QSBS and the Section 1202 Exclusion: Tax-Free Startup Gains

Few provisions in the tax code reward risk the way QSBS and Section 1202 do. If you founded or funded a qualifying C corporation and later sell your shares at a gain, you may be able to exclude a large share of that gain, in some cases all of it, from federal income tax. For a founder who builds a company from a modest investment into a multimillion-dollar exit, the difference is measured in seven figures. This guide explains what qualified small business stock is, the tests a company must pass, how the exclusion is calculated, and what the 2026 rules changed for shares issued after July 4, 2025.

What qualified small business stock actually is

Qualified small business stock, or QSBS, is stock in a domestic C corporation that meets a specific set of requirements in Internal Revenue Code Section 1202. When those requirements are met and you hold the shares long enough, you can exclude part or all of the gain when you sell. The exclusion applies to federal capital gains tax, and it is one of the most valuable incentives available to founders, employees with equity, and early-stage investors.

The idea behind the provision is simple. Congress wanted to channel capital into new and growing businesses, so it offered a reward for backing them early and holding for the long term. The rules are precise, though, and a company that looks like a startup can still fail one of the tests. That is why the details matter so much. A single missed requirement can turn a tax-free exit into a fully taxable one.

The tests a company must pass

For your shares to count as QSBS, the company and the way you acquired the stock both have to satisfy several conditions. Each one is a gate. Miss any of them and the exclusion generally does not apply, so it helps to review them one by one before you assume you qualify.

• Domestic C corporation. The issuer must be a U.S. C corporation. Stock in an S corporation, a partnership, or an LLC taxed as a partnership does not qualify, though a later conversion to a C corporation can start the clock on newly issued shares.
• Original issuance. You generally must acquire the stock directly from the company in exchange for money, property, or services, not by buying it from another shareholder on the secondary market.
• The gross assets test. The corporation’s aggregate gross assets must stay at or below a dollar ceiling before and immediately after your stock is issued. That ceiling was $50 million for older shares and rose to $75 million under the 2026 rules.
• The active business requirement. At least 80% of the company’s assets, by value, must be used in the active conduct of a qualified trade or business. Passive holding companies do not qualify.
• The holding period. You must hold the shares for a minimum period, historically more than five years, to claim the full exclusion. The 2026 rules added shorter tiers, covered below.

Because these tests are tested at the moment of issuance and over the holding period, timing and documentation are everything. Many founders confirm QSBS status with a written analysis at the time shares are issued, so the record exists years before any sale.

How the Section 1202 exclusion is calculated

The exclusion is capped, and understanding the cap is the key to planning around it. For each company whose stock you hold, the amount of gain you can exclude is limited to the greater of two figures. The first is a fixed dollar amount, historically $10 million and now $15 million for newer shares. The second is ten times your adjusted basis in the stock you sold that year.

The ten-times-basis alternative is what makes the provision so powerful for investors who put real money in. Consider an investor who paid $3 million for qualifying shares. The ten-times figure is $30 million, which is far larger than the fixed dollar cap. In that case the investor could potentially exclude up to $30 million of gain, subject to the holding period and the other rules. For a founder whose basis is small, the fixed dollar cap usually governs instead.

The cap applies per company, per taxpayer. That structure creates real planning opportunities, since gifting shares to family members or funding separate qualifying companies can, in the right circumstances, multiply the number of available exclusions. Any such move has to be genuine and well documented, and it should be reviewed with a licensed tax professional before you act.

What the 2026 rules changed for QSBS section 1202

The One Big Beautiful Bill Act, enacted on July 4, 2025, reshaped the exclusion for stock acquired after that date. The changes are favorable, and they widen the pool of companies and shareholders that can benefit. Shares acquired on or before July 4, 2025 keep the prior rules, so the date of issuance now controls which regime applies to your holding.

A tiered exclusion by holding period

The biggest change is that the five-year holding period is no longer all or nothing for newer shares. Instead, a tiered schedule applies. Hold qualifying stock for at least three years and you may exclude 50% of the gain. Hold it for at least four years and the exclusion rises to 75%. Hold it for at least five years and the full 100% exclusion still applies. This gives founders and investors a partial benefit even when an exit comes sooner than expected.

Higher dollar and asset ceilings

Two limits also increased. The per-issuer cap on excludable gain rose from $10 million to $15 million, and it is indexed for inflation beginning in 2027. The corporation’s aggregate gross assets ceiling rose from $50 million to $75 million, which means larger companies can now issue QSBS than before. Together, these changes let more capital qualify and let each shareholder shelter more gain.

The practical takeaway is that the exact issuance date of your shares decides which column applies. For that reason, founders raising new rounds and investors funding new companies should confirm which rules govern each specific tranche of stock.

A worked example

Numbers make the benefit concrete. Suppose a founder incorporates a software company as a C corporation and receives founder shares for a nominal amount. Over six years the business grows, and she sells her stake for a $6 million gain. Assume the company met the gross assets test at issuance and the active business requirement throughout, and that she held the shares for more than five years.

Because her gain of $6 million sits below the per-issuer cap, and because she cleared the five-year mark, she may be able to exclude the entire $6 million from federal capital gains tax. At a combined federal capital gains and net investment income rate that can approach 23.8%, the potential federal tax avoided is in the range of $1.4 million. That figure is illustrative, and the actual result depends on her basis, her state, the exact issuance date, and whether every requirement was satisfied. State treatment varies, since not every state conforms to Section 1202.

Now change one fact. If she had sold after only three years under the newer rules, she might have excluded 50% of the gain rather than all of it. The remaining half would be taxable. That contrast shows why the holding period, even in its more flexible 2026 form, still drives the size of the benefit.

Businesses that do not qualify

Section 1202 deliberately excludes certain fields, even when the company is a small C corporation. The exclusion is aimed at operating and product businesses, not at service firms whose main asset is the skill of their people. In general, the following do not qualify as a qualified trade or business:

• Professional service firms in health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, and financial or brokerage services.
• Banking, insurance, financing, leasing, and investing businesses.
• Farming businesses, including the raising or harvesting of trees.
• Businesses involving the extraction of oil, gas, or other minerals that qualify for depletion.
• Operating a hotel, motel, restaurant, or similar business.

The recurring theme is that a business whose principal asset is the reputation or skill of one or more employees generally falls outside the rules. A technology company, a manufacturer, or a consumer product company usually fits, while a medical practice or a wealth management firm usually does not. Where a business has mixed activities, the analysis turns on facts, and it is worth a professional review.

How to protect the exclusion

Qualifying is only half the task. Keeping the benefit through to sale requires attention to a few points that trip people up. Each is manageable when you plan for it early rather than discover it at closing.

• Document QSBS status at issuance. Capture the company’s gross assets and business activity in writing when shares are issued, so the record is contemporaneous.
• Mind redemptions. Certain stock buybacks by the company near the time of issuance can disqualify the stock. Review any redemption against the rules before it happens.
• Watch entity conversions. If a business starts as an LLC or S corporation and later converts to a C corporation, the holding period generally begins at conversion for the newly issued shares, not at the original founding.
• Track each tranche separately. Shares acquired at different times may fall under different rules and different holding-period clocks.
• Confirm state conformity. Some states follow the federal exclusion, and some do not. Your state result may differ from your federal result.

None of these is difficult on its own. The failures usually come from treating QSBS as an afterthought at exit rather than a status you establish and protect from day one.

Where QSBS fits in a high earner’s plan

QSBS is one of the most powerful tools available to founders and equity holders, but it works best as part of a coordinated plan rather than a standalone move. It pairs naturally with the other strategies high earners use to build wealth on a tax-favored basis. If you hold appreciated positions and give to charity, our guide to charitable bunching with a donor-advised fund shows how to donate winners and erase the embedded gain. If you want to move more into tax-free retirement growth, review our piece on the mega backdoor Roth. Used together, these strategies form a system rather than a set of isolated tactics.

For the official rules, the statute itself is the primary source, and you can read the full text of Internal Revenue Code Section 1202. The IRS also explains how capital gains are taxed and reported in its overview of capital gains and losses. Both are worth reviewing before you rely on the exclusion for a specific sale.

Frequently asked questions

Can employees with stock options claim the QSBS exclusion?

Potentially, yes. Employees who acquire stock by exercising options may hold QSBS if the company met the requirements at the time the shares were issued and the other tests are satisfied. The holding period generally starts when the shares are actually acquired, not when the options were granted.

Does QSBS help with state taxes too?

It depends on your state. Some states conform to Section 1202 and allow a parallel exclusion, while others do not conform and tax the full gain. Because the answer varies, confirm your state’s treatment before assuming the federal benefit carries over.

What happens if I sell before the holding period is met?

Under the newer rules, selling before three years generally means no exclusion, while three and four years produce partial exclusions of 50% and 75%. In some cases, Section 1045 allows you to roll the proceeds into new qualifying stock and preserve the benefit. That option should be reviewed carefully with a professional.

Your next step

If you own or are about to acquire stock in a C corporation, the QSBS rules may be one of the largest tax benefits available to you, and the time to confirm your status is now rather than at sale. Start by checking whether the company meets the gross assets and active business tests, and note the exact issuance date so you know which rules apply.

For more strategies you can put to work this year, download our free guide, Top 5 Tax Strategies for High-Income Earners. When you are ready for the full framework of more than 100 strategies, explore the ETS Playbook.

The strategies described here are general educational information about the U.S. tax code. Individual results vary based on income, entity structure, holding period, state law, and other factors. This is not personalized tax, legal, or financial advice. Consult a licensed tax professional before implementing any strategy.