QSBS §1202: How Bay Area Tech Founders Can Exclude $10M+ of Gain

For Bay Area tech founders, IRC §1202 — Qualified Small Business Stock — is the single most valuable tax provision in the U.S. code. Founders and early employees of qualifying C-Corp startups can exclude up to $10M (or 10× original basis) of capital gain from federal tax after a 5-year hold. For a founder selling $10M of QSBS-qualifying stock, that’s a $2.38M federal tax savings. Stack across spouse, irrevocable trusts, and family members and the per-issuer cap multiplies. This guide walks through the eligibility tests, the 2025 OBBBA tiered exclusion, the California non-conformity trap, and the planning moves that determine whether your founder stock qualifies — moves that must happen at incorporation, not at exit.

The §1202 Exclusion: How It Works

Under IRC §1202(a), a non-corporate taxpayer can exclude 100% of capital gain on the sale of “Qualified Small Business Stock” (QSBS) held more than 5 years. The exclusion is capped per issuer at the greater of (a) $10M of cumulative gain or (b) 10× the taxpayer’s aggregate adjusted basis in QSBS of that issuer.

For founders with low basis (say, $1,000 at incorporation), the $10M cap controls. For taxpayers who invested significant capital (a $5M Series A investor), the 10× cap can yield up to $50M of exclusion. Both caps apply per issuer, so an investor across multiple QSBS-qualifying companies can multiply the benefit.

Who Qualifies as a Qualified Small Business

The issuing entity must meet four core tests:

1. Domestic C-Corporation: LLCs, S-Corps, and partnerships are not eligible. An LLC that converts to C-Corp can become QSBS-eligible going forward, but the prior period stock interest does not retroactively qualify.

2. Gross Assets ≤ $75M at any time from inception through immediately after stock issuance. The 2025 OBBBA raised this from $50M to $75M, expanding eligibility for later-stage Series A/B companies.

3. Active Trade or Business: At least 80% of corporate assets used in a qualified trade or business. Tech, software, biotech, manufacturing, and most product/services qualify. Specifically disqualified: most professional services (law, accounting, health, consulting), financial services, hospitality, farming, mining.

4. Original Issuance: Stock must be acquired at original issuance from the company in exchange for money, property, or services. Secondary purchases (buying stock from another shareholder) do not qualify.

Holding Period	Federal Gain Exclusion	Effective Federal Rate on $1M Gain
< 3 years	0% — full LTCG applies	23.8% ($238K)
3 to 4 years (OBBBA)	50%	~11.9% ($119K)
4 to 5 years (OBBBA)	75%	~6% ($60K)
5+ years	100%	0% ($0)

The California Non-Conformity Trap

California does not conform to IRC §1202. The Franchise Tax Board treats QSBS gain as fully taxable California capital gain at the state’s ordinary income rates (up to 13.3% including the Mental Health Services tax). For a Bay Area founder with $10M of QSBS gain, this is roughly $1.3M of state tax — even with full federal exclusion.

Some California founders pre-plan a California residency change before sale. The Franchise Tax Board scrutinizes “convenient” moves to Nevada, Texas, or Washington aggressively. A 2-year pre-sale move (not just before LOI signing) is the practical minimum, with documented severance from California ties — vehicle registration, primary residence, voter registration, and ideally physical presence.

Stacking the Cap: Trusts, Spouses, and Family

The $10M per-issuer cap applies per taxpayer. Strategic planning can multiply the cap:

Spouse: Each spouse has a separate $10M cap. A founder gifting QSBS to a spouse before the 5-year mark doubles the family cap to $20M.

Irrevocable Non-Grantor Trusts: Each non-grantor trust is a separate taxpayer with its own $10M cap. Sophisticated founders create multiple trusts (one per child, one per intended beneficiary) to multiply caps.

Family Limited Partnerships can allocate QSBS gain among multiple partners, each accessing their own cap.

These structures must be funded with QSBS gifts before the holding period clock runs out — and the trust must satisfy specific IRS requirements to be respected as a separate taxpayer.

A Bay Area founder with $30M of QSBS gain who has stacked across spouse, three children’s non-grantor trusts, and a family LP can potentially exclude $50M+ of gain — saving $12M+ in federal tax. The structures must be in place years before the exit; retrofitting at LOI signing is too late.

The 2025 OBBBA Changes

The One Big Beautiful Bill Act of 2025 made three significant changes to §1202:

1. Tiered exclusion: 50% at 3 years, 75% at 4 years, 100% at 5 years. Previously the holding period was binary — under 5 years you got nothing, at 5 years you got 100%. The tiered structure helps founders facing earlier exits (acquisitions, secondary tenders).

2. Gross assets threshold: Raised from $50M to $75M, indexed for inflation going forward. This expands eligibility for many Series A/B startups.

3. Per-issuer cap: Raised from $10M to $15M for stock issued after July 4, 2025 (with the 10× basis cap still applicable). Pre-OBBBA stock retains the $10M cap.

Common QSBS Mistakes That Cost Millions

• S-Corp at inception: A startup that elects S-Corp tax treatment to “save on FICA” disqualifies all future stock from QSBS. The most expensive cost-saving move a Bay Area founder can make.
• LLC delays: Founders who operate as an LLC for 18 months “to figure things out” lose 18 months of QSBS holding period when they convert to C-Corp.
• Gross asset spikes: A Series A round that pushes gross assets above $75M before stock issuance disqualifies the stock issued. Careful timing of issuance vs. funding is critical.
• Service-business disqualification: Some tech companies cross into “consulting” or “professional services” territory. The IRS has aggressively challenged certain professional services pivots.
• Redemption traps: Stock redeemed by the issuing company within certain windows can disqualify other shareholders’ QSBS. Founder secondary tenders need careful structuring.

Frequently Asked Questions

My startup is an LLC. Can I still get QSBS treatment?

Not on LLC interests. You’d need to convert to a C-Corp to start the QSBS clock. The conversion itself doesn’t retroactively qualify pre-conversion interest, but post-conversion stock can become QSBS-eligible. We coordinate the conversion with corporate counsel and time it to minimize disruption to the cap table.

I’m a startup employee with vested ISOs. Do those qualify?

Stock acquired through ISO exercise can qualify for §1202 if all other tests are met — the holding period for §1202 starts from the date of stock acquisition (exercise), not grant. Note this is different from the long-term capital gains holding period from grant date for ISO favorable tax treatment.

Can I do anything if I’m past the 5-year mark and the company hasn’t exited?

Yes — you already have QSBS treatment locked in. Continue monitoring the per-issuer cap as the company’s value grows. Some founders take strategic secondary sales at the $10M cap to reset basis if eligible new investments occur.

Does §1045 rollover help if I sell early?

Yes. IRC §1045 lets you roll QSBS gain into new QSBS within 60 days, tacking the prior holding period. Useful for founders selling Company A QSBS at year 3 and re-investing into Company B startup — the combined 5-year hold can satisfy §1202.

This article is for general information and does not constitute tax, legal, or investment advice. Individual situations vary; please consult a CPA before making tax elections. Milestone CPAs is licensed in California and serves clients across the Bay Area and Tri-Valley.