Qualified Small Business Stock (QSBS): Section 1202 Tax Exclusion

Qualified small business stock QSBS is stock in a domestic C corporation that lets you exclude a large slice of your capital gain when you sell, under Internal Revenue Code section 1202. When the rules line up, you pay zero federal tax on the gain up to a per-issuer cap. That is the whole reason founders and early investors care so much about qualified small business stock. The company has to be a C corporation, not an S corp or an LLC taxed as a partnership, it has to be conducting an active trade or business, and its gross assets have to sit under a dollar ceiling at the time the stock is issued. You have to acquire the qualified small business stock at original issuance, meaning straight from the company in exchange for cash, property, or services, not bought off another shareholder on the secondary market. That original-issuance rule catches a lot of people who think buying early-stage shares from a departing employee gives them QSBS treatment. It does not.

Here is the part people get wrong. The exclusion percentage on qualified small business stock depends on when you acquired it. For stock acquired after July 4, 2025, a new tiered schedule applies. Hold it at least three years and you exclude 50 percent of the gain. Hold it four years and you exclude 75 percent. Hold it the full five years and you exclude 100 percent. Stock issued on or before July 4, 2025 keeps the old rule, which is a flat five-year hold for the 100 percent exclusion if acquired after September 27, 2010. The gross asset threshold also moved. Companies issuing qualified small business stock after July 4, 2025 can have up to 75 million dollars in gross assets, up from the prior 50 million dollar limit, with inflation indexing starting in 2027. So a company that was too big to issue QSBS under the old 50 million dollar ceiling might qualify now, which reopens the strategy for a lot of growth-stage businesses.

Worked example. You put 200,000 dollars into a startup in 2026 in exchange for founder shares that qualify as QSBS. Six years later you sell for 4.2 million dollars, a gain of 4 million dollars. Because you held past five years and the company met the test at issuance, you exclude the full 4 million dollars from federal tax. At a 23.8 percent long-term capital gains plus net investment income rate, that is roughly 952,000 dollars you do not pay. That single planning move can dwarf every other tax strategy a founder runs. New York, by contrast, does not conform to the federal exclusion in the same way, so a New York City resident may still owe state and city tax on that gain even when the federal bill is zero, which is exactly the kind of split a planner flags before you celebrate.

We see this every year. A client forms an LLC because it is cheap and flexible, raises money, grows, and only later learns that an LLC can never issue qualified small business stock. The window to convert to a C corporation and start the clock closed years earlier than they thought. If you are building something that might sell, talk to a planner about entity choice before you raise a dollar. Our entity formation and structuring service exists for exactly this decision. One edge case worth flagging. Gain on qualified small business stock that is not excluded, for the three and four year tiers, is taxed at a 28 percent rate, not the usual 20 percent, so the partial-hold math is less generous than it first looks. If you are weighing a sale, start with a new client inquiry so we can model the hold period against your real basis.

Not every small company can issue qualified small business stock. The corporation has to clear several tests, and missing any one of them blows the whole exclusion. First, it must be a domestic C corporation for substantially all of your holding period. An S corporation does not count, and neither does a partnership or an LLC that has not elected C corp treatment. Second, at the moment the stock is issued and right after, the company’s aggregate gross assets cannot exceed the threshold. For qualified small business stock acquired after July 4, 2025 that ceiling is 75 million dollars. For stock acquired earlier it is 50 million dollars. Gross assets means cash plus the adjusted basis of all other property, so a company sitting on a large funding round can blow past the line fast. A startup that closes a big Series B the week before issuing your shares might already be over the limit, and your stock would not qualify even though the business is young.

Third, the company has to pass the active business requirement. At least 80 percent of its assets, by value, must be used in the active conduct of a qualified trade or business. This is where qualified small business stock rules turn unfriendly to service firms. Section 1202 carves out health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage, and any business where the principal asset is the reputation or skill of its employees. Banking, insurance, financing, leasing, farming, mineral extraction, and operating a hotel or restaurant are also excluded. So a software company qualifies, a law firm does not, and a consulting shop is out. The statutory text of section 1202 spells out each disqualified field. A company also cannot hold more than 10 percent of its assets in portfolio stock or securities of other companies, or more than 10 percent in real estate not used in the active business, so a startup parking its cash raise in real estate can trip the test.

Worked example. A founder issues herself qualified small business stock when her SaaS company has 8 million dollars in gross assets. Three years later the company raises a round that pushes gross assets to 90 million dollars. Her shares still qualify, because the gross asset test is measured at issuance and immediately after, not at sale. New shares issued after the company crossed 75 million dollars would not qualify, but her original block is safe. That timing distinction saves serious money. The same founder who later buys more shares in a secondary, or receives options that vest after the cap is blown, has to track each tranche separately because some qualify and some do not.

We see this every year. Someone assumes that because their company is small and scrappy today, any stock they hold is automatically qualified small business stock. Then it turns out the company was an S corp for the first two years, or the principal asset is the founder’s personal reputation, and the exclusion evaporates. Document the C corp status, the gross asset figures at each issuance, and the active business activity contemporaneously. If you are unsure whether your company clears the active business test, our tax strategy consulting team reviews the facts before you rely on the exclusion. One edge case. Redemptions by the company in the years around your purchase can disqualify your stock under anti-abuse rules, so coordinate any buyback timing carefully. If your company is planning a tender offer, get the QSBS analysis done first.

The qualified small business stock exclusion is capped per issuer, and the cap recently got bigger. For stock acquired after July 4, 2025, you can exclude the greater of 15 million dollars or 10 times your adjusted basis in the stock of that one company. For qualified small business stock acquired on or before that date, the cap is the greater of 5 million dollars or 10 times basis. The 15 million dollar figure starts adjusting for inflation in 2027. The cap is measured separately for each company whose stock you hold, so a portfolio of qualified small business stock positions can each carry its own exclusion ceiling. That is a powerful feature for serial investors who hold QSBS in several startups, because each company gets its own fresh 15 million dollar allowance rather than one shared bucket across the whole portfolio.

The 10-times-basis branch matters more than people expect. If your basis in the qualified small business stock is high, say because you contributed appreciated property or paid real cash, the 10x figure can blow well past 15 million dollars. Suppose you invest 4 million dollars of cash for QSBS. Your cap is the greater of 15 million dollars or 40 million dollars, so 40 million dollars of gain can be excluded. Founders who receive stock for services, by contrast, often have near-zero basis, so they are stuck with the flat 15 million dollar branch. Knowing which branch governs your position changes how you size a sale. When you contribute appreciated property for QSBS, your basis for the 10x test is the fair market value at contribution, not your old carryover basis, which is a quirk that can dramatically raise the cap.

Worked example. You and your co-founder each hold qualified small business stock in the same company with 50,000 dollars of basis apiece. The company sells and each of you realizes 16 million dollars of gain. Your cap is the greater of 15 million dollars or 500,000 dollars, so 15 million dollars. You exclude 15 million dollars and pay tax on the remaining 1 million dollars at the 28 percent section 1202 rate, roughly 280,000 dollars. Your co-founder is in the identical spot. Planning around that 1 million dollar overage, possibly by gifting shares to family members who each get their own cap, is where real money lives. IRS Topic 409 on capital gains covers the rate mechanics. If you had instead held until a later year and spread the sale across two tax years, you could not double the cap, because the limit is per issuer over the life of your holding, not per year.

We see this every year. A founder sells, excludes what they think is the full gain, and forgets that the cap is per issuer and that gain above the cap is taxed at 28 percent rather than 20 percent. The surprise bill lands the following April. Run the numbers before you sign the purchase agreement, not after. Stacking, where you gift qualified small business stock to multiple non-grantor trusts or family members so each claims a separate 15 million dollar exclusion, is legitimate but technical, and the gifts have to be real and timely, completed before the sale is locked in. Our tax strategy consulting team builds these stacks. If a liquidity event is on the horizon, file a new client inquiry early, because the planning has to happen months before the deal closes.

You report a qualified small business stock sale on Form 8949 and Schedule D, and the exclusion shows up as a negative adjustment. When you sell QSBS that qualifies for the section 1202 exclusion, you list the full sale on Form 8949 with the proper code in column f, then enter the excluded portion as a negative number in column g so it nets out of your taxable gain. The remaining taxable gain flows to Schedule D and gets taxed at the applicable rate. The Schedule D instructions walk through the exact column entries and codes for section 1202 exclusions. Get the code wrong and the IRS computers will not know you claimed an exclusion at all, which can trigger a notice asking why your reported gain does not match the 1099-B from your broker.

The brokerage 1099-B almost never handles qualified small business stock correctly. Your broker reports the gross proceeds and basis but has no idea the stock qualified for section 1202 treatment, so the reported gain looks fully taxable. You have to make the adjustment yourself on Form 8949. This is one of the most common places qualified small business stock benefits get lost, because the taxpayer or an inexperienced preparer just transcribes the 1099-B and pays tax on gain that should have been excluded. Keep the original stock purchase documents, the company’s representations about its QSBS status, the date you acquired the shares, and the gross asset figures at issuance, because the IRS can ask you to prove every element years after the sale. A QSBS attestation letter from the company at the time of sale is worth chasing down while the company still exists.

Worked example. You sell qualified small business stock for 3 million dollars with a 100,000 dollar basis, a 2.9 million dollar gain, and you held it six years so 100 percent is excludable. On Form 8949 you report 3 million dollars proceeds and 100,000 dollars basis, then enter 2.9 million dollars as a negative adjustment with the section 1202 code. Schedule D shows zero taxable gain from the sale. If you had instead just carried the 1099-B straight through, you would have paid roughly 690,000 dollars in federal tax you never owed. The reporting mechanics are not optional polish, they are the difference between paying nothing and paying a fortune. The same care applies if only a portion of your shares qualify, because then you split the sale into qualifying and non-qualifying lots on separate Form 8949 lines.

We see this every year. A return gets filed without the column g adjustment, the exclusion is silently forgotten, and the client overpays by six figures. Sometimes we catch it and file an amended return on Form 1040-X within the three-year window to recover the cash. If your qualified small business stock sale was reported wrong in a prior year, our IRS audit, refund, and notice assistance team can pursue the refund. For getting the current-year return right the first time, our individual tax return preparation handles the section 1202 mechanics. One edge case. The excluded gain can still create alternative minimum tax preference for older 50 percent and 75 percent exclusions, though the 100 percent exclusion for post-2010 stock has no AMT addback. Confirm which rule governs your shares before you file, because that one fact changes whether you owe AMT.

Yes. Section 1045 lets you roll the proceeds from qualified small business stock you held more than six months into new QSBS and defer the gain, even if you have not hit the five-year mark for the section 1202 exclusion. This is the escape hatch for an investor whose company gets acquired early. You sell the qualified small business stock, reinvest the proceeds into other QSBS within 60 days, and your gain rides forward into the new stock instead of getting taxed now. Your holding period from the old stock tacks onto the new stock, which keeps the section 1202 clock running toward that 100 percent exclusion. It is one of the cleaner deferral tools in the code when the timing works, and it is the move that saves an early exit from becoming a fully taxable event.

The mechanics are strict. You have to have held the original qualified small business stock for more than six months. You have to reinvest within 60 days of the sale. Only the amount you reinvest gets deferred, so if you sell for 2 million dollars and reinvest 1.5 million dollars, the other 500,000 dollars of proceeds triggers gain to the extent of your realized gain. You make a section 1045 election on your timely filed return, including extensions. The replacement stock has to itself be qualified small business stock, meeting the active business and gross asset tests at the time you buy it. Miss any of those and the rollover fails. The IRS revenue procedure on section 1045 rollovers sets out the election details. You attach a statement to your return describing the sold stock, the replacement stock, and the gain you are deferring, so the paperwork has to be precise.

Worked example. You bought qualified small business stock for 300,000 dollars and the company is acquired 18 months later, paying you 1.3 million dollars, a 1 million dollar gain. You are not at five years, so a straight sale would be fully taxable. Instead you reinvest the entire 1.3 million dollars into a new startup’s QSBS within 60 days and elect section 1045. No tax now. Your basis in the new stock is 300,000 dollars and your holding period tacks, so if you hold the new stock another three and a half years you reach the five-year mark and can exclude the gain entirely under section 1202. You turned a taxable exit into a deferred, potentially tax-free one. If the new company later fails, your loss is measured against that 300,000 dollar carryover basis, which is a real risk to weigh before you roll.

We see this every year. An investor blows the 60-day window because the new deal took longer to close than expected, and the deferral is gone. Or they reinvest into an LLC thinking it counts, when only C corporation QSBS qualifies as replacement property. Line up the replacement investment before you sell, and confirm it qualifies. Coordinating a section 1045 rollover takes real planning across two transactions, which is what our tax strategy consulting team does. One edge case. Partnerships can make section 1045 elections at the entity or partner level, which gets technical fast for fund investors who hold QSBS through a venture fund. If you hold qualified small business stock through a fund and an exit is coming, send us a new client inquiry so we can map the rollover before the 60-day clock starts.