What QSBS actually does

Hold stock in a C-corporation that had no more than $75 million in gross assets when you acquired your shares, keep that stock for at least five years, and you can sell — even years later, even at a valuation in the hundreds of millions — and exclude up to $15 million or 10 times your basis, whichever is greater, from federal capital gains tax. Not defer. Exclude. The 2025 tax law made it more generous still, raising the exclusion by 50% from the prior $10 million cap and adding a partial benefit for owners who sell in as little as three years.

The Treasury estimates QSBS will cost about $67 billion over the next decade, which tells you how real the savings are. From 2012 to 2022, the provision let more than $140 billion in gains escape tax entirely. Critics call it a giveaway to the wealthy; advocates call it fuel for business creation. Either way, it's settled law, and Florida owners are entitled to use it.

Why the timing matters now

This isn't an abstract planning exercise. McKinsey estimates roughly 6 million boomer-owned U.S. businesses may change hands this decade, and about one in six of those owners will sell — potentially $5 trillion in proceeds. For a Florida owner approaching an exit, the difference between holding QSBS-eligible stock and holding almost anything else can be the entire tax bill on the sale. Business succession planning in Florida increasingly starts with one question: what kind of entity holds the value, and when did that clock start?

The entity problem most owners trip over

Here's where it gets uncomfortable. QSBS applies only to C-corporation stock. It never applies to an S-corp, an LLC taxed as a partnership, or a sole proprietorship as held. Fewer than 5% of U.S. businesses are C-corps, partly because C-corps face double taxation — the company pays tax on profits, then owners pay again on dividends or salary. So the QSBS owner faces a tradeoff: convert to a C-corp and start the five-year clock now, accepting the double-taxation drag, or stay a passthrough and keep the simpler tax treatment but forfeit the exclusion.

There's no universal right answer. A founder reinvesting every dollar into growth may barely feel the double-tax bite and gladly trade it for a tax-free exit. An owner taking heavy distributions today may decide the QSBS prize isn't worth the annual cost. That's a modeling decision, and it should happen with your CPA and attorney in the room — not the week before a letter of intent lands.

The architecture play: stacking

The piece most owners never hear about is stacking. Because the QSBS exclusion cap applies per taxpayer, an owner can gift shares into multiple non-grantor trusts — say, one for each child — and each trust claims its own exclusion. A founder might spread shares across four trusts and shelter $60 million, on top of a personal $15 million exclusion. Done right, stacking saves on income tax and estate tax at the same time, because the transfers into those trusts can be structured to use the owner's gift and estate tax exemption efficiently.

Done wrong, it's a target. Treasury's Kenneth Kies recently warned that the IRS is scrutinizing "abusive" stacking — cases where taxpayers set up several near-identical trusts purely to multiply the cap. The structures have to be real: distinct beneficiaries, genuine independence, proper administration. This is the intersection of tax law and Florida asset protection and estate planning, and it's exactly where a generic online trust form will get you in trouble.

A Florida example

Consider a hypothetical. A Tampa founder starts a logistics-software company as a C-corp in 2021, when the business holds well under $75 million in assets. By 2027 she's fielding acquisition interest at a $90 million valuation. Because she's held QSBS-eligible stock for more than five years, her own gain up to $15 million is federally tax-free. Years earlier, on her attorney's advice, she also gifted a slice of founder stock into separate irrevocable trusts for each of her two children, structured as non-grantor trusts. Each trust now carries its own exclusion. The result: a meaningful share of a nine-figure exit moves to the next generation with the federal capital gains bill at or near zero — and it happened because the architecture existed in 2021, not because anyone scrambled at closing.

That's the whole lesson. QSBS is federal law that reaches every state, but the trusts that stack it are built under state law, and in Florida that's where the planning actually happens.

Frequently asked questions

Does my Florida LLC qualify for QSBS?

Not as an LLC. QSBS applies only to C-corporation stock. An LLC would generally need to convert to or elect treatment as a C-corp, which restarts the analysis and the five-year clock. This is a core Florida LLC and asset protection planning question — the right structure for creditor protection isn't always the right one for QSBS, and balancing the two is the work.

How long do I have to hold the stock?

At least five years for the full exclusion. Under the 2025 law, partial benefits are now available starting at three years.

Can I really pay zero federal tax on a business sale?

On a qualifying portion, yes — up to $15 million or 10x your basis, whichever is greater, per taxpayer. State tax and the details of your basis still matter, and Florida has no state income tax, which makes the federal exclusion even more valuable here.

Is stacking legal?

Stacking across genuinely separate trusts is a recognized strategy, but the IRS is actively reviewing cookie-cutter arrangements. The structures must be substantively distinct, which is why this belongs with a Florida estate planning lawyer, not a template.

The bottom line

QSBS rewards the owner who built the structure years before the exit — the same principle behind every other kind of asset protection. The architecture has to exist before you need it. If you own a Florida business and a sale is anywhere on your horizon, the time to model your entity and your trusts is now, while the five-year clock can still work in your favor.

If you'd like to know whether your business is positioned for QSBS, schedule a consultation or download our QSBS Eligibility Checklist. Call 866.725.2818 or visit aspirelegal.com.

This article is for educational purposes only, reflects Florida law, and does not create an attorney-client relationship or constitute legal or tax advice. Consult a qualified Florida attorney and tax adviser about your specific situation.