Portfolio interest exemption: How foreign investors can earn tax-exempt interest income from US sources
The portfolio interest exemption is a US tax provision under IRC sections 871(h) and 881(c) that allows qualifying foreign investors to receive interest income from US debt obligations completely free of the standard 30% withholding tax.
Without this exemption, every dollar of US-source interest paid to a foreign person would be subject to withholding at source. The exemption eliminates that liability entirely when all conditions are met.
The following three points summarize who benefits, what income qualifies, and why this matters for cross-border lending:
- Who benefits: Nonresident alien individuals, foreign corporations, foreign partnerships, and foreign trusts or estates that are not 10% shareholders of the US borrower
- What income qualifies: Interest paid on portfolio debt obligations issued in registered form – including US Treasury bonds, corporate bonds, and certain notes – that is not contingent on the borrower’s profits or revenues
- Why it matters: The exemption is the primary statutory mechanism for eliminating US withholding on exempt interest income, making it central to virtually every cross-border bond investment structure involving the United States
The legal framework: IRC sections 871(h) and 881(c) explained
IRC section 871(h) governs nonresident alien individuals while IRC section 881(c) governs foreign corporations – together they form the complete legal basis for the portfolio interest exemption.
Portfolio interest income that is exempt under the IRC must satisfy five core statutory conditions.
The first four conditions apply under both section 871(h) and section 881(c). The fifth, the CFC restriction, is specific to section 881(c): an individual cannot be a controlled foreign corporation, so it has no equivalent in 871(h). The bank recipient exclusion noted above is also specific to 881(c) for the same reason.
- The interest must be paid on a “portfolio debt obligation” that is not contingent on the borrower’s profits or revenues. Separately, if the recipient is itself a bank receiving interest on an extension of credit made in the ordinary course of its own lending business, that interest doesn’t qualify for the exemption under section 881(c)(3)(A) – this exclusion is about the lender’s status, not about whether a bank issued the debt.
- The debt obligation must be in registered form – bearer instruments do not qualify.
- The recipient must be a foreign person – not a US citizen, US resident, or domestic entity.
- The recipient must not be a 10% shareholder of the borrower – a threshold that disqualifies related-party lending from the exemption.
- The recipient must not be a controlled foreign corporation receiving interest from a related US person, under section 881(c)(3)(C).
These conditions apply simultaneously. Failing any one of them means the full 30% withholding rate applies.
US withholding agents must collect the correct withholding certificate forms before releasing any exemption.
See our TFX guide to international tax forms and foreign withholding forms for a broader overview of which forms apply in cross-border situations.
Who qualifies for the portfolio interest exemption?
US persons and US residents are categorically excluded – only foreign persons are eligible.
The following four categories of recipients can qualify:
- Nonresident alien individuals
- Foreign corporations
- Foreign partnerships – with eligibility determined at the partner level
- Foreign trusts and estates
Nonresident alien interest income that is effectively connected with a US trade or business is taxed under a different regime – graduated rates on net income under IRC section 871(b) – and does not qualify.
Portfolio interest exemption requirements: A qualification checklist
All five requirements below, plus the bank-recipient exclusion covered earlier, must be satisfied simultaneously – failing even one disqualifies the interest payment from the exemption.
The following five requirements apply under IRC sections 871(h) and 881(c):
- The interest must be from a “portfolio debt obligation.” Corporate bonds, Treasury securities, and promissory notes typically qualify. Bank deposits generally do not.
- The obligation must be in registered form. The identity of the owner must be recorded by the issuer or a transfer agent. Book-entry systems – the standard for virtually all modern US debt – satisfy this requirement.
- The recipient must be a foreign person. This includes nonresident alien individuals, foreign corporations, and other foreign entities. US citizens, resident aliens, and domestic entities are excluded regardless of where they live.
- The recipient must not be a 10% shareholder. A foreign person’s investment in a US borrower’s equity that reaches 10% or more of voting power or partnership capital/profits disqualifies the lender from claiming the exemption.
- The recipient must not be a controlled foreign corporation receiving interest from a related US person. This anti-abuse rule prevents offshore structures from stripping interest income from the US tax base.
The registered form requirement: why bearer instruments are prohibited
Bearer instruments are effectively barred from qualifying for the portfolio interest exemption for debt issued after March 18, 2012, under section 502 of the Hiring Incentives to Restore Employment (HIRE) Act of 2010, which repealed the earlier foreign-targeted bearer bond exception. IRS Notice 2012-20 provides the implementation guidance.
Bearer instruments – where physical possession alone proves ownership – offer anonymity that Congress eliminated as a prerequisite for the tax benefit. Foreign-targeted bearer bonds issued between July 18, 1984, and March 18, 2012, can still qualify if they meet the pre-2012 foreign-targeting requirements.
Registered form:
- Owner’s identity is recorded by the issuer or transfer agent
- Transfers occur through book-entry systems or endorsed certificates
- The IRS can trace ownership – the standard for all modern US Treasuries and most corporate debt
Bearer instruments:
- Physical possession equals ownership
- No identity record exists
- Transfers are anonymous – and ineligible for the exemption
The 10% shareholder rule and related party restrictions
If a foreign lender owns 10% or more of the voting power of the US borrower, the portfolio interest exemption is completely unavailable.
For US corporations, the test looks at voting stock. For US partnerships, the 10 percent shareholder test applies to capital or profits interests – 10% or more of either one triggers the disqualification.
Constructive ownership rules under IRC section 318 apply. Shares owned by family members, related entities, and through certain attribution chains count toward the threshold.
Based on a common TFX client scenario: A foreign investor holds a 12% profits interest in a US LLC taxed as a partnership. The investor also lends $500,000 to the LLC at 6% annual interest. Because the investor’s ownership exceeds 10%, the exemption does not apply. The LLC must withhold 30% on each interest payment – $9,000 per year on $30,000 of interest income – unless a treaty rate applies.
Controlled foreign corporation restriction
Even a CFC that would otherwise qualify as a foreign person is barred from the exemption when the interest is received from a related US person.
The following two conditions must both be present:
- The recipient is a CFC as defined under IRC section 957 – meaning more than 50% of its voting power or value is owned by US shareholders who each hold at least 10%
- The interest is paid by a related US person as defined under IRC section 864(d)(4) – generally a person related to the CFC under the section 267(b) ownership rules, or a US shareholder of the CFC (as defined in section 951(b)) together with persons related to that shareholder under section 267(b)
A controlled foreign corporation interest that fails this test is subject to full 30% withholding, even if all other portfolio interest exemption rules are met.
Contingent interest: A common disqualification
If the interest amount is tied to the borrower’s profits or revenues, it falls outside the portfolio interest exemption regardless of how the loan is structured.
Under IRC section 871(h)(4), the contingent interest disqualification applies when the interest payment is determined by reference to any of the following:
- The debtor’s receipts, sales, or cash flow
- The debtor’s income or profits
- Changes in the value of the debtor’s property
- Dividends, partnership distributions, or similar payments made by the debtor
Interest tied to a fixed rate, a qualified stated interest rate, or a standard floating rate index such as SOFR generally remains eligible.
FDAP income, withholding tax, and how the portfolio interest exemption fits in
Without the portfolio interest exemption, a foreign investor receiving $100,000 in US bond interest would owe $30,000 in withholding tax – the exemption reduces that liability to zero.
US source interest income is classified as Fixed, Determinable, Annual, or Periodical income – FDAP – and is subject to a 30% withholding tax on interest under IRC sections 1441 and 1442. This rate is the default and applies unless a specific statutory exemption or tax treaty reduces it.
The FDAP portfolio interest exemption is the primary domestic-law mechanism for eliminating this withholding. Unlike treaty-based relief, it does not require the investor to be a resident of a treaty country. A foreign investor from any jurisdiction can claim the exemption as long as the five requirements are met.
Foreign persons who receive US-source interest are issued Form 1042-S, not Form 1099-INT, which is used for reporting to US persons.
Receiving a Form 1099-INT instead usually means the payer doesn’t have a valid W-8BEN on file and should be asked to correct the reporting, per IRS guidance on NRA withholding.
Form W-8BEN and W-8BEN-E: Documentation requirements for claiming the exemption
The withholding agent – not the IRS – is responsible for collecting and verifying Form W-8BEN before releasing the portfolio interest exemption.
The following four steps outline the documentation process:
- A foreign individual completes Form W-8BEN. The form certifies foreign status, country of residence, and eligibility for the exemption. A US taxpayer identification number is not required to claim the portfolio interest exemption itself. It’s only required if the investor is separately claiming tax treaty benefits on the same form.
- A foreign entity completes Form W-8BEN-E. Corporations, partnerships, and other entities use this form to certify foreign status and claim treaty benefits in addition to the statutory exemption, if applicable.
- The form is delivered to the US withholding agent before the first payment. If the agent pays interest before receiving a valid W-8BEN, the agent must withhold 30%.
- The withholding agent retains the form and reports on Form 1042-S. The agent keeps the W-8BEN on file and issues Form 1042-S to the foreign recipient – even when the withholding rate is zero.
Form W-8BEN generally remains valid from the date of signing until the last day of the third succeeding calendar year. A form signed in 2025 remains valid through December 31, 2028. After expiration, the foreign investor must provide a new form or the withholding agent must revert to the 30% default rate.
Our TFX article on W-8BEN, W-9, and withholding forms walks through which form applies to each type of foreign payee.
Portfolio interest exemption and Form 1042: Reporting requirements for withholding agents
Even when the portfolio interest exemption reduces withholding to zero, the US payer must still file Form 1042 and issue Form 1042-S to document the exempt payment.
US withholding agents who pay portfolio interest to foreign persons must comply with the following:
- File Form 1042 annually. Form 1042 – Annual Withholding Tax Return for US Source Income of Foreign Persons – is due by March 15 of the year following payment. For tax year 2025, the deadline is March 16, 2026, because March 15 falls on a Sunday.
- Issue Form 1042-S to each foreign recipient. Form 1042-S reports the amount of interest paid, the exemption code applied, and the withholding rate.
- Retain W-8BEN documentation. The withholding agent must keep the foreign investor’s Form W-8BEN on file as proof that the exemption was properly claimed.
- A six-month extension is available. Filing Form 7004 by the original due date extends the Form 1042 deadline by six months. Withheld taxes, if any, must still be deposited on time.
Failure to file Form 1042 or issue Form 1042-S carries penalties even when no tax is owed.
Portfolio interest exemption for partnerships: Special considerations
When portfolio interest flows through a US partnership to foreign partners, the exemption is analyzed partner by partner – each qualifying foreign partner may be exempt from withholding on their allocable share.
US partnerships are flow-through entities. The exemption determination happens at the individual partner level, not at the partnership level.
The following key issues apply:
- Look-through analysis. Each foreign partner’s eligibility is evaluated separately. One partner may qualify while another does not.
- The 10% shareholder test is applied at the partner level. A foreign partner who owns 10% or more of the US borrower’s voting power or capital/profits interest – whether directly or through the partnership – is disqualified.
- IRC section 1446 withholding obligations. The partnership has a separate obligation under section 1446 to withhold on effectively connected taxable income allocable to foreign partners. Portfolio interest that is not ECI falls under a different analysis.
- Each partner must provide Form W-8BEN. The partnership collects W-8BEN forms from each foreign partner and determines the exemption eligibility individually.
Partnerships with foreign partners must make section 1446 withholding installment payments quarterly using Form 8813, then file the annual Form 8804 and issue each foreign partner a Form 8805 after year-end.
Portfolio interest exemption vs. tax treaty benefits: Which is better?
The US portfolio interest exemption can achieve a 0% withholding rate without any tax treaty – making it available to investors from countries that have no income tax treaty with the United States.
Foreign investors often have two paths to reducing US withholding on interest income: the exemption under domestic law, or a reduced rate under an applicable US income tax treaty. The right choice depends on the investor’s circumstances.
| Feature | Portfolio interest exemption | Tax treaty benefit |
|---|---|---|
| Withholding rate achieved | 0% | Varies by treaty – typically 0%, 5%, 10%, or 15% |
| Documentation required | Form W-8BEN or W-8BEN-E | Form W-8BEN or W-8BEN-E with treaty claim |
| Eligibility restrictions | Five statutory requirements, plus the bank-recipient exclusion, must be met | Must be a resident of a treaty country; limitation on benefits article may apply |
| Applicability to CFCs | Denied when CFC receives from related US person | Treaty benefits may still apply depending on LOB provisions |
| Treaty required? | No – available under domestic law | Yes – must have an applicable treaty in force |
| Interest type | Must be non-contingent interest on a portfolio debt obligation | Treaty may cover other interest not eligible for the exemption, such as a bank’s ordinary-course loan interest (bank deposit interest already has its own separate 0% exemption under section 871(i)(2)(A), with no treaty needed) |
The two paths are not mutually exclusive. A foreign investor may rely on the exemption for portfolio interest and claim treaty benefits for other interest not eligible for the exemption, such as a bank’s ordinary-course loan interest.
Bank deposit interest is different – it has its own separate 0% exemption under IRC section 871(i)(2)(A) regardless of treaty status.
Section 899 and the portfolio interest exemption: Recent legislative developments
Congress proposed Section 899 – “Enforcement of Remedies Against Unfair Foreign Taxes” – in 2025 as part of the One Big Beautiful Bill Act. It would have imposed escalating surtaxes on US-source income paid to persons from countries with “unfair foreign taxes,” including digital services taxes, diverted profits taxes, and the OECD’s Pillar 2 UTPR.
Both the House-passed version and the Senate Finance Committee’s draft addressed portfolio interest directly: committee materials from both chambers stated the surtax wasn’t meant to apply to income already excluded from FDAP withholding, and the Senate draft went further, expressly carving portfolio interest out of the rate increase.
The provision was dropped after Treasury Secretary Bessent reached a G-7 agreement in late June 2025. The final law, signed as P.L. 119-21 on July 4, 2025, does not include Section 899 – it is not current law.
Congressional leaders have signaled that Section 899 could be reintroduced if international tax planning negotiations over Pillar 2 break down. As of September 2026, no new Section 899 portfolio interest exemption legislation has been introduced.
Practical examples: When the portfolio interest exemption applies (and when it does not)
The most common reason TFX clients lose the portfolio interest exemption is the 10% shareholder rule – often triggered unintentionally when a foreign investor both owns equity in and lends to the same US entity.
The following four scenarios are based on common TFX client situations:
- German investor holding US Treasury bonds – exemption applies. A nonresident alien residing in Germany holds $2 million in US Treasury bonds in registered form. The investor has no equity in any US entity and provides a valid W-8BEN to the custodian. All five requirements are met. The interest is tax-exempt interest income – 0% withholding applies.
- Canadian investor owning 15% of a US LLC and lending to it – exemption denied. A Canadian individual owns 15% of a US LLC taxed as a partnership and also holds a $300,000 promissory note from the LLC paying 7% interest. Ownership exceeds 10%, so the exemption is unavailable. The LLC must withhold 30% on the $21,000 annual interest payment, unless the US-Canada treaty provides a lower rate.
- UK-based CFC receiving interest from its US parent – exemption denied. A UK corporation, wholly owned by a US parent, lends $5 million to the parent at 5% interest. The CFC restriction under IRC section 881(c)(3)(C) bars the exemption because the interest is paid by a related US person. Full 30% withholding applies.
- Singapore investor receiving profit-participation interest – exemption denied. A Singapore-based investor holds a note from a US real estate fund. The interest rate is tied to the fund’s net rental income – a form of contingent interest. IRC section 871(h)(4) disqualifies it. The 30% default withholding applies.
Portfolio interest exemption for US savings bonds and government obligations
US Treasury securities are among the most common instruments for claiming the exemption because they are always issued in registered form and are not subject to the contingent interest disqualification.
The following US government obligations generally qualify when held by eligible foreign persons:
- US Treasury bonds, notes, and bills
- Treasury Inflation-Protected Securities
- Savings bonds held by nonresident aliens in certain circumstances
The following instruments do not qualify:
- Bank deposit interest – separately exempt under IRC section 871(i)(2)(A), not under the portfolio interest exemption
- Interest on state and local government obligations – may be exempt under other provisions but analyzed separately
Whether US saving bond interest is taxable to a foreign holder depends on the holder’s status and the specific instrument.
How the portfolio interest exemption interacts with FIRPTA
The portfolio interest exemption and FIRPTA are distinct regimes, but certain loan structures can trigger both.
The FIRPTA exemption from withholding under IRC section 1445 and the portfolio interest exemption under sections 871(h) and 881(c) operate in separate domains. A foreign investor holding a standard US corporate bond faces only the portfolio interest analysis.
A foreign investor holding a participating mortgage on US real estate – where the “interest” includes a share of property appreciation – may face both the contingent interest disqualification and FIRPTA withholding simultaneously.
The foreign seller can recover over-withheld FIRPTA tax by filing Form 1040-NR, and the 15% rate may be reduced through a withholding certificate filed before closing.
Common mistakes that disqualify the portfolio interest exemption
The single most preventable mistake is failing to deliver Form W-8BEN to the withholding agent before the first interest payment – once withholding is applied, recovering it requires filing a US tax return.
The following six errors account for nearly all disqualifications TFX encounters in practice:
- Failing to provide Form W-8BEN before the first payment. The withholding agent cannot apply the exemption without documentation. 30% is withheld, and the foreign investor must file Form 1040-NR (individuals) or Form 1120-F (corporations) to claim a refund.
- Inadvertently crossing the 10% ownership threshold. Foreign investors who both own equity in and lend to the same US entity frequently trip this rule – sometimes through constructive ownership they did not know applied.
- Using contingent interest provisions in loan agreements. Revenue-participation features, equity kickers, and profit-sharing clauses can convert otherwise qualifying interest into non-qualifying contingent interest.
- Issuing debt in bearer form. While rare in modern practice, private placements and certain foreign-law instruments may still be structured as bearer debt.
- CFC receiving interest from a related US person. Intercompany lending between a US parent and its offshore subsidiary is one of the most common structures that fails the CFC restriction.
- Interest that is effectively connected with a US trade or business. If the foreign recipient’s lending activity rises to the level of a US trade or business, the interest becomes effectively connected income and is taxed at graduated rates.
See our TFX guide to foreign disregarded entities and Form 8858 for the reporting obligations that apply to these structures.
Portfolio interest exemption quick-reference summary table
Use this table as a pre-flight checklist before any cross-border lending transaction involving US source interest income.
| Requirement | Qualifies | Does not qualify |
|---|---|---|
| Recipient type | Nonresident alien individual, foreign corporation, foreign partnership, foreign trust/estate | US citizen, US resident alien, domestic corporation, domestic partnership |
| Instrument form | Registered form – book-entry or transfer-agent recorded | Bearer form – anonymous physical possession |
| Interest type | Fixed rate, qualified floating rate, standard stated interest | Contingent interest tied to borrower’s profits, revenues, or asset values |
| Ownership threshold | Less than 10% of borrower’s voting power or capital/profits interest | 10% or more – including constructive ownership |
| CFC status | Foreign corporation that is not a CFC receiving from a related US person | CFC receiving interest from a related US person |
| ECI status | Interest not effectively connected with a US trade or business | Interest that constitutes effectively connected income |
| Documentation | Valid Form W-8BEN or W-8BEN-E on file before payment | No W-8BEN on file – 30% withholding applies by default |
Frequently asked questions
It is a US tax rule under IRC sections 871(h) and 881(c) that lets qualifying foreign investors receive interest on US debt without the standard 30% withholding tax. If all five requirements are met, the withholding rate drops to zero.
Yes. US Treasury bonds, notes, and bills are always issued in registered form and pay non-contingent interest, making them among the most common instruments for claiming the exemption.
The withholding agent must apply the default 30% rate. To recover the over-withheld amount, an individual investor files Form 1040-NR; a foreign corporation files Form 1120-F instead. Either way, the refund process can take several months.
Yes, under IRC section 881(c). The key disqualification to watch is the CFC restriction – a controlled foreign corporation receiving interest from a related US person cannot claim the exemption.
Yes – 9% is below the 10% threshold. Verify your total direct and indirect ownership, because constructive ownership rules under IRC section 318 may attribute shares owned by family members or related entities.
Generally, no. IRC section 871(h)(4) excludes interest determined by reference to the borrower’s receipts, sales, income, profits, or changes in asset value. Interest tied to a fixed rate or a standard floating rate remains eligible.
They are separate paths to reducing withholding. The exemption is domestic law and requires no treaty. Some interest that doesn’t qualify for the portfolio interest exemption – interest paid to a bank on an ordinary-course loan, for example – may still get a reduced rate under a tax treaty. Bank deposit interest is different: it has its own separate 0% exemption under IRC section 871(i)(2)(A) regardless of treaty status, so no treaty claim is needed for it. You can rely on the portfolio interest exemption, the bank deposit interest exemption, and treaty relief for different income streams from the same payer.
Portfolio interest is US-source FDAP income from debt obligations, subject to 30% flat withholding unless the exemption applies. Effectively connected income is income connected with a US trade or business, taxed at graduated rates on net income. The same interest payment cannot be both.
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