Qualified Small Business Stock (QSBS) is a special federal tax benefit under Internal Revenue Code Section 1202 that can let eligible investors in small businesses exclude a significant portion – in many cases up to 100% – of the gain on the sale of qualifying stock. In practical terms, QSBS can help founders and early investors save up to $10 million per taxpayer, or 10 times their investment, in federal taxes, making it a powerful tax planning tool for venture capitalists and technology startup founders.
Because the potential savings are so large, QSBS often becomes a key consideration in how startups choose their entity type, structure funding rounds, and plan for exits.
Understanding QSBS through a hypothetical example
To make this concrete, consider a simplified example that illustrates the potential tax savings for a startup founder.
A simplified QSBS benefit example
Assume a founder holds shares in a technology startup that is structured as a U.S. C‑corporation. The founder acquired these shares at a very low cost, close to zero for tax purposes, and has held them for more than five years, satisfying one of the key QSBS requirements.
The startup is acquired, and the founder’s stake is worth $20 million at the time of sale. Under QSBS rules, assuming all criteria are met, the founder may be able to exclude up to $10 million of the gain from federal income taxes.
Without QSBS, the founder might pay long‑term capital gains tax (for example, at a 20% rate) on the full $20 million, resulting in $4 million of federal tax and $16 million in post‑federal‑tax proceeds. With QSBS, if $10 million of gain is excluded, only the remaining $10 million is taxed at 20%, resulting in $2 million of federal tax, $18 million in post‑federal‑tax proceeds, and roughly $2 million of tax savings.
This illustrates why QSBS is so valuable – and why VCs, founders, and early employees pay close attention to whether their stock qualifies.
High‑level QSBS eligibility requirements
Here are the main, high‑level eligibility requirements under Section 1202. Every company is unique, so you should work with your law firm and specialized QSBS advisors before claiming or attesting to this exclusion.
Company requirements
- C‑corporation status. Your business must be a U.S. C‑corporation for federal income tax purposes when the stock is issued. QSBS does not technically require Delaware incorporation, although most VC‑backed startups still choose Delaware for legal and practical reasons.
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Aggregate gross assets limit (OBBBA update). The corporation’s aggregate gross assets (cash plus the tax‑basis adjusted value of its property) must stay below certain thresholds at the time of and immediately after the stock issuance. The limit depends on when the stock is issued:
- For stock issued on or before July 4, 2025: aggregate gross assets must not exceed $50 million.
- For stock issued on or after July 5, 2025: under the One Big Beautiful Bill Act (OBBBA), the aggregate gross asset limitation increases to $75 million, and this higher cap will be adjusted annually for inflation beginning in 2027.
- Importantly, this test is based on tax basis, not the GAAP balance sheet your bookkeeper or controller may prepare. Because tax basis and book values can differ significantly (for example, due to depreciation or expensing), you should work closely with a startup‑focused tax CPA to determine whether you are under the applicable threshold for each issuance.
- Active business requirement. At least 80% of the corporation’s assets (by value) must be used in the active conduct of a qualified trade or business. If you invest excess cash aggressively, you risk failing the active business test. Startups should design treasury and cash‑management policies to preserve liquidity for operations rather than to generate significant investment income, and should involve tax and legal advisors in those decisions.
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Not in certain excluded industries. Section 1202 excludes certain businesses from QSBS treatment. In general, a corporation cannot qualify as a “qualified trade or business” if it is primarily engaged in:
- Service businesses in fields like health, law, engineering, architecture, accounting, consulting, financial services, or brokerage services, where the principal asset is the reputation or skill of one or more employees.
- Banking, insurance, financing, leasing, investing, or similar businesses.
- Farming.
- Mining, oil and gas extraction, or similar natural‑resource activities.
- Hotels, motels, restaurants, and similar hospitality businesses.
By contrast, many venture‑backed tech, SaaS, and life‑sciences companies often operate in qualifying trades or businesses, assuming they meet the other QSBS rules.
- Domestic corporation. The corporation must be a domestic corporation – it must be organized in the United States.
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No significant redemptions. Section 1202 contains “no significant redemptions” rules that can cause stock to lose QSBS status if the company buys back too much of its own stock around the time it issues new shares. In broad terms, these rules look at a window spanning two years before and two years after the date the stock is issued.
For example, if a company redeems a large block of founder or early‑employee stock shortly before issuing new stock in a financing, that redemption can cause the new shares to fail QSBS requirements. Because the impact can extend to multiple stockholders, founders should involve experienced legal counsel before doing significant buybacks and should carefully manage their cap table (cap table software helps here).
Stock and shareholder requirements
- Acquisition method (original issuance). The stock must be acquired at original issuance, either directly from the company or through an underwriter, in exchange for money, property (not including other stock), or services. Stock acquired by purchasing it from another shareholder on the secondary market will generally not qualify.
- Holding period. To use the QSBS gain exclusion, you must hold the stock for more than five years. The holding period usually starts on the date the stock is actually issued (for example, the date founder stock or restricted stock is issued, or the date an option is exercised and stock is delivered), not when an option is granted.
- Eligible stockholders. The QSBS exclusion is generally available to individuals, certain trusts, and estates. Corporations cannot take the exclusion on their own returns. Partnerships and LLCs taxed as partnerships can hold QSBS, and their partners may be able to claim QSBS benefits on their distributive share if both the partnership and the partners meet the Section 1202 rules – a common structure for venture capital and growth‑equity funds.
- Issuance date. Only stock issued after August 10, 1993 is potentially eligible for QSBS treatment.
Do VCs care about QSBS?
Yes, venture capitalists care a lot about QSBS. While many limited partners in VC funds are non‑tax‑paying entities (like foundations and endowments), the general partners are often individuals who can benefit from QSBS.
Because partnership‑structured funds can potentially pass QSBS benefits through to individual partners, GPs are very focused on whether a portfolio company’s stock qualifies and stays qualified. This is one reason you’ll see funding documents that ask the startup to represent or warrant that its stock qualifies (or is intended to qualify) as QSBS at the time of investment.
Founders need to be careful with these representations. Representing current facts that your legal counsel and tax advisors are comfortable with can be reasonable, but you should avoid guaranteeing future QSBS treatment, because many eligibility requirements depend on each individual shareholder’s circumstances and on future events outside the founders’ control.
Entity choice: C‑corporations vs LLCs
Can a company convert from an LLC to a C‑corp to become QSBS‑eligible? We sometimes see companies start as LLCs and later convert into C‑corporations, often ahead of a significant funding round. In some cases, an experienced legal team may structure the conversion so that QSBS treatment is available on future stock issuances.
However, converting does not make pre‑conversion LLC interests magically become QSBS. Only the new C‑corp stock issued after the conversion can potentially qualify, and only if all other Section 1202 conditions are satisfied. This is complex legal work, so founders should involve specialized legal counsel and tax advisors; Kruze does not provide legal advice and does not opine on the specific mechanics of LLC‑to‑C‑corp conversions.
LLCs are not QSBS‑eligible
At Kruze, as tax advisors to many startups, we see a lot of companies that mistakenly form as LLCs because they received generic small‑business tax advice that doesn’t fit the venture‑backed startup world. To be QSBS‑eligible, a small business must be a C‑corporation for federal tax purposes – LLC and partnership interests are not QSBS.
If a startup plans to raise venture capital, it will almost always need to convert to a Delaware C‑corporation. VCs prefer Delaware C‑corps because they are not pass‑through entities (so annual gains and losses do not flow directly to the fund’s tax return) and because Delaware corporate law is well established and predictable.
How much gain can QSBS exclude?
Section 1202 allows eligible taxpayers to exclude up to 100% of the gain on the sale of QSBS from federal income tax, subject to certain limits. The exclusion percentage depends on when the stock was acquired, with earlier periods qualifying for 50% or 75% exclusions and more recent acquisitions often qualifying for a 100% exclusion.
In addition, the amount of gain that can be excluded is capped at the greater of:
- $10 million per taxpayer (per issuing corporation), or
- 10 times the taxpayer’s basis in the QSBS being sold.
These rules are technical, and there are special rules for married taxpayers and for multiple sales over time, so you should model scenarios with a qualified tax advisor.
State tax treatment varies: some states conform to Section 1202 and allow similar exclusions, while others do not, so state and local taxes may still apply even when federal QSBS exclusion is available.
Is QSBS a tax credit?
QSBS is not a tax credit. The technical term for the QSBS benefit is an exclusion: it allows eligible taxpayers to exclude a portion (up to 100%) of the gain from the sale or exchange of QSBS from their taxable income.
A tax credit reduces the amount of tax you owe dollar‑for‑dollar. A gain exclusion instead reduces your taxable income by keeping certain gains out of income in the first place. Under Section 1202, the exclusion applies to QSBS held for more than five years, and the total excluded gain is subject to the $10 million or 10‑times‑basis caps described above.
Why founders should be cautious with QSBS representations
Because QSBS can be so valuable, VCs will sometimes propose attestation letters or contract language where the company and founders represent that the stock being issued “is QSBS.” We do not recommend that founders sign broad QSBS guarantees.
Many QSBS eligibility requirements depend on shareholder‑level facts (such as whether an investor is an eligible taxpayer and how long they personally hold the stock) and on future events the founders cannot control. Over‑promising can create significant personal and corporate risk if the stock later turns out not to qualify and investors lose expected tax benefits. Instead, work with your law firm and tax advisors to craft accurate, limited representations about the company’s current status and practices.
QSBS FAQ
Does my company have to be a Delaware C‑corp to use QSBS?
No. QSBS requires that your company be a U.S. C‑corporation for federal income tax purposes, but it does not require incorporation in Delaware or any other specific state. Many venture‑backed startups choose Delaware for separate corporate‑law reasons.
What is the aggregate gross asset limit now?
For QSBS issued on or before July 4, 2025, the aggregate gross asset limit is $50 million. For QSBS issued on or after July 5, 2025, the One Big Beautiful Bill Act increased the limit to $75 million, with inflation adjustments beginning in 2027.
Can LLC equity ever qualify as QSBS?
No. Interests in LLCs or partnerships are not QSBS. If an LLC converts to a C‑corp, only the new C‑corp stock issued after conversion can potentially qualify, and only if all the other requirements are met.
Do stock options qualify as QSBS?
Stock options themselves do not qualify as QSBS. QSBS analysis begins when the option is exercised and stock is actually issued, and the five‑year holding period generally starts on the exercise/issuance date.
Does QSBS eliminate all taxes on exit?
QSBS can eliminate federal income tax on qualifying gain up to the applicable limits, but it does not automatically eliminate state or local taxes, and other federal taxes (such as the net investment income tax) may still apply. State conformity to Section 1202 varies, so founders should model both federal and state outcomes.
Can my investors force me to guarantee QSBS treatment?
Investors may request that you represent that the company currently meets certain QSBS requirements. You should not guarantee that stock will always qualify for QSBS in the future and should consult your legal and tax advisors before signing any QSBS‑related provisions.
