Qualified Small Business Stock (QSBS) is a federal tax benefit under Section 1202 of the Internal Revenue Code. When it applies, it lets an eligible investor exclude some or all of the capital gain on qualifying startup stock from federal tax — one of the largest tax benefits available in venture investing.

Whether it applies to a return from a Seed Labs deal depends on facts about the portfolio company, the deal entity, and each individual investor. No single party can make that call on an investor's behalf. The determination is ultimately made by the investor and their CPA.

How Seed Labs deals fit into the picture

Deals on Seed Labs are structured as LLCs. For tax purposes, these LLCs are treated as partnerships — pass-through entities where all tax liability flows through to the members of the deal entity.

This matters for QSBS because Section 1202 benefits can pass through a partnership to its members. If the deal entity holds qualifying stock and sells it after the required holding period, eligible members may be able to claim the exclusion on their share of the gain — provided the company-level and investor-level tests below are met.

What has to be true at the company level

For the underlying stock to count as QSBS, the portfolio company generally must satisfy all of the following:

• Domestic C-corporation. LLCs taxed as partnerships and S-corps don't qualify.
• Original issuance. The stock must be acquired directly from the company — not bought secondhand — in exchange for cash, property, or services.
• Gross asset cap. The company's aggregate gross assets must sit under a statutory ceiling around the time of issuance: generally $50 million for stock issued before July 4, 2025, and $75 million for stock issued on or after that date (inflation-adjusted beginning in 2027).
• Active business requirement. During substantially all of the holding period, at least 80% of the company's assets (by value) must be used in the active conduct of a qualified trade or business.
• Not an excluded business. Certain industries are carved out entirely: professional services (health, law, accounting, consulting, financial and brokerage services, and similar), banking and insurance, farming, natural resource extraction, hotels and restaurants, and any business whose principal asset is the reputation or skill of its employees. Most product-focused software companies can qualify, but this is fact-specific.

What has to be true for the investor

Even when the stock itself qualifies, each member of the deal entity has their own hurdles:

• The investor was a member of the deal entity on the date it acquired the stock.
• The investor held their interest continuously from that date through the date the stock was sold.
• The investor is an eligible taxpayer. Individuals, trusts, and certain pass-through entities generally qualify; C-corporations do not.
• The exclusion only covers gain attributable to the interest held at the time of acquisition. If an investor increased their stake later, the added portion generally doesn't qualify.

A practical consequence: acquiring a deal interest via secondary transfer after the entity already owns the stock generally does not carry QSBS treatment with it. An investor selling their deal interest (rather than the entity selling the stock) generally doesn't qualify for the exclusion either.

How much gain can be excluded

The rules changed in 2025, so two regimes exist side by side depending on when the stock was acquired:

Acquired before July 4, 2025. Up to 100% of eligible gain can be excluded after a 5-year holding period (for stock acquired after September 27, 2010). The per-issuer cap is the greater of $10 million or 10x basis.

Acquired on or after July 4, 2025. A tiered schedule applies: 50% exclusion after 3 years, 75% after 4 years, and 100% after 5 years. The per-issuer cap rises to the greater of $15 million or 10x basis, inflation-adjusted starting in 2027.

Gain above the caps remains taxable, and other federal and state rules can still apply.

A note on SAFEs and convertible notes

QSBS applies to stock. For investments made via SAFEs or convertible notes, most advisors treat the QSBS holding period as starting when the instrument converts into equity — not when the investment was first made. The IRS hasn't issued definitive guidance on whether a SAFE itself can be treated as stock for Section 1202 purposes, so this is an area where individual analysis with tax counsel is especially important.

How Seed Labs checks eligibility

QSBS eligibility becomes relevant when there is a distribution — when the deal entity sells stock and returns gains to members. It is a determination made at distribution time, not at the time of investment.

When a distribution involves a potential QSBS position, GPs may request written confirmations from the portfolio company through a QSBS questionnaire template that Seed Labs generates. The company is asked to confirm, in substance:

1. The company is, and since the stock issuance date has remained, a domestic C-corporation.
2. The stock was acquired at original issuance — directly from the company in exchange for cash, property (other than stock), or services — not through a secondary purchase.
3. The company's aggregate gross assets were at or below the applicable statutory cap immediately before and immediately after the issuance: $50 million for stock issued before July 4, 2025, or $75 million for stock issued on or after that date.
4. Since the stock was issued, at least 80% of the company's assets (by value) have been used in the active conduct of a qualified trade or business.
5. At no point since issuance have securities or non-operating real estate made up 10% or more of the company's total asset value.
6. The company has not repurchased stock from its stockholders, outside of narrow exceptions (e.g., buybacks from departing employees and de minimis repurchases).

The questionnaire also records the company name, the stockholder of record, the issuance date, and the stock held immediately after issuance.

Don't forget state taxes

QSBS is a federal exclusion, and states choose whether to follow it. California, Pennsylvania, Mississippi, and Alabama do not conform — gain excluded federally is still taxable there. New Jersey begins conforming for tax years starting on or after January 1, 2026. Investors should confirm their state's treatment with their advisor.

Further reading

These articles might be helpful: What are the main QSBS requirements? and How QSBS Works for Limited Partners.

The bottom line

Every piece of this analysis — company qualification, continuity of ownership, holding periods, caps, state conformity — turns on the deal and the investor's specific facts. Given how specific each situation is, the determination of whether an investment is QSBS eligible ultimately falls within the realm of the investor's tax counsel at the time of the investor's tax filing season. Investors should work with their own CPA or tax advisor to decide whether and how to invoke QSBS for their investment.

Questions? Contact us at team@seedlabs.com.