Incentive units in an LLC or partnership, when structured as profits interests, receive some of the most favorable tax treatment in the code: zero federal income tax at grant, and future appreciation taxed at long-term capital gains rates rather than ordinary income rates. Getting there depends on four things lining up. The interest must have zero liquidation value on the grant date, the grant must fit inside the IRS safe harbor, a Section 83(b) election generally needs to be filed within 30 days, and the holding period has to be long enough to qualify for capital gains treatment under both the general one-year rule and, for many recipients, a separate three-year rule for carried interests.
Why a Profits Interest Is Worth Zero at Grant
A profits interest is a partnership interest that would pay the holder nothing if the company liquidated the day after the grant. That zero-liquidation-value test is the foundation of the tax result. Revenue Procedure 93-27 defines a capital interest as one entitling the holder to a share of proceeds if assets were sold at fair market value and distributed in full liquidation, and defines a profits interest as any partnership interest that is not a capital interest. The holder participates only in appreciation and profits above a baseline set at the grant date.
That baseline is the hurdle. It equals the fair market value of the company’s equity on the grant date, and it is what makes the unit worth nothing on day one. Private companies typically set the hurdle through a formal valuation that has to be defensible if the IRS ever looks at it. The incentive unit starts with a zero capital account balance. Existing capital partners receive their proportional share of the pre-grant value first, and the incentive unit holder receives a percentage of everything above that threshold.
Setting the hurdle below the company’s actual fair market value collapses the structure. The unit then has a capital component at grant, it is no longer a pure profits interest, and the safe harbor is unavailable. The recipient can owe ordinary income tax on the difference between the hurdle and the true FMV, even though nothing came in as cash.
The IRS Safe Harbor and Its Disqualifiers
The IRS will not treat receipt of a profits interest as a taxable event if the grant meets the safe harbor in Revenue Procedure 93-27. The safe harbor does not apply if any of three conditions are present:
- The profits interest relates to a substantially certain and predictable stream of income from partnership assets, such as income from high-quality debt securities or a high-quality net lease.
- The partner disposes of the profits interest within two years of receiving it.
- The interest is a limited partnership interest in a publicly traded partnership.
The predictable-income exception is the one that catches partnerships holding mostly passive assets rather than operating businesses. An LLC that owns investment-grade bonds or triple-net leases probably falls outside the safe harbor. The two-year disposal rule means selling or transferring the interest too early can retroactively make the original grant taxable as ordinary income.
Unvested Interests
Revenue Procedure 2001-43 extends the safe harbor to unvested profits interests, but adds two conditions. The partnership and the service provider must treat the recipient as the owner of the interest from the grant date, meaning the recipient reports their distributive share of partnership income, gain, loss, deduction, and credit for the entire holding period. And neither the partnership nor any partner may deduct any amount as compensation for the fair market value of the interest, at grant or at vesting.1IRS.gov. Rev. Proc. 2001-43 When those conditions and the Rev. Proc. 93-27 requirements are met, the recipient technically does not need to file a Section 83(b) election to avoid tax at grant or vesting. Most tax advisors file one anyway as a safety net.
Filing the 83(b) Election
Section 83 of the Internal Revenue Code governs taxation of property transferred for services, including incentive units subject to vesting. Under Section 83(a), the recipient normally recognizes ordinary income when the property is no longer subject to a substantial risk of forfeiture, which for most incentive units means at vesting. For a profits interest that has appreciated between grant and vesting, that timing can produce a large ordinary income tax bill on value the recipient cannot easily convert to cash.
An 83(b) election shuts that door. By electing to recognize income at grant rather than at vesting, the recipient locks in the grant-date value as the taxable amount. For a properly structured profits interest, that value is zero, so the election produces zero taxable income.2Office of the Law Revision Counsel. 26 USC 83 – Property Transferred in Connection With Performance of Services All subsequent appreciation then moves from the ordinary-income column to the capital-gains column, assuming holding-period requirements are satisfied.
The 30-Day Deadline
The election must be filed no later than 30 days after the grant date. The deadline is statutory and cannot be extended. Miss it by a day and the election is gone. Starting in 2025, the IRS began accepting electronic filing of 83(b) elections through Form 15620, submitted through the taxpayer’s online IRS account. The traditional method (certified mail with return receipt requested to the IRS service center) remains available. A copy has to go to the company as well. If you mail the election, keep the certified mail receipt and the return receipt; without that proof you have no way to demonstrate timely filing if the IRS raises the question years later.
Without the election, tax is deferred to vesting, but at vesting the recipient owes ordinary income tax on the difference between the unit’s fair market value and what was paid for it. If the company has grown, that creates a liability on paper gains with no cash to pay it. Ordinary income rates for high earners reach 37%, compared to a top long-term capital gains rate of 20%. The capital-gains holding period also starts at vesting rather than grant, which can push long-term treatment years down the road.
Forfeiture After Filing
The 83(b) election is a one-way door. Leave before fully vesting, and you get no deduction for the forfeited units. The statute is explicit: “if such property is subsequently forfeited, no deduction shall be allowed in respect of such forfeiture.”2Office of the Law Revision Counsel. 26 USC 83 – Property Transferred in Connection With Performance of Services The regulations treat the forfeiture as a sale or exchange where the realized loss equals what you paid minus what you got back.3GovInfo. 26 CFR 1.83-2 – Election to Include in Gross Income in Year of Transfer Since most profits interest holders pay nothing for their units and get nothing back on forfeiture, the realized loss is zero. For a properly structured profits interest where grant-date value was zero, this hurts less because no tax was paid on the election in the first place.
Tax at a Sale or Liquidity Event
When the company is sold, merges, or recapitalizes, the incentive unit holder receives a distribution calculated under the operating agreement’s waterfall: their percentage interest in equity value above the hurdle. If the 83(b) election was filed, the holding period started the day after the grant date.4Internal Revenue Service. Topic No. 409, Capital Gains and Losses Hold for more than one year from that date and the gain qualifies as long-term capital gain. For 2026, long-term capital gains rates are 0% on taxable income up to $49,450 for single filers ($98,900 for married filing jointly), 15% up to $545,500 ($613,700 jointly), and 20% above those thresholds.
Basis is typically zero for a profits interest holder who paid nothing and recognized no income at grant. On a $1 million payout, that means $1 million of gain. If the election was missed and the holder recognized ordinary income at vesting, that amount adds to basis and reduces the later gain by the same figure.
The Section 1061 Three-Year Rule
Section 1061 catches a lot of profits interest holders off guard. For “applicable partnership interests,” the normal one-year holding period for long-term capital gains treatment is extended to three years. Any net long-term capital gain that would not qualify under a three-year test is recharacterized as short-term capital gain and taxed at ordinary income rates.5Office of the Law Revision Counsel. 26 USC 1061 – Partnership Interests Held in Connection With Performance of Services This applies whether or not an 83(b) election was filed.
An applicable partnership interest is broadly any interest transferred to or held by a taxpayer in connection with performing services in an “applicable trade or business,” including raising or returning capital, investing, disposing of securities, or developing real estate. That definition covers most private equity, venture capital, and hedge fund carried interests, and it can reach profits interests in operating companies depending on how the business activities are characterized.
Not every profits interest is caught. Interests held directly or indirectly by a C-corporation are excluded, though S-corporations and certain passthroughs do not qualify for the carve-out.6eCFR. 26 CFR 1.1061-3 – Exceptions to the Definition of an API Gains attributable to a partner’s capital interest, as distinct from their profits interest, are also outside the three-year recharacterization. And an interest bought at fair market value by an unrelated non-service provider is not an applicable partnership interest for the buyer. For most operating-company profits interest holders, the practical question is whether the partnership’s activities fall inside the applicable-trade-or-business definition; the line is not always clear.
The 3.8% Net Investment Income Tax
Gains from selling a profits interest can also trigger the 3.8% Net Investment Income Tax when the holder’s modified adjusted gross income exceeds the statutory thresholds: $200,000 for single filers and heads of household, $250,000 for married filing jointly, and $125,000 for married filing separately.7Internal Revenue Service. Net Investment Income Tax These amounts are not indexed for inflation and have not changed since the tax took effect in 2013.
NIIT hits net investment income, which includes capital gains from selling partnership interests when the partner was passive. Active participants may escape it. A profits interest holder who works full-time as an executive at the company will usually qualify as active; one holding the interest purely as a passive investor generally will not.8Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
You Are Now a Partner, Not an Employee
Receiving a partnership interest changes your tax status for that stream of income. The IRS treats you as a partner rather than an employee, the company stops withholding income tax on the partnership piece, and you receive a Schedule K-1 instead of a W-2 for that income.9Internal Revenue Service. Partners Instructions for Schedule K-1 (Form 1065) You owe tax on your allocable share of partnership income whether or not cash is actually distributed. That is the source of the phantom income problem: a tax bill on income you have not received.
Self-Employment Tax
Partners are generally considered self-employed and owe self-employment tax on their net earnings from self-employment. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.10Internal Revenue Service. Topic No. 554, Self-Employment Tax Half of the self-employment tax is deductible in figuring adjusted gross income, but the upfront hit is meaningfully more than the employee-side FICA you were paying before.
Section 1402(a)(13) excludes a limited partner’s distributive share of partnership income from self-employment tax, other than guaranteed payments for services.11Internal Revenue Service. Self-Employment Tax and Partners Whether a profits interest holder counts as a limited partner for this purpose is one of the murkier corners of partnership tax. The IRS has not issued definitive guidance, and the answer depends on factors including authority to bind the partnership, personal liability, and active management. A profits interest holder who also serves as a managing member almost certainly does not qualify for the exception.
Quarterly Estimated Tax Payments
Without withholding on your partnership income, you make quarterly estimated payments using Form 1040-ES. Due dates are April 15, June 15, September 15, and January 15 of the following year.12Internal Revenue Service. Estimated Tax You generally must pay estimates if you expect to owe at least $1,000 after withholding and refundable credits, and your withholding and credits will cover less than 90% of the current year’s tax or 100% of the prior year’s (110% if your prior-year AGI exceeded $150,000). Underpayment brings a penalty even if you end up with a refund.
Many recipients continue drawing a salary for a non-partner role and get a W-2 with normal withholding. The K-1 income sits on top of that. If it is not covered through estimated payments or bumped-up W-2 withholding, the result at filing time is a tax bill plus an underpayment penalty.