Are Money Market Funds Taxed as Capital Gains or Ordinary Income?

Money market fund earnings are almost always taxed as ordinary income rather than capital gains. The distributions you receive come from interest the fund collects on short-term debt, and that income is taxed at your marginal federal rate, which runs from 10% to 37% for tax year 2026. A capital gain only enters the picture in the narrow case where you sell shares at a price different from what you paid, and for most retail investors that price stays fixed at $1.00.

Why the Income Is Ordinary

A money market fund holds Treasury bills, commercial paper, certificates of deposit, and similar short-term debt. The fund collects interest on those holdings and passes it through to you. Even though your brokerage reports the payout as a dividend, the underlying source is interest, and it is taxed accordingly.

The reason for the label mismatch is structural. Money market funds are regulated investment companies, so the IRS treats their payouts as dividends for reporting purposes. Your fund reports the amount in Box 1a of Form 1099-DIV alongside ordinary dividends from stock funds.¹

The other piece is the stable share price. Most money market funds peg their net asset value at $1.00.² Because the price does not move, there is nothing to appreciate. Your entire return is income, and that income does not meet the source or holding-period tests for qualified dividends or long-term capital gains, so it does not qualify for the lower preferential rates.³

What Rate You Actually Pay

Money market fund distributions are taxed at your marginal federal rate. For 2026, those brackets are:

10% on taxable income up to $12,400 (single) or $24,800 (married filing jointly)
12% over $12,400 up to $50,400 (single) or over $24,800 up to $100,800 (joint)
22% over $50,400 up to $105,700 (single) or over $100,800 up to $211,400 (joint)
24% over $105,700 up to $201,775 (single) or over $211,400 up to $403,550 (joint)
32% over $201,775 up to $256,225 (single) or over $403,550 up to $512,450 (joint)
35% over $256,225 up to $640,600 (single) or over $512,450 up to $768,700 (joint)
37% over $640,600 (single) or over $768,700 (joint)

These brackets apply regardless of how long you have held your fund shares.⁴

Reinvested Distributions Still Count

If you have set your account to reinvest automatically, you owe tax on every dollar reinvested in the year it is earned. The cash never hitting your checking account changes nothing. The fund reports the full distribution on Form 1099-DIV whether you took the cash or bought more shares.⁵ Reinvestment does add to your cost basis, which matters only in the unusual case where you later sell shares at a price other than $1.00.

Backup Withholding

If you have not given your fund administrator a Taxpayer Identification Number, or the IRS has flagged your account for underreporting, the fund withholds a flat 24% from your distributions. This is not an extra tax. It is a prepayment credited against what you owe when you file.⁶

The 3.8% Net Investment Income Tax

Higher-income investors owe an additional 3.8% on net investment income, which includes money market fund dividends. It applies to the lesser of your net investment income or the amount your modified adjusted gross income exceeds these thresholds:⁷

$200,000 for single or head of household
$250,000 for married filing jointly or qualifying surviving spouse
$125,000 for married filing separately

These thresholds are not indexed for inflation and have not changed since the tax took effect in 2013, so more taxpayers cross them each year as nominal incomes rise. A large money market balance generating steady dividends can push a near-threshold filer over. At the top bracket, the effective federal rate on money market income reaches 40.8%.⁸

When Capital Gains Actually Apply

A capital gain or loss on money market fund shares happens only when you sell shares at a price different from what you paid. For most funds that is rare, because the share price is engineered to stay at $1.00.

The exception is institutional prime and institutional municipal money market funds. Under SEC reforms, these funds must trade at a floating net asset value calculated to four decimal places rather than rounding to a stable $1.00.⁹ A share might be $1.0003 one day and $0.9998 the next, and each sale can throw off a small gain or loss. Retail and government money market funds still keep the stable $1.00 price, so capital gains are essentially nonexistent for individuals in those categories.²

When a gain does occur, the holding period matters. Shares held a year or less produce short-term gains taxed at ordinary rates. Shares held longer produce long-term gains at the preferential rates. Money market shares turn over constantly from reinvestment, so any realized gain is usually short-term anyway.

Municipal Money Market Funds

Municipal money market funds hold short-term debt from state and local governments. The interest is excluded from federal gross income under 26 U.S.C. § 103.¹⁰ When the fund passes that income to you, it keeps its tax-exempt character and is reported as an exempt-interest dividend. If the fund holds bonds from your state of residence, the income may also be exempt from state and local income tax, which is why some investors in high-tax states use single-state municipal funds.

Not all municipal income escapes federal tax, though. Interest on private activity bonds held in the fund counts when calculating the Alternative Minimum Tax. The fund reports that portion separately in Box 13 of Form 1099-DIV, and it carries over to Form 6251.¹¹ Most municipal money market funds hold little private activity bond debt, but check before assuming everything is fully exempt.

Government Money Market Funds

Government money market funds invest in Treasury bills and securities issued or guaranteed by federal agencies. Income from direct Treasury obligations is exempt from state and local income tax under federal law.¹² The income is still fully taxable at the federal level.

The state exemption is worth real money if you live in a high-tax state, but it only applies to the portion of fund income that comes from direct Treasury obligations. Agency securities and repurchase agreements backed by Treasuries do not always qualify. Fund administrators typically send a supplemental year-end statement showing the eligible percentage. Some states also require a minimum share of assets, often 50%, to be invested in U.S. government obligations before any pass-through exemption applies. Check your state’s rules before claiming it.

Inside a Retirement Account

If your money market fund sits inside an IRA, 401(k), or similar tax-advantaged account, none of the rules above apply while the money stays in the account. Distributions, dividends, and any gains accumulate without triggering current-year tax. What you pay later depends on the account type:

Traditional IRA or 401(k): earnings grow tax-deferred, and you pay ordinary income tax on the full amount when you withdraw it, regardless of whether the underlying earnings came from interest, dividends, or gains.
Roth IRA or Roth 401(k): earnings grow tax-free, and qualified withdrawals in retirement (generally after age 59½ and after the account has been open at least five years) owe no federal tax.

The ordinary-income character of money market fund payouts is essentially irrelevant inside these accounts. You won’t get a 1099-DIV each year, and nothing is reported until you take a distribution from the account itself.

How It Shows Up on Your Return

Your fund administrator sends Form 1099-DIV each year if your distributions total $10 or more. The important boxes:

Box 1a, Total Ordinary Dividends: your taxable distributions, including reinvested amounts. This goes on Line 3b of Form 1040.¹¹³
Box 12, Exempt-Interest Dividends: tax-exempt income from a municipal money market fund, reported on Line 2a of Form 1040.¹³
Box 13, Specified Private Activity Bond Interest Dividends: the portion of exempt-interest dividends that feeds into the AMT calculation on Form 6251.

If your total ordinary dividends across all accounts exceed $1,500 for the year, you also file Schedule B with Form 1040.¹⁴ The percentage of government fund income eligible for state tax exemption usually arrives in a separate year-end statement, not on the 1099-DIV, and you apply it yourself when filing your state return. Any capital gain or loss from selling shares at a price other than your cost basis goes on Form 8949 and carries to Schedule D.¹⁵ For most individual investors in stable-NAV retail funds, that form never gets touched for money market holdings.

1
Internal Revenue Service. Instructions for Form 1099-DIV
2
Office of Financial Research. Money Market Funds’ Floating NAVs Stay in Narrow Range for Now
3
Internal Revenue Service. Topic No. 404, Dividends and Other Corporate Distributions
4
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
5
Internal Revenue Service. About Form 1099-DIV, Dividends and Distributions
6
Internal Revenue Service. Topic No. 307, Backup Withholding
7
Internal Revenue Service. Topic No. 559, Net Investment Income Tax
8
Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
9
U.S. Securities and Exchange Commission. Money Market Fund Reforms
10
Office of the Law Revision Counsel. 26 U.S. Code 103 – Interest on State and Local Bonds
11
Internal Revenue Service. 2025 Instructions for Form 6251 – Alternative Minimum Tax – Individuals
12
Office of the Law Revision Counsel. 31 U.S.C. 3124 – Exemption From Taxation
13
Internal Revenue Service. Instructions for Form 1040
14
Internal Revenue Service. Schedule B (Form 1040) 2025
15
Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets