The Five Tests
All five have to be satisfied. They are listed here in the order that usually settles the question fastest — most sellers who do not qualify fail one of the first three, and knowing that in an afternoon is better than a month of analysis.
A domestic C corporation issued the stock
Not an LLC, not a partnership, not an S corporation. This is the most common disqualifier among owner-operated businesses, because the pass-through structures that minimize tax while you operate are the ones that cannot produce QSBS when you sell. Converting to a C corporation later does not retroactively qualify the years before it, and the holding clock starts at conversion.
You acquired it at original issuance
The stock has to have come from the company itself, in exchange for cash, property, or services. Stock purchased from a founder, inherited in a secondary transaction, or acquired on an exchange does not qualify, however small the company is. Founders and early employees generally clear this test; later investors buying from earlier ones generally do not.
The business is a qualified trade or business
Entire categories are excluded by statute: health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, and any business whose principal asset is the reputation or skill of its employees; banking, insurance, financing, leasing, and investing; farming; businesses claiming natural-resource depletion; and hotels, motels, and restaurants. A profitable services firm can be an excellent company and still be permanently outside §1202.
Gross assets were under the ceiling at issuance
The corporation's aggregate gross assets must have been below a statutory threshold at the time the stock was issued and immediately afterward. This is tested at issuance, not at sale, so a company that grew far past the ceiling can still have issued qualifying stock years earlier. The threshold was raised by the 2025 act for stock issued after July 4, 2025.
You held it long enough
For stock acquired on or before July 4, 2025, five years, with nothing for holding less. For stock acquired after that date, the 2025 act added tiers at three and four years with a partial exclusion, and the full exclusion at five. This is the test most often missed by a matter of months, and it is the only one where waiting is a real option.
What the 2025 Act Changed
The One Big Beautiful Bill Act, enacted in July 2025, improved §1202 in three ways — but only prospectively. The dividing line is the acquisition date of the stock, so the first question in any QSBS conversation now is which side of July 4, 2025 your shares fall on.
| Acquired on or before Jul 4, 2025 | Acquired after Jul 4, 2025 | |
|---|---|---|
| Holding period | Five years, all or nothing | Tiered — partial at three years, more at four, full at five |
| Per-issuer cap on excluded gain | The prior statutory cap | Raised, with inflation adjustment to follow |
| Corporate gross-asset ceiling | The prior statutory ceiling | Raised, with inflation adjustment to follow |
| Everything else | Unchanged — C corporation, original issuance, qualified trade or business all still apply exactly as before. | |
The caps and ceilings are dollar figures set by statute and now indexed, so they are deliberately not printed here. Read them in §1202 as it applies to your acquisition date, and confirm with your CPA.
Almost everything else written about reducing tax on a business sale describes something you can choose to do. QSBS is not that. Four of its five tests were settled by decisions made when the company was formed and funded, often for reasons that had nothing to do with an eventual sale. The useful question is therefore not "should I use QSBS" but "did I already qualify, and does anyone know?"
If You Are Short of the Holding Period
This is the one failure mode with a remedy. Section 1045 allows a holder who has held qualified small business stock for more than six months to roll proceeds into other qualified small business stock within 60 days, defer the gain, and carry the original holding period forward.
It does not exclude anything by itself — it preserves the possibility of excluding later. And the 60-day window is unforgiving, which means it has to be identified before a sale closes, not discovered when the return is prepared. If a sale is being negotiated and the five-year mark is close, that timing is worth putting on the table explicitly; a deal delayed by a quarter can be worth considerably more than the same deal on schedule.
The California Problem
For a seller in Orange County, Los Angeles, or San Diego, there is a second half to this that national guidance almost never mentions. California does not recognize §1202 at all.
California had its own qualified small business stock provisions until the Court of Appeal held them invalid in Cutler v. Franchise Tax Board in 2012, and the Legislature repealed rather than repaired them the following year. The result is that a founder whose gain is entirely excluded on the federal return reports that same gain in full on the California return and pays state tax on it.
That does not make qualifying less valuable — the federal number is the larger one, and excluding it is still the best available outcome. It does mean the after-tax figure in a model built on federal assumptions is wrong for a California seller, sometimes by a lot. The rest of that picture is in selling a business in California.
What Most People Miss
The first is that nobody volunteers this analysis. QSBS eligibility generates no product and no fee, so it tends to surface only if a CPA or attorney happens to ask early. Sellers routinely discover during diligence that they qualified, or that they missed by months, and by then the information is historical rather than useful.
The second is that the entity decision made at formation is the one that mattered most. LLCs and S corporations are usually the right answer for operating a business, and they are the wrong answer for §1202. That tension is real and there is no universally correct resolution — but a founder who understands it early can at least make the trade knowingly instead of finding out at exit.
The third is that qualifying changes what else you should do. If your gain is excluded federally, the case for layering on a fee-charging strategy to offset that same gain largely evaporates — there is nothing left to offset. Establishing QSBS status is therefore the first question in sale planning, not a footnote, because the answer determines which of the other approaches are even relevant. That full field is laid out in how to reduce capital gains tax when selling a business.
QSBS is the best outcome available on a business sale and the one least amenable to late planning. Establish two facts before anything else: whether you hold C-corporation stock acquired at original issuance in a business the statute does not exclude, and what date you acquired it. Those two answers determine whether §1202 is on the table at all, and if you are in California, remember that a full federal exclusion still leaves a state bill behind it.