limitation on Business Losses
What Happens to the Blocked Portion: NOL Carryforward
Whatever the excess business loss cap blocks becomes a net operating loss. So does any loss that flowed through every filter but exceeded your other income for the year. NOLs carry forward indefinitely under current law.12Office of the Law Revision Counsel. 26 USC 172 – Net Operating Loss Deduction
The catch is that in any future year, you can only use an NOL to offset 80% of taxable income (calculated before the NOL deduction). The other 20% remains taxable no matter how large your carryforward balance is. So a big accumulated NOL doesn’t produce years of zero tax; it produces years of reduced tax spread over as long as it takes.
Carrybacks are gone for most businesses. Farming losses keep a two-year carryback, and only the farming portion of an NOL qualifies; non-farming losses in the same year carry forward only.13Internal Revenue Service. Instructions for Form 172 Property and casualty insurance companies retain carryback rights as well.
Track the balance carefully. Each year you need to know the amount coming in, the 80% cap on this year’s use, and the amount remaining.
Loss Years and the QBI Deduction
The Section 199A qualified business income deduction, now permanent, gives eligible pass-through and sole proprietor owners a deduction of up to 20% of qualified business income. A loss year affects the calculation.
If one of your businesses loses money while another earns, the loss reduces the profitable business’s QBI before you compute the 20%. If the combined QBI is negative, you get no deduction that year, and the negative amount carries forward to reduce QBI in future years even if the losing business no longer exists.14IRS.gov. 2025 Instructions for Form 8995-A
Losses suspended by the at-risk, passive activity, or excess business loss rules are excluded from QBI in the year they arise. They enter the QBI calculation only in the year they’re actually allowed on your return, and they keep their character as qualified or non-qualified while suspended, so track them separately.14IRS.gov. 2025 Instructions for Form 8995-A The 2026 phase-in for specified service businesses starts at $201,750 ($403,500 joint).1IRS.gov. Rev. Proc. 2025-32 – 2026 Inflation Adjustments
Social Security Credits in a Loss Year
A loss year also affects your Social Security record. Self-employed people earn credits based on net self-employment earnings. In 2026, one credit costs $1,890 in covered earnings, with a maximum of four credits per year at $7,560 in earnings.15Social Security Administration. Social Security Credits A loss that wipes out your net self-employment income means zero credits that year. Enough loss years and you can fall short of the 40 credits needed for retirement benefits.
The nonfarm optional method lets you report a small amount of self-employment income even in a loss year.16Internal Revenue Service. Topic No. 554, Self-Employment Tax You pay a modest self-employment tax and preserve the credits, and you may also protect eligibility for the earned income credit or the child and dependent care credit. The Schedule SE instructions lay out the eligibility rules. Worth a look if you’re in a long startup phase and won’t turn a profit for a while.