States move to shut door on startup tax break expanded under Trump's OBBBA

A federal tax incentive long favored by venture capitalists and startup founders is drawing fresh fire from state governments, tax policy analysts, and critics who argue it overwhelmingly benefits the ultra-wealthy while adding unnecessary bloat to the tax code.

Maine and Oregon became the latest states to decouple from the federal qualified small business stock, or QSBS, exclusion last month, requiring investors to pay state income tax on gains that are sheltered at the federal level.

The moves come on the heels of Congress expanding the incentive under the One Big Beautiful Bill Act, raising the exclusion ceiling from $10 million to $15 million and widening the gross asset threshold for qualifying companies from $50 million to $75 million. Those expansions took effect for stock issued on or after July 4, 2025.

Read more: How OBBBA changes have made QSBS more interesting for business owners

For financial advisors working with entrepreneurial clients, founders, and early-stage investors, the patchwork of state rules is adding new urgency to residency and trust planning conversations – and prompting some high earners to consider relocating.

"Tax policy has consequences, both good and bad, and I think that the states need to figure out what makes the most sense for them," David Blum, partner and chair of Akerman's national tax practice group told CNBC. "Someone looking for a substantial exit could have multiple homes already."

The QSBS exclusion, introduced in 1993 during the Clinton administration, was designed to encourage investment in small, early-stage companies by allowing investors and founders to exclude capital gains from the sale of qualifying C-corporation stock. But research published last year by the Treasury Department revealed the break is more costly and lopsided than previously reckoned, with a finding that taxpayers earning more than $1 million account for nearly 75% of the gains excluded.

In a critique of the QSBS, the Tax Foundation cited the Joint Committee on Taxation's estimate that the OBBBA's expansion of the exclusion will cost an additional $17.2 billion over the 2025–2034 period, adding to the $44.5 billion the exclusion was already projected to cost under prior law. State revenue offices have taken notice.

Oregon's legislation bars investors from claiming the exclusion starting in tax year 2026 and is expected to protect $39 million in state revenue in the current budget cycle, rising to $83 million in 2029–31. Maine's legislation covers investments made after July 3, 2025, and is estimated to eventually protect $7.3 million in annual state tax revenue. The funds are earmarked for priorities including expanded earned income tax credits and school funding.

Maine, Oregon, Alabama, California, Mississippi, and Pennsylvania now all require investors to pay state income tax on gains that qualify for the federal QSBS exclusion. A bid by the District of Columbia Council to follow suit was blocked by Congress. Efforts in New York and Washington state did not advance.

The backlash against QSBS reflects a wider debate about who the incentive actually serves. Tax policy researchers across the political spectrum have raised concerns about how it's designed.

The Tax Foundation panned the exclusion for distorting business structure decisions, noting that the requirement to organize as a C corporation puts other entity types – LLCs and S-corps among the most commonly used by small businesses – at a disadvantage. The institute also flagged how the gross asset test can lead companies to artificially delay expansion to let investors snap up eligible shares, meaning investment decisions can be shaped by the pursuit of tax benefits rather than optimal returns.

"No, the superrich do not need a bigger tax break," Daniel Hauser of the Oregon Center for Public Policy wrote in policy commentary cited during the Pacific Northwest state's legislative debate. Hauser argued that a Portland-based venture capitalist investing in a California or New York startup could claim the Oregon QSBS tax break even if the investment produced no economic benefit to Oregon.

For advisors, the evolving state landscape is creating real planning complexity. Attorney Steve Oshins told CNBC that clients with multi-state residency have options, including the use of incomplete non-grantor trusts established in favorable jurisdictions such as Nevada, Delaware, or Wyoming, where trust income is not taxed. A resident of Oregon, for example, could transfer shares to such a trust – provided the trust is not administered in Oregon and none of its trustees live there – to shield gains from state income tax.

But Maine's rules are stricter. Non-grantor trusts are subject to state income tax if funded by a Maine resident or created under a Maine resident's will, Oshins said, limiting the planning options available to clients in that state.

The most direct solution, lawyers say, is relocation – though that comes with its own complications. Residency changes require more than token gestures to withstand state tax authorities' scrutiny.

Blum noted that clients cannot simply update a voter registration and spend 183 days out of state. "When it comes to changing residency and your domicile, you really have to move and uproot your life," he said.

Read more: Relocating to a tax-friendly state? Check with your financial advisor first

That nuance creates an opening for advisors. Clients approaching a significant exit – whether from a startup stake or a co-founded business – need guidance not just on the federal QSBS rules, but on the changing split in states' overall tax-friendliness. 

Meanwhile, critics of QSBS argue that policymakers should redirect savings from scaling back or eliminating the exclusion toward tax policies with broader economic impact, such as full expensing of capital investment – a provision that directly lowers the cost of capital without distorting organizational decisions.