Section 461(l): the 2026 excess business loss limit

By Max Medvedev · 6 Aug 2026

The cap that sits after everything else

For 2026, section 461(l) limits the business loss a noncorporate taxpayer can deduct against other income to $256,000 single and $512,000 married filing jointly (Rev. Proc. 2025-32). A first-year cost-seg loss larger than that does not all land this year. The excess is not lost — it becomes a net operating loss carried forward under §172.

Four gates, and this one is last

A large paper loss has to survive four limits, in this order, before it reduces a W-2:

1. Basis — nothing is deductible beyond what you have in the property.
2. At-risk, §465 — qualified nonrecourse real-estate financing counts as at-risk under §465(b)(6), so an ordinary bank mortgage usually clears. Seller paper and related-party debt may not.
3. Passive, §469 — the average-stay test and material participation. This is where most losses actually die.
4. Excess business loss, §461(l) — the cap below.

The order matters because §461(l) never sees a passive loss. It applies to a loss that is already non-passive: you cleared the seven-day line under Reg. §1.469-1T(e)(3)(ii)(A), you materially participated under Reg. §1.469-5T(a), and only then does the size of the deduction come up. Passing the seven-day test alone leaves the loss passive, and a passive loss is suspended long before this cap is reached.

Gate 4 is reported on Form 461. A qualifying short-term rental skips Form 8582 entirely — it is not a rental activity — but Forms 6198 and 461 still apply.

The 2026 figures, and the drop nobody expected

The cap went down. That is not a typo and not a rounding artifact. OBBBA made §461(l) permanent and rebased its inflation index to a 2024 base, erasing the compounding that had built up since 2017. The threshold restarted lower and indexes from there.

The practical effect is a planning trap with a specific price. A joint filer who models a 2026 purchase against last year's $626,000 is working with a cap $114,000 too high, and the difference is not a rounding error in a projection — it is the line between cash this April and a carryforward. Expect roughly flat-to-rising figures from here, off the lower base.

The cap is computed across the aggregate of your trades and businesses, not property by property. A profitable business elsewhere on the return absorbs part of the rental loss before the cap is tested.

A $700,000 loss, both filing statuses

Take a cost segregation study on a $2M short-term rental that produces a $700,000 first-year loss — non-passive, past the first three gates:

A single filer with the same property and the same study deducts about a third of the loss this year. Tools that show the entire loss hitting immediately are wrong, and the error is largest for exactly the buyer who bought the biggest property.

What happens to the excess

The disallowed amount becomes a net operating loss carryforward under §172. Three features decide what it is worth:

• Carried forward indefinitely. It does not expire.
• No carryback. It cannot be pushed into a prior year to generate a refund now.
• Capped at 80% of taxable income in the year it is used. That is the part people miss: an NOL cannot zero out a later year. At $200,000 of taxable income, at most $160,000 of carryforward is usable, and $40,000 stays taxed.

So the deduction survives, but it arrives later, in slices, at whatever marginal rate that later year happens to carry. Deferral is not denial, and it is not the same as cash this year either.

The levers that exist before the return is filed

Once the loss is computed, the cap is arithmetic. The choices are made earlier:

• Elect out of bonus by class under §168(k)(7). If 100% bonus pushes the loss far past the cap, taking the 5-year class over its normal life may deduct more, sooner, in total — and it protects a positive QBI base instead of stranding it.
• Time the placed-in-service date. A December closing and a January one land in different years against different caps.
• Phase the study, or model it against a second property in a later year rather than stacking everything into one return.
• Model the exit alongside it. The §1245 personal property recaptures at ordinary rates up to 37% at sale. A deduction deferred into a low-rate year and recaptured in a high-rate one is a worse trade than the headline number suggests.

Every one of these is a comparison between two computed years. None of them is a rule of thumb.

Where the cap fits in the whole picture

Section 461(l) decides how much of the loss lands, never whether the loss exists. That question belongs to the passive rules, and it is answered by the average-stay math and the hours log. The depreciation guide walks the deduction from the 39-year fork through the study to recapture at sale; this cap is the last thing standing between it and your wages.

Run your purchase, filing status, and reservation mix through the estimator — it applies basis, at-risk, passive, and the §461(l) cap in order, shows what carries forward, and cites the rule behind every figure.