Is Investing Passive Income? IRS Rules, NIIT, and Rental Losses

Investing is generally not passive income in the eyes of the IRS. Dividends, interest, capital gains, and mutual fund distributions belong to a separate tax category called portfolio income. The word “passive” in everyday speech means “I’m not doing anything to earn it,” but the tax code uses the term more narrowly, and confusing the two categories on a return can cost you real money.

Why the Label Matters

Section 469 of the Internal Revenue Code defines a passive activity as a trade or business in which the taxpayer does not materially participate, plus nearly all rental activities regardless of how much time the owner puts in.¹ The framework was built to stop taxpayers from using paper losses in side ventures to shelter wages and salary.

Portfolio income sits outside that framework. The statute specifically carves out interest, dividends, annuities, and royalties not earned in the ordinary course of a trade or business, along with gains from selling investment property.¹ That language captures almost everything a normal brokerage account produces.

The practical consequence is the loss-offset rule. Passive losses can only offset passive income. Portfolio income has its own bucket, and capital losses have their own rules. So if you own a rental property running a loss, you generally cannot use that loss to reduce the tax on your stock dividends and bond interest. Filing as if you could is the kind of error that can draw an accuracy-related penalty of 20% of the underpayment, or 75% if the IRS finds the error was fraudulent.²

How Common Investments Are Classified

Stocks, Bonds, and Mutual Funds

Dividends from individual stocks, interest from corporate or government bonds, and distributions from mutual funds are all portfolio income.³ Capital gains from selling these holdings are portfolio income too. The classification does not change based on how long you held the asset or how little effort was involved. The tax code sorts by the nature of the income, not by your effort level.

REITs

Real Estate Investment Trust dividends might feel like rental income, but the IRS treats ordinary REIT dividends and capital gain distributions as portfolio income.³ Owning REIT shares is not the same as owning a rental property for passive activity purposes, and you cannot offset REIT dividends with passive rental losses.

Limited Partnerships and S-Corporation Interests

This is where investment income does typically land in the passive bucket. Income from a limited partnership where you are a limited partner is generally passive, because your legal role restricts you from day-to-day management.¹ The same applies to an S-corporation interest where you don’t materially participate. Passive income from one such activity can offset passive losses from another.

Rental Real Estate

Rental activities are passive by default, even when you spend significant time managing the property. The main exception is for taxpayers who qualify as real estate professionals.⁴ Some short-term rentals fall outside the rental category entirely: when the average customer stay is seven days or fewer, the IRS treats the activity as a trade or business, and if you materially participate the income becomes active. A similar rule applies when the average stay is 30 days or fewer and you provide substantial personal services. Properties rented for fewer than 15 days in the year get separate treatment again — you do not report the income and cannot deduct rental expenses.⁵

Royalties

Royalties from intellectual property or mineral rights usually land in portfolio income when you receive them as a return on property you own but do not actively manage. If the royalties flow from a trade or business in which you participate, the classification can shift. The origin of the stream determines where it sits.

When a Business Interest Really Is Passive

Whether a trade or business generates passive or active income turns on whether you materially participate. The IRS has seven tests, and satisfying any one of them makes the activity non-passive.⁴ The most common ones are participating more than 500 hours in the activity during the year, doing substantially all the work in the activity, or participating more than 100 hours when no one else participates more than you do. There are also lookback tests based on participation in prior years.

If none of the tests are met, income from that business flows through as passive. That is the situation in which an investor holding a stake in a private venture actually generates true passive income under the code — and true passive losses that can offset it.

Proving participation requires documentation. The IRS looks for contemporaneous records: appointment books, calendars, logs, or narrative summaries describing the work performed and the time spent. Reconstructing hours from memory during an audit is a losing strategy.

The $25,000 Rental Loss Allowance

Rental income is passive by default, but the code carves out a meaningful exception for hands-on landlords. If you actively participate in a rental real estate activity, you can deduct up to $25,000 in passive rental losses against non-passive income such as wages or portfolio income each year.¹

Active participation is a lower bar than material participation. You meet it by making genuine management decisions: approving tenants, setting rental terms, authorizing repairs. You also need to own at least 10% of the property by value.⁴

The $25,000 allowance phases out as modified adjusted gross income rises above $100,000, shrinking by $1 for every $2 of MAGI above the threshold. At $150,000 MAGI, the allowance is gone. These dollar figures are fixed in the statute and are not adjusted for inflation. For married individuals filing separately who lived apart all year, the allowance drops to $12,500 with a phase-out beginning at $50,000 MAGI.⁴

A qualifying real estate professional escapes the passive activity trap for rentals entirely. To qualify, more than half of all your personal services across all trades and businesses must be in real property trades or businesses, and you must log more than 750 hours in those real property activities. Both conditions must be met in the same tax year.⁴ Someone working a full-time non-real-estate job will find the “more than half” requirement nearly impossible to satisfy, which is why this exception is narrow.

The Net Investment Income Tax Applies to Both

One place the passive-versus-portfolio distinction does not save anyone is the Net Investment Income Tax. The 3.8% NIIT applies to investment income once your income crosses certain thresholds, and it sweeps in both portfolio income and passive business income.⁶ The tax applies to whichever is smaller: your net investment income, or the amount by which your MAGI exceeds the threshold for your filing status.

Married filing jointly or qualifying surviving spouse: $250,000
Single or head of household: $200,000
Married filing separately: $125,000

These thresholds are not indexed for inflation and have not changed since the tax took effect in 2013.⁷ Net investment income for NIIT purposes includes interest, dividends, capital gains, rental and royalty income, and income from passive business activities. Wages and active business income are excluded.

What Happens to Passive Losses You Cannot Use

When your passive losses exceed your passive income for the year, the excess is not lost. It carries forward indefinitely and can offset passive income in any future year.⁴ Suspended losses accumulate activity by activity, so a rental property that generates $10,000 in disallowed losses each year builds a growing balance that waits either for enough passive income or for a qualifying disposition.

The payoff comes when you dispose of your entire interest in the activity in a fully taxable transaction. At that point, all accumulated losses are released and can offset any type of income, including wages and portfolio income.¹ An investor carrying $80,000 in suspended rental losses can deduct the full amount in the year they sell the property.

Some conditions limit the release. Sales to related parties, as defined under Sections 267(b) and 707(b)(1), do not trigger the deduction until the property is later sold to an unrelated buyer. For installment sales, the suspended losses are released proportionally as gain is recognized each year. When a taxpayer dies, suspended losses are deductible on the final return only to the extent they exceed the step-up in basis the heir receives. Any losses absorbed by that basis step-up disappear permanently.¹

So the short version for anyone wondering whether their investing counts as passive income: for a standard portfolio of stocks, bonds, funds, and REITs, no. For a rental property or a private business interest where you don’t materially participate, yes — and that yes is what unlocks the loss-offset rules that make the classification worth paying attention to in the first place.

1
Office of the Law Revision Counsel. 26 USC 469 – Passive Activity Losses and Credits Limited
2
Internal Revenue Service. Accuracy-Related Penalty
3
Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses
4
Internal Revenue Service. Publication 925 (2025), Passive Activity and At-Risk Rules
5
Internal Revenue Service. Topic No. 415, Renting Residential and Vacation Property
6
Internal Revenue Service. Topic No. 559, Net Investment Income Tax
7
Internal Revenue Service. Questions and Answers on the Net Investment Income Tax