A blocker corporation is a US C-corporation inserted between a private fund and an underlying pass-through investment to prevent tax-exempt limited partners from recognizing unrelated business taxable income (UBTI) directly.

How it works

Tax-exempt LPs (pensions, endowments, charities) generally avoid federal income tax on investment returns but face UBTI when they receive active business income through partnerships. A fund invests via a blocker corp that holds the partnership interest or operating asset; income arrives at the LP as dividends from a corporation rather than K-1 pass-through of operating income.

Blockers add corporate-level tax and administrative cost but preserve LP tax status. Venture funds more often use blockers in later-stage deals with debt, blocker acquisitions, or when selling portfolio companies structured as asset-heavy partnerships.

Founders selling to PE may encounter buyer entities that are blockers in a larger acquisition stack — usually invisible to day-to-day operations post-close. Tax counsel for the fund, not the startup CEO, typically designs blocker placement; founders encounter the concept mainly in complex secondary or PE-led exits.

Why it matters

• Investors (LPs/GPs): Fund formation lawyers model blocker needs before first close; missing blockers can scare off large tax-exempt anchors.
• Founders: Rarely choose blockers; understand they can add closing complexity and timing in PE-led exits.
• Operators: Post-acquisition HR and payroll stay the same; tax structure sits at holding company level.

Common mistake

Founders googling “blocker” during exit and assuming it blocks the deal from closing. It is a tax wrapper, not a veto right.

Related ideas

UBTI, fund structure, carried interest, and private equity acquisition vehicles.