Incentive units in an LLC or partnership, usually structured as profits interests, are taxed at $0 when granted if they’re set up correctly, and all future appreciation can qualify for long-term capital gains rates instead of ordinary income rates if you file a Section 83(b) election within 30 days of the grant. That is the whole game. Miss the 30-day window, fail one of the IRS safe harbor conditions, or run afoul of the three-year carried interest rule, and value you never received in cash can end up taxed at ordinary rates as high as 37%.
The rest of this article walks through what triggers tax and when, what the 83(b) election actually does, and the follow-on obligations most recipients don’t see coming: self-employment tax, quarterly estimates, and the Net Investment Income Tax.
Why There’s No Tax at Grant
A profits interest is a partnership interest that would pay you nothing if the company liquidated the day after you received it. That zero-liquidation-value test is the foundation of the favorable treatment. 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 liquidation, and defines a profits interest as any partnership interest that is not a capital interest. You participate only in future appreciation above a baseline.
That baseline is the hurdle. It equals the fair market value of the company’s equity on the grant date, and it’s what makes the unit worth zero on day one. The operating agreement’s distribution waterfall puts existing capital partners first, up to the pre-grant value, and only then does the incentive unit holder share in anything above that threshold. Private companies typically establish the hurdle through a formal valuation, and that valuation needs to be defensible if the IRS asks.
Set the hurdle too low and the unit has capital value at grant. It stops being a pure profits interest, the safe harbor evaporates, and the recipient can owe ordinary income tax on the gap between the hurdle and the true fair market value, with no cash in hand to pay it.
The Section 83(b) Election
Section 83 of the Internal Revenue Code governs taxation of property transferred for services. Under Section 83(a), you normally recognize ordinary income when the property is no longer subject to a substantial risk of forfeiture, meaning at vesting. For a profits interest that has grown significantly between grant and vesting, that would mean a large ordinary income bill on value you can’t easily convert to cash.
The 83(b) election flips that result. You elect to recognize income at grant instead of at vesting, which 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.1Office of the Law Revision Counsel. 26 USC 83 – Property Transferred in Connection With Performance of Services All later appreciation then moves from ordinary income to capital gains treatment, assuming you meet the holding period.
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.1Office of the Law Revision Counsel. 26 USC 83 – Property Transferred in Connection With Performance of Services One day late 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, mailing the election to the IRS service center via certified mail with a return receipt requested, also remains available. Either way, give a copy to the company. If you mail it, keep the certified mail receipt and the return receipt; without that proof, you have no way to show you met the deadline if the issue surfaces years later.
What Happens if You Skip the Election
Without the election, you wait until vesting to address tax. At that point, you owe ordinary income tax on the difference between the unit’s fair market value at vesting and what you paid for it. Ordinary rates for high earners reach 37%, compared with a 20% top long-term capital gains rate. The capital gains holding period also starts at vesting rather than at grant, which can push a sale into short-term territory even if you’ve been at the company for years.
Note on unvested interests: Revenue Procedure 2001-43 extends the Rev. Proc. 93-27 safe harbor to unvested profits interests if the partnership and recipient treat the recipient as the owner from the grant date and no one deducts the interest’s value as compensation.2IRS.gov. Rev. Proc. 2001-43 When those conditions and the Rev. Proc. 93-27 requirements are all met, you technically don’t need to file an 83(b). Most tax advisors recommend filing it anyway as a safety net. The downside of filing a protective election on a zero-value interest is nothing; the downside of not filing and being wrong is a tax bill at ordinary rates.
Safe Harbor Conditions That Can Disqualify the Grant
The IRS will not treat receipt of a profits interest as a taxable event if the grant meets the Rev. Proc. 93-27 safe harbor. Three conditions blow the safe harbor:
- 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 catches partnerships that primarily hold passive, income-generating assets rather than operating businesses or growth-stage investments. An LLC holding a portfolio of 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.
Tax at a Liquidity Event
When the company is sold, merges, or recapitalizes, you receive a cash distribution calculated under the operating agreement’s waterfall: your percentage interest in the equity value above the hurdle.
If you filed an 83(b), your holding period started the day after the grant.3Internal Revenue Service. Topic No. 409, Capital Gains and Losses Hold for more than one year 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.
Without the election, the holding period starts at vesting, not grant. A sale soon after vesting can produce short-term gain taxed at ordinary rates.
The taxable gain is sale proceeds minus your adjusted basis. Basis is typically zero for a profits interest holder who paid nothing and recognized no income at grant. If you had to recognize ordinary income at vesting because the election was missed, that amount increases your basis. One million dollars of proceeds minus a zero basis is one million of long-term capital gain. The same proceeds against a $50,000 basis from vesting-date ordinary income would leave $950,000 of capital gain.
The Three-Year Rule for Carried Interest
Section 1061 catches many profits interest holders off guard. For “applicable partnership interests,” the one-year holding period for long-term capital gains treatment is extended to three years. Net long-term gain on these interests that wouldn’t qualify under a three-year test is recharacterized as short-term capital gain, taxed at ordinary rates.4Office of the Law Revision Counsel. 26 USC 1061 – Partnership Interests Held in Connection With Performance of Services It applies whether or not you filed an 83(b).
An applicable partnership interest is broadly defined: any partnership interest transferred to or held by a taxpayer in connection with performing services in an “applicable trade or business,” which covers activities related to raising or returning capital, investing, disposing of securities, or developing real estate. That definition sweeps in most private equity, venture capital, and hedge fund carried interests, and can reach profits interests in operating companies depending on how activities are characterized.
A few carve-outs exist. Interests held by a C-corporation are excluded, though S-corporations and certain passthroughs are not.5eCFR. 26 CFR 1.1061-3 – Exceptions to the Definition of an API Gains attributable to a partner’s actual capital interest are excluded from recharacterization. And an interest acquired at fair market value by an unrelated non-service provider is not an applicable partnership interest in the buyer’s hands.
For most recipients at operating companies, the practical question is whether the partnership’s activities fall inside the “applicable trade or business” definition. The line is not always clear, and guessing wrong means an unexpected bill at short-term rates on gain you thought was long-term.
The 3.8% Net Investment Income Tax
Gains from selling a profits interest can also trigger the 3.8% Net Investment Income Tax if your modified adjusted gross income exceeds the statutory thresholds: $200,000 for single filers and head of household, $250,000 for married filing jointly, and $125,000 for married filing separately.6Internal Revenue Service. Net Investment Income Tax Those amounts are not indexed for inflation and have been unchanged since the tax took effect in 2013.
NIIT applies to net investment income, which includes capital gain from selling a partnership interest when the partner was passive. If you actively participated in the business, your gain may not be subject to NIIT. Material participation generally requires regular, continuous, and substantial involvement. A profits interest holder who is also a full-time executive usually qualifies as active; a pure investor holder usually does not.7Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
Your Tax Life Changes the Day You Become a Partner
Receiving a partnership interest changes your tax status. The IRS treats you as a partner, not an employee, for the income flowing through the partnership. The company stops withholding income tax on that portion of your compensation. Instead of a W-2, you get a Schedule K-1 reporting your share of partnership income, deductions, and credits.8Internal Revenue Service. Partners Instructions for Schedule K-1 (Form 1065) You owe tax on your allocable share whether or not cash is actually distributed, which is the classic phantom income problem.
Self-Employment Tax
Partners are generally self-employed and owe self-employment tax on net earnings from self-employment. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.9Internal Revenue Service. Topic No. 554, Self-Employment Tax Half is deductible when calculating adjusted gross income, but the upfront hit still exceeds the employee-side FICA you paid before.
Section 1402(a)(13) excludes a limited partner’s distributive share from self-employment tax, other than guaranteed payments for services.10Internal 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 areas of partnership tax law. The IRS has not issued definitive guidance. The answer turns on factors like authority to bind the partnership, personal liability, and active participation in management. If you also serve as a managing member, you almost certainly don’t qualify.
Quarterly Estimated Payments
Without employer 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.11Internal Revenue Service. Estimated Tax You generally need to 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 your current-year liability or 100% of your prior-year liability (110% if your prior-year adjusted gross income exceeded $150,000). Underpayment triggers a penalty even if you end up owed a refund.
Many recipients still draw a salary from the company for non-partner work, which continues to generate a W-2 with normal withholding. The K-1 income sits on top. If you don’t cover it through estimates or increased W-2 withholding, you face both a tax bill and an underpayment penalty at filing.
One Note on Forfeiture
The 83(b) election is a one-way door. If you file and then forfeit the units by leaving before vesting, you get no deduction for the loss. The statute is explicit: “if such property is subsequently forfeited, no deduction shall be allowed in respect of such forfeiture.”1Office of the Law Revision Counsel. 26 USC 83 – Property Transferred in Connection With Performance of Services Treasury regulations treat the forfeiture as a sale or exchange where the realized loss equals what you paid minus what you got back.12GovInfo. 26 CFR 1.83-2 – Election to Include in Gross Income in Year of Transfer For a profits interest holder who paid nothing and receives nothing back, that realized loss is zero. For a properly structured profits interest with zero value at grant, the election itself cost you no tax, so forfeiture leaves you no worse off tax-wise than you started. The harder case is someone who filed an 83(b) on property with real value at grant and paid tax on it: they lose both the property and the tax, with no way to recover either.