Cofounder Departure: Managing the Exit Without Blocking the Company

Three years after launching a B2B SaaS, two of the three cofounders want to continue; the third, the CTO, wants to leave. No open conflict, just a divergence on life plans. Without preparation, this departure can freeze the company for 18 months: capital trapped in the hands of a silent shareholder, banking signatures locked, Series A pushed back, technical team demoralised.

A cofounder leaving — quoted in the literature at 40 to 65 % of startups before Series B — is not exceptional. It is a statistically expected event that governance must anticipate. Mismanaged, it turns a simple transition into an existential crisis. Well-managed, it unblocks the company and may even strengthen it.

This operational guide describes a step-by-step protocol to manage a cofounder departure in 2026: legal qualification, vesting mechanics, buyback valuation, seller taxation, board and investor communication. It complements our Shareholders' agreement 2026 and our Ratchet, liquidation preference, anti-dilution.

• 40 to 65 % of startups see a cofounder leave before Series B. The event is statistically expected.
• Three anticipatory clauses: vesting / reverse vesting, good leaver / bad leaver, call option. Without them, the buyback is negotiated from scratch under tension.
• The buyback valuation follows two logics: nominal value (bad leaver) or market value (good leaver). The gap can reach 80-90 %.
• The seller is taxed on capital gains (French Tax Code art. 150-0 A). Depending on the situation, enhanced allowances (retirement departure), tax deferral (contribution-disposal), JEI exemption may apply.
• Communication to the board, investors and team is as critical as the legal mechanics. Mistimed, it destabilises the company for 6 to 12 months.

Five dominant 2026 patterns:

• Life-plan divergence (relocation, parenthood, career switch) — about 35 % of cases.
• Strategic disagreement on product or market direction — 25 %.
• Stage misfit (creative cofounder unsuited to scale phase) — 20 %.
• Interpersonal conflict between cofounders — 15 %.
• Underperformance — 5 %.

The motive changes the legal qualification (good leaver vs bad leaver), and therefore the buyback price. This is the central issue of the first hours of negotiation.

These clauses must be signed in the shareholders' agreement and reflected in the bylaws from incorporation. Inserting them after the contemplated departure is late and asymmetric.

Clause 1 — Founder vesting / reverse vesting. Founder capital is not immediately vested: it vests over 4 years with a 1-year cliff (nothing vested before 12 months). On departure before 4 years, the unvested fraction is repurchasable at nominal value.

Clause 2 — Bad leaver / good leaver. Defines motives and consequences:

• Bad leaver: gross misconduct, abusive resignation, unfair competition → buyback at nominal value or with 50-90 % discount on the vested portion;
• Good leaver: illness, death, amicable agreement, legitimate cessation → buyback at market value.

Clause 3 — Unilateral call option. Gives the company, the other founders or the investors a right to repurchase the leaver's shares under predefined terms (price, deadline, payment terms).

The absence of these three clauses creates a situation where the leaver may remain a shareholder indefinitely, even blocking strategic decisions depending on voting rights.

2026 standard vesting: 48 months, 12-month cliff, monthly vesting thereafter. On 100,000 shares:

• months 0 to 11: 0 shares vested (cliff not crossed);
• month 12: 25,000 shares vested (1/4);
• months 13 to 47: +2,083 shares/month;
• month 48: 100,000 shares fully vested.

Reverse vesting: French variant where founders own all shares from day 1, but the company holds a buyback right at nominal value over the fraction not yet "vested" per the schedule. Preferred in France for tax reasons (income is crystallised at day 1, not progressively).

Acceleration on change of control: frequent variant — on company sale, vesting accelerates by 12 or 24 months ("single trigger") or fully if the cofounder is dismissed post-acquisition ("double trigger"). Double trigger is the 2026 market standard.

Departure qualification drives the buyback price. Typical gap: 70 to 90 % between regimes.

Bad leaver — typical motives:

• gross misconduct under labour law;
• early resignation without board approval in the first 24 months;
• breach of non-compete or confidentiality clauses;
• unfair competition;
• removal of the corporate officer for cause.

Good leaver — typical motives:

• death, disability, long-term illness;
• removal without cause by the board;
• amicable departure recorded in minutes;
• substantial change of role not accepted;
• non-renewal of the mandate at the company's initiative.

Grey zone — ambiguous motives:

• resignation after 36 months (often qualified good leaver if honourable execution);
• strategic divergence (case-by-case);
• health issue not yet formally declared.

The shareholders' agreement must list motives precisely and provide an arbitration mechanism in case of disagreement (typically: board decision by qualified majority, ultimately under judicial review). In 2026, French case law tends to recharacterise as good leaver amicable departures not motivated by clear fault (Cour de cassation, commercial chamber).

Bad leaver case: nominal value (often EUR 1 per share) or contribution value. Effect: the leaver does not capture created value. Justification: compensation for breach of the founder contract.

Good leaver case: market value. Three methods coexist:

• Last post-money valuation at the previous round — simplest, but possibly disconnected from reality if the round is old.
• Discount on last round — 20-30 % discount applied to the last post-money to reflect illiquidity and risk.
• Multi-criteria — weighted average DCF + comparables + last valuation. Most accounting-defensible.

"No fly zone" mechanism: to avoid disputes, some agreements provide that the buyback valuation is computed by an independent third party (mandated chartered accountant, or expert appointed by the commercial court president under article 1592 of the Civil Code). Such third-party valuation is legally enforceable and limits litigation.

Do not confuse buyback valuation with next round valuation: the former is generally discounted to reflect the illiquidity of the share transferred outside an event. The latter reflects market dynamics.

The selling cofounder is taxed on the capital gain (French Tax Code art. 150-0 A). Five regimes are possible:

Regime 1 — Single flat-rate tax (PFU 30 %). Default since 2018. 12.8 % income tax + 17.2 % social levies. Simple and readable.

Regime 2 — Election for progressive income tax. Allows the application of holding period allowances on shares acquired before 2018 (up to 65 % for > 8 years). Relevant if marginal rate ≤ 30 %.

Regime 3 — Enhanced retirement-departure allowance (Tax Code art. 150-0 D ter). For directors retiring, fixed EUR 500,000 allowance on the gain, applicable under strict conditions (minimum role duration, effective retirement within 24 months, etc.). In 2026, the scheme remains but with tightened conditions.

Regime 4 — Tax deferral via contribution-disposal (Tax Code art. 150-0 B ter). The seller contributes shares to a holding (their own holding or a family holding) before sale. The gain is deferred; it becomes taxable only if the holding itself sells the shares within 3 years and does not reinvest 60 % of the price. A powerful mechanism for high-amount partial sales. See our Holding company taxation service.

Regime 5 — JEI regime. For companies with Young Innovative Enterprise status at sale, targeted gain exemptions. Restricted case but worth verifying systematically.

The regime is chosen before the sale, ideally 12 to 18 months ahead for regime 4 (contribution-disposal), which requires anticipated wealth structuring.

Step 1 — Internalise the decision. Closed meeting, remaining founders + departing CEO. Validate the qualification (good / bad / amicable). Align on the calendar.

Step 2 — Legal audit of agreement + bylaws. Venture capital lawyer or in-house legal counsel. Identify applicable clauses, vested perimeter, leaver rights.

Step 3 — Buyback valuation. Chartered accountant or third-party expert per clause. Document the method to anticipate any challenge.

Step 4 — Seller tax optimisation. Regime choice, contribution-disposal anticipation if relevant.

Step 5 — Sign the settlement agreement. Document specifying: motive (good / bad), number of shares bought back, unit price, payment terms (cash, instalments, vendor credit), post-departure non-compete, release of personal guarantees.

Step 6 — Corporate decision. Statutory EGM to authorise the buyback, modify cap-table, discharge the leaver from corporate roles.

Step 7 — Board and investor communication. Formal letter to the board, cap-table impact presentation, operational transition plan.

Step 8 — Internal and external communication. Team announcement, replacement plan, key client communication if leaver was client-facing.

Step 9 — 6-month follow-up. Verify compliance with post-departure clauses (non-compete, confidentiality, instalment payments). Anticipate possible disputes.

The sequence matters:

• D0: board information (call or extraordinary meeting), formal motivated letter.
• D0 + 24h: briefing of main co-investors (seed lead, Series A lead).
• D0 + 48 to 72h: team announcement (plenary meeting, not by email).
• D0 + 1 week: key client communication if needed.
• D0 + 2 weeks: external announcement if relevant (LinkedIn, press release).

Frequent error: announcing internally before investors. This breaks trust and triggers rushed due diligences. The reverse sequence (board → investors → team → external) protects stability.

The operational transition plan must be drafted and presented simultaneously with the announcement. Without a credible plan, the team loses 30 to 50 % productivity for 3 to 6 months.

B2B SaaS, 4 years old, 3 cofounders (CEO 35 %, CTO 30 %, COO 25 %), 10 % BSPCE pool. CTO wishes to leave at month 42 of the 48-month vesting. Last post-money valuation: EUR 25 m (Series A 6 months earlier).

Data:

• CTO vested: 42/48 = 87.5 % → 26.25 % of capital; unvested: 3.75 %.
• Total valuation EUR 25 m → CTO's vested portion is nominally worth EUR 6.56 m.

Good leaver scenario (amicable departure):

• buyback of vested portion (26.25 %) at market value with 25 % discount: EUR 25 m × 26.25 % × 0.75 = EUR 4.92 m;
• unvested portion (3.75 %) bought back at nominal value;
• staggered payment over 24 months: 50 % cash, 50 % vendor credit;
• CTO taxation: possible application of contribution-disposal to a personal holding, gain deferral (≈ EUR 4.5 m after acquisition cost) subject to 60 % reinvestment.

Bad leaver scenario (clear fault):

• buyback of vested portion at nominal or 80 % discount: EUR 25 m × 26.25 % × 0.20 = EUR 1.31 m;
• gap vs good leaver: EUR 3.6 m.

The EUR 3.6 m gap illustrates the qualification stake. This is precisely why the agreement must list motives precisely and anticipate arbitration in case of disagreement.

Three perspectives:

Perspective 1 — Buyback by the company vs by other shareholders. Buyback can be done by the company (capital reduction, art. L.225-204 et seq.), by remaining founders, or by investors. The choice has tax and accounting consequences: company buyback generates a merger profit / loss; shareholder buyback is neutral for the company but shifts the cap-table balance. The right choice depends on available cash and cap-table strategy.

Perspective 2 — Balance sheet impact. A company buyback at price > nominal value generates a decrease in equity equal to the price paid. An overly large capital reduction can weaken financial ratios vis-à-vis banks and investors. Anticipate the balance sheet impact before deciding the buyback vehicle.

Perspective 3 — Prior review of leaver's personal commitments. Bank guarantees, GAPD, comfort letters, asset and liability warranties given in client contracts: these personal commitments of the leaver must be inventoried and transferred or released before effective departure. Otherwise, the leaver remains personally exposed to risks they no longer control, source of subsequent litigation.

• Loosened good leaver case law — French Cour de cassation in 2024-2025 tends to recharacterise as good leaver amicable departures without clear fault, even with a broad bad leaver clause.
• Contribution-disposal under scrutiny — French tax authority tightens controls on reinvestment conditions (art. 150-0 B ter). Document rigorously.
• Non-compete clauses — since 2024, financial consideration required for post-mandate non-compete, otherwise null.
• Social media communication — a poorly communicated departure can be amplified on LinkedIn and X. Prepare a joint statement with the leaver.
• Round-in-progress case — if departure occurs during a round, some lead investors impose veto on buyback terms. Anticipate in the calendar.

How long does a well-managed cofounder departure take?

Between 6 and 14 weeks from internal decision to buyback closing. Shorter with a clear agreement, longer in case of contested qualification or contribution-disposal mechanism.

Can the leaving cofounder block the buyback?

If the agreement provides a unilateral call option on departure, no. Without an option, yes — hence the importance of signing it at day 1.

What discount applies in good leaver?

20 to 30 % off the last post-money is usual to reflect illiquidity. Above 30 %, drafting can be challenged by the leaver.

Should a non-compete clause be added at departure?

Yes, but with financial consideration (2024 case law). Typical duration 12 to 24 months, geographic scope limited to the company's current market, indemnity 30 to 50 % of last compensation.

Can the buyback be debt-financed?

Yes. Some BPI / banks finance share buybacks as part of cap-table unblocking pre-round. Typical security: pledge over bought-back shares.

A cofounder departure is neither a failure nor an irreversible rupture. It is a startup life event that is prepared upstream (agreement clauses) and managed downstream (9-step protocol, sequenced communication, optimised taxation). Companies that handle it badly pay in fundraising months and investor confidence. Those that handle it cleanly emerge stronger.

Our firm advises founders on drafting vesting and leaver clauses from incorporation, on valuation and tax structuring of the buyback, and on coordination with venture capital lawyers during an actual departure. For an audit of your setup or support during an ongoing departure, contact us via Legal advisory for businesses or Holding company taxation.

• French Commercial Code, articles L.227-13 to L.227-19 (SAS bylaws clauses) — Légifrance.
• French Commercial Code, articles L.223-13 et seq. (SARL share transfers) — Légifrance.
• French Tax Code, articles 150-0 A et seq. (capital gains regime) — Légifrance.
• French Tax Code, article 150-0 D ter (enhanced retirement-departure allowance) — Légifrance.
• French Tax Code, article 150-0 B ter (contribution-disposal and tax deferral) — Légifrance.
• Cour de cassation, commercial chamber — good leaver / bad leaver case law.
• Ordre des Experts-Comptables — share transfer documentation.

Up to date as of 1 May 2026.