QSBS and Section 1202: The $10M Federal Exclusion Every Founder Should Know

IRC §1202 excludes from federal income tax the gain on qualified small business stock held more than five years, up to the greater of $10 million or 10 times the taxpayer’s basis in the stock. For founders and early employees who acquired shares directly from a qualifying C-corporation, the exclusion can eliminate federal tax on seven and eight-figure gains. There is no other provision in the code this generous.

The rules are narrow. The company has to be a C-corporation at the time the stock is issued and for substantially all of the holding period. Gross assets have to be under $50 million at issuance. The business cannot be in an excluded industry (health, law, engineering, financial services, hospitality, farming, and a handful of others). The stock has to be held by the original holder for more than five years. And the taxpayer’s exclusion is per-taxpayer, per-issuer, which means planning can multiply the effective exclusion across trusts and family members.

This guide walks through the requirements, the common disqualifiers, the rollover provision that preserves eligibility, and the gifting strategies that stack exclusions.

The core five-year rule

To qualify for §1202 exclusion, the taxpayer must have acquired the stock at original issuance from a qualifying C-corporation and held it for more than five years. Original issuance means the stock was issued directly by the corporation to the taxpayer, not purchased from another shareholder on the secondary market.

The five-year clock starts at acquisition. For founders who received stock on day one, the clock starts at incorporation. For employees who exercised stock options, the clock starts at the exercise date, not the option grant date. For early-exercise shares with 83(b), the clock starts at the early-exercise purchase date.

This is where many would-be QSBS holders lose the exclusion. A senior employee at a growth-stage company who exercises ISOs in year six of employment cannot claim QSBS on the shares acquired at exercise unless they hold another five years. Pre-IPO companies that get acquired within ten years of founding often have this problem: founders qualify, but employees who exercised later do not.

The $10M or 10x basis cap

The exclusion is the greater of $10 million or 10 times the taxpayer’s basis in the QSBS. For a founder who acquired stock for $100 in incorporation paperwork, the cap is $10 million (because 10x $100 = $1,000 is much less than $10M). For an employee who exercised options at $5 million of basis, the cap is $50 million (10x $5M).

The cap is per-taxpayer, per-issuer. A married couple filing jointly has one $10M cap jointly. But if each spouse held the stock in separate accounts acquired separately, they might have two caps, subject to the rules on marital property.

Exclusion percentages vary by acquisition date. Stock acquired August 11, 1993 through February 17, 2009: 50% exclusion. Stock acquired February 18, 2009 through September 27, 2010: 75% exclusion. Stock acquired on or after September 28, 2010: 100% exclusion. The 100% tier is what most current founders care about.

The 7% AMT preference on the excluded portion was eliminated for 100% QSBS under §1202(a)(4), meaning 100% QSBS is fully excluded for both regular tax and AMT.

The C-corporation and $50M gross assets tests

The issuing corporation must be a C-corporation (not an LLC, partnership, or S-corp) at the time of issuance and for substantially all of the holding period. This matters for companies that convert entity type: a former LLC that converted to a C-corp can begin issuing QSBS from the conversion date, but stock originally issued as LLC interests does not qualify.

Gross assets must be under $50 million at any point up to and including the issuance. If the company’s gross assets exceeded $50M before the taxpayer’s stock was issued, the stock does not qualify regardless of when it was later held. Most venture-backed companies cross the $50M threshold somewhere between Series B and Series C.

Once the threshold is crossed, new stock issuances are not QSBS. Stock already issued remains QSBS (the test is at issuance, not continuously). That is why “get your QSBS clock started early” is a planning mantra for founders and first-hire employees: the window closes once the company scales.

The active business requirement under §1202(e) says at least 80% of the corporation’s assets must be used in qualified trades or businesses for substantially all of the holding period. Holding real estate, holding passive investments, or pivoting into an excluded industry can break the active-business test retroactively.

The excluded industries list

§1202(e)(3) lists industries that do not qualify. The main ones:

• Any trade or business where the principal asset is the reputation or skill of one or more employees. This is the broad “professional services” carve-out. Historically interpreted to exclude consulting firms, law firms, accounting firms, medical practices, and similar.
• Banking, insurance, financing, leasing, investing, or similar businesses.
• Farming.
• Mining and oil/gas extraction.
• Hotels, motels, restaurants (the hospitality carve-out).

Tech companies generally qualify because software and internet businesses are not on the excluded list. Biotech and medical device companies typically qualify despite the health services exclusion; the carve-out applies to healthcare provider services, not to R&D or product companies.

Gray areas exist. A consulting-heavy SaaS company, a tech-enabled services business, or a fintech might face scrutiny. The test looks at the nature of the business, not the superficial label.

Section 1045 rollover

If you sell QSBS before the five-year hold completes, §1045 allows you to roll the proceeds into replacement QSBS within 60 days and preserve the original holding period.

Mechanics. Sell the original QSBS. Within 60 days, reinvest the proceeds in stock of another qualifying small business. The replacement stock tacks onto the original holding period, so if you sold in year three and reinvested immediately, you need another two years of holding the replacement to hit the five-year threshold.

This provision is useful for two scenarios. First, a founder whose company is acquired pre-five-year can roll proceeds into a new venture and preserve the exclusion. Second, an employee who needs liquidity before year five can roll into a QSBS-eligible fund that in turn invests in qualifying portfolio companies.

The replacement stock must itself meet all §1202 requirements. Not all “small business” investments qualify. Many QSBS-focused funds operate specifically to provide §1045 rollover vehicles for founders in this position.

Stacking QSBS exclusions

Because the $10M cap is per-taxpayer, per-issuer, gifting shares to trusts and family members before a liquidity event can multiply the total federal-exclusion amount.

A founder with $100M of QSBS (acquired at $10k basis, so $10M cap applies) faces $90M of taxable gain on the excess. By gifting $10M of QSBS to each of several irrevocable non-grantor trusts for the benefit of family members, each trust becomes a separate taxpayer with its own $10M exclusion. Eight well-structured trusts could stack eight exclusions, eliminating federal tax on up to $80M of the excess.

Requirements for stacking:

• The trust must be a separate taxpayer (non-grantor trust) for federal income tax purposes, so the gain flows to the trust, not back to the grantor.
• The gift of QSBS to the trust must occur before the liquidity event. Gifts of QSBS are a permitted tacking-preserving transaction under §1202(h)(2).
• The grantor must use lifetime exclusion (or annual exclusion, or pay gift tax) for the value transferred. In 2025, the lifetime estate and gift tax exclusion is $13.99M per person.
• The trust must be set up and funded well in advance of any sale to withstand scrutiny that the transfer was part of a pre-arranged sale.

Stacking is complicated and typically requires a trust and estates attorney, a QSBS-experienced tax attorney, and an accountant. The savings can be enormous (federal tax at 23.8% on $70M is $16.66M), but the execution risk is real.

State conformity

Not all states conform to §1202. California, New Jersey, Pennsylvania, and Mississippi explicitly do not, meaning state tax is owed on the federal-excluded gain at the state’s capital-gain rate. California’s rate is up to 13.3%, so a $10M federal-excluded QSBS gain still generates roughly $1.33M of California tax.

Most other states either conform to §1202 fully (exclude the same amount federal excludes) or partially (e.g., Massachusetts conforms with adjustments). Confirm state treatment with counsel before a sale.

Moving states before the sale can help on QSBS if done carefully. The key is establishing new state residency well before the sale closes, with documented change of domicile. State residency audits are aggressive in California and New York, and a last-minute move is unlikely to hold up.

Frequently asked

Do I need to do anything special to claim the exclusion? Report the gain on Form 8949 and Schedule D with the appropriate QSBS code. Maintain records showing original issuance date, acquisition cost, holding period, and the issuer’s QSBS certification. Audit risk is higher on QSBS claims; good documentation matters.

What if the company converts from a C-corp to another form? The conversion typically breaks QSBS treatment prospectively. Holders who already met the five-year rule at conversion are generally safe; holders still in the clock lose eligibility.

Can I claim QSBS on stock received in an acquisition? Stock received in certain tax-free reorganizations (merger, acquisition with rollover) can preserve QSBS status if the acquirer also qualifies. Acquirer-stock QSBS treatment is narrow and typically requires both companies to meet the tests.

What about ISOs: do they qualify? Yes, stock acquired through ISO exercise can be QSBS if all other §1202 requirements are met. The exercise date starts the five-year clock. Employees with early exercise plus 83(b) start the clock at the early-exercise date, which is often much earlier.

Does the gain have to be on a sale, or does any disposition work? §1202 applies to sale or exchange of QSBS. Gifts of QSBS transfer eligibility to the recipient but do not trigger exclusion (no gain recognized on gift). Distributions from a non-grantor trust to beneficiaries similarly do not trigger exclusion; the trust’s sale of QSBS does.

Next step

QSBS eligibility is a documentation project as much as a tax strategy. Before a liquidity event, assemble the issuer certification, the cap table history showing gross assets over time, your acquisition documents, and the holding-period calculation. The QSBS qualification checklist walks through the tests. If your position is large enough that stacking could meaningfully change the outcome, engage a QSBS-focused tax attorney 18-24 months before the expected liquidity event.