Private equity tax structuring turns on a small set of decisions that compound across the life of a fund: how carried interest qualifies for capital gains rates, whether the fund and its portfolio companies avoid an entity-level tax, how much of the acquisition debt is actually deductible, and which elections lock in a stepped-up basis or an outright gain exclusion. Get these right and the after-tax return can look very different from the pre-tax model. Get one wrong and the leakage runs for years.
Carried Interest and the Three-Year Holding Period
Fund managers earn two streams. A management fee, typically 2% of committed capital, is ordinary income taxed at rates up to 37%. Carried interest, typically 20% of gains above a hurdle, has historically qualified for long-term capital gains treatment at a top federal rate of 20%.1Internal Revenue Service. Topic No. 409, Capital Gains and Losses
The Tax Cuts and Jobs Act narrowed that advantage by adding Section 1061 to the Internal Revenue Code.2Federal Register. Guidance Under Section 1061 Gains allocated through an “applicable partnership interest” are recharacterized as short-term capital gains, taxed at ordinary income rates, unless the underlying assets were held for more than three years.3Office of the Law Revision Counsel. 26 USC 1061 – Partnership Interests Held in Connection With Performance of Services The standard one-year holding period still applies to limited partners who invest capital without providing services.1Internal Revenue Service. Topic No. 409, Capital Gains and Losses
The three-year clock has cash consequences. An exit at two years and eleven months converts the carry on that deal from capital gain to ordinary income. On a $50 million carry allocation, the additional federal tax can easily exceed $8 million. Tiered partnerships add a second layer of risk: final regulations require partnerships to track allocations between contributed capital and performance-based interests in contemporaneous books and records, and a failure to maintain that separation can cause the entire interest to be recharacterized.4Internal Revenue Service. Section 1061 Reporting Guidance FAQs
Transfers of applicable partnership interests to related parties trigger immediate recognition of short-term gain on any assets held three years or less, even when the transfer would otherwise be tax-deferred.3Office of the Law Revision Counsel. 26 USC 1061 – Partnership Interests Held in Connection With Performance of Services
Self-Employment Tax, Fee Waivers, and the 3.8% Surtax
The ordinary-income side of manager compensation carries a second cost. A general partner’s share of partnership income is subject to self-employment contributions act (SECA) tax, which funds Social Security and Medicare. For high earners that adds up to 3.8% on top of the ordinary rate (2.9% Medicare plus the 0.9% Additional Medicare Tax). Limited partners can generally exclude their distributive share from self-employment tax, but guaranteed payments for services stay taxable regardless of partner status.5Internal Revenue Service. Self-Employment Tax and Partners
Some managers use fee waivers to convert what would be ordinary management fee income into a special profit allocation taxed as capital gain. The IRS tests these arrangements against a “significant entrepreneurial risk” standard. If the allocation is capped, covers a short window, or is measured against gross income rather than net profit, the IRS presumes it lacks real risk and treats it as a disguised payment for services taxable at ordinary rates.6Federal Register. Disguised Payments for Services
For a waiver to hold up, the profit allocation generally needs to be measured over the life of the fund, tied to net income that isn’t reasonably determinable in advance, and backed by a clawback obligation the manager can realistically satisfy. Relabeling a predictable fee stream as a profit allocation will not survive scrutiny. The IRS also requires that the waiver be binding and that the partnership and its partners receive timely notice of its terms.6Federal Register. Disguised Payments for Services
On the capital-gains side, high-income individuals owe a 3.8% surtax on net investment income once modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly).7Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax Nearly every fund manager and institutional investor clears those thresholds, so the practical top federal rate on long-term capital gains is 23.8%, not the 20% seen in isolation. The tax reaches capital gains, dividends, interest, rental income, and other passive income, including gains from selling a partnership interest to the extent the partner was passive.8Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
Why Funds Use Pass-Through Entities
Most private equity funds are organized as limited partnerships or limited liability companies taxed as partnerships. The reason is direct: pass-through entities don’t pay federal income tax at the entity level. Income, gains, losses, and deductions flow through to each partner’s individual return and the partner pays tax once. A C corporation pays a 21% corporate tax, and shareholders pay a second layer on any dividends. Pass-through structures eliminate the second layer entirely.
The limited partnership form also creates a clean division of roles. The general partner runs the fund and bears unlimited liability. Limited partners contribute capital, hold liability limited to their investment, and stay out of day-to-day decisions. The allocation of different income types (interest, dividends, capital gains, ordinary business income) among partners follows the partnership agreement, which lets funds direct tax attributes to the partners who benefit most.
Those allocation provisions must have “substantial economic effect” to be respected. Getting them wrong doesn’t just create audit exposure; it can make the fund unattractive to institutional investors who need specific tax treatment to meet their own obligations. The LP-versus-LLC choice varies by state, and annual maintenance costs differ, but the underlying advantage of no entity-level tax is the same.
Interest Deductions on Leveraged Buyouts
Debt is the engine of a buyout. The fund puts up equity, borrows the rest, and the target’s cash flow services the debt. Section 163(j) limits how much of that interest is deductible. The general rule caps the deduction at 30% of the company’s adjusted taxable income (ATI), plus business interest income.9Office of the Law Revision Counsel. 26 USC 163 – Interest
For tax years beginning after December 31, 2024, the One Big Beautiful Bill Act restored the add-back of depreciation, amortization, and depletion when calculating ATI, making the limitation less restrictive than it was from 2022 through 2024.10Internal Revenue Service. Questions and Answers About the Limitation on the Deduction for Business Interest Expense A capital-intensive target with large depreciation deductions now has more room to deduct interest than it did during the EBIT years.
Interest above the cap isn’t lost. Disallowed business interest carries forward to future tax years.11eCFR. 26 CFR 1.163(j)-5 – General Rules Governing Disallowed Business Interest Expense Carryforwards A carryforward delays the cash benefit, though, and in a highly leveraged deal the timing of deductions can move the internal rate of return meaningfully. Sponsors model how ATI behaves as the company grows, how much depreciation the asset base generates, and what happens to deductibility if EBITDA drops during a downturn. The 163(j) cap also shapes the capital structure itself: firms sometimes accept less leverage than lenders would offer because the marginal interest deduction isn’t worth the marginal dollar of debt.
Basis Step-Up Elections in Acquisitions
How a deal is structured as a purchase drives the tax basis of the assets, and basis drives depreciation and amortization for years afterward. Buyers generally prefer asset purchases for the stepped-up basis. Sellers generally prefer stock sales to avoid double tax at the corporate and shareholder levels. Two elections bridge that gap.
Section 338(h)(10)
A Section 338(h)(10) election treats a stock purchase as an asset purchase for federal tax purposes. The target is deemed to have sold all of its assets at fair market value and then liquidated, giving the buyer a stepped-up basis in the assets even though what changed hands was stock.12Office of the Law Revision Counsel. 26 USC 338 – Certain Stock Purchases Treated as Asset Acquisitions
Both the buyer and the selling consolidated group or S corporation shareholders must agree. Because the deemed asset sale generates immediate tax for the seller, the purchase price usually includes a gross-up to compensate. That gross-up negotiation is one of the more contentious parts of deal pricing. Getting asset valuations wrong cuts both ways: understating them shortchanges the buyer’s future deductions, and overstating them inflates the seller’s immediate tax hit.
Section 754 for Partnership Interest Transfers
When a buyer acquires a partnership interest instead of corporate stock, a different mechanism does similar work. Under Section 754, a partnership can elect to adjust the inside tax basis of its assets when an interest changes hands.13Office of the Law Revision Counsel. 26 USC 754 – Manner of Electing Optional Adjustment to Basis of Partnership Property The Section 743(b) adjustment aligns the new partner’s share of inside basis with what they paid, preventing tax on gains that economically belonged to the prior owner.
Once made, the election applies to all future transfers and distributions unless the IRS approves a revocation. That permanence matters. The election helps when assets have appreciated, but cuts the other way when assets have declined, forcing a step-down. The IRS will not approve a revocation if the primary purpose is to avoid a basis reduction.14Internal Revenue Service. FAQs for Internal Revenue Code (IRC) Sec. 754 Election and Revocation
Qualified Small Business Stock After the 2025 Expansion
Section 1202 lets a non-corporate holder exclude some or all of the gain on qualified small business stock (QSBS). The One Big Beautiful Bill Act, enacted July 4, 2025, expanded the benefit significantly. For stock acquired after that date, the exclusion phases in with holding period:
- Three years: 50% of gain excluded.
- Four years: 75% of gain excluded.
- Five or more years: 100% of gain excluded.
The per-issuer cap rose from $10 million to $15 million (or ten times the taxpayer’s basis in the stock, if greater), indexed for inflation starting in 2027. The gross asset threshold for qualifying companies rose from $50 million to $75 million, opening the door to more portfolio companies.
The eligibility rules are strict. The issuer must be a domestic C corporation with gross assets not exceeding $75 million at issuance. The stock must be acquired at original issuance in exchange for cash, property, or services, not on the secondary market. During substantially all of the holding period, at least 80% of the company’s assets by value must be used in a qualified trade or business. Financial services, law, accounting, health, and engineering are among the excluded industries.
For private equity, the practical question is whether the exclusion flows through a pass-through fund to its investors. It can, but only if the partner held an interest in the pass-through on the date it acquired the QSBS and held that interest continuously until the stock was sold. Only non-corporate taxpayers can claim the exclusion. QSBS planning has to begin before the fund acquires the target.
Structuring Around Tax-Exempt and Foreign Investors
Fund LPs include pension plans, endowments, foundations, and sovereign wealth funds. Their tax profiles differ from individuals in ways that shape the fund’s structure.
UBTI and Blocker Corporations
Tax-exempt organizations (including IRAs) that invest in partnerships can generate unrelated business taxable income (UBTI). UBTI arises when partnership activities constitute a trade or business unrelated to the exempt organization’s purpose, and the organization must include its share of gross income from that business, along with related deductions, in its UBTI calculation.15Office of the Law Revision Counsel. 26 U.S. Code 512 – Unrelated Business Taxable Income
Debt-financed income is the most common UBTI trigger in private equity. When a fund uses leverage in a buyout, the portion of income attributable to borrowed funds can be treated as debt-financed income, pulling it into UBTI even when the underlying investment income would otherwise be exempt. Tax-exempt investors with $1,000 or more in gross UBTI must file Form 990-T. Many funds offer parallel “blocker” structures that interpose a corporation between the fund and its tax-exempt investors, absorbing the UBTI at the corporate level. The trade-off is a layer of corporate tax on income flowing through the blocker.
Withholding on Foreign Partners
Foreign partners face withholding on their share of effectively connected income (ECI). The partnership must withhold at the highest applicable rate: the top individual rate for non-corporate foreign partners, and the corporate rate for foreign corporate partners. When a foreign partner sells or transfers a partnership interest, the transferee must withhold 10% of the amount realized on the disposition.16Office of the Law Revision Counsel. 26 U.S. Code 1446 – Withholding of Tax on Foreign Partners Share of Effectively Connected Taxable Income
ECI is taxed on a net basis at graduated rates, so foreign partners can deduct expenses connected to the income. The withholding obligation, however, sits with the partnership, and a failure to withhold properly exposes the fund to liability for the unpaid amount plus interest. These mechanics push foreign investors toward the same blocker structures used by tax-exempt LPs, or toward offshore feeder funds designed to manage the withholding and reporting.
Qualified Opportunity Zones and the 2026 Deadline
Qualified Opportunity Zones let investors defer and potentially reduce capital gains tax by reinvesting gains into a Qualified Opportunity Fund (QOF). The benefits track the holding period:17Internal Revenue Service. Invest in a Qualified Opportunity Fund
- Capital gains invested in a QOF are deferred until the investment is sold or December 31, 2026, whichever comes first.
- Hold the QOF investment for at least five years and basis increases by 10% of the deferred gain.
- Hold for seven years and basis increases by an additional 5%.
- Hold for at least ten years and you can elect to increase basis to fair market value at the time of sale, permanently excluding any appreciation in the QOF investment from federal tax.
December 31, 2026 is the date to watch. On that date, any remaining deferred gain becomes taxable whether or not the investment has been sold.18Internal Revenue Service. Opportunity Zones Frequently Asked Questions For funds that entered QOZ investments before 2020, the five- and seven-year step-ups may already be locked in. For newer investments, the deferral is expiring soon, though the ten-year exclusion on QOF appreciation remains available. For a QOZ investment evaluated in 2026, the deferral benefit is essentially gone, but the long-term exclusion on new appreciation can still be substantial if the underlying asset appreciates over a decade.