Net Investment Income Tax on Real Estate: What Investors Owe in 2026

Trend context — not a specific IRS announcement

The Net Investment Income Tax (NIIT) under IRC § 1411 has applied to real estate investors since 2013, but it is frequently underestimated in tax planning. The One Big Beautiful Bill Act (OBBBA, P.L. 119-21, July 4, 2025) permanently extended bonus depreciation and several related provisions, changing the annual math on how much net investment income a landlord or investor reports. The NIIT itself is unchanged: the rate is still 3.8% and the modified adjusted gross income thresholds are still $200,000 for single filers and $250,000 for married filing jointly. Those thresholds are not indexed for inflation. This post surveys how the NIIT applies to common real estate transactions and what 2026 planning considerations apply. Sources: IRS Form 8960 (Net Investment Income Tax); CrowdfundedWealth, “Net Investment Income Tax and Form 8960 on Real Estate (2026)”.

Why it matters to investors

For an investor whose MAGI clears the threshold, the 3.8% NIIT stacks on top of every other federal rate. A rental-property sale splits the gain into at least two buckets: unrecaptured Section 1250 gain (the depreciation portion, capped federally at 25%) and regular long-term capital gain (0%, 15%, or 20%). The NIIT applies on top of both. That pushes the effective federal rate on the unrecaptured § 1250 slice to as much as 28.8% and on regular long-term gain to as much as 23.8%. On a $400,000 combined gain, the surtax alone is up to $15,200. Passive rental income — not just gains — is also net investment income and subject to the surtax for landlords above the threshold.

Three planning levers can reduce or eliminate the NIIT. Short-term rental material participation (average guest stay ≤ 7 days, plus the owner meeting a material-participation test such as 500+ hours under Treas. Reg. § 1.469-5T) moves the activity outside the passive-rental rules, and non-passive trade-or-business income is excluded from net investment income. Real estate professional status (REPS) under IRC § 469(c)(7) — more than 750 hours and more than half of personal-service time in real property businesses — converts all rental activities to non-passive and likewise excludes them from NII. For investors who cannot qualify under either route, large first-year depreciation deductions from cost segregation paired with permanent 100% bonus depreciation (see IRS Notice 2026-11, summarized by CBIZ) can reduce passive net income to near zero in early years of ownership, legally shrinking the NII base even for purely passive investors.

What to do

Model all three rate layers before listing any property. A sale analysis that applies only the capital gains rate and misses the NIIT can underestimate the federal tax bill by $10,000–$20,000 on a mid-sized rental exit. Run the unrecaptured § 1250 rate, the long-term capital gains rate, and the 3.8% NIIT as three separate line items.

Work through Form 8960 before year-end. The form is a single-page calculation. Running it in advance shows how much rental income or gain falls inside the surtax base, and whether a large depreciation deduction or a passive loss release could reduce it.

Factor the deferred NIIT into 1031 exchange planning. A 1031 like-kind exchange defers the gain and defers the NIIT on it. Each year the replacement property is held, the deferred surtax is not paid; a step-up in basis at death eliminates both the capital gain and the accumulated NIIT on appreciation. That deferral benefit is part of the full economic value of a 1031 exchange and should appear in the analysis when comparing exchange versus taxable sale.

Trend context only — not a specific IRS announcement and not tax advice. Sources: IRS Form 8960; IRS Notice 2026-11 (January 14, 2026), summarized by CBIZ; CrowdfundedWealth NIIT guide (2026). Consult a qualified tax professional before acting.

Worked example — a rental sale with the surtax layered on

Consider a married couple filing jointly who bought a residential rental for $500,000 ($400,000 building, $100,000 land) and held it for ten years. Straight-line depreciation over 27.5 years on the $400,000 building is about $14,545 per year, so accumulated depreciation reaches roughly $145,450 and the adjusted basis falls to $354,550. They sell for a net $720,000 after closing costs, producing a total gain of $365,450.

The gain splits into two slices. The unrecaptured Section 1250 gain equals the lesser of accumulated depreciation or total gain — here the full $145,450 — taxed at a maximum federal rate of 25%. The remaining $220,000 is regular long-term capital gain, taxed at 20% for a couple in the top bracket. Because their MAGI (which includes this gain) clears the $250,000 threshold by more than the size of the gain, the entire $365,450 is also net investment income.

Layering the surtax on top, the § 1250 slice runs 25% + 3.8% = 28.8%, or $41,890; the capital-gain slice runs 20% + 3.8% = 23.8%, or $52,360. Federal tax on the gain totals about $94,250, of which the NIIT alone is $13,887. A seller who modeled only the 20% and 25% rates and forgot the surtax would have under-budgeted by nearly $14,000 on this single transaction.

How the 3.8% is actually computed: the lesser-of rule

The surtax is never simply 3.8% of all investment income. Under IRC § 1411, the tax equals 3.8% multiplied by the lesser of (a) net investment income or (b) the amount by which MAGI exceeds the threshold. For most investors MAGI equals adjusted gross income; the few add-backs (such as the foreign earned income exclusion) rarely apply to domestic landlords.

A single filer with MAGI of $230,000 and $50,000 of net investment income shows the mechanics. MAGI exceeds the $200,000 threshold by $30,000. The lesser of $50,000 (NII) and $30,000 (the MAGI excess) is $30,000, so the surtax is 3.8% × $30,000 = $1,140 — not 3.8% of the full $50,000. This is why a taxpayer whose income only slightly clears the threshold pays surtax on just the slice above it, while a large one-time sale that pushes MAGI far over the line can expose essentially the entire gain.

Form 8960, line by line

The surtax is reported on Form 8960, Net Investment Income Tax, which flows to Schedule 2 of Form 1040. Part I gathers investment income: taxable interest, ordinary dividends, annuities, net rental and royalty income (line 4a, tied to Schedule E), and net gain from dispositions (line 5a, tied to Schedule D and Form 4797). Part II subtracts allocable investment expenses — investment interest expense, the portion of state and local income tax attributable to net investment income, and similar items.

Part III performs the lesser-of calculation. Line 12 is total net investment income, line 13 is MAGI, line 14 is the filing-status threshold, line 15 is MAGI minus the threshold, line 16 is the smaller of lines 12 and 15, and line 17 multiplies line 16 by 3.8%. Because the form is a single page, running it before year-end is the fastest way to see how much rental income or gain actually lands inside the surtax base and whether a deduction or a loss release could pull it back out.

Edge cases: filing status, trusts, and the home-sale exclusion

The thresholds differ by status: $200,000 for single and head-of-household filers, $250,000 for married filing jointly, and only $125,000 for married filing separately. None are indexed for inflation, so every year of wage and rent growth pulls more taxpayers over the line — a slow-motion expansion of the surtax base that makes long-range planning worthwhile.

Estates and trusts face the surtax at a dramatically lower threshold: the dollar figure at which the top trust tax bracket begins, roughly $15,000–$16,000 and indexed annually. A trust that holds rental property can therefore owe the 3.8% on nearly all of its retained net investment income. Distributing that income to beneficiaries whose own MAGI sits below their individual threshold — carrying it out as distributable net income — is a common way to escape the compressed trust rates.

A primary residence sale is largely protected. Gain excluded under IRC § 121 ($250,000 single / $500,000 joint) is not net investment income, so it never touches the surtax. Only taxable gain above the exclusion — and any depreciation recapture from a period the home was rented or used as a home office — falls into the NII base.

Common mistakes investors make with the surtax

The most frequent error is forgetting that the gain itself inflates MAGI. An investor who is comfortably below the threshold in a normal year can be thrown far over it by a single large sale, so the surtax applies in the exact year they assumed they were safe. Always model MAGI with the gain included.

A second mistake is assuming real estate professional status automatically erases the NIIT. REPS converts rentals to non-passive for the § 469 loss rules, but excluding the income from net investment income additionally requires that the rental rise to a trade or business and meet the Treas. Reg. § 1.1411-4(g)(7) safe harbor (more than 500 hours per year, or in 5 of the last 10 years). A third is treating all short-term-rental income as exempt — a short average guest stay only avoids the per-se passive rental classification; the owner still has to materially participate for the income to be non-passive and outside the NII base.

Interactions: passive losses, installment sales, and 1031

Suspended passive losses freed on a fully taxable disposition reduce net investment income in the year of sale, because they offset the same passive gain that would otherwise be surtaxed. Sellers sitting on years of disallowed passive losses often find the NIIT on an exit is far smaller than a gross-gain estimate suggests.

An installment sale under IRC § 453 recognizes capital gain as payments are received, spreading the NII across multiple years and sometimes keeping MAGI under the threshold in some of them. Depreciation recapture taxed as ordinary income is accelerated into the year of sale under § 453(i), though the unrecaptured § 1250 gain itself spreads with the installments. A 1031 like-kind exchange defers the entire gain and the surtax on it; held until death, the basis step-up can eliminate both permanently, which is why the deferred 3.8% belongs in any exchange-versus-sale comparison. This is general information, not tax advice; consult a qualified professional before acting.

Frequently asked questions

Does the 3.8% NIIT apply to all rental income?

Only if your modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly) and the rental activity is passive. Income from a materially participated short-term rental where the average guest stay is seven days or fewer, or from a qualifying real estate professional's portfolio, is excluded from net investment income and is not subject to the surtax.

Is the gain from selling a rental property subject to NIIT?

Generally yes, if your MAGI exceeds the threshold. The gain -- including both the regular long-term capital gain and the unrecaptured Section 1250 portion taxed at up to 25% -- is typically net investment income subject to the additional 3.8%. A 1031 like-kind exchange defers the gain and also defers the NIIT on it.

How is the 3.8% surtax actually calculated?

It equals 3.8% multiplied by the lesser of your net investment income or the amount by which your modified adjusted gross income exceeds your filing-status threshold. For example, a single filer with $230,000 of MAGI and $50,000 of net investment income owes the surtax on only $30,000 -- the amount above the $200,000 threshold -- for a tax of $1,140, not on the full $50,000. A large sale that pushes MAGI far over the line, however, can expose nearly all of the gain.

Does real estate professional status eliminate the NIIT on my rentals?

Not by itself. REPS (more than 750 hours and more than half your personal-service time in real property businesses) makes rental income non-passive for the Section 469 loss rules. To also keep that income out of net investment income, the rental must rise to a trade or business and you generally need to satisfy the Treasury Regulation Section 1.1411-4(g)(7) safe harbor -- more than 500 hours in the activity per year, or in 5 of the last 10 years. Meeting REPS without meeting that safe harbor does not automatically exempt the income.

Are estates and trusts that own rental property subject to the NIIT?

Yes, and at a far lower threshold than individuals. For trusts and estates the surtax applies above the dollar amount where the top trust tax bracket begins -- roughly $15,000 to $16,000, indexed annually -- so a trust can owe 3.8% on nearly all of its retained net investment income. Distributing that income to beneficiaries whose own MAGI is below their individual threshold (as distributable net income) is a common way to avoid the compressed trust rates.

Does the home-sale exclusion protect me from the surtax?

Largely, yes. Gain excluded under IRC Section 121 -- up to $250,000 single or $500,000 joint on a qualifying primary residence -- is not net investment income and never touches the NIIT. Only taxable gain above the exclusion, plus any depreciation recapture from periods the home was rented or used as a home office, falls into the NII base.

Sources

Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.

Net Investment Income Tax on Real Estate in 2026