Founder tax planning

QSBS can eliminate the federal tax on your founder exit — if the stock qualifies.

Section 1202 of the Internal Revenue Code lets a founder or early investor exclude up to $15 million of gain per company from federal income tax entirely, provided the stock meets a set of requirements at issuance and is held long enough. The One Big Beautiful Bill Act (OBBBA), enacted July 2025, raised the exclusion cap, raised the gross assets ceiling, and added a tiered holding structure. For founders whose stock qualifies, QSBS is one of the most valuable tax benefits in the code.

This guide explains the current rules, what disqualifies stock that founders often assume is covered, and the practical steps to protect the exclusion from the day you receive your shares.

Pre-OBBBA vs. post-OBBBA rules at a glance

The rules that apply depend on when the stock was issued, not when you sell it.

The five qualification requirements

1. C-corporation — not S-corp, LLC, or LP

Only stock in a domestic C-corporation qualifies.¹ S-corporations, LLCs taxed as partnerships, and limited partnerships do not issue QSBS. Many early-stage startups incorporate as C-corps specifically for this reason. If you are a founder in an LLC operating company that converts to a C-corp later, shares issued before conversion generally do not qualify; shares issued after conversion in exchange for your interest may qualify if the other tests are met on the reissuance date.

2. Original issuance — must come directly from the company

The stock must be acquired at original issue directly from the corporation in exchange for money, property (other than stock), or services.¹ This means you cannot buy founder QSBS on a secondary market and get the benefit. Shares acquired in a secondary transaction — even at seed prices — are not QSBS for the buyer. The original founder's basis in shares received for services may qualify; the investor who buys the same shares on Forge three years later does not.

3. Gross assets test — the company must be small enough at issuance

The corporation's aggregate gross assets must not exceed $75 million immediately after issuance of the shares.¹ "Aggregate gross assets" means cash plus the adjusted tax basis of other property the company holds — essentially the book value of what the company has received, not FMV or the implied enterprise value from a VC term sheet.

This threshold applies at the moment your shares are issued, not at exit. A company whose gross assets are $60 million the day you receive your seed-round shares can still issue QSBS even if it later raises $200 million and is worth $2 billion. Conversely, a company that takes in a $100M Series B before issuing your co-founder shares has already crossed the threshold — your shares will not qualify.

Practically, most seed and Series A grants qualify easily. Series B and later grants require a check. Note that cash raised in a financing round increases gross assets immediately at close, so shares issued in a large round may fail the test even if prior shares qualified.

4. Active qualified trade or business — not all businesses qualify

At least 80% of the corporation's assets must be actively used in a "qualified trade or business" for substantially all of your holding period.¹ Section 1202(e)(3) explicitly excludes several industries from qualified status:

• Health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage services.
• Any trade or business where the principal asset is the reputation or skill of one or more employees.
• Banking, insurance, leasing, financing, investing, or similar businesses.
• Farming, extractive industries (oil, gas, minerals), and hospitality businesses running hotels or restaurants.

Most software, SaaS, hardware, biotech, and technology companies qualify. A legal tech company that licenses software qualifies; a law firm that happens to build a billing app probably does not — the distinction depends on what the company primarily does and what its assets primarily support. Hybrid businesses with some excluded-industry revenue can still qualify if the active use test is satisfied based on asset allocation.

5. Holding period — at least three years for any exclusion

Under the OBBBA tiered structure (for stock issued after July 4, 2025), you can access partial exclusions before five years:²

• 3 years: 50% of gain excluded from federal tax.
• 4 years: 75% of gain excluded.
• 5 years: 100% of gain excluded.

The holding period begins at the acquisition date — which is why the 83(b) election matters so much. Without an 83(b) election, each vesting tranche is treated as acquired on its own vest date. A founder on a four-year vest who misses the election may have shares in the final cliff tranche that don't hit the five-year threshold until nine years after founding, and may have paid ordinary income tax on all the gain that QSBS would have sheltered along the way.

How the $15M cap works in practice

The $15 million exclusion cap (or 10× basis, whichever is greater) applies per taxpayer per issuer. A co-founder with 5,000,000 shares bought at $0.0001 each — $500 adjusted basis — can exclude the greater of $15M or $5,000 of gain. For nearly all founders, the flat $15M number is the binding limit.

The 10× rule matters when adjusted basis is large: an angel who paid $2 million for shares at a Series A price can exclude up to $20 million of gain on those shares. But for founding-day shares at par value, the 10× calculation is usually irrelevant.

Per-taxpayer, per-issuer means each co-founder gets a separate $15M exclusion, and each company you hold stock in is a separate calculation. A repeat founder with qualifying stock in two different companies can potentially exclude $30M across the two exits. A married couple who each own qualifying shares can each claim the $15M limit on their respective shares, for a potential $30M combined on a single company — but only if each spouse holds shares in their own name, not jointly.

The 83(b) election is the prerequisite

The QSBS holding period starts at the acquisition date of the stock. For restricted shares subject to vesting, the IRS treats each vesting tranche as a separate acquisition — meaning the QSBS clock on your final cliff shares doesn't start until they vest, not when you joined the company.

Filing a timely 83(b) election fixes this: the entire position's acquisition date becomes the date of grant, so the QSBS clock starts at founding for all your shares. This is the most time-sensitive decision in founder stock planning. You have 30 days from the transfer date, and the IRS grants no extensions.

The QSBS holding period and the 83(b) election work together. The election addresses ordinary income at vesting; QSBS addresses capital gain at exit. You generally need both to fully protect a successful founder exit from federal income tax.

The California problem

California does not conform to Section 1202.⁴ California Revenue and Taxation Code §18152 explicitly excludes the federal QSBS exclusion from California income tax treatment. A California founder who qualifies for a $15M federal exclusion on a $20M exit still owes California income tax on the full $20M gain, at a top rate of 13.3%. On a fully federally excluded $15M gain, that's approximately $2M in California tax alone — on income the federal government didn't touch.

This is not a loophole or a gray area. It is the explicit California position, and the FTB actively applies it. Founders who have heard that "QSBS is tax-free" are sometimes surprised to discover they owe a seven-figure state tax bill.

Other states that do not conform to Section 1202: Alabama, Mississippi, and Pennsylvania. New Jersey recently enacted conformity effective January 1, 2026.⁴ State treatment varies and changes; verify the current rules for your state of residence and the state where the company operates before assuming the exclusion applies at the state level.

Stacking strategies

Because the exclusion is per taxpayer per issuer, there are legitimate planning structures founders and advisors use to increase the available exclusion:

• Spousal allocation: Spouses who each hold qualifying shares separately (not jointly) each have a $15M exclusion. Early planning to allocate shares to each spouse, if consistent with marital property rules and your company's cap table, can double the available exclusion for a married couple.
• Trust structures: Certain non-grantor trusts and irrevocable trusts that hold QSBS may have their own $15M exclusion limit separate from the founder's individual limit. This is structurally complex and requires careful planning before the shares are transferred, since the original-issuance requirement means shares can sometimes be transferred to eligible entities post-issuance while preserving QSBS status, but only if the transfer qualifies under §1202(h).
• Gift and inheritance: QSBS can be transferred by gift or at death without losing its qualified status, provided the transferee would otherwise qualify as an eligible stockholder. The QSBS holding period of the original owner generally carries over to the recipient, which matters for reaching the five-year threshold.

These strategies are not plug-and-play. They involve coordination with company counsel on transfer restrictions, estate counsel on trust drafting, and a tax advisor to model the actual exclusion outcome before and after the structure. The planning window is usually narrow: it must happen before the first meaningful liquidity event for stacking to provide full value.

AMT — no longer the issue it once was

Before the Tax Cuts and Jobs Act of 2017, 7% of the excluded QSBS gain was an alternative minimum tax preference item, which created an effective minimum tax on the exclusion. TCJA removed this preference for QSBS, so the federal exclusion is now clean — a 100% QSBS exclusion creates no federal AMT exposure. The California AMT (which follows federal AMT structure for some purposes but not for QSBS) is a separate matter and does not change the core California ordinary-income exposure described above.

When to start planning

QSBS qualification depends on facts established at issuance, not at exit. The gross assets test, C-corp status, and original-issuance requirement are all determined on the day shares are issued. The 83(b) election must be filed within 30 days of that same date. The holding period starts that day.

The founding day is also when planning has zero cost — there is no gain, no cash at risk, and no urgency from an investor or board. Founders who start the QSBS conversation at term-sheet stage, or after signing an acquisition LOI, are working with what the past allowed rather than structuring for what the future requires.

Practically: retain counsel for your stock documents, file the 83(b) within 30 days, confirm your company meets the C-corp and active business requirements at grant, and schedule a conversation with a founder-specialist tax advisor before your company approaches the $75M gross assets ceiling. That conversation costs far less than discovering a qualification failure after the wire transfer.

Startup Founder Advisor Match is a referral service, not a law firm, broker-dealer, or registered investment adviser. We may receive compensation from professionals in our network. Content is for informational purposes only and does not constitute legal, tax, investment, securities, or individualized financial advice. Coordinate founder stock decisions with company counsel, personal counsel, CPA, board-approved processes, and other professional advisors.