The portfolio interest exemption exempts qualifying U.S.-source interest paid to foreign lenders from the standard 30% U.S. withholding tax. Eligibility requires registered debt, the foreign lender to be unrelated to the borrower (ownership tests), and proper IRS Form W-8BEN or W-8BEN-E documentation.
Portfolio interest exemption mechanics for foreign-funded CRE deals
FIRPTA, REIT, and treaty mechanics are highly fact-specific and change with new IRS guidance. This page is sponsor-POV process commentary, not tax or legal advice. Engage U.S. tax counsel and the foreign investor's home-country tax advisor before structuring any cross-border CRE transaction.
Statutory framework: §871(h) and §881(c) exempt 'portfolio interest' paid to qualifying foreign persons from the standard 30% U.S. withholding tax. The exemption was designed to manage foreign investment in U.S. capital markets and applies to most ordinary debt instruments.
Key eligibility tests: (a) the debt must be in registered form (not bearer); (b) the foreign holder must be unrelated to the borrower (no 10%-or-greater equity ownership in the borrower); (c) the foreign holder must be neither a bank receiving the interest in the ordinary course of its lending business nor a CFC of which the borrower is a related shareholder; and (d) proper W-8 documentation must be on file.
10% related-party test: the foreign lender cannot own (directly, indirectly, or constructively) 10% or more of the voting interests in a corporate borrower or 10% or more of the capital or profits interest in a partnership borrower. This test is the most-common reason foreign-investor-affiliated debt fails the exemption.
Practical CRE application: when foreign capital invests in CRE via a debt instrument (third-party loan, mezz debt to an unrelated borrower, syndicated participation), the portfolio interest exemption typically applies and zeros out U.S. withholding on the interest. When the foreign lender is also an equity investor in the borrower (common in foreign-LP-driven deals), the related-party test usually fails and standard 30% withholding (or a treaty-reduced rate) applies.
Documentation: the foreign lender provides a Form W-8BEN (individual) or W-8BEN-E (entity) certifying eligibility for the exemption. The borrower retains the W-8 in case of IRS examination. Update the W-8 every three years or earlier if circumstances change.
Sources
- United States Income Tax Treaties: A to Z · U.S. Internal Revenue Service · current
- Effectively Connected Income (ECI) of Foreign Persons · U.S. Internal Revenue Service · current