The report from a pair of progressive research groups found that the number of individuals in Massachusetts with at least $50 million in total wealth grew from 1,954 in 2022 — the year voters adopted the 4 percent surtax on household income above $1 million — to 2,642 in 2024, a 35.2 percent increase.
Source: Report: Mass. Home to More Millionaires Despite New Surtax – Banker & Tradesman