What Is Portfolio Income and How Is It Taxed?

Portfolio income is the money you earn from investments you hold rather than from work or an active business. The IRS puts it in its own bucket, separate from earned income (wages and self-employment) and passive income (rentals and limited partnerships), and that separation drives how it is taxed, which losses can offset it, and whether Social Security and Medicare taxes apply. Interest, ordinary dividends, and short-term gains are taxed at your regular federal rates, which reach 37% for 2026. Qualified dividends and long-term capital gains get preferential rates of 0%, 15%, or 20%.

What Counts as Portfolio Income

The category covers returns on investments you own: interest, dividends, annuities, royalties, and gains from selling investment property.¹ In practice, that means:

Interest from savings accounts, CDs, and corporate or federal bonds.
Dividends paid by corporations to shareholders, split into “ordinary” and “qualified” for tax purposes.
Capital gains from selling stocks, bonds, mutual fund shares, or other investment assets for more than you paid.
Royalties for allowing others to use your intellectual property, mineral rights, or natural resources on investment land.
REIT distributions, which pass through rental and mortgage income. Ordinary REIT dividends are taxed at your regular rate, but up to 20% of qualified REIT dividends may be deductible under the Section 199A qualified business income deduction, made permanent by the One, Big, Beautiful Bill Act.²
Gains on cryptocurrency and other digital assets, which the IRS treats as property. Sales follow the same short- and long-term capital gains rules as stocks.³

One important exception sits inside the interest category. Interest from state and local government bonds (municipal bonds) is generally excluded from federal gross income.⁴ Hold munis in a taxable account and you owe no federal tax on the coupon, which is why they attract investors in high brackets.

Why the Category Matters

Being labeled portfolio income rather than passive or earned income has two concrete consequences.

First, passive activity losses cannot offset it. If your rental property throws off a loss for the year, that loss stays walled off from your dividend and interest income. The tax code specifically removes portfolio income from the passive activity calculation.¹

Second, portfolio income is not subject to Social Security or Medicare self-employment taxes. That is a 15.3% combined rate you avoid compared to money earned from a trade or business. High earners do face a separate 3.8% Net Investment Income Tax, covered below.

How Each Type Is Taxed

The rate you pay depends on what kind of portfolio income you received and how long you held the investment.

Interest income, short-term capital gains, and nonqualified dividends are taxed at your ordinary federal rate. For 2026, ordinary rates start at 10% on the first $12,400 of taxable income for a single filer (or $24,800 for married couples filing jointly) and climb to 37% on taxable income above $640,600 for single filers ($768,700 joint).⁵

Qualified dividends and long-term capital gains get their own, lower rate schedule.⁶ For 2026, the brackets for single filers and married couples filing jointly are:

0% on taxable income up to $49,450 (single) or $98,900 (joint).
15% on taxable income from $49,451 to $545,500 (single) or $98,901 to $613,700 (joint).
20% on taxable income above $545,500 (single) or $613,700 (joint).

The gap between the two schedules is the whole reason holding periods matter. A single filer in the 24% ordinary bracket who earns $1,000 in qualified dividends pays 15% on that money and keeps an extra $90 compared to earning the same $1,000 as interest.

Holding Periods That Change the Rate

To reach the long-term capital gains rates, you must hold the asset for more than one year before selling. Sell within a year and the profit is a short-term gain taxed at your ordinary rate. The clock runs from the day after you bought the asset through the day you sold it.⁷

Dividends run on a different clock. For a dividend to qualify for the lower rate, you must hold the stock at least 61 days during the 121-day window that begins 60 days before the ex-dividend date. Days when your risk of loss is reduced, such as through a protective put, do not count toward the 61 days.⁸

The Extra 3.8% for Higher Earners

On top of the rates above, high earners owe a 3.8% Net Investment Income Tax (NIIT) when modified adjusted gross income crosses:

$200,000 for single filers or head of household.
$250,000 for married filing jointly.
$125,000 for married filing separately.

The 3.8% applies to the smaller of your net investment income for the year or the amount by which your modified AGI exceeds the threshold.⁹ A single filer with $220,000 of modified AGI and $30,000 of net investment income owes 3.8% on $20,000 (the excess over the threshold, since it is the smaller of the two figures), or $760. These thresholds are not indexed for inflation, so more filers reach them each year.

When Losses and Wash Sales Come In

If your capital losses exceed your capital gains for the year, you can use up to $3,000 of the net loss against other taxable income ($1,500 if married filing separately).¹⁰ Anything above that carries forward indefinitely. A $15,000 net loss with no future gains would take at least five years to fully absorb against ordinary income.⁷

The wash sale rule can block a loss you thought you had. If you sell a security at a loss and buy back the same or a substantially identical security within 30 days before or after the sale, the loss is disallowed for that year.¹¹ The disallowed amount is not lost; it is added to your cost basis in the replacement shares, so it reduces your gain (or increases your loss) when you finally sell those shares. Brokers typically flag wash sales in Box 1g of Form 1099-B.

Paying Tax As You Go

Portfolio income usually arrives without any tax withheld. If you expect to owe $1,000 or more after withholding and refundable credits, the IRS wants quarterly estimated payments on Form 1040-ES. For the 2026 tax year, the deadlines are April 15, 2026; June 15, 2026; September 15, 2026; and January 15, 2027. You can skip the January payment if you file your 2026 return and pay any balance due by February 1, 2027.¹²

To dodge an underpayment penalty, your withholding plus estimated payments must cover the smaller of 90% of your 2026 tax or 100% of what you owed for 2025. If your 2025 AGI was above $150,000 ($75,000 if married filing separately), the prior-year safe harbor rises to 110% of the 2025 tax.¹² The penalty is based on the IRS’s quarterly underpayment interest rate applied to the shortfall for each quarter it went unpaid.¹³

Reporting It on Your Return

Banks, brokerages, and other payers send you tax forms each year that break down what you earned:

Form 1099-INT for taxable interest. Box 1 shows the total.¹⁴
Form 1099-DIV for dividends. Box 1a shows total ordinary dividends and Box 1b shows the qualified portion.⁸
Form 1099-B for proceeds from sales of stocks, bonds, and other securities, with purchase and sale dates and cost basis. Starting in 2026, brokers must also report cost basis for certain digital asset transactions.³
Schedule K-1 if you hold an interest in a partnership or S-corporation, showing your share of the entity’s investment income.

These figures flow onto your Form 1040. Interest and dividends go on Schedule B once totals cross $1,500 or other triggers apply. Capital gains and losses go on Schedule D, with individual transactions often detailed on Form 8949.¹⁵

One boundary worth knowing if any of your investments sit offshore: reporting foreign-held assets is a separate obligation. You may need to file FinCEN Form 114 (the FBAR) once the combined value of your foreign accounts tops $10,000 at any point during the year,¹⁶ and IRS Form 8938 has its own asset thresholds on top of that.¹⁷ These filings are informational; the income still gets reported through the usual portfolio channels above.

1
Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited
2
Office of the Law Revision Counsel. 26 U.S. Code 199A – Qualified Business Income
3
Internal Revenue Service. Digital Assets
4
Office of the Law Revision Counsel. 26 U.S. Code 103 – Interest on State and Local Bonds
5
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
6
Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
7
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
8
Internal Revenue Service. Instructions for Form 1099-DIV
9
Internal Revenue Service. Topic No. 559, Net Investment Income Tax
10
Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses
11
Office of the Law Revision Counsel. 26 U.S. Code 1091 – Loss From Wash Sales of Stock or Securities
12
Internal Revenue Service. Form 1040-ES Estimated Tax for Individuals
13
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
14
Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID
15
Internal Revenue Service. Instructions for Form 1040 and 1040-SR
16
FinCEN.gov. Report Foreign Bank and Financial Accounts
17
Internal Revenue Service. About Form 8938, Statement of Specified Foreign Financial Assets