Real Estate Tax Calc
What changed in 2026
The One Big Beautiful Bill Act (OBBBA), signed July 4, 2025, reshaped the tax environment for real estate investors beginning in 2026. The most investor-relevant provisions were confirmed in subsequent IRS guidance. IRS Notice 2026-11 addressed the restoration of 100% first-year bonus depreciation under IRC § 168(k) for qualifying property acquired after January 19, 2025, reversing the phased reduction that had brought the rate down to 40% in 2025. The OBBBA also made the 20% qualified business income (QBI) deduction under § 199A permanent and raised the Section 179 expensing limit to $2.5 million.
Separately, IRS Notice 2026-40 (issued June 18, 2026) established transition rules for the Qualified Opportunity Zone program, which the OBBBA permanently extended with new rolling 10-year designation cycles. Under that notice, property acquired after December 31, 2026 in original QOZ 1.0 tracts generally will not qualify as Qualified Opportunity Zone Business Property (QOZBP) unless a written working capital safe harbor plan is in place before year-end. Summaries of Notice 2026-40 were published by Greenberg Traurig (gtlaw.com) and the National Law Review (natlawreview.com).
These are not small changes. Together they create a cluster of year-end deadlines and a window of depreciation opportunity that closes at midnight on December 31, 2026.
Why it matters to investors
December 31 is not just a tax-return deadline this year — it is an action deadline. At least two specific events are triggered by the calendar flip to 2027, and missing either has lasting consequences.
First, the QOZ 1.0 gain-deferral period ends. Investors who deferred capital gains by investing in a Qualified Opportunity Fund before January 1, 2027 must include those gains in their 2026 federal taxable income regardless of whether the fund distributes anything. The gains retain their original character (typically long-term capital gain), and the tax is due with the 2026 return. Use the capital gains calculator to estimate the 2026 federal bill. Budget for the payment before year-end so the liability does not surprise estimated-tax calculations.
Second, under Notice 2026-40, any Qualified Opportunity Zone Business that expects to acquire new property in a QOZ 1.0 tract after December 31 must have a written working capital safe harbor plan in place and must have deployed a specified portion of working capital by year-end to preserve QOZBP status. Once December 31 passes, the chance to establish a plan for 2027 acquisitions in legacy tracts may be gone.
On the opportunity side, 100% bonus depreciation makes the fourth quarter of 2026 an unusually productive time to place qualifying property in service. Assets bought and placed in service by December 31 — including short-lived personal property identified in a cost segregation study — are eligible for a full first-year write-off under the 100% rate confirmed in Notice 2026-11, per IRS Publication 946. A property placed in service on January 1, 2027 is still eligible, but there is no benefit to delay.
What to do before December 31
QOF investors: estimate and set aside the 2026 gain-inclusion tax. The deferred gain must be recognized whether or not cash comes out of the fund. Review cumulative gains deferred across all QOF positions, estimate the 2026 federal and state tax at your expected marginal rates, and confirm that your fourth-quarter estimated tax payment (due January 15, 2027) reflects this liability. Review your fund’s status regarding the working capital safe harbor if the fund holds or plans to acquire property in original QOZ 1.0 tracts after year-end.
Active investors placing property in service this year: commission or finalize a cost segregation study. Under 100% bonus depreciation, the study’s reclassified personal property (5-, 7-, and 15-year assets) generates a dollar-for-dollar first-year deduction. The study must be completed and the assets placed in service by December 31 to count for 2026. For a recently acquired commercial or multifamily property, the window is closing.
Anyone mid-exchange: verify the 45-day and 180-day clock. A relinquished property that closed in October 2026 has a 45-day identification deadline in late November and a 180-day closing deadline in April 2027. A sale that closed in November or December requires filing a tax return extension (Form 4868 or 7004) to preserve the full 180-day exchange period; otherwise the window closes at the April filing deadline. Use the 1031 exchange calculator to confirm the deadlines for your specific closing date.
Rental property owners: catch up on unclaimed depreciation via Form 3115. If prior-year depreciation was omitted or understated, IRS guidance allows investors to claim a catch-up deduction in the current year by filing Form 3115 (Change in Accounting Method). The IRS taxes depreciation on an “allowed or allowable” basis, meaning recapture is owed at sale regardless of whether the deduction was actually claimed. Claiming the catch-up produces a current-year deduction while leaving the ultimate recapture exposure unchanged.
These steps are general planning context. Specific thresholds and deadlines in IRS Notice 2026-40 and Notice 2026-11, and any Treasury regulations that follow, should be confirmed with a qualified tax professional before acting.
Worked example: estimating the 2026 QOF gain-inclusion tax
The gain-inclusion event catches many investors off guard because it generates a tax bill with no corresponding cash. A concrete example shows the mechanics. Suppose an investor rolled a $500,000 long-term capital gain into a Qualified Opportunity Fund in 2021 and has held the investment continuously since. Because the five-year holding period was satisfied before the program’s basis step-ups expired, the investor’s basis in the deferred gain was increased by 10%, to $50,000.
On December 31, 2026, the amount included in income is the lesser of the remaining deferred gain or the fund interest’s fair market value, reduced by that basis. Assuming the fund is worth at least the original gain, the investor includes $500,000 − $50,000 = $450,000 of long-term capital gain on the 2026 return. At a 20% top long-term capital gains rate plus the 3.8% net investment income tax, the federal bill is roughly $450,000 × 23.8% = $107,100, before any state tax. The capital gains calculator can refine this at the investor’s actual marginal rate.
The important planning point: that $107,100 is owed whether or not the fund distributes a dollar. An investor who assumed the Opportunity Zone benefit was “tax-free” and set nothing aside can face a six-figure April liability plus an underpayment penalty. Separately, investors who continue to hold the QOF for a total of ten years can still elect to step the fund interest’s basis up to fair market value on a later sale, eliminating tax on post-investment appreciation — that second benefit is unaffected by the 2026 inclusion of the original deferred gain.
Worked example: 100% bonus depreciation on a Q4 acquisition
On the opportunity side, consider an investor who closes on a $2,000,000 commercial property in November 2026, with $400,000 allocated to land and $1,600,000 to the building. A cost segregation study reclassifies 25% of the building basis — $400,000 of 5-, 7-, and 15-year personal property and land improvements — out of the 39-year recovery class.
Under the 100% first-year bonus depreciation rate confirmed in Notice 2026-11, that entire $400,000 is deductible in 2026 as long as the property is placed in service by December 31. For an investor in the 37% federal bracket who can use the loss (subject to the passive activity and excess business loss rules discussed below), the reclassification produces roughly $148,000 in first-year federal tax savings, plus any state benefit. The remaining $1,200,000 of building basis continues on the standard 39-year straight-line schedule.
The deadline is strict. A study finalized in January 2027, or a property that is not actually placed in service — ready and available for its intended use — until 2027, pushes the entire deduction into the 2027 tax year. For a late-year closing, confirming the in-service date and commissioning the study promptly is what preserves the 2026 write-off.
Passive loss, NIIT, and excess business loss interactions
A large bonus depreciation deduction is only valuable if the investor can actually use it against income. For most individual investors, rental real estate is a passive activity under IRC § 469, and passive losses can offset only passive income unless an exception applies. The two common exceptions are the $25,000 special allowance for actively participating landlords (phased out between $100,000 and $150,000 of modified AGI) and real estate professional status under § 469(c)(7), which requires meeting the 750-hour and more-than-half-of-personal-services tests and materially participating in the rental activity.
Investors pursuing the short-term rental strategy sometimes avoid the passive label entirely: a rental with an average guest stay of seven days or less is not a “rental activity” under the § 469 regulations, so a materially participating owner can treat the loss as non-passive. This is the mechanism behind the widely discussed “STR loophole,” and it is a reason some investors accelerate a short-term rental purchase into Q4.
Even for investors who can use the loss, the excess business loss limitation of IRC § 461(l) caps the net business loss an individual can deduct against non-business income (the 2025 threshold was $313,000 for single filers and $626,000 for joint filers, indexed annually). Losses above the cap are not lost but carry forward as a net operating loss. Finally, reducing adjusted gross income with these deductions can also pull income below the 3.8% net investment income tax threshold, compounding the benefit. Modeling these limits before year-end determines how much of a planned deduction is actually usable in 2026.
The state-tax angle
Federal planning moves do not automatically translate to state tax savings. Roughly twenty states decouple from federal bonus depreciation, requiring investors to add the federal bonus deduction back to state taxable income and then recover it over the asset’s regular life. In those states, a cost segregation study still accelerates the federal deduction but produces a smaller or deferred state benefit, and it creates a separate state depreciation schedule the investor must track for the life of the property.
Opportunity Zone conformity varies even more sharply. Several states, most notably California, never conformed to the federal Opportunity Zone deferral and exclusion rules at all — investors in those states paid state tax on the original gain in the year of investment and will not owe a second state tax on the 2026 federal inclusion. Other states conform fully and will tax the 2026 inclusion in step with the federal return. Because the gain is typically sourced to the investor’s state of residence, a relocation between the investment year and 2026 can change which state has the claim. Confirm conformity with a professional in each relevant state before assuming a federal result carries through.
Common year-end mistakes to avoid
Assuming the Opportunity Zone benefit is fully tax-free. The headline exclusion applies only to appreciation inside the fund after a ten-year hold. The originally deferred gain was always going to be taxed, and 2026 is the year. Treating the two as the same benefit is the single most expensive QOZ misunderstanding.
Confusing “placed in service” with “purchased.” Bonus depreciation and cost segregation turn on the date an asset is ready and available for its intended use, not the closing date. A property bought in December but not rent-ready until January is a 2027 deduction.
Letting a 1031 identification window lapse. The 45-day identification period is absolute — there are no extensions for weekends, holidays, or missed paperwork, and a day-46 identification disqualifies the exchange. Use the 1031 exchange calculator to lock the exact dates from the relinquished-property closing.
Ignoring estimated-tax safe harbors. A surprise six-figure inclusion or a large capital gain can trigger an underpayment penalty even when the balance is paid by April. Covering 110% of the prior-year liability (for higher-income taxpayers) through the January 15, 2027 fourth-quarter payment generally preserves the safe harbor. Skipping Form 3115 on missed depreciation. Because recapture is owed on an “allowed or allowable” basis at sale, failing to claim depreciation costs the deduction without reducing the eventual recapture — a strictly worse outcome than filing the change-of-accounting-method catch-up.
Looking ahead to 2027
Year-end decisions should be made with an eye on the following year. With 100% bonus depreciation now a stable feature rather than a phasing-down one, there is less pressure to rush an acquisition purely for depreciation timing — the same rate applies to a property placed in service on January 1, 2027. The real urgency sits with the events that genuinely close on December 31: the QOZ 1.0 gain inclusion and the Notice 2026-40 working-capital safe harbor deadline for legacy tracts.
For investors weighing a new Opportunity Zone investment, the OBBBA’s permanent rolling 10-year designation cycles create fresh deferral opportunities going forward, but under different rules than QOZ 1.0. Matching a 2027 capital gain to a new-cycle fund, rather than a legacy tract, is the forward-looking version of the same strategy. As always, the planning context here is general; the governing thresholds live in the statute, IRS notices, and forthcoming Treasury regulations, and a qualified advisor should confirm the specifics for any individual situation before year-end.
Frequently asked questions
Why do Opportunity Zone investors owe tax in 2026 even if they don’t sell?
Under the original Qualified Opportunity Zone rules, gain deferred by investing in a QOF before January 1, 2027 must be included in income in the taxable year containing December 31, 2026 — regardless of whether the investor sells or receives any cash. This is the statutory gain-inclusion event that has always been built into QOZ 1.0. The tax is on the originally deferred gain, not on the fund’s current value.
Can I still get 100% bonus depreciation on property placed in service in December 2026?
Yes. Under the OBBBA as confirmed in IRS Notice 2026-11, qualifying property acquired after January 19, 2025 and placed in service in 2026 is eligible for 100% first-year bonus depreciation. The property must meet the definition of qualified property under IRC § 168(k). A cost segregation study can identify short-lived personal property components of a building eligible for the full deduction. Confirm your specific property’s eligibility with a tax professional.
Does 100% bonus depreciation create a loss I can actually use this year?
Not always. For most investors, rental real estate is a passive activity, so a bonus depreciation loss offsets only passive income unless the investor qualifies for the $25,000 special allowance, real estate professional status, or the short-term rental exception. The excess business loss limitation under IRC § 461(l) can further cap the deductible loss, carrying the excess forward as a net operating loss. Model these limits before assuming the full deduction reduces this year’s tax.
Will my state tax the 2026 Opportunity Zone gain inclusion too?
It depends on state conformity. States that follow the federal Opportunity Zone rules will generally tax the 2026 inclusion in step with the federal return. States that never conformed — California is the prominent example — already taxed the gain in the year of investment and will not tax it again in 2026. Because the gain is usually sourced to your state of residence, a move between the investment year and 2026 can change the answer. Confirm with a professional in each relevant state.
What happens to a 1031 exchange that closes in late 2026?
The 45-day identification clock and 180-day closing clock run from the date the relinquished property closes, not from year-end. A property sold in October 2026 has roughly a late-November identification deadline and an April 2027 closing deadline. A sale closing in November or December may require filing a tax-return extension (Form 4868 for individuals or 7004 for entities) to preserve the full 180-day period, because otherwise the exchange window is cut short at the unextended filing deadline. The 1031 exchange calculator confirms the exact dates for a given closing.
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.