QSBS Tax Exclusion Got Way Better in 2026

A quiet change in mid-2025 just made one of the best tax breaks for startup founders significantly more flexible. If you acquired qualified small business stock after July 4, 2025, you no longer need to wait five full years to get meaningful tax exclusion on your gains.

The One Big Beautiful Bill Act, signed into law on July 4, 2025, introduced a tiered holding period structure for QSBS. Hold for three years and you can exclude 50% of your gain. Make it to four years and that jumps to 75%. Hit the five-year mark and you get the full 100% exclusion, up to $15 million per issuer.

For founders who’ve been sitting on vested stock from 2019 or earlier, nothing changed. You were already eligible for the 100% exclusion under the old five-year rule. But for anyone who acquired C-corp stock after July 4, 2025, the new law creates real optionality around exit timing that didn’t exist before.

Here’s what actually changed, who benefits, and what it means if you’re planning an exit in 2026 or beyond.

What the OBBBA Actually Changed

The One Big Beautiful Bill Act made three major adjustments to Section 1202 of the tax code, all effective for stock acquired after July 4, 2025.

First, it introduced the tiered holding period. Before this law, you either held for five years and got 100% exclusion or you sold early and got nothing. Now there’s a graduated benefit structure. Three years gets you 50% exclusion. Four years gets you 75%. Five years still gets you 100%.

Second, it raised the exclusion cap from $10 million to $15 million per issuer. That cap will be indexed for inflation starting in 2027. The alternative calculation—10 times your aggregate adjusted basis—also still applies, and you get whichever is greater.

Third, it increased the asset threshold for qualifying businesses from $50 million to $75 million. That means more later-stage companies can now issue QSBS-eligible stock without immediately disqualifying themselves.

Everything else about QSBS stayed the same. The active business requirement, the prohibited industries list, the C-corp structure requirement, the original issuance rule—all unchanged.

Why the Three-Year Mark Matters Now

The most immediate impact is on exit timing decisions for founders who acquired stock in mid to late 2025.

Hypothetical example:

You joined a Series A startup in August 2025 as an early employee. You exercised your options immediately and paid for 100,000 shares at $0.50 each. The company meets all the QSBS tests—it’s a C-corp, it had under $75 million in assets when you acquired your stock, and it’s in a qualified industry. By August 2028, you’ll hit the three-year mark. If the company gets acquired for $50 per share at that point, your gain is $4,950,000. Under the old rules, you’d owe long-term capital gains tax on the full amount—roughly $1,178,100 in federal tax. Under the new rules, you can exclude 50% of that gain, cutting your federal tax bill to about $589,050.

That’s a meaningful difference, and it arrives two years earlier than the old five-year cliff.

The four-year mark creates a similar step-up. If you can hold one more year past the three-year threshold, you exclude 75% instead of 50%. On a $5 million gain, that’s the difference between $589,050 in federal tax and $294,525.

The five-year threshold still delivers the full 100% exclusion, assuming you stay under the $15 million cap. But now there’s real value in partial holds if you can’t make it all the way to five years.

What This Means for Stock Acquired Before July 4, 2025

If you acquired your QSBS before the law changed, you’re still operating under the old rules. That means you need to hold for five full years to get any exclusion at all. There’s no partial benefit at three or four years.

For founders who crossed the five-year mark before 2025, nothing about the OBBBA changes your tax position. You were already eligible for 100% exclusion up to $10 million. The new $15 million cap doesn’t apply retroactively to stock acquired under the old rules.

But if you acquired stock in 2023 or 2024 and you’re approaching the five-year mark in 2028 or 2029, you’re in a strange position. You don’t get the tiered benefits that post-July 2025 stock gets, but you also don’t get the higher $15 million cap. You’re locked into the old structure.

This creates a timing arbitrage for founders who have the ability to acquire new stock. If you’re raising a new round or restructuring your cap table, stock issued after July 4, 2025 comes with better rules than stock issued before that date.

What Still Disqualifies You

The OBBBA didn’t touch the core qualification rules, and those rules still disqualify a significant number of companies.

Your company must be a C-corporation. LLCs, S-corps, and partnerships don’t qualify, even if they meet every other test.

The company’s gross assets must have been $75 million or less immediately after your stock was issued. If the company raised a large round right before you acquired your shares and crossed that threshold, your stock doesn’t qualify. This is an “at issuance” test, not a “during the holding period” test. The company can grow past $75 million after you acquire your stock and you’re still fine.

The company must use at least 80% of its assets in an active trade or business. Passive holding companies don’t qualify.

Certain industries are completely excluded. If the company’s primary business is financial services, hospitality, farming, mining, or professional services like law or consulting, the stock doesn’t qualify. Real estate development is also out, though real estate technology companies can sometimes qualify if they’re not directly developing property.

You must acquire the stock directly from the company in exchange for money, property, or services. Secondary purchases from other shareholders don’t count, with very limited exceptions.

None of these rules changed with the OBBBA. The tiered holding period and higher caps only matter if your stock qualifies in the first place.

The Tricky Part About Timing an Exit Now

The new structure creates real tension around exit timing if you’re between year three and year five.

If you’re at year three and you get an acquisition offer, you’re now comparing a 50% exclusion today against a 75% exclusion in one year or a 100% exclusion in two years. That’s a meaningful spread, but it’s not infinite. You’re no longer choosing between “pay full tax now” and “pay zero tax in two years.”

The math depends heavily on the size of your gain relative to the $15 million cap. If your gain is going to be $8 million, the difference between 50% exclusion and 100% exclusion is $952,000 in federal tax. If your gain is going to be $30 million, you’re capped at $15 million excluded either way, so the difference between 50% and 100% exclusion is the tax on $7.5 million—about $1,785,000.

But you also have to factor in the risk that the offer disappears, the company’s valuation drops, or the tax law changes again. The OBBBA could be amended. The exclusion caps could be reduced. The holding periods could be extended. None of that is likely in the near term, but it’s not impossible.

There’s also the question of whether you’ve already used part of your $15 million cap on a prior QSBS sale from the same issuer. The cap is per issuer, not per sale. If you sold $5 million of QSBS from the same company two years ago and excluded the full amount, you only have $10 million of cap left for this sale.

What Happens at the State Level

The $15 million exclusion and the tiered holding periods are federal rules. State tax treatment of QSBS varies widely, and most states have not yet issued guidance on how they’ll handle the OBBBA changes.

California, New Jersey, Pennsylvania, Alabama, and Mississippi don’t conform to the federal QSBS exclusion at all. If you’re a resident of one of those states, you’ll owe state tax on your full gain regardless of how much you exclude federally.

Other states conform to varying degrees. Some follow the federal exclusion exactly. Others cap the exclusion at a lower amount or apply their own holding period rules. A few states that previously conformed to the old $10 million cap may not automatically adopt the new $15 million cap without updating their own statutes.

It’s worth checking your state’s current position before assuming the federal benefit flows through automatically.

Worth Looking Into

It’s worth checking whether your company’s most recent 409A valuation or financing round pushed gross assets above $75 million at any point when stock was issued. If you’re not sure, ask your CFO or outside counsel.

A good starting point is confirming your exact acquisition date and whether you acquired your stock directly from the company or through a secondary transaction. If you exercised options, check whether you filed an 83(b) election and when.

It’s worth looking at whether you’ve previously sold QSBS from the same issuer and how much of your $15 million cap you’ve already used. If you’re not sure, your tax preparer should have records from the prior sale.

If you’re planning an exit in the next 12 to 24 months and you’re approaching a three-year or four-year anniversary, it’s worth modeling the tax difference between selling now versus waiting for the next tier. The math changes significantly depending on the size of your gain and how much cap room you have left.

If you’re in California, New Jersey, Pennsylvania, Alabama, or Mississippi, it’s worth confirming that you’ll owe state tax on the full gain regardless of the federal exclusion. Don’t assume the federal benefit eliminates your entire tax bill.

Have questions?

If you’ve been holding QSBS and you’re trying to figure out how the OBBBA changes your exit math, drop a comment. This is one of those areas where the details matter a lot and the generic advice doesn’t always fit.

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Disclaimer:

This is educational content from Silly Money, not tax, legal, or investment advice. Taxes are complicated and your situation is unique. Talk to a qualified professional before making decisions based on anything you read here.