Justice Serge Georges Jr. stressed that the error was a material misrepresentation that could mislead voters, resulting in the petition’s exclusion from the November ballot.

Broader implications include how ballot language integrity, the AG’s role, and Massachusetts tax policy priorities will be debated in future cycles.

The court found the AG’s summary misleading about the measure’s effect, specifically that it would reduce capital gains taxes in addition to personal income taxes.

The court’s ruling leaves no mechanism to fix the summary after signatures, and issuing a revised summary could raise questions about the validity of collected signatures.

The Attorney General’s office defended the summary as accurate, arguing the measure does not amend capital gains tax rates, while critics contended the summary obscured the fiscal impact on capital gains taxes.

The decision states there is no mechanism under state law to revise the faulty summary after signatures were collected, making the measure unfit for the ballot and prompting calls for broader reforms to ballot language and preparation.

Proponents and supporters argued polling showed broad backing for the tax cut and framed the ruling as disenfranchisement, while opponents and some lawmakers warned the decision deprives voters of a chance to weigh in on affordability and competitiveness.

The ruling has spurred ongoing debate about the ballot initiative process, the AG’s role in summarizing measures, and Massachusetts tax policy, with some planning to reintroduce the measure or pursue revised language in future cycles.

The income tax question was among 11 ballot questions certified in January for potential inclusion on the 2026 ballot.

The Massachusetts Supreme Judicial Court ruled that a ballot measure to gradually cut the state income tax was ineligible for the November 2026 ballot because the Attorney General’s summary significantly misled voters about long-term capital gains taxes.

This is a developing story and will be updated as new details emerge.

Additional updates are anticipated as the implications for ballot language and petition validity become clearer.