QSBS: Does My Stock Qualify, and What Does It Mean for My Exit?

What QSBS is and what the exclusion is worth

Section 1202 says that if you hold qualifying stock in a qualifying company for long enough, you can exclude some or all of your gain on sale from federal income tax. The exclusion is not unlimited. It is capped, per taxpayer, per company, at the greater of a flat dollar amount or ten times your aggregate adjusted basis in the stock you sold that year.

Both the flat cap and the exclusion percentage depend on when you acquired the stock. This is the part people get wrong. Stock acquired in different eras is governed by different rules, and the rules were amended again by the 2025 federal tax legislation. In broad strokes:

• Stock acquired in the earliest years of the provision received a partial exclusion — 50%, later 75%, depending on the acquisition window.
• Stock acquired after September 27, 2010 and on or before July 4, 2025 generally qualifies for a 100% exclusion, subject to a flat cap of $10 million or the 10x-basis alternative, with a five-year holding period.
• Stock acquired after July 4, 2025 falls under a tiered structure: a partial exclusion at three years, a larger partial exclusion at four years, and a full exclusion at five. The flat cap for this stock is higher — $15 million — with inflation indexing scheduled to begin in a later year.

The exact percentages, dollar figures, and dates must be confirmed against current law before you rely on them. That is not boilerplate. These numbers have moved three times in fifteen years.

One more point people miss: the portion of gain that is not excluded does not simply get the normal long-term capital gains rate. Section 1202 gain that remains taxable is generally subject to a higher federal rate, and net investment income tax may apply on top. Partial exclusion is meaningfully less than half as good as it sounds.

The tests the company must meet

Four conditions, all of which are the company's problem, not yours — which is exactly why you should verify them rather than assume.

Domestic C corporation. The issuer must be a U.S. C corporation, and it must be a C corporation at the time the stock is issued and generally throughout your holding period. LLCs and S corporations do not issue QSBS. Neither do foreign entities.

Qualified trade or business. Section 1202 names a long list of excluded industries. Health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage services are out. So is any business whose principal asset is the reputation or skill of its employees. Banking, insurance, financing, leasing, and investing are out. So are farming, mining and other extraction, and hotels, motels, and restaurants. Software, biotech, manufacturing, and most product businesses are generally in — but "consulting" and "reputation or skill" are argued more often than founders expect, and services-adjacent companies should get a written opinion rather than a shrug.

Active business test. At least 80% of the company's assets, by value, must be used in the active conduct of the qualified business during substantially all of your holding period. A company sitting on a large investment portfolio, or holding real estate not used in operations, can fail this. Reasonable working capital counts as an active asset, but there are limits on how long that grace runs.

Gross assets test. The company's aggregate gross assets must have stayed at or below a statutory ceiling at all times before the stock was issued and immediately after. The ceiling was $50 million for stock issued on or before July 4, 2025 and rose to $75 million for stock issued after that date, with indexing scheduled later. Assets are measured using adjusted tax basis, except that contributed property counts at fair market value. Once a company crosses the ceiling, stock issued after that point is not QSBS — but stock issued before it remains eligible. This is why very early shares often qualify and later rounds do not.

The tests you must meet

Original issuance. You must have acquired the stock directly from the company, not from another shareholder. Secondary purchases do not produce QSBS. This is the most common single disqualifier among executives who bought into a company late.

Permitted form of acquisition. Stock issued for cash, for property other than stock, or as compensation for services all qualify. Founder shares issued at formation, stock purchased in a priced round, and stock issued on exercise of a compensatory option are all typically fine.

Non-corporate holder. Individuals, trusts, estates, and partnerships can hold QSBS. C corporations cannot claim the exclusion.

Holding period. Five years for full exclusion under every version of the rules. Under the post-July 2025 regime, three and four years produce partial exclusions.

The clock, and what starts it

The clock starts when you acquire the stock — not when you were granted an option, and not when you signed a note.

That distinction is expensive. An option holder's clock does not begin until exercise. A convertible note or SAFE investor's clock does not begin until conversion into stock. A warrant holder's clock begins at exercise. Restricted stock that is subject to vesting generally starts the clock at vesting unless a timely Section 83(b) election was filed, in which case it starts at grant. Founders who filed 83(b) elections at formation are usually in good shape. Executives holding vested-but-unexercised options five years into their tenure have a zero-day holding period.

How QSBS gets destroyed by accident

Redemptions. Section 1202 contains anti-churning rules that are unforgiving. A redemption from you or a related person within a window surrounding your issuance can disqualify your shares. A "significant redemption" — a buyback exceeding a small percentage of the company's total stock value within a window around issuance — can disqualify every share issued in that window, including shares held by people who had nothing to do with the buyback. There are de minimis exceptions for very small amounts. Employee tender offers, founder liquidity programs, and departing-cofounder buyouts routinely trip these rules, and nobody notices until diligence.

Entity conversions. Converting an LLC or S corporation to a C corporation can create QSBS — but only prospectively. The clock starts at conversion, and the gross assets test is measured with contributed property at fair market value, which can push a growing company over the ceiling on day one. Conversion also does nothing for appreciation that accrued before it.

Losing C corporation status. An S election filed at any point during the holding period is a problem.

Drifting out of the active business test. A company that raises a large round and parks the proceeds, or that pivots into an excluded line of business, can fail the 80% test for a period. "Substantially all" is not "always," but it is also not "sometimes."

What happens in the acquisition

Cash stock sale. The cleanest outcome. You dispose of QSBS, and if you have met the holding period, the exclusion applies up to your cap.

Asset sale. Generally the worst outcome for a QSBS holder. The company sells its assets and recognizes gain at the corporate level; you receive a liquidating distribution. Section 1202 excludes gain on the sale of stock, and an asset sale does not produce that. Structure is worth real money here, and buyers often prefer asset treatment for their own reasons. This is a negotiation, not a fact.

Stock-for-stock merger. Under Section 1202(h)(4), if you exchange QSBS for acquirer stock in a qualifying reorganization, the replacement stock is generally treated as QSBS with a tacked holding period — but your excludable gain is typically frozen at the built-in gain that existed on the closing date. Appreciation in the acquirer's stock afterward is fully taxable. If you roll equity into a large public acquirer, know that number before you sign.

Section 1045 rollover. If you have held QSBS more than six months but have not reached five years, Section 1045 lets you defer gain by reinvesting the proceeds in replacement QSBS within 60 days of sale, with the original holding period tacking onto the new shares. The election is made on a timely filed return and is difficult to unwind. Sixty days is not long, and identifying qualifying replacement stock is the hard part.

Planning structures that exist

Several approaches show up in this area. We describe them because you will hear about them, not because they are recommendations.

Gifting. QSBS transferred by gift generally carries its character and holding period to the recipient, and each non-corporate holder has their own per-issuer cap. Some families gift shares to adult children before an exit.

Non-grantor trusts. A properly structured non-grantor trust is a separate taxpayer with its own cap. Practitioners refer to using multiple trusts as "stacking." The IRS has anti-abuse authority in this area, the structures must be genuine and funded well before a sale is imminent, and the estate, gift, and administrative consequences are permanent.

Timing around the caps. Because the cap is the greater of the flat amount or 10x basis, shareholders with high basis sometimes have far more headroom than they assume.

None of this works if executed during a signed deal. All of it requires counsel.

Documentation and who to coordinate with

Start assembling this before diligence, not during:

• Your stock purchase agreement, option grant and exercise records, and any Section 83(b) election with proof of filing
• The company's certificate of incorporation and any conversion documents, with dates
• Capitalization tables at each issuance date
• Company balance sheets showing gross assets at and around each issuance
• Records of every redemption or buyback the company has done
• A QSBS attestation letter from the company — a written statement, usually prepared by company counsel and its accountants, confirming that the corporate-level tests were met as of your issuance date. Request it early. Once a deal closes and the company is absorbed, the people who can produce it scatter.

Coordinate your tax counsel or CPA, company counsel, your estate attorney if trusts are in play, and your wealth advisor. The advisor's role is to make sure the tax answer and the life answer are the same answer.