How Does the QSBS Exclusion Work in 2025? (w/Examples) + FAQs

This article reflects federal rules and California rules as of June 2026 and covers tax year 2025. Tax law changes — confirm current figures before you file.

Quick Answer

The QSBS exclusion lets you skip federal tax on capital gains from qualified small business stock. For 2025, stock held five-plus years can exclude up to the greater of $15 million or 10× your basis. Stock issued after July 4, 2025 also unlocks 50% at three years and 75% at four years.

Qualified Small Business Stock, or QSBS, is shares in a small U.S. C corporation that can let you walk away from a sale owing zero federal capital gains tax — a benefit that can be worth millions on a single exit, and one that the One Big Beautiful Bill Act (OBBBA) just made far stronger. The catch in 2025 is that the rules split in two on July 4, 2025: stock issued on or before that date follows the old playbook, while stock issued after it gets bigger caps, a higher company-size limit, and a brand-new short holding-period option.

That split is the single most important thing to get right this year, because picking the wrong rule set can cost you a 100% exclusion or trap your gain at a 28% tax rate. Founders racing toward an exit, angel and venture investors timing a sale, and early employees sitting on cheap shares all need to know which version applies to their shares — and the answer depends entirely on the day the stock was issued, not the day you sell.

Here is what you will learn:

🧾 The exact 2025 dollar caps, holding periods, and company-size limits — and which apply to your shares.
⏳ How the new three-year and four-year partial exclusions work, and the 28% rate trap hiding inside them.
💵 Fully worked dollar examples showing real tax saved (and real tax owed).
🗺️ Which states tax your “tax-free” gain anyway — including California, which does not conform.
🛡️ Advanced moves like trust “stacking” and Section 1045 rollovers, plus the seven mistakes that void the break.

What QSBS Actually Is

QSBS is stock in a qualified small business — and “small business” here has a precise legal meaning under Section 1202 of the Internal Revenue Code. It is not a label you apply for. It is a status your shares either earn at issuance or never get, based on the company, the stock, and you.

Congress created Section 1202 in 1993 to push private money into small startups, as The Tax Adviser explains. The deal is simple in spirit: take the risk of funding a tiny company, hold the shares long enough, and the government lets you keep the gain federal-tax-free. For 2025, that promise is bigger than it has ever been.

The benefit is per taxpayer, per company. That means each shareholder gets their own cap, and a single person can hold qualifying stock in several different companies, each with its own separate exclusion limit. This per-issuer design is also what makes the advanced trust strategies later in this article possible.

The Three Tests Every Share Must Pass

To be QSBS, stock must clear three gates, and missing any one voids the break entirely. First is the company test: the issuer must be a domestic C corporation. Second is the acquisition test: you must receive the stock at original issuance — directly from the company for money, property, or services — not bought from another shareholder. Third is the holding test: you must hold the stock long enough, which since OBBBA can mean three, four, or five years depending on when the stock was issued.

The consequence of failing a test is total, not partial. If you buy shares on the secondary market from a departing founder, those shares are not QSBS to you, even if they were QSBS to the founder. The fix is to know the rules before you acquire stock — request a QSBS attestation from the company at the time of investment and keep it with your records.

The Big 2025 Split: Old Rules vs. New Rules

The most important date in QSBS today is July 4, 2025, the day President Trump signed OBBBA into law. As the Davis Wright Tremaine startup law blog makes clear, the new rules apply only to QSBS issued after July 4, 2025. Stock issued on or before that date stays under the old rules for its entire life.

This is not a transition you can opt into. The date the stock was issued — not when you sell, and not the current tax year — locks in which rule set governs your shares forever. A founder who issued herself stock in 2022 lives under the old rules even if she sells in 2030. A new investor who funds a round in August 2025 gets the new rules.

Here is the side-by-side that decides everything else:

Feature	Old Rules (stock issued on or before July 4, 2025)	New Rules (stock issued after July 4, 2025)
Holding period for full exclusion	5+ years for 100%	5+ years for 100%
Partial exclusion	None — all or nothing at 5 years	50% at 3 years, 75% at 4 years per Hanson Bridgett
Per-issuer gain cap	Greater of $10M or 10× basis per The Tax Adviser	Greater of $15M or 10× basis, indexed from 2027
Company gross-asset limit at issuance	$50 million	$75 million, indexed from 2027 per Grant Thornton
Rate on any non-excluded gain	28% QSBS rate	28% QSBS rate

Most of the old framework survives. The active-business requirement, the C corporation requirement, the original-issuance rule, and the list of excluded service businesses all carry over unchanged, as The Tax Adviser notes. OBBBA changed the dials, not the engine.

The Tiered Holding Period (New Rules)

Before OBBBA, QSBS was all-or-nothing: hold five years and one day for 100%, or get nothing for selling earlier. OBBBA replaced that cliff with a staircase for stock issued after July 4, 2025, as described by Mintz.

The new graduated schedule works like this:

Hold at least 3 years: exclude 50% of eligible gain.
Hold at least 4 years: exclude 75% of eligible gain.
Hold 5 years or more: exclude 100% of eligible gain (unchanged).

This is a genuine win for founders and investors who face an early acquisition offer. Under the old rules, a sale at year three meant the full gain was taxable. Under the new rules, half of that same gain can vanish from your federal return.

The 28% Rate Trap Hiding Inside the Tiers

Here is the part that quietly bites people. Any gain that is not excluded at the three-year or four-year tier is taxed at a 28% capital gains rate — not the usual 20% long-term rate — per both Davis Wright Tremaine and The Tax Adviser.

The reason matters: the 50% and 75% tiers do not simply give you a partial discount at normal rates. They give you a partial exclusion, and the leftover gain rides a higher rate. So selling at year three is not “half the tax of a normal sale” — the math is less generous than it first looks.

The misconception is that an early sale under the new tiers is nearly as good as waiting. It is not. A common error is selling at three years and four months when waiting eight more months to hit five years would have made the entire gain disappear at a 0% federal rate. Your move: before accepting an early offer, run both numbers and ask whether you can delay closing past your five-year mark.

The Gain Exclusion Cap and Company-Size Limit

The exclusion is generous but capped. For 2025, the per-issuer cap is the greater of a flat dollar amount or 10 times your adjusted basis in the stock, per The Tax Adviser. OBBBA lifted the flat amount from $10 million (old rules) to $15 million (new rules), with inflation indexing beginning in 2027.

The 10× basis branch is the sleeper. If you invested $3 million for QSBS, your cap is the greater of $15 million or $30 million — so $30 million. Large investors with sizable bases often get far more than the headline number, which is why the cap is written as “greater of,” not a flat ceiling.

The company-size gate also moved. To issue QSBS, a C corporation’s aggregate gross assets — cash plus the adjusted basis of its property — must stay at or below the limit immediately before and after the stock is issued. OBBBA raised that limit from $50 million to $75 million for stock issued after July 4, 2025, per Grant Thornton. This brings more growth-stage startups into range — but the test is measured at issuance, so a company can blow past $75 million in value later and its earlier shares still qualify.

What “Per Issuer, Per Taxpayer” Really Means

The cap resets for each separate company you invest in. If you hold qualifying stock in three different startups, you potentially get three separate $15 million caps, not one shared limit. This is the foundation of multi-company portfolio planning for active angel investors.

The consequence of misreading this is leaving exclusions on the table — or double-counting them. The next step for a serial investor is to track basis and issuance dates per company in a simple spreadsheet, because each issuer is its own self-contained exclusion bucket with its own clock and its own cap.

Which Situation Applies to You?

QSBS answers branch hard by who you are and when your stock was issued. Find your row before reading further:

Founder with pre-July 4, 2025 stock: You are under the old rules — $10 million / 10× cap, five-year all-or-nothing. Focus on hitting five years and on state conformity.
Founder or investor with post-July 4, 2025 stock: You get the new rules — $15 million / 10× cap, $75 million company limit, and the 3/4/5-year tiers. Watch the 28% trap on early sales.
Angel or VC investor across several companies: Your edge is the per-issuer cap stacking across portfolio companies; track each separately.
Early employee with options: Your QSBS clock and acquisition date usually start at exercise, not grant — exercising early can start the holding period sooner.
High-net-worth holder facing a big exit: Look at non-grantor trust “stacking” and gifting to multiply the cap, covered below.

Worked Examples With Real Dollars

Money examples are where QSBS stops being abstract. Each scenario below uses round numbers so you can copy the math.

Example 1 — The clean 100% exclusion (new rules). Maria invests $500,000 at original issuance for QSBS in a C corporation in September 2025. She holds five years and sells in 2030 for $8 million, a gain of $7.5 million. Her cap is the greater of $15 million or 10× her $500,000 basis ($5 million), so $15 million. Her $7.5 million gain is fully under the cap and held five-plus years, so she excludes 100% and owes $0 federal capital gains tax on the sale.

Example 2 — Early sale at three years (new rules, the 28% trap). Devin holds post-OBBBA QSBS with a tiny basis and sells at three years and two months for a $4 million gain. He excludes 50% ($2 million). The other $2 million is taxed at the 28% QSBS rate, not 20% — that is $560,000 of federal tax. Had he waited until year five, he would have excluded the full $4 million and paid $0. Waiting roughly 22 more months would have saved $560,000.

Example 3 — The 10× basis cap in action. Priya invests $4 million for post-OBBBA QSBS and sells after five years for $50 million, a gain of $46 million. Her cap is the greater of $15 million or 10× her $4 million basis ($40 million), so $40 million. She excludes $40 million federally. The remaining $6 million of gain is taxable — at the 28% QSBS rate — for about $1.68 million of federal tax, instead of tax on the whole $46 million.

Three Common Scenarios

Scenario A — Selling QSBS before five years under the new rules.

Your Move	What It Costs You
Sell at 3 years	Only 50% excluded; remaining gain taxed at 28%
Sell at 4 years	75% excluded; remaining 25% taxed at 28%
Wait to 5 years	100% excluded; $0 federal capital gains tax

Scenario B — You live in a non-conforming state.

Your Situation	The Federal-vs-State Result
Fully excluded federally, live in California	$0 federal tax, but full gain taxed by California per Davis Wright Tremaine
Same gain, live in Texas or Florida	$0 federal and $0 state (no state income tax)

Scenario C — Your shares were never QSBS to begin with.

How It Happened	The Tax Consequence
Bought shares on secondary market	Not original issuance — no exclusion, full capital gains tax
Company was an S corp or LLC at issuance	Not a C corp — no exclusion available
Company’s gross assets exceeded the limit at issuance	Stock never qualified — full gain taxable

Does Your State Tax This?

Federal exclusion does not mean state exclusion. Many states tax the gain you just excluded federally, so a “tax-free” exit can still trigger a state bill. As of mid-2025, Davis Wright Tremaine reports that Alabama, California, Mississippi, New Jersey, and Pennsylvania did not conform to the federal QSBS exclusion, while Hawaii and Massachusetts conformed only partially.

California is the headline because so many startups live there. California does not follow Section 1202 at all, so a founder who pays $0 federal tax on a QSBS sale can still owe California tax at rates topping 13% on the very same gain. New Jersey is shifting — a June 30, 2025 bill allows QSBS exclusions there starting January 1, 2026, per the same source.

The planning response is location and entity structure. High-net-worth holders increasingly use non-grantor irrevocable trusts sited in no-income-tax states such as Alaska, Delaware, Nevada, South Dakota, and Wyoming to own QSBS, as Davis Wright Tremaine outlines. If you live in a non-conforming state, the move is to model the combined federal-plus-state result early — ideally years before a sale — and consult a tax attorney about trust situs.

Advanced Strategies: Stacking and Rollovers

Two strategies can multiply or extend the benefit, and both reward early action.

Stacking the cap with non-grantor trusts. Because the cap is per-taxpayer, per-issuer, giving QSBS to several separate non-grantor trusts — each treated as its own taxpayer — can create multiple $15 million caps on stock in the same company. A founder expecting a $60 million gain might spread shares across several trusts so that more of the gain fits under separate caps, as Davis Wright Tremaine describes. This requires careful trust drafting to avoid IRS aggregation challenges, so it is attorney territory, not DIY.

Section 1045 rollovers. If you must sell QSBS before hitting your holding milestone, Section 1045 lets you roll the proceeds into new QSBS within 60 days and carry your original holding period forward, as Keystone explains. This preserves your clock and defers the gain. The deadline is strict — miss the 60-day window and the rollover is lost — so coordinate with your advisor before, not after, you sell.

A third quieter tool is the gift. Gifting QSBS to family members transfers the shares with their QSBS status and holding period intact, spreading future gain across more taxpayers and more caps. Done before a big run-up in value, it can also reduce estate tax exposure.

How to Claim the QSBS Exclusion

You report the sale and then back out the excluded gain. First, report the full QSBS sale on Form 8949, the form for sales of capital assets, then carry the totals to Schedule D, just as you would for any stock sale through a Schedule D filing.

To claim the exclusion, you enter the excluded amount as a negative adjustment on Form 8949 using code Q in the adjustment column, which subtracts the excluded gain from your taxable total. The exclusion percentage you use — 50%, 75%, or 100% — depends on your stock’s issuance date and holding period as discussed above.

Keep three records permanently: proof the stock was acquired at original issuance, a QSBS attestation or representation letter from the company confirming it met the gross-asset and active-business tests, and documentation of your basis and acquisition date. The consequence of thin records is a disallowed exclusion on audit, so gather these at purchase, not at sale. If your situation involves trusts, multiple companies, or a state like California, this is the point to bring in a CPA or tax attorney — this article is educational and not a substitute for advice on your specific facts.

Mistakes to Avoid

Buying shares on the secondary market. Purchased-not-issued stock is not QSBS to you, so the whole gain is taxable.
Assuming an LLC or S corp qualifies. Only domestic C corporation stock qualifies; the wrong entity at issuance voids the break entirely.
Selling at three years without doing the math. You lose half the exclusion and pay 28% on the rest, when waiting could mean 100% at 0%.
Ignoring your state. A California resident can owe six figures in state tax on a federally excluded gain.
Forgetting which rule set applies. Treating pre-July 4, 2025 stock as if it had the $15 million cap overstates your exclusion and risks an IRS adjustment.
Missing the Section 1045 60-day window. Blowing the rollover deadline turns a deferred gain into a fully taxed one.
Losing your QSBS documentation. Without an attestation and basis records, the IRS can disallow the exclusion on audit.
Counting the holding period from the wrong date. For employees, the clock usually starts at option exercise, not grant — getting this wrong can cost the exclusion.

Do’s and Don’ts

Do:

Do confirm the issuance date first — it locks in whether old or new rules apply, and everything flows from that.
Do get a QSBS attestation at purchase — it is your audit defense and is far harder to obtain years later.
Do model federal and state together — because a non-conforming state can erase much of the benefit.
Do consider trust stacking before a sale — once the gain is locked in, the planning window is gone.
Do track each company separately — since the cap is per issuer, mixing them up loses exclusions.

Don’t:

Don’t sell early on impulse — the 28% trap makes pre-five-year sales costlier than they look.
Don’t assume your state conforms — guessing wrong on California-type states leads to a surprise bill.
Don’t ignore the 10× basis branch — high-basis investors may have far more exclusion room than $15 million.
Don’t skip Form 8949 code Q — failing to enter the adjustment means you do not actually claim the exclusion.
Don’t DIY a trust strategy — aggregation rules are technical, and errors invite IRS challenge.

Pros and Cons

Pros:

Potential $0 federal tax on millions of gain — the core benefit, now up to $15 million per issuer.
Per-issuer, per-taxpayer caps — because they stack across companies and trusts for serious multiplication.
Earlier exit flexibility under new rules — since 50% and 75% tiers reward three- and four-year holds.
Broader company eligibility — as the $75 million asset limit pulls in more growth-stage startups.
Compatible with estate planning — gifting QSBS moves both value and tax status to heirs.

Cons:

Five years is still long — because partial tiers carry a punishing 28% rate on the leftover.
State nonconformity — since states like California tax the gain regardless of federal exclusion.
C corp requirement — which means C corp double taxation while you hold.
Complex documentation — because a weak paper trail can sink the exclusion on audit.
Two parallel rule sets — as the July 4, 2025 split makes planning error-prone.

What to Do Next

Pin down your issuance date for every QSBS lot to determine which rule set and cap apply.
Calculate your holding milestones — mark your three-, four-, and five-year dates on a calendar.
Request or locate your QSBS attestation and basis records from each company now.
Run a combined federal-plus-state projection if you live in or near a sale, especially in a non-conforming state.
Talk to a CPA or tax attorney before any sale, gift, or trust move — especially for stacking or a Section 1045 rollover with its 60-day deadline.

FAQs

What is QSBS?

Qualified Small Business Stock is stock in a domestic C corporation, acquired at original issuance, that can let noncorporate holders exclude capital gains from federal tax under Section 1202 when held long enough.

How much gain can I exclude in 2025?

The greater of $15 million or 10× your basis for stock issued after July 4, 2025, or $10 million or 10× basis for stock issued on or before that date, per The Tax Adviser.

Do I still have to hold for five years?

No, not always under the new rules. Stock issued after July 4, 2025 can get 50% exclusion at three years and 75% at four years, but you still need five years for the full 100% exclusion.

Does California tax QSBS gains?

Yes. California does not conform to Section 1202, so it taxes the full gain even when you owe $0 federally, per Davis Wright Tremaine.

What rate applies to gain I cannot exclude?

28%. Any non-excluded QSBS gain, including the leftover at the three- and four-year tiers, is taxed at the 28% QSBS rate rather than the usual 20% long-term rate.

Can an LLC or S corporation issue QSBS?

No. Only stock in a domestic C corporation qualifies; an LLC or S corp must convert to a C corporation before issuing QSBS.

Does buying shares from another shareholder count?

No. QSBS must be acquired at original issuance directly from the company; secondary-market purchases do not qualify for the exclusion.

What company-size limit applies?

$75 million in gross assets for stock issued after July 4, 2025, up from $50 million, measured at issuance, per Grant Thornton.

When do the new $15 million caps adjust for inflation?

Beginning in 2027. Both the $15 million cap and the $75 million asset limit are indexed for inflation starting that year, per The Tax Adviser.

How do I claim the exclusion on my return?

On Form 8949 with code Q. Report the full sale, then enter the excluded gain as a negative adjustment using code Q, carried to your Schedule D.

Can I roll proceeds into new QSBS if I sell early?

Yes, under Section 1045. You can roll proceeds into new QSBS within 60 days and carry your holding period forward, per Keystone.

Can trusts multiply my exclusion?

Yes. Because the cap is per taxpayer per issuer, separate non-grantor trusts can each claim their own cap, though aggregation rules require careful drafting, per Davis Wright Tremaine.

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