How does Massachusetts state income tax and unemployment insurance work in 2026?

For most employees the flat 5% is the whole story: a Boston hire earning a standard salary has 5% of taxable pay withheld for the state, and you register with the Massachusetts Department of Revenue to remit it. Massachusetts also taxes most short-term capital gains separately, but that lands on the individual return, not your payroll run.

The flat rate is deceptively simple to administer compared with a graduated state. You do not model marginal brackets, and you do not reconcile a state-specific bonus rate against a wage table. What you do carry is a real withholding obligation that no-income-tax states like New Hampshire next door do not have, plus the surtax handling for your highest earners. The Massachusetts wage and overtime rules sit on top of this same payroll run, as do the state's paid family and sick leave contributions.

The threshold matters for how you communicate cost to a senior hire. Because the $1,107,750 line is indexed to inflation under M.G.L. c. 62, it moves every year, so last year's figure is not this year's. A package that clears the threshold means 9% on the portion above it, not on the whole salary.

For payroll itself, the practical point is that your standard withholding does not change. You run the flat 5%; the 4% is the employee's reconciliation. Getting that distinction right in the offer conversation saves a surprised email in April. For comparison, see how New York and Connecticut handle their own high-earner surtax mechanics in our New York state tax guide.

You pay UI on the first $15,000 of each employee's wages; everything above that in the calendar year is not subject to the state tax. Because the base is low, the annual UI cost per employee caps out quickly, but the rate you pay depends on your experience rating once you are out of the new-employer window. A new employer holds the 2.42% rate until it has been registered long enough to earn its own rating, then moves to an experience-based rate driven by its own claims history. The Massachusetts Department of Unemployment Assistance (DUA) administers registration and rating.

There is also a state assessment layered on top of the base UI rate, which is why the all-in effective rate runs higher than the headline figure. The federal layer sits above all of this: FUTA applies to the first slice of each employee's wages, less the full credit for compliant state payers, leaving an effective 0.6%. Source: Massachusetts DUA, UI contribution rates.

PFML is the layer out-of-state employers most often miss. At 25 or more covered individuals you owe an employer share of at least 0.42% on the medical-leave portion, while up to 0.28% of medical leave and the full 0.18% family-leave slice can be deducted from the employee, all capped at the Social Security wage base. Below 25 covered individuals there is no employer contribution, but you still withhold and remit the employee's 0.46%. Rates are set by the Massachusetts Department of Family and Medical Leave (DFML). The full leave entitlement picture, including job-protection rules, is in our Massachusetts paid family and sick leave guide.

Massachusetts also mandates earned sick time: staff accrue one hour for every 30 hours worked, up to 40 hours a year, and that time is paid for employers with 11 or more employees. The $15 minimum wage has held since 2023 with no 2026 increase, though legislators are debating future rises. Massachusetts wage, overtime, and meal-break law covers the full compensation floor. Federal DOL rules on FMLA run in parallel via the U.S. Department of Labor. Social Security Administration tables govern the FICA wage caps above. There is no local Massachusetts income tax to layer on.

Real HR and legal experts handle your Massachusetts hires and know the 5% withholding, the $1,107,750 surtax line, the $15,000 UI wage base, and the PFML split by heart. An actual person, not a chatbot or a pooled queue. You see every cost: the income-tax remittance, UI contributions, PFML, and federal employer taxes pass through at cost, itemised and auditable on every invoice. No setup fee, no exit fee.

Contractor onboarding, EOR payroll, and entity graduation all live on one platform: a Massachusetts contractor who converts to W-2 keeps their record, and that same employee can graduate to your own US entity without switching systems. Because Massachusetts carries real withholding plus PFML and a strict ABC worker-classification test, the compliance load per hire is heavier than a no-tax state, which often pushes the entity case later per headcount. Use the Crossover Calculator to see the month the model flips, or the Employer Cost Calculator to price the full stack before you extend an offer. EOR is the right model for Massachusetts until it isn't. Check your Teamed specialist when you're ready to decide. See how the Massachusetts termination and at-will exceptions affect offboarding risk on the same platform.