How to Structure an ECI Blocker for Non-US LPs

An ECI blocker for non-U.S. LPs is usually structured by placing a corporation, or an entity treated as a corporation for U.S. federal income tax purposes, between tax-sensitive non-U.S. limited partners and a U.S. pass-through investment that generates effectively connected income (ECI). ECI is income connected with the conduct of a U.S. trade or business. The blocker absorbs that income, pays corporate tax on it, and sends after-tax cash to the LPs as a distribution rather than as an allocation of business income.

That protection solves the LP’s filing problem, but it does not eliminate the tax. Non-U.S. investors avoid ECI because it can trigger U.S. tax return filing obligations, direct tax liability and additional compliance burdens. The blocker removes the direct exposure, while relocating the tax to a corporate vehicle whose leakage is borne by the investors in that sleeve and whose existence can constrain the fund’s exit options.

Structure selection by fact pattern

Step 1: Identify the ECI-producing activity

Diagnose the asset before the investor. The blocker question follows from what the fund holds and does, because the same LP base can require different structuring across corporate stock, operating partnerships, credit assets and real estate.

• Interests in U.S. operating partnerships or LLCs engaged in a U.S. business.
• Primary loan origination, where the lending activity itself may constitute a U.S. trade or business.
• U.S. real property interests, since FIRPTA treats gains on those interests as a special category of ECI.
• U.S. trade-or-business exposure created through agents or on-the-ground activity.

Whether a foreign taxpayer is engaged in a U.S. trade or business is fact-intensive. The trading safe harbour can keep securities trading outside U.S. trade-or-business treatment, but it depends on the activity, dealer status and the instruments involved. Do not assume it covers an origination-heavy credit strategy, particularly in direct lending where primary loan activity may look different from secondary trading.

Stock in a U.S. C corporation sits at the other end of the spectrum. Capital gain on the sale of corporate stock does not carry the same flow-through ECI problem, which is why direct funds investing in corporate targets historically avoided this architecture.

Step 2: Segment the LP base before sizing the blocker

Non-U.S. LPs, U.S. tax-exempt investors and Section 892 foreign government investors may all dislike flow-through U.S. business income, but they are not one constituency. Treaty status changes the withholding maths on distributions. Sovereign investors have their own exemption profile, while tax-exempts care about unrelated business taxable income (UBTI), which a blocker can also address, although their sensitivity to leakage may differ.

U.S. taxable LPs are the group most often harmed by lazy structuring. Put them behind the same blocker and they pay a corporate-level tax they never needed, then may face tax again on the distribution. Sponsors also use a splitter partnership below the blocker so that sponsor capital and carried interest do not suffer unnecessary blocker leakage. That allocation decision should sit alongside the broader division of economics between limited partners and general partners.

Step 3: Place the blocker where it does the least damage

Placement determines who pays for the protection. A blocker that sits too high in the structure can capture clean income that never needed blocking, while a blocker that sits too low may fail to accommodate all sensitive investors efficiently.

• Feeder blocker: sensitive investors commit through a corporate feeder into the main fund. This can be clean for fundraising, but every investment the fund makes runs through it, including those that never produce ECI.
• Below-the-fund blocker: formed beneath the fund for a specific investment or class of investments. Investors who do not need blocking can hold that asset directly.
• Investment-specific blocker: the common private equity pattern for a single pass-through portfolio company, and the easiest to sell separately later.
• Credit fund split: primary loans are originated through a U.S. blocker while the fund holds seasoned secondary loans directly. More advanced structures pair a U.S. blocker with a foreign reverse hybrid and specially allocate ECI to the blocker.

These placement choices also affect fundraising documents and side-letter negotiations. Sponsors raising from a broad international base should align the blocker election mechanics with the commitments process, rather than trying to redesign the structure after closing. That is a fundraising issue as much as a tax issue, particularly where anchor LPs require ECI protection as a condition to committing to the fund.

Step 4: Choose between a U.S. blocker and a foreign blocker

For assets producing U.S. ECI, a U.S. blocker is the usual answer. A U.S. blocker is taxed at 21% on worldwide income, with state tax and possibly non-U.S. tax on top. Historical industry practice for U.S. flow-through portfolio companies was to use a U.S. entity, either a corporation or an entity electing corporate treatment.

A foreign blocker is more suited to portfolios that are primarily non-U.S. Used against U.S. trade-or-business income, it can be expensive. A 2023 practitioner analysis puts the arithmetic at 30% on relevant U.S.-source passive gross income or 21% on ECI, with branch profits tax on top of the ECI charge, producing a 44.7% effective federal rate absent treaty relief. Treaty position is therefore the variable that decides whether the number is tolerable.

Do not rely on the shorthand that a Cayman entity neutralises the problem. A foreign corporation investing directly in a U.S. operating partnership can face branch profits tax itself, which is one reason a domestic blocker may be inserted in the first place.

Step 5: Model leakage as a deal cost

Blocker tax belongs in the deal model alongside fees, financing costs and exit assumptions. Run the blocked and unblocked cases side by side for the non-U.S. sleeve, and treat the result as part of the investment underwriting rather than as a technical footnote.

• Federal corporate tax at 21%, plus applicable state and local tax.
• Withholding on dividends from the blocker, adjusted for treaty position.
• Branch profits tax where a foreign blocker holds ECI-producing assets.
• Formation, annual returns and ongoing maintenance costs for each blocker entity.
• Any purchase price discount a buyer demands on a blocker stock sale.

That leakage should be compared with the unblocked cost, including LP-level U.S. filings, partnership-level withholding, ECI tax and the fundraising friction of asking a sovereign wealth fund to file a U.S. return. For a smaller vehicle with one marginal ECI-producing asset, direct filing can be cheaper than building and maintaining a blocker. The comparison should be visible in the same financial modelling package used for the investment committee case.

Step 6: Put the mechanics in the documents

ECI covenants were the older solution. They protected tax-sensitive investors but restricted what the fund could buy, which is a large part of why blockers gained ground as the more flexible tool. Sponsors resist hard ECI caps for that reason and prefer commercially reasonable efforts language paired with authority to form blockers when needed.

The partnership agreement and side letters should cover blocker formation authority, LP election into a blocked sleeve, allocation of blocker taxes and expenses to the investors who benefit, tax distribution mechanics and exit cooperation obligations. Investor onboarding should capture treaty and withholding status at subscription, not during a sale process. Those mechanics belong in the same documentary control set as the broader fundraise, subscription process and private equity fundraising negotiations.

Step 7: Decide the exit route before signing the acquisition

Two exits produce very different outcomes. If the blocker sells the underlying LLC interest, the gain is taxed at the blocker before anything reaches LPs. If the fund sells blocker stock, that corporate-level charge on the asset gain can often be avoided.

The buyer understands the trade. Buying blocker stock means no tax basis step-up in the underlying flow-through interest, so buyers routinely seek a purchase price reduction to compensate. That discount is the economic cost of the preferred exit, and it should sit in the underwriting model from entry, not appear in the final round of price negotiation.

For that reason, blocker planning should be coordinated with the sponsor’s broader private equity exit strategy. In real estate-heavy portfolios, FIRPTA and U.S. real property holding company analysis can further affect sale mechanics, making the blocker question inseparable from the real estate private equity exit plan.

Worked example: operating LLC through a blocker sleeve

Assume a private equity fund with U.S. taxable LPs and non-U.S. LPs acquires a U.S. operating LLC taxed as a partnership. The LLC’s income is ECI for anyone holding through a pass-through chain.

1. The sponsor forms a U.S. blocker below the fund for the non-U.S. LP sleeve.
2. Non-U.S. LPs fund their share of the equity through the blocker. U.S. taxable LPs invest on an unblocked path and take their allocation directly.
3. The blocker receives its allocation of LLC income, pays 21% federal tax plus state tax, and distributes after-tax cash, with withholding applied according to each LP’s treaty position.
4. At exit, the sponsor markets blocker stock rather than having the blocker sell the LLC interest, and models a price concession for the buyer’s lost step-up.
5. If the buyer refuses the blocker, the asset sale case runs with full blocker-level tax on the gain, and the sponsor compares net proceeds under both paths.

Common structuring failures

• Classifying the target late. Discovering that the portfolio company is an LLC after signing leaves no clean way to insert a blocker.
• Blocking everybody. U.S. taxable LPs pay for protection they do not need.
• Assuming an offshore entity solves ECI. Branch profits tax and the 30% gross-basis charge can make the structure worse.
• Treating the trading safe harbour as automatic for a credit strategy that originates loans.
• Never revisiting the structure. Blockers should be reviewed against the current investor base and asset mix before refinancings, add-ons and exit preparation.

Conclusion

The blocker is a capital-raising and risk-allocation device. It buys LP marketability and removes filing exposure, and it charges the fund corporate tax, entity maintenance and a probable exit discount for that service.

Use it where the ECI exposure is real, size it to the investors who need it, and price the leakage at underwriting. Get the exit assumption wrong and the discount surfaces during exclusivity, when there is no time left to restructure and no leverage left to argue about price.

P.S. If fund structuring and cross-border deal work are part of your world, check out our Premium Resources for fund models, transaction decks and more tools to help you advance your career.

Sources

• Tax Structuring for Non-US Investors – Fundamentals
• Thinking Through the Tax-Blocker Endgame
• ‘Blocker’ corporations: Considerations for investment fund managers
• The Implications of the Force of Attraction Rule for Certain Credit Funds
• Considerations for Investment Fund Managers When Using Blocker Entities
• New Court Decision May Affect PE Fund Blocker Corporation Structures