The New QSBS Rules: What Changed for Founders and Investors in 2025?

Sep 16

6 min read

Key takeaways

The One Big Beautiful Bill Act (OBBBA) made QSBS more generous in three ways: a shorter path to the exclusion, a larger exclusion, and a higher company-size ceiling.
The new rules apply to qualifying stock acquired after July 4, 2025. Stock acquired on or before that date keeps the old rules. Your acquisition date is now the hinge everything turns on.
The biggest shift: you may no longer have to wait five years. A tiered exclusion now gives 50% at three years, 75% at four, and 100% at five.
What did not change: the qualification requirements. The benefit got bigger — the rules to earn it did not.

Tax law changes are usually a mixed bag. This one isn't. For qualifying founders and investors, the 2025 changes to Section 1202 are close to unambiguously good news — and for a provision that was already one of the most powerful incentives in the code, that's saying something.

But "more generous" doesn't mean "automatic," and the fine print rewards people who pay attention. The changes hinge on when stock was acquired, which means two shareholders in the same company can now end up with very different outcomes. Here's what actually changed, and what to do about it.

What changed, in one breath

OBBBA moved three levers, all for qualifying stock acquired after July 4, 2025:

Holding period — a new tiered exclusion, so you can benefit before year five.
Exclusion amount — the per-issuer dollar cap rose from $10 million to $15 million.
Company size — the gross-assets ceiling rose from $50 million to $75 million.

Now the parts that matter.

Do you still have to wait five years for QSBS?

Not necessarily — and this is the change founders should care about most.

Historically, you generally had to hold qualifying stock for more than five years to get any QSBS exclusion. It was all-or-nothing: sell at year 4.9 and you got zero. For stock acquired after July 4, 2025, that cliff became a staircase:

Holding period	Potential exclusion
Less than 3 years	0%
3 years	50%
4 years	75%
5+ years	100%

Here's why I think this matters more than the headline dollar increases. In the real world, exits don't wait politely for year five. An acquirer shows up when they show up. Under the old rule, a great offer at year four forced an ugly choice between a life-changing deal and a massive tax bill. Now a founder or investor who exits at year four may already have a meaningful exclusion in hand — and real options to weigh from there.

For companies where a five-year hold was never realistic, the tiered structure doesn't just soften the math. It puts QSBS on the table for people who previously would have written it off entirely.

Why your acquisition date is now the most important date on your cap table

Because the new rules apply only to stock acquired after July 4, 2025, that single date now determines which rulebook your shares play by.

Two shareholders in the same company can have different QSBS treatment. So can the same shareholder holding different blocks of stock acquired at different times — one lot under the old five-year rule, another under the new tiered rule. The company didn't change. The acquisition date did.

This is where I get insistent, because I've watched it go wrong from the inside. In 14 years running in-house corporate tax departments, I learned how quickly institutional knowledge evaporates — people leave, systems migrate, and the person who knew exactly when and how each block of stock was issued is gone. QSBS is uniquely exposed to this, because the payoff is years away and nobody feels urgency in the moment.

The new lot-level distinctions make accurate, dated equity records more valuable than they've ever been. If you can't cleanly prove when each block of stock was acquired, you can't cleanly prove which exclusion it qualifies for. Reconstructing that under acquisition-diligence pressure, years later, is exactly how good QSBS positions quietly get lost.

How much can you exclude now?

For qualifying stock under the new rules, the per-issuer dollar cap increased from $10 million to $15 million, subject to the statute's detailed limits. The alternative limitation — generally 10 times your adjusted basis in the stock — still applies and can be far larger for investors who put in real capital.

The part people underestimate is that this limit is per issuer, measured at the taxpayer level. It isn't one $15 million allowance spread across everything you own. It can apply separately to each qualifying company. (I wrote about the moment this clicked for me reviewing an investor's K-1s and realizing the exclusion was stacking across a whole portfolio of qualifying companies in [What Is QSBS? A Founder's Guide to Section 1202 LINK].)

How big can the company be when it issues qualifying stock?

The gross-assets ceiling rose from $50 million to $75 million for stock issued after July 4, 2025, with inflation adjustments scheduled to begin after 2026. Practically, that lets companies keep issuing qualifying stock later into their growth than before.

One trap worth repeating, because it catches smart people: a $75 million valuation is not the same as $75 million of gross assets.

This is NOT the gross-assets test	This IS closer to it
Your latest funding-round valuation	The corporation's aggregate gross assets
Enterprise value	Measured under Section 1202's own rules
Annual revenue	Tested immediately before and after issuance

A company can carry a fundraising valuation well above $75 million without necessarily having $75 million of gross assets for Section 1202 purposes. Don't disqualify yourself, or assume you qualify, based off the wrong number.

What didn't change?

This is the part I want founders to sit with, because the good news creates a temptation to get sloppy. OBBBA expanded the benefit. It did not touch the requirements to earn it.

Still true, among other things:

The issuer generally must be a domestic C corporation. LLC interests and S corporation stock still aren't QSBS.
Stock generally must be acquired at original issuance, subject to exceptions.
The company must run a qualified trade or business: certain service, financial, farming, and hospitality businesses remain excluded.
The active-business requirements still apply throughout the holding period.
Redemptions around a stock issuance can still blow the whole thing up.

And honestly, the most expensive QSBS mistake I see has nothing to do with any statutory subtlety. It's inattention like not setting things up correctly at the start, then not monitoring the company as it grows until, somewhere along the way, the status quietly slips. A bigger benefit is a bigger thing to lose. The new rules raise the stakes of paying attention; they don't lower them.

What this means for you, depending on where you are

Forming a company: Entity choice deserves a real conversation, and potential QSBS eligibility is now an even stronger factor favoring a C corporation for businesses expecting outside investment and meaningful appreciation. (My own bias on how to start is in [LLC, S Corporation, or C Corporation? Why Entity Choice Matters for Founders].)
Converting an LLC to a C corporation: Document the conversion and your QSBS starting point. Don't assume your LLC years count toward the holding period.
Issuing stock: Record the issuance date and the company's gross assets at issuance. A buyer's diligence team may ask about it many years from now. This is commonly called maintaining the cap table.
Raising capital: Revisit the gross-assets test and tighten up your lot-level cap-table records.
Approaching an exit: Analyze each shareholder's stock separately, by lot. Different dates and circumstances can produce genuinely different results — and don't start this the week of closing.

A concrete example

Say a founder acquires qualifying QSBS on August 1, 2025. If all the other requirements are met, the new framework creates milestones at:

August 1, 2028 → 50% exclusion
August 1, 2029 → 75% exclusion
August 1, 2030 → 100% exclusion

Now imagine an acquisition offer lands in July 2029 which is weeks before the four-year mark. Suddenly the timing of the transaction carries real tax consequences, and a few weeks could be worth a lot.

Tax shouldn't dictate whether a good business deal gets done. But you can't weigh a tax consequence you don't know exists, which is exactly why this belongs in the conversation before the transaction documents are drafted, not after.

The real takeaway

QSBS is a planning issue, not a tax-return issue and the 2025 changes make that more, not less true. The benefit now touches entity formation, equity issuance, fundraising, operations, and exit timing, across a lifecycle that no single tax return captures.

The rules got more generous. The reward for planning early got bigger right along with them.

Where to start

Download the Founder's QSBS Checklist — 12 questions to pressure-test your shares and your company's eligibility with your advisors. [Get the Founder's QSBS Checklist →]

Or if you're weighing a raise, a conversion, or an exit and want to know how these new rules land on your specific facts — let's talk. This is the kind of strategy work I do at Meliora: high-touch, founder-first, and thinking two moves ahead. [Book a call →]

This article is for general educational purposes and does not constitute tax or legal advice. Section 1202 contains numerous technical requirements and limitations, and the 2025 changes apply based on specific facts including acquisition date. Consult your tax and legal advisors regarding your circumstances.