Subchapter M of the Internal Revenue Code is the set of tax rules that lets qualifying mutual funds, ETFs, closed-end funds, and real estate investment trusts avoid paying corporate income tax on the money they pass through to investors. In exchange for distributing nearly all of their income to shareholders each year, these funds get to deduct those distributions and effectively zero out their entity-level tax bill. The 21% corporate tax that would otherwise apply lands only on the shareholder, once, at the shareholder’s own rate.
The structure is what makes pooled investing workable. Without it, a dollar earned inside a mutual fund would be taxed at the fund level and then again when it reached you, shrinking returns dramatically. Subchapter M keeps that from happening, but only for funds that meet a demanding list of yearly tests.
Which Funds Fall Under Subchapter M
Two main types of entities use Subchapter M. Regulated Investment Companies (RICs) are domestic corporations registered under the Investment Company Act of 1940.1Office of the Law Revision Counsel. 26 USC 851 – Definition of Regulated Investment Company In practice, that covers the mutual funds, exchange-traded funds, and closed-end funds most individual investors own, along with business development companies that elect the same treatment.
Real Estate Investment Trusts (REITs) are the other main category. A REIT is a corporation, trust, or association that would otherwise be taxed as a domestic corporation but elects REIT status and meets a separate set of rules tied to real estate.2Office of the Law Revision Counsel. 26 USC 856 – Definition of Real Estate Investment Trust REITs hold portfolios of income-producing property or mortgage-backed assets and route the rent, interest, and gains to shareholders.
A third structure, the Real Estate Mortgage Investment Conduit (REMIC), also sits inside Subchapter M but operates under its own rules for pools of mortgage loans.3Office of the Law Revision Counsel. 26 USC 860D – REMIC Defined Most retail investors won’t encounter REMICs directly.
What a Fund Must Do to Qualify
Qualification is not a one-time filing. A fund has to meet the tests every year, and stray income or a poorly timed asset purchase can put its status at risk.
The RIC Income and Asset Tests
At least 90% of a RIC’s gross income each year must come from dividends, interest, gains on stocks or securities, and similar investment sources, including income from qualified publicly traded partnerships.1Office of the Law Revision Counsel. 26 USC 851 – Definition of Regulated Investment Company Revenue from anything outside that list, like running an operating business on the side, cannot exceed 10% of gross income.
The asset test runs at the close of each quarter. At least half of total assets must sit in cash, government securities, RIC shares, or diversified positions where no single issuer exceeds 5% of total assets and the fund doesn’t own more than 10% of any issuer’s voting stock. No more than 25% of assets can be concentrated in any one issuer, or in two or more controlled issuers in related businesses.1Office of the Law Revision Counsel. 26 USC 851 – Definition of Regulated Investment Company A fund that drifts out of compliance right after a purchase gets 30 days to fix things, and deeper problems have a six-month cure window if the failure was for reasonable cause rather than willful neglect.
The REIT Tests
REITs face a layered version of the same idea. Two income tests apply each year: at least 75% of gross income must come from real-estate sources like rents, mortgage interest, and gains on real property sales, and at least 95% must come from those sources plus other passive investment income.2Office of the Law Revision Counsel. 26 USC 856 – Definition of Real Estate Investment Trust At quarter-end, at least 75% of assets must be real estate assets, cash, or government securities, with concentration limits on the non-real-estate portion.
REITs also carry ownership rules. Starting in the second tax year, a REIT must have at least 100 beneficial owners, and five or fewer individuals cannot own more than half of the shares during the last six months of the year.2Office of the Law Revision Counsel. 26 USC 856 – Definition of Real Estate Investment Trust These rules keep REITs functioning as broad-based investment vehicles.
The 90% Distribution Rule
The distribution requirement is what makes the whole pass-through structure work. A RIC must distribute at least 90% of its investment company taxable income and 90% of its net tax-exempt interest each year.4Office of the Law Revision Counsel. 26 USC 852 – Taxation of Regulated Investment Companies and Their Shareholders A REIT faces the same 90% threshold, applied to its REIT taxable income before the dividends-paid deduction and excluding net capital gains.5Office of the Law Revision Counsel. 26 USC 857 – Taxation of Real Estate Investment Trusts and Their Shareholders
Every dollar distributed generates a dividends-paid deduction. A fund earning $10 million that distributes $9.5 million deducts the full $9.5 million, leaving just $500,000 exposed to entity-level tax. Distribute the whole amount and the fund’s tax bill drops to essentially zero. The government still gets its revenue, but from the shareholders who receive the distributions.
Because taxable income often isn’t final until after year-end, both RICs and REITs can declare a “spillover” dividend after the close of the tax year and have it treated as paid in the prior year, provided the distribution actually goes out within 12 months of year-end.6Office of the Law Revision Counsel. 26 USC 855 – Dividends Paid by Regulated Investment Company After Close of Taxable Year7Office of the Law Revision Counsel. 26 USC 858 – Dividends Paid by Real Estate Investment Trust After Close of Taxable Year Shareholders generally report the payment in the year they actually receive it, even though the fund treats it as prior-year.
Why Funds Distribute More Than 90%
Meeting the 90% threshold keeps the fund’s status, but it doesn’t avoid every tax. A separate 4% excise tax applies to income the fund holds back beyond what Congress considers acceptable.
For RICs, the required distribution for excise-tax purposes is 98% of ordinary income for the calendar year plus 98.2% of capital gain net income for the one-year period ending October 31, with any prior-year shortfall carried forward.8Office of the Law Revision Counsel. 26 USC 4982 – Excise Tax on Undistributed Income of Regulated Investment Companies For REITs, the thresholds are 85% of ordinary income and 95% of capital gain net income, again with a 4% tax on any shortfall.9Office of the Law Revision Counsel. 26 USC 4981 – Excise Tax on Undistributed Income of Real Estate Investment Trusts
That is why in practice you often see funds distributing well above the 90% floor. Holding back more than a small buffer triggers the 4% penalty on top of what shareholders will owe anyway.
What This Means for Your Tax Return
Because the fund itself pays little or no tax, the full tax burden lands on shareholders. Each year the fund sends a Form 1099-DIV showing distributions broken into ordinary dividends, qualified dividends, and capital gain distributions.10Internal Revenue Service. Instructions for Form 1099-DIV
Income Keeps Its Character
One of the most useful features of Subchapter M is that income doesn’t change type as it moves through the fund. A long-term capital gain earned by the fund stays a long-term capital gain in your hands. That matters, because long-term gains are taxed at preferential rates of 0%, 15%, or 20% depending on your total taxable income.11Internal Revenue Service. Topic No. 409, Capital Gains and Losses For 2026, single filers owe no capital gains tax on those distributions until taxable income exceeds $49,450, with the 20% rate starting above $545,500.
Without character preservation, the fund would pay 21% at the corporate level first, and you would pay again on what was left.12Internal Revenue Service. Publication 542, Corporations The whole appeal of holding investments through a fund would collapse.
The 3.8% Surtax on Higher Incomes
Higher-income shareholders owe an additional 3.8% net investment income tax on top of regular dividend and capital gains rates. It applies to the lesser of your net investment income or the amount by which your modified adjusted gross income exceeds $200,000 for single filers, $250,000 for joint filers, or $125,000 for married individuals filing separately.13Internal Revenue Service. Topic No. 559, Net Investment Income Tax Dividends and capital gain distributions from RICs and REITs all count as net investment income.
What Happens If a Fund Loses Its Status
The stakes for the fund are severe. A RIC or REIT that fails qualification is taxed as an ordinary C corporation. Every dollar of net income gets hit with the 21% corporate rate, and the dividends-paid deduction goes away.12Internal Revenue Service. Publication 542, Corporations Shareholders still owe tax on whatever comes out, so the double taxation Subchapter M was designed to prevent returns in full.
A fund in that position typically faces heavy redemptions and often liquidates. Getting the status back is difficult: a RIC must either have qualified as a RIC for every tax year ending after November 7, 1983, or have no accumulated earnings and profits from any non-RIC year.1Office of the Law Revision Counsel. 26 USC 851 – Definition of Regulated Investment Company REITs face a parallel rule under Section 857.5Office of the Law Revision Counsel. 26 USC 857 – Taxation of Real Estate Investment Trusts and Their Shareholders Either the accumulated earnings must be purged, or the fund has to trace its election history back decades.
For investors, the practical upshot is that Subchapter M compliance is not just a technicality. It’s the reason your fund distributions arrive taxed once instead of twice, and it’s why fund managers guard the qualification tests as carefully as they do.