Tax
QSBS and State Taxes: Where the Federal Exclusion Stops at the State Line
QSBS is a federal exclusion. California, Pennsylvania, Alabama and Mississippi tax the gain anyway, and New Jersey just switched sides for tax year 2026.
By 409.AI Team - 2026-08-24
# QSBS and State Taxes: Where the Federal Exclusion Stops at the State Line
The call usually comes about six weeks after the wire lands. A founder cleared a $9.5 million gain on stock issued to her in 2019, her CPA confirmed it qualifies under Section 1202, and her federal capital gains bill came to zero. Then California sent a notice, and the number on it was about $1.2 million.
Nothing went wrong with her QSBS analysis. Section 1202 is a federal statute, and it only ever promised a federal result. What happens next depends entirely on which state gets to tax the same gain, and that is a separate question with a separate answer in every state.
Most founders never have to think about this, because most states quietly follow along. The ones who do have to think about it tend to find out too late.
The federal side got more generous in 2025
The One Big Beautiful Bill Act rewrote the economics of Section 1202 for stock issued after July 4, 2025. Under the [current text of 26 U.S. Code 1202](https://uscode.house.gov/view.xhtml?req=granuleid%3AUSC-prelim-title26-section1202&num=0&edition=prelim), that newer stock qualifies for a tiered exclusion: 50% of the gain after a three-year hold, 75% after four years, and 100% after five. The per-issuer cap rose to the greater of $15 million or 10 times your adjusted basis, with the $15 million figure indexed for inflation for tax years beginning after 2026. The company's aggregate gross assets ceiling at issuance moved from $50 million to $75 million.
Stock issued after September 27, 2010 and on or before July 4, 2025 keeps the older deal, which is still a good one: a full exclusion after five years, capped at the greater of $10 million or 10 times basis, from a company under the $50 million gross assets test. We covered the mechanics of that changeover in [what the One Big Beautiful Bill Act changed about Section 1202](https://www.409.ai/articles/qsbs-one-big-beautiful-bill-act-section-1202-changes).
Every one of those numbers is a federal number. None of them binds a state.
Why most states follow anyway
The reason state QSBS treatment is usually a non-event comes down to plumbing. Most states build their individual income tax on top of federal adjusted gross income or federal taxable income. The Section 1202 exclusion operates above that line, so by the time a conforming state picks up your federal AGI, the excluded gain is already gone. The state never sees it and never taxes it. No election, no separate filing, no planning required.
That plumbing is why founders in Texas, Washington, and Florida have nothing to worry about (no individual income tax at all), and why founders in New York, Illinois, Colorado, and most of the rest of the country get the state benefit automatically without ever reading a state statute.
The exceptions are the states that either built their income tax on a different foundation or deliberately unplugged the pipe.
California unplugged it, and has not plugged it back in
California is the one that hurts most, and not because of anything unusual about California companies. It is about where the shareholders live.
California used to have its own partial exclusion under Revenue and Taxation Code Section 18152.5, worth 50% of the gain. A state appellate court found in Cutler v. Franchise Tax Board (2012) that the provision discriminated against interstate activity under the Commerce Clause, and the legislature responded with [Assembly Bill 1412](https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=201320140AB1412), signed in October 2013. That bill preserved the exclusion retroactively for sales in tax years beginning on or after January 1, 2008 and before January 1, 2013, then let the sections expire.
The practical result: for tax years beginning on or after January 1, 2013, California has no QSBS exclusion at all. A gain that is 100% excluded federally is fully includible in California taxable income and taxed as ordinary income. California's brackets top out at 12.3%, with an additional 1% surcharge on taxable income above $1 million, which is how you get to the 13.3% figure that shows up in exit models.
For our founder with the $9.5 million gain, that is the entire difference between a zero-tax exit and a seven-figure state bill.
Pennsylvania never had the plumbing
Pennsylvania's problem is structural rather than political. The state doesn't start from federal AGI. Its [personal income tax](https://www.pa.gov/en/agencies/revenue/resources/tax-types-and-information/personal-income-tax.html) is levied at a flat 3.07% against eight separately defined classes of income, and net gains from the disposition of property is one of them. There is no mechanism by which a federal exclusion reduces a Pennsylvania class of income, and the Pennsylvania code says nothing about Section 1202.
The rate keeps the damage modest. The same $9.5 million gain costs a Pennsylvania resident $291,650, which is real money but not the kind of number that changes whether you sell.
Alabama and Mississippi land in the same category. Neither state's code addresses Section 1202 and neither offers an equivalent exclusion, per a [survey of non-conforming states](https://fbtgibbons.com/section-1202-and-qsbs-a-survey-of-states-that-dont-conform-to-the-federal-treatment/) published by Frost Brown Todd in August 2025.
New Jersey just switched sides, effective this year
Here is the piece of this that is genuinely new, and that a lot of 2026 exit models still have wrong.
New Jersey was on the non-conforming list for the same reason as Pennsylvania: its gross income tax uses its own categories rather than federal AGI, so the federal exclusion had nowhere to attach. Founders who sold QSBS as New Jersey residents paid the state's gross income tax on the full gain, at a top rate of 10.75%.
That changed. [P.L. 2025, chapter 67](https://pub.njleg.gov/Bills/2024/AL25/67_.HTM), approved June 30, 2025, exempts from New Jersey gross income the net gains from the sale or disposition of qualified small business stock that qualifies for the federal Section 1202 exclusion. The law took effect immediately but applies to taxable years beginning on or after January 1 following enactment, which means tax year 2026.
The timing matters more than founders expect. A New Jersey resident who closed a QSBS sale in November 2025 owes the state tax. The same person, same stock, same buyer, closing in February 2026 does not. If you are sitting on qualifying stock in New Jersey and reading old guidance that says the state taxes it, that guidance is out of date.
The quieter problem: conformity dates
Even in states that do conform, there is a lag risk worth understanding, and OBBBA made it live.
States take one of two approaches to the federal code. Roughly 20 states and DC use rolling conformity, automatically tracking the current IRC. About 17 use static conformity, pinned to the code as of a fixed date, with 10 of those anchored around December 31, 2024 or January 1, 2025 according to the [Tax Foundation's analysis of OBBBA's state impact](https://taxfoundation.org/research/all/state/big-beautiful-bill-state-tax-impact/).
A static-conformity state pinned to a date before July 4, 2025 has not adopted the new QSBS tiers. Its residents still get whatever the pre-OBBBA version of Section 1202 gave them, which for stock acquired in, say, September 2025 could mean a state-level mismatch: full federal exclusion under the new rules, and a state that still applies the $10 million cap and $50 million asset test to the same shares. Updating a conformity date is usually routine, and most of these states do it every legislative session, but "usually" is not the same as "already happened." If your state is on a fixed date, check where that date sits relative to July 4, 2025 before you model a state benefit.
Residency is the variable, not incorporation
Founders conflate two things constantly. Where the company is incorporated has no bearing on which state taxes your gain. Gain on the sale of stock is gain on intangible property, and it generally follows the seller. California is explicit that a resident is [taxed on all income regardless of source](https://www.ftb.ca.gov/file/personal/residency-status/index.html). Your Delaware C corp does not put your gain in Delaware.
This is why the state question interacts with the trust planning founders are already doing. Gifting QSBS to a non-grantor trust sited in a different state can change which state taxes that slice of the gain, though the trust's own residency rules and the anti-abuse limits on stacking both apply. We walked through the federal side of that in [IRC 643(f) and QSBS trust stacking](https://www.409.ai/articles/qsbs-trust-stacking-irc-643f-treasury-guidance) and the gifting mechanics in [gifting startup equity in 2026](https://www.409.ai/articles/gifting-startup-equity-2026-estate-tax-exemption). None of it works as a last-minute maneuver, and a change of personal residency executed weeks before a signed LOI invites exactly the scrutiny you would expect.
What this changes about how you plan
Three things are worth doing before an exit rather than after.
Know your state's answer in writing, not by reputation. The list of non-conforming states is short and it moves, as New Jersey just demonstrated. A statement in a 2024 article about your state may be wrong today.
Model the state tax as a line item in the exit, not a footnote. If you are a California resident, the honest headline number on a qualifying $9.5 million gain is not zero. It is roughly $1.2 million, subject to your other income and filing status, and it should appear in the model next to the federal zero rather than in a disclaimer beneath it.
Keep the federal qualification airtight anyway. State non-conformity is a reason to plan around the state bill, never a reason to get sloppy about the federal one. That means clean documentation of the original issuance, the holding period, and the company's gross assets at issuance, which starts with knowing what your shares were worth and when. If your clock started at a SAFE conversion rather than the SAFE signature, [that distinction decides your five-year date](https://www.409.ai/articles/safes-qsbs-holding-period-conversion-section-1202). If you are selling before the clock runs out, [Section 1045 lets you roll the gain](https://www.409.ai/articles/section-1045-qsbs-rollover-defer-gain-early-sale) into replacement stock. And if the sale is a secondary rather than a full exit, [the approval and tax mechanics differ](https://www.409.ai/articles/secondary-sale-startup-shares-qsbs-tax-treatment).
The federal exclusion is one of the largest tax benefits available to a startup founder. It is also, in a short list of states, only half the story. Find out which half applies to you while you still have time to do something about it.
*409.ai issues [QSBS attestation letters](https://www.409.ai/products/qsbs) that document Section 1202 eligibility at the federal level, prepared and reviewed by valuation experts. State income tax treatment depends on your residency and your state's law, and this article is general information rather than tax advice. Confirm your own position with a qualified tax advisor.*