Where Federal QSBS Exclusions Still Face State Tax

Alabama, California, Mississippi, and Pennsylvania are the clearest states that may tax gain excluded federally under Section 1202 in 2026. Maine and Oregon reportedly decoupled during 2026, Hawaii reportedly allows only a 50% exclusion, and Illinois and Vermont remain unresolved. Rhode Island was described only as likely to decouple. Transaction dates, residency, sourcing, and each state’s effective-date rules can change the result.

This is a secondary-source screening guide, not a verified fifty-state statement of law. ITEP’s August 2026 state QSBS map does not explain every jurisdiction shown, and the available evidence does not include current statutes, guidance, forms, and instructions for every state.

Choose a state, holding period, expected gain, and your state tax rate to screen the potential exposure.

The calculator does not supply state tax rates because the evidence provided does not establish them. For a nonconforming state, it estimates the amount of federally excluded gain that may return to the state tax base, then applies a rate entered by the user. It cannot account for state basis, deductions, sourcing, graduated brackets, taxpayer type, or return-specific adjustments.

The Best-Supported 2026 State Classifications

ITEP identified Alabama, California, Mississippi, and Pennsylvania as income-tax states that denied the federal exclusion before the 2026 changes. Its reporting also describes Maine and Oregon as having decoupled during 2026 and Hawaii as providing a 50% exclusion. ITEP’s policy analysis explains these classifications.

“Taxes QSBS gains” does not mean every dollar faces one fixed state rate. Nonconformity means some or all of an amount excluded federally may be restored to the state tax base. State basis, deductions, residency, sourcing, gain classification, filing status, and other income still affect liability.

For states not specifically classified here, the supplied evidence is insufficient to give a reliable 2026 verdict. They are marked for primary-law review rather than assumed to conform.

Federal Exclusion Comes Before State Conformity

Section 1202 is a federal rule for qualified small business stock. A qualifying noncorporate taxpayer may exclude gain, but no state is compelled to recognize that federal exclusion.

At a high level, the stock generally must have been acquired at original issuance from a qualifying C corporation. The issuer, shareholder, and stock must satisfy the applicable gross-assets, active-business, holding-period, and other statutory requirements.

For qualifying newer stock under current federal law, the exclusion is:

• 50% after at least three years;
• 75% after at least four years; and
• 100% after at least five years.

The federal per-issuer limit is generally the greater of the applicable statutory dollar cap or ten times the shareholder’s adjusted basis. The dollar cap varies according to when the stock was acquired. The percentages, limits, and eligibility rules appear in the current text of IRC Section 1202.

A state may start with federal adjusted gross income or taxable income while applying its own additions, subtractions, definitions, or conformity date. A rolling-conformity state may incorporate federal amendments automatically. A static-conformity state may remain tied to an earlier version of the Internal Revenue Code until its legislature acts.

That distinction matters after the 2025 federal amendments. A state could recognize an older exclusion for stock held five years without recognizing the newer three- and four-year tiers. A general statement that a state conforms does not establish that it follows every part of current federal law.

Four States Have Long Denied The Federal Exclusion

Alabama, California, Mississippi, and Pennsylvania are the strongest-supported longstanding nonconforming states. A later commercial summary likewise groups the four together and reports that California provides no QSBS exclusion for tax years beginning on or after January 1, 2013. Its state comparison describes the California and New Jersey rules.

Alabama

Available reporting says Alabama does not provide the federal Section 1202 exclusion or an equivalent exclusion. A shareholder within Alabama’s taxing jurisdiction may therefore have state-taxable gain even when the federal return excludes it.

California

California is consistently identified as not recognizing the federal QSBS exclusion. The supplied secondary evidence reports no California exclusion for tax years beginning on or after January 1, 2013.

The federal exclusion cannot simply be carried into the California calculation. State basis, residence, sourcing, other income, and available adjustments still determine the final liability.

Mississippi

Mississippi is reported to provide neither the Section 1202 exclusion nor an equivalent state exclusion. Federally excluded gain may consequently enter its state calculation.

Pennsylvania

Pennsylvania is also reported not to incorporate the federal exclusion. Its own income classifications, basis rules, and return mechanics must be applied rather than inferred from federal terminology.

Maine And Oregon Reportedly Decoupled During 2026

Maine and Oregon were reported to have enacted decoupling measures in 2026. These classifications require a second question: whether the new rule applies to the particular sale and recognition event.

A third-party tax summary states that Oregon’s measure was signed on April 9, 2026, and applies to stock sales in 2026 and later. It states that Maine decoupled on April 10, 2026. Those reported dates are not substitutes for the enacted legislation.

For Oregon, confirm treatment of sales before the signature date and any installment payments, deferred consideration, or other later recognition. For Maine, the evidence supplied does not establish that every sale during calendar year 2026 receives identical treatment.

The relevant dates may include the sale date, gain-recognition date, taxable year, enactment date, statutory effective date, and any retroactive or transition provision.

Illinois, Vermont, And Rhode Island Are Not Confirmed

ITEP reported on June 5, 2026, that Illinois and Vermont were decoupling. The supplied evidence is enough to flag both states but does not establish final enacted language, exact scope, or effective dates through primary authority.

Before treating either state as nonconforming, confirm whether legislation was enacted, whether it reverses the entire exclusion or only the 2025 expansion, which taxable years it covers, and whether previously issued stock receives transition treatment.

Rhode Island was described only as likely to decouple. An expected legislative outcome is not enacted law, so Rhode Island remains unconfirmed.

Hawaii Allows A Reported Partial Exclusion

Hawaii is reported to allow a 50% QSBS exclusion rather than the full federal exclusion. Part of a federally excluded gain may therefore remain in the Hawaii calculation.

That does not establish that Hawaii taxes exactly half of every federally excluded gain. The relevant state-law version, acquisition date, holding period, basis, taxpayer type, and transaction facts still control. The calculator consequently does not produce a Hawaii liability estimate.

New Jersey And New York Reportedly Retained Favorable Treatment

New Jersey reportedly began recognizing the federal Section 1202 exclusion for taxable years beginning on or after January 1, 2026. The taxable year matters rather than the closing date viewed alone.

The enacted provision should be checked for the relevant taxpayer, stock, holding period, federal limitation, and version of Section 1202. The supplied evidence does not independently establish that every element of the 2025 federal expansion applies.

New York reportedly considered decoupling but withdrew the proposal. Current reporting says federal-style recognition continues, although an actual return should follow enacted rules and official instructions rather than an older legislative alert.

No-Income-Tax States And Washington Need Separate Labels

A nationwide third-party directory describes Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, and Wyoming as imposing no state individual income or capital-gains tax. The directory provides nationwide screening classifications, not official state guidance.

Having no broad individual income tax is different from conforming to Section 1202. Another state could still assert a residency or sourcing claim, and trusts or other taxpayer types may require separate analysis.

Washington has no broad individual income tax but imposes a capital-gains excise tax. Available secondary reporting says that levy includes an exclusion for qualifying QSBS. A Washington seller must analyze the sale under that levy rather than stopping at the absence of a broad income tax.

The supplied evidence is insufficient to classify Massachusetts or the District of Columbia. One directory labels Massachusetts partially conforming without explaining the limitation and describes the District only as subject to recent changes. Both require current primary-law review.

The Shareholder’s Tax Connections Matter More Than Incorporation

A startup’s incorporation state does not by itself determine the shareholder’s state QSBS treatment. A Delaware corporation can operate across several states and have shareholders taxed elsewhere.

The shareholder’s residence and applicable sourcing rules are generally more relevant, according to a 2026 CPA guide to state QSBS treatment. Review the seller’s residence when gain is recognized, part-year residence, prior residence, trust residence or administration, taxpayer type, and any state asserting a sourcing connection.

Moving before an exit does not automatically remove state tax. Domicile, part-year reporting, transaction timing, deferred recognition, trust residency, and sourcing can remain disputed or fact-dependent.

A Defensible Pre-Sale Review Requires Five Checks

First, establish federal eligibility. Confirm original issuance, eligible taxpayer status, C-corporation status, gross assets, qualified business activity, holding period, adjusted basis, and prior exclusions involving the same issuer.

Second, identify every state with a plausible claim to the gain. Do not substitute the issuer’s incorporation state for the shareholder’s residence and sourcing analysis.

Third, determine the state’s conformity method and the version of Section 1202 it follows. For stock held three or four years, verify that the state adopted the newer federal tiers rather than only the older five-year treatment.

Fourth, match 2026 legislation to the transaction’s sale date, recognition date, taxable year, installment terms, and transition provisions. This is especially important for Maine and Oregon and essential before classifying Illinois or Vermont.

Fifth, model the actual state return. The calculation may require additions, subtraction modifications, state basis adjustments, deductions, sourcing allocations, separate trust rules, and estimated-tax payments. A conformity label alone cannot establish the tax due.

Preserve issuance records, stock purchase agreements, board approvals, capitalization records, proof of payment, corporate tax-status records, gross-assets support, qualified-business documentation, basis schedules, transfer records, prior exclusions, and closing documents. Those records may support both the federal exclusion and any state treatment claimed.

For a material 2026 sale, confirm the result against enacted statutes, effective-date clauses, revenue-department guidance, current forms, and transaction-specific advice. The defensible screening result remains tiered: four longstanding nonconforming states; Maine and Oregon as reported 2026 additions; Hawaii as partial; Illinois and Vermont as unresolved; and Rhode Island as unconfirmed.