Real Estate Tax Calc
What changed
The One Big Beautiful Bill Act (OBBBA), signed July 4, 2025, made the Section 461(l) excess business loss limitation permanent and also changed how the threshold is indexed for inflation. Under the prior law the limit was adjusted upward each year using recent Consumer Price Index data; the OBBBA reset the inflation-adjustment base to its 2017 level. The result: IRS Revenue Procedure 2025-32 (published October 2025) set the 2026 threshold at $256,000 for single filers and $512,000 for married filing jointly.
This is a significant step down from 2025. The 2025 threshold was $313,000 single / $626,000 joint, figures confirmed in the 2025 Form 461 instructions at IRS.gov/instructions/i461. The 2026 draft Form 461 instructions, available at IRS.gov/pub/irs-dft/i461--dft.pdf, confirm the lower $256,000 figure, citing Rev. Proc. 2025-32 § 4.31. The roughly 18% drop in the threshold means more rental and business losses will be capped and deferred for tax year 2026 compared with 2025.
Under Section 461(l), the excess is not lost — it becomes a net operating loss (NOL) carryforward for subsequent years, usable at 80% of taxable income in the carryforward year.
Why it matters to investors
The excess business loss limit sits at the end of a three-step ordering rule. Losses from rental real estate must first clear the passive activity loss (PAL) rules under IRC § 469, then the at-risk rules, and only then does Section 461(l) apply. This means the lower 2026 threshold primarily affects investors who have already passed those earlier tests — that is, investors who can actually use their rental losses against ordinary income.
Two groups face the most direct impact. First, Real Estate Professionals (REPS) who meet the 750-hour and more-than-half-of-personal-services tests: their rental losses are treated as non-passive, so large bonus depreciation or cost segregation deductions flow directly into the Section 461(l) analysis. Second, investors with short-term rental properties (average guest stay of seven days or fewer) where the owner materially participates: those activities fall outside the passive rules entirely and land straight in the excess-business-loss calculation.
A worked example illustrates the impact of the reset. Suppose a REPS taxpayer has $320,000 of first-year losses driven by a cost segregation study and 100% bonus depreciation on a property placed in service in 2026, against $50,000 of other business income. Net business loss is $270,000. In 2025, that would have been within the $313,000 single-filer threshold and fully deductible. In 2026, only $256,000 of the net business loss is allowed as a current deduction; the remaining $14,000 becomes an NOL carryforward. While $14,000 is relatively modest in this example, a heavier cost segregation or a year with multiple acquisitions can push the excess higher, and the lower threshold means investors hit the cap sooner.
The 100% bonus depreciation restored by the OBBBA (discussed in IRS Notice 2026-11) and the $2.5 million Section 179 expensing limit can easily generate paper losses large enough to test the threshold for active investors, making the $256,000/$512,000 figures a meaningful year-end planning number for anyone using accelerated depreciation strategies.
What to do
If you are a real estate professional or a materially participating short-term rental owner, model your total 2026 net business losses across all trades and businesses — not just real estate — before December 31. Any loss above $256,000 (single) or $512,000 (joint) will carry forward as an NOL, which is deductible at up to 80% of taxable income in a future year. That is useful, but it is a deferral, not a permanent deduction.
Because the passive activity loss rules apply before Section 461(l), passive investors who cannot use rental losses against ordinary income will not be affected by the threshold change — their losses are already blocked earlier in the ordering. If you are in this group, the year-end priority is tracking cumulative suspended passive losses so they release correctly when you sell.
For active investors approaching the threshold, a few tools can help. Timing when a cost segregation study is completed and assets are placed in service can shift deductions between years. The election under Section 168(k)(7) to opt out of bonus depreciation for a specific asset class — on a class-by-class basis — lets you smooth large deductions across years rather than taking the full amount in one year that would otherwise exceed the cap. Discuss both options with a tax professional before year-end.
Educational context only. Confirm figures against your specific return with a qualified tax professional. Source: IRS draft 2026 Form 461 instructions and Rev. Proc. 2025-32 § 4.31; summary analysis at Current Federal Tax Developments.
How Form 461 computes the excess
The mechanics live on Form 461, Limitation on Business Losses, which a noncorporate taxpayer attaches to the return in any year of large business losses. The form aggregates all of your trade or business income and gain, subtracts all of your trade or business deductions and losses, and compares the net figure to the threshold. If your aggregate net business loss exceeds $256,000 (single) or $512,000 (joint) for 2026, the portion above the threshold is disallowed for the current year.
On the return, that disallowed amount is reported as a positive number — effectively added back to income on Schedule 1 of Form 1040 — and then carried into the following year as a net operating loss. The threshold is applied after combining every business you own, so profit from a separate operating business can absorb part of a rental loss before the limitation ever bites. One Form 461 covers the whole household: on a joint return, both spouses' businesses are netted together against the single $512,000 figure.
What counts as business income — and what doesn't
A critical and often-missed detail is what the computation treats as business income. Since a 2020 technical correction (the CARES Act added § 461(l)(3)(B)), W-2 wages are not treated as income from a trade or business for this calculation. That matters because it means your salary cannot be used to soak up business losses inside the Form 461 math — the threshold, not your paycheck, is the real ceiling on how much net business loss can offset nonbusiness income such as wages, interest, dividends, and portfolio capital gains.
Business capital gains and losses enter the computation only in a limited way: net capital gain attributable to a trade or business is counted as business income, but generally only up to the amount of your overall net capital gain for the year. These guardrails keep taxpayers from engineering around the limit by reclassifying nonbusiness items as business income to lift the cap.
A joint-filer worked example
A married couple files jointly for 2026. One spouse qualifies as a real estate professional, and a cost segregation study plus 100% bonus depreciation on a newly placed-in-service property produces $700,000 of first-year rental loss. The couple also reports $120,000 of net income from an unrelated consulting business. Their aggregate net business loss is therefore $580,000.
Against the 2026 joint threshold of $512,000, the allowed current-year business loss is capped at $512,000; the remaining $68,000 is disallowed for 2026 and becomes a net operating loss carried into 2027, where it can offset up to 80% of taxable income. The couple still captured an enormous current deduction — but $68,000 of it slipped into a later year. That timing matters if 2027 income is lower (the carryforward is then used in a lower bracket) or if they had earmarked the full 2026 offset against a specific income spike.
A deferral, not a disallowance
It is worth repeating because it changes the planning calculus: an excess business loss is not permanently lost. It converts into a net operating loss that carries forward indefinitely under current law, deductible against up to 80% of taxable income in each future year, with no carryback for most taxpayers. The real cost is therefore the time value of money — you wait a year or more to use a deduction you expected now — plus the risk that the carryforward lands in a lower-bracket year and shelters income that would have been taxed more lightly anyway. For an investor whose income is climbing, the deferral may cost little; for someone whose big-loss year coincided with peak income they specifically wanted to shelter, it can sting.
How it interacts with the QBI deduction and passive losses
Two interactions catch investors off guard. First, the qualified business income (QBI) deduction under § 199A is computed on business income after these loss rules apply; a large current-year business loss reduces or eliminates QBI and can create a negative QBI carryforward that suppresses the deduction in later years. Second, remember the ordering established above: the passive activity loss rules (§ 469) and the at-risk limits (§ 465) apply first, so only losses that have already cleared those gates ever reach Form 461.
This ordering is why the headline threshold reset affects a narrower group than it first appears. An investor who is not a real estate professional and does not meet the seven-day short-term-rental exception will usually have rental losses suspended as passive long before the excess-business-loss threshold is even tested — those losses release later, when the activity is sold or when passive income appears, not through Form 461.
State conformity is uneven
Not every state follows § 461(l). Some states fully conform to the federal limitation, some decouple from it entirely, and others conform with modifications or as of a static date that predates the OBBBA changes. In a nonconforming state you might deduct the full business loss for state purposes even though the federal return defers part of it — or the reverse. Because the limitation feeds into each state's own net-operating-loss regime, the federal and state figures on a loss-year return frequently diverge. Confirm your state's conformity before assuming the $256,000 / $512,000 federal caps apply to your state liability.
Common mistakes with the limitation
Several errors recur with this rule. (1) Testing only the real estate — the limitation aggregates every trade or business, so a profitable side business raises your allowed loss while a second loss-making venture lowers it. (2) Forgetting a spouse's businesses on a joint return, which are combined into one calculation. (3) Assuming married filing separately helps — each MFS spouse gets the single-filer $256,000 amount, not half of the joint figure, so splitting returns does not expand the combined cap and usually costs other benefits. (4) Treating the disallowed loss as gone rather than tracking it as an NOL carryforward on every future return. (5) Taking 100% bonus depreciation reflexively when a § 168(k)(7) election to opt out for a class of assets would keep the loss under the threshold and preserve a full current-year deduction.
Frequently asked questions
What is the 2026 excess business loss limit for a single filer?
Revenue Procedure 2025-32 sets the Section 461(l) threshold for 2026 at $256,000 for single filers and $512,000 for married filing jointly. Net business losses above those amounts are not currently deductible; the excess becomes a net operating loss carryforward.
Does the excess business loss limit affect passive rental investors?
Generally no. The limit applies only after the passive activity loss rules. If your rental losses are already blocked by the passive rules — meaning you are not a real estate professional and do not qualify for the short-term rental exception — Section 461(l) does not come into play because those losses are suspended earlier in the ordering. The threshold primarily affects real estate professionals and materially participating short-term rental owners who can already use rental losses against ordinary income.
Is an excess business loss gone forever?
No. The disallowed excess is not lost — it is treated as a net operating loss carried forward to future years, deductible against up to 80% of taxable income each year under current law. The practical cost is deferral (the time value of money) and the risk of using the deduction in a lower-bracket year, not permanent loss of the deduction.
Does married filing separately give a higher combined limit?
No. For 2026 each married-filing-separately spouse uses the single-filer threshold of $256,000, which is exactly half of the $512,000 joint figure — so filing separately does not expand the household's combined cap, and it often forfeits other tax benefits. There is no filing-status trick that raises the aggregate limit.
Do my wages count as business income for this test?
No. Under Section 461(l)(3)(B), W-2 wages are not treated as income from a trade or business in the Form 461 computation. That is the point of the rule: the threshold — not your salary — caps how much net business loss can offset nonbusiness income such as wages, interest, dividends, and portfolio gains.
Which loss rules apply before Section 461(l)?
The ordering is passive activity loss rules (Section 469) first, then the at-risk limits (Section 465), and only then the excess business loss limitation (Section 461(l)). A loss has to survive the first two tests before the $256,000/$512,000 threshold is even relevant, which is why passive investors are usually unaffected by the 2026 reset.
Does every state follow the federal excess business loss limit?
No. State conformity is uneven — some states adopt Section 461(l) in full, some decouple entirely, and others conform with modifications or as of an older date. Your state figure can differ from your federal figure in a loss year, so check your state's conformity before assuming the federal caps apply.
Sources
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.