Net Investment Income Tax on Rental Profits Explained (3.8%)

TL;DR: The Net Investment Income Tax (NIIT) is a 3.8% surtax on rental profits and other investment income once your modified adjusted gross income (MAGI) exceeds $200,000 (single) or $250,000 (married filing jointly). It applies to the smaller of your net investment income or the amount your MAGI exceeds the threshold, and it's reported on Form 8960. Active real estate professionals who materially participate in their rentals can sometimes avoid it entirely.

_Last reviewed: August 2026 · 7 min read_

You just closed the books on a good rental year and now someone mentions a 3.8% tax you've never heard of. The Net Investment Income Tax has been quietly attached to rental profits since 2013, and most landlords only find out about it when their accountant hands them a bill they didn't budget for.

Okoniq Property Hub logs your rental expenses and repair records throughout the year, so when tax season arrives you have the documentation needed to calculate net rental income accurately instead of guessing.

What exactly is the Net Investment Income Tax?

The NIIT is a 3.8% federal surtax on investment income, including rental profits, for taxpayers above certain income thresholds. It was created under the Affordable Care Act and took effect in 2013, and unlike many tax brackets, the thresholds have never been adjusted for inflation.

The tax applies to the lesser of two numbers: your total net investment income for the year, or the amount by which your MAGI exceeds the threshold for your filing status. So if your net investment income is $30,000 but you're only $10,000 over the threshold, you pay 3.8% on $10,000, not $30,000. Net investment income includes rental income, interest, dividends, capital gains, and royalties, minus allowable expenses tied to producing that income.

Rental profits count toward this calculation unless you qualify as a real estate professional and materially participate in the activity, which is a narrower carve-out than most landlords assume.

Who actually hits the income thresholds?

The thresholds are fixed at $200,000 MAGI for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately. These numbers haven't moved since 2013, which means more owner-operators cross them every year as rents and property values rise.

A landlord with $180,000 in W-2 income and $40,000 in net rental profit, filing single, has a MAGI of $220,000. That's $20,000 over the $200,000 threshold. Since $20,000 is less than the $40,000 in net investment income, the NIIT applies to $20,000, producing a tax bill of $760. Multiple rental properties or a spouse's income can push a household over these thresholds faster than expected, especially in markets where a well-maintained property commands premium rent.

Owners who track expenses carefully, including deferred maintenance items like the kind covered in 5 roof maintenance jobs you're forgetting every fall, often lower their net rental income enough to reduce or avoid NIIT exposure, since deductible repairs reduce the profit figure that gets taxed.

How does net rental income get calculated for this tax?

Net rental income for NIIT purposes is gross rents minus ordinary and necessary expenses, the same figure used on Schedule E. That means mortgage interest, property taxes, insurance, depreciation, and repairs all reduce the number that feeds into Form 8960.

This is where record-keeping earns its keep. A landlord who documents every repair, from patching drywall to fixing a leaking chimney flashing, has a paper trail that supports larger deductions and a lower net income figure. Owners who skip documentation often underclaim expenses out of caution, which inflates their taxable rental profit unnecessarily.

| Approach | Impact on Net Rental Income | |---|---| | Detailed expense logs, receipts kept year-round | Maximizes legitimate deductions, lowers NIIT exposure | | Estimated or reconstructed expenses at tax time | Often understated, higher taxable profit |

Deferred maintenance that turns into a bigger repair bill, like the kind of foundation issues described in 5 foundation cracks that are serious (and 3 that aren't), can actually work in your favor tax-wise the year you address it, since a larger deductible repair reduces that year's net rental profit.

Can landlords avoid or reduce the NIIT?

Yes, primarily through real estate professional status or by managing MAGI directly. To qualify as a real estate professional under IRS rules, you need to spend more than 750 hours per year in real estate activities and more than half of your total working time in real estate, with material participation in each rental you want excluded from NIIT.

For owner-operators who don't meet that bar, the more practical lever is reducing MAGI through retirement account contributions, timing capital gains, or accelerating deductible expenses like preventive maintenance into a high-income year. Someone planning a large siding or gutter project might time it deliberately, similar to the seasonal planning outlined in 5 gutter jobs you're forgetting before winter, to shift a deduction into the year it's most valuable.

Grouping elections and cost segregation studies can also increase depreciation deductions in early years, lowering net rental income and potentially keeping a landlord under the threshold altogether.

Does the NIIT apply if I sell a rental property?

Yes, capital gains from selling a rental property count as investment income for NIIT purposes and get added to your other net investment income for the year. A landlord who sells a property with a $150,000 gain in a year they're already over the MAGI threshold could owe an additional $5,700 in NIIT on that gain alone.

This is a common surprise for owners who sell after years of appreciation, since the gain often pushes MAGI well past $200,000 or $250,000 even if their regular income is modest. A 1031 exchange defers the capital gain, and with it, the NIIT liability, by rolling proceeds into another investment property rather than cashing out.

FAQ

Does the Net Investment Income Tax apply to all rental income?

No. It only applies to landlords whose MAGI exceeds $200,000 (single) or $250,000 (married filing jointly), and only to the portion of net rental income that pushes them over that threshold or the total net investment income, whichever is smaller.

Is the NIIT the same as self-employment tax?

No. Self-employment tax funds Social Security and Medicare and applies to active business income. The NIIT is a separate 3.8% surtax on passive investment income, including most rental profits, and the two rarely overlap for typical landlords.

Can rental losses offset the NIIT from other investment income?

Yes, if the losses are from passive rental activities and you have other net investment income like dividends or capital gains, a rental loss can reduce your total net investment income figure on Form 8960, lowering or eliminating the NIIT owed that year.

Do I need Form 8960 every year I have rental income?

Only if your MAGI exceeds the threshold for your filing status. Below $200,000 single or $250,000 married filing jointly, you don't calculate or owe the NIIT regardless of how much rental profit you generate.

Does owning rental property through an LLC change NIIT treatment?

Not by itself. A single-member LLC or a pass-through entity still reports rental income on your personal return, and the NIIT calculation works the same way. The structure matters more for liability protection than for this particular tax.

This is educational information, not tax advice. Talk to a CPA about how the Net Investment Income Tax applies to your specific MAGI, filing status, and rental portfolio.