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How to Draft a Delaware C-Corp Founder Stock Purchase Agreement With 4-Year Vesting and 1-Year Cliff

A Delaware C‑corp founder stock purchase agreement typically uses a 48‑month vesting schedule with a 12‑month “cliff,” meaning 0% vests until month 12 and then monthly vesting through month 48. This structure aligns founder incentives while allowing the company to repurchase unvested shares if a founder leaves early. This article walks through the key clauses, Delaware-law mechanics, and practical drafting tips attorneys should include.

Why a Founder Stock Purchase Agreement (FSPA) Matters in a Delaware C‑Corp

A Delaware C‑corporation usually issues “restricted stock” to founders at formation (or shortly after) and ties that stock to a vesting schedule. The core legal tool for doing this is a founder stock purchase agreement (often paired with a restricted stock purchase agreement) that: (1) documents the purchase/issuance of shares, (2) imposes vesting via the company’s repurchase right on unvested shares, and (3) sets forth tax and corporate formalities that investors expect.

For attorneys drafting for venture-backed or venture-backable startups, the market baseline is 4-year vesting with a 1-year cliff. Investors and accelerators frequently require it, and it provides a balanced mechanism to protect the company if a founder departs early while still rewarding long-term contribution.

How 4‑Year Vesting With a 1‑Year Cliff Works (Mechanics and Math)

“4-year vesting with a 1-year cliff” generally means:

Vesting term: 48 months total.
Cliff: 12 months—no shares vest before the 12-month anniversary of the vesting start date.
After the cliff: A typical pattern is monthly vesting of the remaining shares over months 13–48.

Common calculation example: A founder purchases 4,800,000 shares. Vesting begins on the founder’s start date. At month 12, 25% (1,200,000 shares) vests at once. The remaining 3,600,000 shares vest monthly over 36 months, i.e., 100,000 shares per month from month 13 through month 48.

Legally, the founder often becomes the record holder of all shares on day one, but the company holds a contractual repurchase option that allows it to repurchase unvested shares at the lower of cost or fair market value (FMV) upon a termination event, depending on drafting and tax considerations.

Core Structure: Documents Typically Included

Many Delaware startups use a document set rather than a single agreement. Your drafting may include:

Stock Purchase Agreement (purchase price, closing, reps, securities law legends)
Restricted Stock Agreement or Vesting Agreement (vesting schedule, company repurchase option)
IP Assignment and Confidentiality (often in a separate PIIA or in an invention assignment agreement)
83(b) Election Form (provided as an exhibit with instructions)
Board/stockholder consents approving issuance and form documents

Some practitioners fold these into one “Founder Restricted Stock Purchase Agreement.” Either approach can work as long as the vesting/repurchase and tax mechanics are unambiguous and board approvals are properly documented.

Key Clauses to Draft (and How to Draft Them)

1) Parties, Share Amount, and Purchase Price

Spell out: (a) issuer’s full Delaware legal name, (b) founder’s name, (c) number of shares, (d) class/series (usually Common Stock), and (e) per-share purchase price.

Practice point: For newly formed companies, founders often purchase at or near par value. Confirm that the price is consistent with the company’s capitalization, board determination of fair value, and any early valuation work. Even at formation, the board should expressly approve issuance terms to support corporate and tax defensibility.

2) Vesting Schedule Exhibit (4 Years / 1-Year Cliff)

Put the vesting schedule in a table attached as an exhibit. Include:

Vesting commencement date (often founder’s start date, not necessarily the incorporation date)
Cliff date (12-month anniversary)
Monthly vesting thereafter through month 48

Drafting tip: Define what happens in partial months (e.g., if employment starts mid-month) and clarify whether vesting occurs on the same day-of-month as commencement.

3) Company Repurchase Option (the Enforcement Mechanism)

In restricted stock arrangements, vesting is typically implemented via the company’s contractual right to repurchase unvested shares upon a “Triggering Event” (commonly termination of service, sometimes including voluntary resignation).

Important drafting decisions:

Scope: Repurchase right applies to “Unvested Shares” (defined precisely).
Exercise window: Company has X days (often 90 days) after the triggering event to elect repurchase.
Repurchase price: Commonly the founder’s original purchase price. Some agreements use the lower of cost or FMV; be careful about tax and fairness optics.
Payment terms: Cash, promissory note, or netting against amounts owed; specify timing and interest if any.

Delaware law note: Ensure the corporation has authority under its charter and Delaware General Corporation Law (DGCL) to repurchase shares and that the repurchase won’t impair capital. Board approval and solvency considerations should be addressed in consents and company procedures.

4) “Service” Definition and Termination Events

Vesting should be tied to “Continuous Service” and define what counts: employment, consulting, board service, or officer service. Clarify:

Whether unpaid leave pauses vesting
What happens upon conversion from employee to consultant
How disability, death, or termination without cause is treated

Consistency check: Align definitions with the company’s equity plan (if one exists), employment/offer letters, and any proprietary information agreements.

5) Acceleration (If Any): Single-Trigger vs. Double-Trigger

Founders sometimes request acceleration upon a change in control. Investors often resist broad single-trigger acceleration. If acceleration is included, draft it carefully:

Single-trigger: Vesting accelerates upon change in control.
Double-trigger: Vesting accelerates only if a change in control occurs and the founder is terminated without cause (or resigns for good reason) within a defined period.

Market approach: Double-trigger is more common in venture-backed deals. If adding acceleration, specify the percentage accelerated (e.g., 25% or 50%), the protected period (e.g., 12 months), and what constitutes “Cause” and “Good Reason.”

6) Section 83(b) Election Language and Founder Instructions

For restricted stock subject to repurchase, founders usually file an 83(b) election to recognize income at purchase rather than as shares vest. Without an 83(b), a founder may owe ordinary income as vesting occurs—potentially at higher valuations later.

Drafting essentials:

Include a covenant that the founder will file an 83(b) within 30 days of the stock transfer.
Attach a form of 83(b) as an exhibit and include mailing instructions.
Include an acknowledgment that the company is not providing tax advice.

Practice tip: Many disputes arise because founders miss the 30-day deadline. Consider adding an internal “closing checklist” requiring proof of mailing/filing and retention in the company’s records.

7) Securities Law Compliance and Legends

Even early founder issuances should include securities law representations and legends, including:

Investment intent and accredited status (as applicable)
Restricted securities legend referencing the Securities Act of 1933
Transfer restrictions under the charter, bylaws, or stockholders’ agreement

Although founder issuances often rely on private offering exemptions (e.g., Regulation D/Section 4(a)(2)), your documentation should still support the exemption through proper disclosures and representations.

8) Transfer Restrictions and Company Right of First Refusal (ROFR)

Vesting handles unearned equity, but you also want to control transfers of even vested shares. Include:

Prohibited transfers without board consent
Company ROFR on proposed transfers (and sometimes co-sale rights for other stockholders)

Integration point: If the company expects to adopt a standard Stockholders’ Agreement later, ensure the FSPA either includes interim ROFR terms or requires founders to sign the later agreement as a condition.