Founder Vesting for LLCs: What Happens If a Partner Walks Away

Here is the scenario, and it is common enough to be a genre. Two founders split a new LLC 50/50. Eight months in, one gets a job offer, or has a baby, or just loses interest. They stop showing up. They also still own half the company, and under New York's default rules, they will own half of everything the remaining founder builds for the next decade.

Nothing about forming an LLC prevents this. Preventing it takes one concept most first-time founders have never applied to an LLC: vesting.

The Default: Equity Is Forever

Once a membership interest is issued, it belongs to the member. New York's LLC Law contains no rule that ties ownership to continued effort. A member who stops working forfeits nothing. There is no statutory mechanism to expel a member, and no default right for the company to repurchase their interest. The departing member cannot force the company to cash them out either; absent a contrary operating agreement, a member may not withdraw and demand payment before dissolution (NY LLC Law § 606). So the default outcome is the worst of both worlds: they cannot leave cleanly, and you cannot make them leave at all. They simply stop contributing and keep collecting their share.

The lesson: whatever protection you want has to be written into the operating agreement or a membership interest grant agreement. The statute will not supply it.

Vesting Isn't Just for Delaware Startups

Vesting in an LLC works much like founder stock vesting in a corporation, with different paperwork. The member receives their full percentage on day one, but the interest is subject to forfeiture (or repurchase at a nominal price) if the member stops providing services before it vests on an agreed schedule. Ownership, in other words, is earned over time even though it is granted up front.

There is another way to build it, and founders often raise it because it sounds tidier: issue the units as they are earned, a slice at a time, so there is nothing to claw back and no repurchase to negotiate. For a founder taking a capital interest in a new company, it is usually the worse trade. Each issuance is its own transfer, valued the day it happens, so the better the company does the more the later slices cost in tax, and no election fixes it after the fact. Granting the whole interest at formation and letting it vest settles that question on day one, when the interest is worth close to nothing. Forfeiture and buyback mechanics are what you pay for that treatment, and they are the easier problem to solve.

A few design choices matter more than the rest:

• The schedule. The startup convention is four years with a one-year cliff: nothing vests until the first anniversary, then the balance vests monthly. That convention exists for venture-track companies; a services business might tie vesting to revenue milestones or a shorter horizon. Pick a schedule that mirrors when the founder's contribution is actually delivered.
• Leaver definitions. What happens on death or disability (usually accelerated or fully vested), a firing without cause, or a walk-away? The difference between a "good leaver" and a "bad leaver" clause is the difference between an amicable exit and litigation.
• Acceleration. Full or partial vesting on a sale of the company (and, more conservatively, only if the buyer also terminates the founder: the "double trigger") protects founders from being vested out of their own exit.
• What happens to forfeited units. Cleanest is redemption by the company, which lifts every remaining member proportionately.

The Tax Piece: A 30-Day Window With No Extensions

Unvested equity has tax consequences, and this is where founders get hurt by not asking early.

If the interest is a capital interest (a share of the company's existing value, which is what founders splitting a new company typically hold), equity subject to vesting is governed by Section 83 of the Internal Revenue Code. By default, the IRS taxes each portion as it vests, at its value on the vesting date. If the company grows, that means paying ordinary income tax on the growth. The fix is the 83(b) election: a filing that tells the IRS to tax the whole interest at grant, when a brand-new company's value is at or near zero. The election must be filed within 30 days of the grant. The deadline is absolute; there are no extensions and no do-overs. Filed on time at formation, it usually costs nothing. Missed, it can turn a successful exit into an ordinary-income problem years later.

If the interest is a profits interest (a share only of future growth, common when a new member earns in later), IRS guidance (Rev. Proc. 93-27 and Rev. Proc. 2001-43) generally allows receipt tax-free at grant if safe harbor conditions are met, even with vesting attached. Many practitioners still file a protective 83(b).

Have a tax advisor look at the grant before you sign it, and calendar day 30. Most formation mistakes can be cleaned up later. A missed 83(b) cannot.

Vesting Protects Both of You

Founders sometimes resist proposing vesting because it sounds like distrust. It is the opposite: it is symmetry. Each founder is protected from the other's departure, and the one who stays is protected from working for years to enrich the one who left. It also gives the departing founder something valuable: a clean break at a defined price instead of an open-ended fight. And if the company ever raises outside money, investors will require founder vesting anyway; you are simply deciding the terms yourselves instead of having them imposed later.

Conclusion

An LLC without vesting is a promise that every founder will stay until the end, enforced by nothing. The conversation takes an hour, the drafting takes a few pages, and the 83(b) election takes a stamp. The alternative is owning a company together with someone who stopped showing up in month eight.

VMG Business Advisory drafts LLC operating agreements and membership grant documents with vesting, buyback, and leaver provisions fitted to how founders actually work, and coordinates with your tax advisor on the election deadlines.

This article is provided for general informational and educational purposes only. It does not constitute legal or tax advice or create an attorney-client relationship. The information is current as of August 2026 and subject to change. Equity and tax decisions, including any Section 83(b) election, should be made with qualified legal and tax advisors reviewing your specific facts. Attorney Advertising.