Anatomy of a U.S. Blocker Corporation

A U.S. blocker is a corporation you insert into a structure for one reason: to stop a U.S. tax attribute from reaching the people above it. It is a good tool and a widely used one. It is also frequently sold as a way of avoiding U.S. tax, which it is not. It substitutes one exposure for another, and the whole question is whether the substitution is favorable on your facts.

The problem it exists to solve

Begin with what happens without one.

A foreign person who holds an interest in a U.S. partnership or LLC that carries on a trade or business in the United States is not merely an investor in that business. Under IRC §875, the partner is treated as engaged in the trade or business the partnership conducts. The income allocated to that partner is effectively connected income, taxed on a net basis at graduated rates under IRC §871(b) for an individual or under IRC §882(a) for a foreign corporation.

Three consequences follow, and each of them is the reason someone eventually proposes a blocker.

• The partnership must withhold under IRC §1446(a) on the effectively connected taxable income allocable to the foreign partner, at the highest rate under IRC §1 for a noncorporate partner and the IRC §11(b) rate of 21 percent for a corporate one, reported on Forms 8804, 8805, and 8813.
• The foreign partner acquires a personal U.S. filing obligation, on Form 1040-NR or Form 1120-F, in every year the structure produces effectively connected income.
• Under IRC §864(c)(3), U.S. source income of a taxpayer engaged in a U.S. trade or business that is not otherwise tested is treated as effectively connected, which widens the exposure beyond the specific activity that created it.

For a fund with foreign limited partners, or a family office that will not accept a U.S. return in the principal's own name, those consequences are disqualifying rather than merely inconvenient.

What sits where

The structure is simple, and its simplicity is the point.

At the bottom sits the operating business, typically a pass-through: an LLC or a limited partnership carrying on the activity. Above it sits the blocker, a corporation. In the classic U.S. blocker, that corporation is domestic, formed in Delaware or another U.S. state, and taxed as a C corporation. Above the blocker sit the foreign investors or the foreign parent, holding stock.

The blocker holds the equity in the operating pass-through. The investors hold equity in the blocker and nothing else. That single interposition is the entire mechanism. Everything that follows is a consequence of the investors owning stock in a corporation rather than an interest in a partnership.

Blockers also appear in offshore form, most often to shield tax-exempt U.S. investors from unrelated business taxable income rather than to shield foreign investors from effectively connected income. Different problem, different placement. This article is about the U.S. blocker.

What the blocker actually blocks

Be exact about this, because the imprecision is where expectations go wrong.

The blocker blocks attribution. Because the shareholders hold stock rather than a partnership interest, IRC §875 does not reach them. They are not treated as engaged in the U.S. trade or business, and their income from the structure is a dividend: fixed or determinable annual or periodical income, not effectively connected income.

The practical relief follows. No IRC §1446(a) withholding at the investor level, because no effectively connected taxable income is allocated to a foreign partner. No Form 1040-NR or Form 1120-F for the investor arising from this structure. The force of attraction rule of IRC §864(c)(3) does not reach up. The investors' contact with the U.S. tax system reduces to dividends, and possibly gain on the stock.

What it does not block

It does not block the tax. It relocates the tax to the corporation and adds a second charge on the way out. That trade is the subject of the next two sections.

Beyond that, three things pass through a blocker untouched.

State tax. A blocker is a federal answer to a federal problem. State corporate income tax and state filing obligations follow the operating business wherever it has nexus, and after South Dakota v. Wayfair, Inc. (2018) sales and use tax registration thresholds follow customers rather than physical presence.

FIRPTA. If the structure holds U.S. real property, the blocker may itself be a U.S. real property holding corporation under IRC §897(c)(2). Stock in such a corporation is a U.S. real property interest, so a sale of the blocker's own stock by a foreign shareholder falls inside FIRPTA, with withholding at 15 percent of the amount realized under IRC §1445, reporting on Forms 8288 and 8288-A, and a withholding certificate available on Form 8288-B. In a real-estate structure the blocker does not remove the exit charge; it moves where it lands.

History. A blocker carries its own tax attributes and compliance record, and a buyer acquiring it acquires both. The filing history becomes a diligence subject.

The two federal layers

The first layer is ordinary corporate tax. A domestic blocker files Form 1120 and pays 21 percent on taxable income under IRC §11(b). A foreign corporation used as the blocker is instead taxed under IRC §882(a)(1), which applies the rates of IRC §11, §55, and §59A to its effectively connected income, and IRC §882(c)(2) conditions its deductions and credits on filing a true and accurate return.

The second layer is the one most often skipped in summaries. IRC §884(a) imposes a branch profits tax of 30 percent of the dividend equivalent amount on a foreign corporation with effectively connected earnings. Under IRC §884(b), that amount is the effectively connected earnings and profits, reduced by an increase in the corporation's U.S. net equity and increased by a decrease in it, so that earnings reinvested in the U.S. business are not immediately charged while earnings withdrawn from it are. IRC §884(f) adds a branch-level interest tax, and IRC §884(e) conditions treaty relief on the foreign corporation being a qualified resident.

A domestic blocker is not a foreign corporation, so IRC §884 does not apply to it. That is the specific reason a U.S. blocker is often preferred to having a foreign parent operate the U.S. business directly. The branch profits tax is replaced by dividend withholding: a different regime, with different treaty relief and different timing.

Getting money out, and where the treaty article does the work

A dividend from a domestic corporation is U.S. source income under IRC §861(a)(2)(A). Paid to a foreign shareholder, it is subject to 30 percent tax under IRC §881(a) for a foreign corporation or IRC §871(a) for an individual, collected by withholding under IRC §§1441–1442 and reported by the withholding agent on Forms 1042 and 1042-S.

Treaty relief decides whether the structure is efficient, and it is entirely documentation-dependent. Many U.S. treaties reduce the dividend rate, typically with a lower rate for direct holdings above a stated ownership percentage and a higher one for portfolio holdings. Access requires the shareholder to satisfy the treaty's limitation on benefits article and to deliver a valid Form W-8BEN-E, treaty claim completed in Part III, before payment. That form is generally valid from the date signed through the last day of the third succeeding calendar year.

An illustrative sequence, using round numbers: a blocker with $1,000,000 of taxable income pays $210,000 at 21 percent under IRC §11(b), leaving $790,000. Distributed with no treaty reduction available, withholding at 30 percent would be $237,000. If the applicable treaty article and the shareholder's limitation on benefits position supported a 5 percent rate on a qualifying direct holding, withholding on the same distribution would be $39,500. That is illustrative arithmetic showing the shape of the two layers, not a projection. Whether any reduced rate is available depends on the specific treaty, the shareholder's qualification under it, and the documentation in the payer's hands.

Structuring the return as interest rather than dividends is the obvious next thought, and it runs into a wall in a related-party structure. The portfolio interest exception of IRC §881(c) and IRC §871(h) does not apply to interest received by a 10-percent shareholder, which a parent holding a blocker plainly is.

The obligation that attaches the moment related parties transact

Once the blocker sits under a foreign parent and transacts with it or any affiliate, transfer pricing stops being an abstraction. IRC §482 authorizes the IRS to allocate income and deductions among commonly controlled entities to reflect arm's length results, and Treas. Reg. §1.482-1(b)(1) states the standard as the results that would have been realized had uncontrolled taxpayers engaged in the same transaction under the same circumstances. Management fees, intercompany services, brand licensing, cost sharing, and intercompany loans all sit inside that scope.

Two attachments follow automatically. A 25 percent foreign-owned domestic corporation is a reporting corporation under IRC §6038A and files Form 5472 with its Form 1120, reporting related-party transactions in the categories listed at Treas. Reg. §1.6038A-2(b)(3), carrying the $25,000 per-year penalty of IRC §6038A(d)(1) and the continuation penalty of §6038A(d)(2). And IRC §6662(e) imposes a 20 percent accuracy-related penalty on an underpayment attributable to a net IRC §482 adjustment exceeding the lesser of $5,000,000 or 10 percent of gross receipts, rising to 40 percent under IRC §6662(h) where the net adjustment exceeds the greater of $20,000,000 or 20 percent of gross receipts.

The base erosion and anti-abuse tax of IRC §59A is often raised here and rarely reaches this scale: an applicable taxpayer under IRC §59A(e) must have average annual gross receipts of at least $500,000,000 for the three-taxable-year period ending with the preceding year, plus a base erosion percentage of 3 percent or higher, or 2 percent for groups including a bank or registered securities dealer.

The honest accounting, and what to do next

A blocker converts a problem about who files into a problem about how much leaks between layers. The investors stop having U.S. returns. In exchange, income is taxed at the corporate level and taxed again on distribution, with the second charge relieved only to the extent a treaty article applies and the paperwork supports it.

That trade favors structures where the investor base is broad or sensitive to U.S. filing, where earnings are reinvested rather than distributed annually, and where the shareholders have a clean treaty position. It disfavors structures where a single owner wanted the money out every year, where no treaty applies, and where the operating income would not have been effectively connected in the first place.

That last case is the most common way a blocker is built for nothing. If the underlying activity is not a U.S. trade or business under IRC §864(b), and the income is not effectively connected under IRC §864(c), there was no attribute to block and the structure has introduced a 21 percent corporate charge against a problem that did not exist.

So the sequence is: establish whether there is effectively connected income at all; then establish the shareholders' treaty positions and whether they survive the limitation on benefits article; then model the two-layer arithmetic against the single-layer alternative on your own numbers. Only then form anything. That modeling is the substance of the firm's structural review, and it belongs before the entity exists rather than after. Wider background sits on the incorporation architecture pillar. This article is general information about how the cited provisions operate, not advice on any particular structure.