Founder Equity: 83(b) Elections, QSBS, and Early Exercise

A founder who receives restricted stock at incorporation has 30 days to make an 83(b) election, or the tax consequences over the following decade become significantly worse. A founder whose company is incorporated as a C-corp rather than an LLC preserves the possibility of the §1202 QSBS exclusion, worth up to $10M of federally tax-free gain per founder per issuer at exit. A founder whose grant documents permit early exercise plus 83(b) can lock in long-term capital gain treatment on future appreciation.

These three decisions, all made in the first month, determine whether the founder’s eventual exit generates $2M of tax on a $10M sale or $0 of federal tax. The time value of getting them right is enormous. The cost of getting them wrong is mostly invisible for years, then shows up at the wrong moment.

This guide covers the three moves in order, the mechanics of each, and the common mistakes that break eligibility.

The 83(b) election on founder restricted stock

A founder receiving shares subject to vesting (a reverse vesting schedule, typically 4 years with 1-year cliff) has 30 days from the date of acquisition to file an 83(b) election with the IRS. Failure to file within the 30-day window is not curable.

What the 83(b) does. Without it, each vesting event is a taxable event: the founder recognizes ordinary income equal to the fair market value of the shares that vest, minus what was paid. With it, the founder recognizes ordinary income (usually zero, because at incorporation FMV equals purchase price) at the grant date and starts the capital-gains clock immediately.

For a typical founder who pays $100 for 10 million shares at incorporation, the FMV equals the purchase price, the spread is zero, and the 83(b) locks in ordinary income of zero. Four years later, when those shares are worth $10M, the entire $10M gain is capital, not ordinary. Without the 83(b), each year’s vested chunk would have been ordinary income at the then-FMV, potentially generating tens of millions in ordinary income tax over the four years.

Filing mechanics. Prepare a written 83(b) election statement with the taxpayer’s name, the property description, the date of transfer, the FMV at transfer, the amount paid, and a signed declaration. Mail to the IRS office where the taxpayer files returns, within 30 days of the transfer. Certified mail with return receipt is standard practice. Keep the green card forever. Attach a copy to that year’s Form 1040.

The 30-day clock is absolute. No extensions, no cure period, no hardship exception. The IRS has been extremely strict on enforcement. A single missed election on founder stock has cost founders eight-figure tax bills.

QSBS preservation and C-corp structure

Qualified small business stock under IRC §1202 excludes up to the greater of $10M or 10x basis of gain on sale if the holder acquired the stock at original issuance from a qualifying C-corporation and held it for more than five years.

Requirement 1: C-corporation. LLCs and partnerships do not produce QSBS. Founders who incorporate as an LLC for early simplicity then convert to a C-corp later restart the QSBS clock at conversion. The pre-conversion holding period does not tack. Founders who expect to need QSBS at exit should incorporate as a C-corp from day one.

Requirement 2: Gross assets under $50M at issuance. Most founder stock qualifies because it is issued at or near incorporation when assets are minimal. Subsequent rounds that push the company above $50M of gross assets disqualify only new issuances; previously issued stock remains QSBS. This is another reason to issue founder shares early.

Requirement 3: Qualified trade or business. Tech and software generally qualify. Professional services (law, accounting, consulting heavy on individual reputation), financial services, hospitality, farming, and a few other industries are excluded under §1202(e)(3). A fintech with a banking license may face scrutiny; a pure software company does not.

Requirement 4: Active business use of 80% of assets. The company cannot be predominantly a holding company or passive investor. Operating tech companies almost always satisfy this.

Requirement 5: Held more than five years at disposition. The clock starts at acquisition. For a founder receiving stock at incorporation, the clock starts then. An acquisition exit within five years breaks QSBS unless a §1045 rollover is executed (discussed below).

Early exercise and the founder’s option grant

Some founders receive additional grants as options after the initial founder shares. Employee #1, #2, and #3 often receive similar option grants. If the plan permits early exercise, exercising unvested options plus filing 83(b) produces the same benefit as the founder shares: ordinary income fixed at the tiny exercise-date spread, capital-gain clock running from the exercise date.

Cash outlay for early exercise equals strike price times shares. For a founder with 500,000 options at $0.01 strike, that is $5,000 of cash. For an early employee with 200,000 options at $0.50 strike, it is $100,000. The cash is at risk if the company fails, but §1244 small business stock rules can convert the loss to ordinary (up to $50k single, $100k joint per year).

The 83(b) must be filed within 30 days of the exercise date, not the grant date. This is a common point of confusion. A founder who early-exercises 500,000 shares of options on January 15 has until February 14 to file, regardless of when the option was originally granted.

Combined with QSBS, an early-exercised-plus-83(b) share structure gives the founder a capital-gain clock starting from exercise and a QSBS clock starting from exercise (if the company is a C-corp with gross assets under $50M at that exercise). Five years later, both clocks mature together, and the entire gain is both long-term and QSBS-eligible.

Founder secondaries and the QSBS holding period

Before the five-year mark, a founder who needs liquidity has three options: wait, sell and pay capital gains tax on the excess above exclusion, or use §1045 rollover.

§1045 rollover. Sell QSBS before the five-year hold, roll the proceeds into new QSBS within 60 days, and the replacement stock tacks onto the original holding period. A founder who sells in year three and reinvests the proceeds in another qualifying small business needs to hold the replacement for only two more years before the combined holding period matures.

The replacement investment must be genuinely QSBS. Self-rollover into your own company’s follow-on round is not allowed (the issuer has to be different). QSBS-focused funds exist to facilitate §1045 rollovers for founders in this position.

Partial sales are permitted. Selling half of the QSBS position before year five is fine; you lose QSBS on the sold portion but retain it on the unsold portion.

Founder secondary tenders (where the company runs a program to buy out a portion of founder shares at a liquidity event) are QSBS-eligible sales if the holding period is met and the seller is the original holder. Proceeds above the $10M cap are taxed at standard capital-gain rates.

QSBS stacking for founders with large positions

Founders whose expected exit value exceeds $10M per person face a concentration of gain above the exclusion cap. Stacking the exclusion across multiple taxpayers multiplies the effective cap.

Mechanics. Gift QSBS shares to non-grantor trusts before the liquidity event. Each trust is a separate taxpayer with its own $10M exclusion. A founder with four well-structured trusts effectively has four stacks, plus the founder’s own, for a combined $50M of excludable gain.

Requirements. Trust must be non-grantor (income taxed to the trust, not the grantor). Gift must be a completed gift for federal gift-tax purposes, which requires ceding all control. Gift-tax consequences: transfer uses lifetime exclusion ($13.99M per donor in 2025) or triggers gift tax at 40%.

Timing. The gift should occur well before any sale discussion to avoid step-transaction arguments. Gifts made one week before a tender or acquisition are subject to IRS challenge that the trust was not the real seller.

Non-grantor trust setup. Requires an independent trustee (not the grantor or grantor’s spouse), a non-resident or irrevocable structure with defined beneficiaries, and careful drafting to avoid triggering grantor-trust status under §§671-679.

Execute with a trust and estates attorney who has done QSBS stacking specifically. The potential savings (e.g., 23.8% federal of $40M of stacked exclusion = $9.52M) justify senior-level legal work.

Frequently asked

What if I miss the 30-day window on my 83(b)? The election is invalid. You recognize ordinary income at each vesting event on the then-FMV minus what you paid. There is no cure, no waiver, and no retroactive election. Some founders have made structured arguments around defective transfers to reset the clock; these are fact-specific and rarely succeed.

Does my co-founder need to file a separate 83(b)? Yes. 83(b) is per-taxpayer. Each founder files their own election for their own shares.

What if I incorporated as an LLC first? You can convert to C-corp. The conversion itself is typically tax-free under §351 (contribution to a controlled corporation), but the QSBS clock restarts at conversion. Any pre-conversion holding does not count. This is why the conventional founder advice is C-corp from day one unless you have a specific reason (pass-through losses early, for example) for the LLC structure.

Can I claim QSBS on my co-founder’s shares if they gift them to me? Gifts of QSBS preserve QSBS status in the hands of the donee, including the tacked holding period, under §1202(h)(2). But the donee’s exclusion is still $10M per issuer, and if the donor has already used some of their exclusion, that portion does not transfer.

Does my spouse get a separate $10M cap? If the spouse acquired QSBS directly from the issuer, they have their own cap. Transfers between spouses are typically treated as gifts that tack, so shares gifted from one spouse to the other do not create an additional stack.

Next step

If you are about to incorporate, pause and verify three things: the entity is a C-corporation, the founder restricted stock includes a reverse-vesting schedule (so an 83(b) makes sense), and your attorney has put the 83(b) form in your calendar for the 30-day window. The founder setup checklist walks through each step. This is a moment where an hour of the right attorney’s time saves seven figures ten years later.