Qualified interest income is the slice of a U.S. mutual fund’s or ETF’s distributions that a foreign investor can receive free of the standard 30% federal withholding tax. It exists because the underlying interest — bank deposits, Treasury bills, most registered corporate bonds — would already be tax-free if the foreign investor held the debt directly. Internal Revenue Code Section 871(k) lets a regulated investment company pass that treatment through by designating the eligible portion of its payout as an “interest-related dividend.”1Office of the Law Revision Counsel. 26 USC 871 – Tax on Nonresident Alien Individuals – Section: (k) Exemption for Certain Dividends of Regulated Investment Companies
The exemption is not automatic. The fund has to identify and report the qualifying amount, and you have to have the right paperwork on file with the withholding agent. Miss either piece and 30% comes off the top.
What Counts as Qualified Interest Income
The statute defines it as the sum of four categories of U.S.-source income earned by the fund. Foreign-source interest the fund happens to earn does not count.
- Short-term original issue discount on debt maturing in 183 days or less from issuance. Treasury bills and commercial paper are the typical examples.
- Interest on registered obligations — bonds and notes issued in registered form, including U.S. Treasury securities and most corporate bonds, as long as the fund does not own 10% or more of the issuer’s voting stock or partnership interest.
- Interest on deposits at U.S. banks, savings and loan associations, credit unions, and insurance companies, provided the income is not tied to a U.S. business the fund operates.
- Interest-related dividends the fund receives from another regulated investment company. Those pass through and keep their character.
What Is Excluded
Several categories of interest look eligible but are specifically carved out. If a distribution falls into one of these, it stays taxable at up to 30%.
Contingent Interest
Interest whose amount depends on the borrower’s revenue, profits, property value, or dividend payments does not qualify for the portfolio interest exemption that feeds into QII. A reduced treaty rate may still apply, but the automatic 0% does not.2IRS.gov. Portfolio Debt Exemption – Requirements and Exceptions
Ten-Percent Shareholders
If you own 10% or more of the voting stock of a corporation, or 10% or more of the capital or profits interest in a partnership, that issued debt held by the fund, the portion of the interest-related dividend attributable to that debt is not exempt for you. Constructive ownership rules can push you over the threshold through shares held by family members or related entities.3Office of the Law Revision Counsel. 26 USC 871 – Tax on Nonresident Alien Individuals – Section: (k)(1)(B) Exceptions
Effectively Connected Income
Interest that is effectively connected with a U.S. trade or business you conduct falls outside the exemption. That income is taxed under a separate framework at graduated rates, with deductions allowed, rather than the flat 30% that applies to passive income.4Internal Revenue Service. Effectively Connected Income (ECI)
Sanctioned Countries
The exemption does not apply to dividends paid to persons within a foreign country during any period the Secretary of the Treasury has determined that tax information exchange with that country is inadequate.5Office of the Law Revision Counsel. 26 USC 871 – Tax on Nonresident Alien Individuals – Section: (k)(1)(B)(iii)
How the Fund Designates the Amount
The fund, not the investor, decides how much of a distribution counts as an interest-related dividend. It calculates its qualified net interest income — total qualified interest income minus the deductions properly allocable to that income — and reports the interest-related portion in written statements to shareholders.6Office of the Law Revision Counsel. 26 USC 871 – Tax on Nonresident Alien Individuals – Section: (k)(1)(C) Interest-Related Dividend
There is a cap. If a fund reports more in interest-related dividends than its actual qualified net interest income for the year, each shareholder’s designated amount is proportionally reduced. A fund cannot inflate the exempt portion beyond what the underlying income supports.
Foreign shareholders receive the designation through the fund’s withholding agent, which uses it to set the correct rate at the time of payment.
The Paperwork You Need on File
No documentation, no exemption. Before the withholding agent applies the 0% rate, you need a valid Form W-8BEN (for individuals) or Form W-8BEN-E (for entities such as foreign corporations or trusts) on file.7Internal Revenue Service. About Form W-8 BEN, Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting (Individuals) The form certifies you are not a U.S. person and that you are the beneficial owner of the income. Your broker, bank, or fund manager keeps it in their records rather than sending it to the IRS.
You provide your legal name, permanent residence address, and the foreign tax identification number issued by your home country. If your country has an income tax treaty with the United States you may also complete the treaty benefits section, though the QII exemption itself is statutory and does not depend on any treaty.8Internal Revenue Service. Instructions for Form W-8BEN
When It Expires
A W-8BEN generally stays valid from the date you sign it through the last day of the third calendar year that follows. A form signed at any point in 2026 expires on December 31, 2029. If it lapses without a replacement, the withholding agent must apply the full 30% rate on all distributions, including the interest-related portion, until a new form is on file.9Internal Revenue Service. Instructions for Form W-8BEN
If your circumstances change before the form expires — you move to a different country, change your name, or your tax ID number changes — you must notify the withholding agent within 30 days and file a new form. Outdated information can trigger the maximum withholding rate even before the normal expiration date.
Timing
File the W-8BEN when you open the account or before any distribution is scheduled. If the form is not on file at the time of payment, the agent withholds 30% by law.7Internal Revenue Service. About Form W-8 BEN, Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting (Individuals) Once processed, the 0% rate applies automatically to qualifying distributions in each payment cycle.
How It Appears on Form 1042-S
Even when no tax is withheld, the withholding agent must file Form 1042-S to report amounts paid to you. Interest-related dividends are reported using income code 01, with exemption code 02 in Box 3a to indicate the distribution is exempt under the Internal Revenue Code. The agent must file the form with the IRS and furnish copies to you by March 15 of the year following payment.10Internal Revenue Service. 2026 Instructions for Form 1042-S – Foreign Person’s U.S. Source Income Subject to Withholding
Keep every 1042-S you receive. It is the primary document you will need if you ever have to prove the income was properly exempt or claim a refund for overwithholding.
Recovering Tax Withheld by Mistake
If the agent applied the 30% rate to income that should have been exempt — because your W-8BEN had lapsed, was filled out incorrectly, or was not on file in time — you can claim a refund by filing Form 1040-NR. Attach the Form 1042-S showing the income and the amount withheld. If the interest was treaty-exempt or QII-exempt and your only U.S. tax liability was fully satisfied by withholding, you can use the simplified refund procedure rather than completing a full return.11Internal Revenue Service. Instructions for Form 1040-NR
The process takes time. The IRS advises allowing up to six months for refunds tied to amounts reported on Form 1042-S. For a refund of tax withheld from portfolio interest specifically, you will also need details about the underlying debt obligation, including the issuer name, interest rate, and CUSIP number if one exists.
A Companion Exemption for Short-Term Capital Gains
Section 871(k) contains a parallel rule that is easy to miss. Short-term capital gain dividends paid by a regulated investment company are also exempt from the 30% withholding tax for foreign investors. The mechanics mirror the QII exemption: the fund designates the short-term capital gain portion in its written statements, and the same documentation rules apply.12Office of the Law Revision Counsel. 26 USC 871 – Tax on Nonresident Alien Individuals – Section: (k)(2) Short-Term Capital Gain Dividends
The same exceptions apply. Ten-percent shareholder status, effectively connected income, and location in a sanctioned country each shut the exemption off. When reviewing fund distributions, look for both designations to see the full scope of what you can receive tax-free.