Massachusetts Payroll Taxes and Withholding Guide (2026)

What Makes Massachusetts Payroll Different

Federal payroll tax is the same in every state. What changes from one state to the next is the second layer: state income tax withholding, employer unemployment taxes, and any employee social-insurance contributions. Massachusetts is a flat-rate state, so its 5.0% is simpler than the graduated brackets of California or New York, but two features make the actual number less obvious than a plain 5% multiplication.

First, the Circular M withholding method does not apply 5% to your full wages. It first subtracts up to $2,000 of your Social Security and Medicare tax and then your Form M-4 exemption, so the state line always lands a little below 5% of gross. Second, a 2022 constitutional amendment added a 4% surtax on income above a high, inflation-indexed threshold. The federal baseline behind all of this is explained in the how payroll taxes work guide.

Employee Withholding Overview in Massachusetts

A Massachusetts employee sees federal taxes, the flat 5.0% state income tax, and one state premium line. The deductions fall into two groups: federal taxes and the Massachusetts lines.

The federal lines work identically to any other state. For Social Security, the 2026 wage base is $184,500, after which Social Security and the PFML contribution both stop for the year. Medicare has no cap. The Massachusetts lines are the flat 5.0% income tax computed through Circular M and the 0.46% PFML employee contribution.

The Flat 5.0% Income Tax and the Circular M Method

Massachusetts taxes most income, including wages, at a single flat rate of 5.0%. Unlike a graduated state, there are no brackets to climb; the same 5.0% applies to the first dollar and the last. What surprises people is that an employer does not simply multiply gross wages by 5%. It follows the Department of Revenue Circular M percentage method, which reduces the wage base first.

Working from a per-period paycheck, the employer subtracts the Social Security, Medicare, and Massachusetts, U.S., or Railroad Retirement contributions withheld, up to an annual maximum of $2,000, then subtracts the Form M-4 exemption, and multiplies the remainder by 5.0%. Head-of-household status and blindness reduce the result by small fixed credits. Because both the FICA deduction and the exemption come off before the 5% applies, the state line on a normal paycheck is always a little under 5% of gross. The Massachusetts paycheck calculator reproduces this method line by line.

Form M-4 Exemptions and the $2,000 FICA Deduction

Massachusetts uses its own Form M-4, the Employee's Withholding Exemption Certificate, alongside the federal W-4. The federal Tax Cuts and Jobs Act zeroed out personal exemptions on the W-4 in 2020, but it did not change Massachusetts law, so the M-4 still drives Massachusetts withholding through a number of exemptions.

The Exemption Amount and the Zero-Exemption Cliff

On an annual basis, the Massachusetts exemption is $3,400 plus $1,000 for each exemption claimed, but only if you claim at least one. Claim zero exemptions and the exemption amount is $0. That is a genuine cliff: a single filer who claims one exemption subtracts $4,400 before the 5% applies, saving 5.0% × $4,400 = $220 of Massachusetts tax for the year, while a filer who leaves the M-4 blank subtracts nothing. Claim the exemptions you are legitimately entitled to; you reconcile everything on the annual Form 1.

The Up-to-$2,000 FICA Deduction

Massachusetts also lets you deduct the Social Security, Medicare, and government retirement contributions withheld from your pay, up to an annual maximum of $2,000, before the 5% applies. Because 7.65% of FICA reaches $2,000 at roughly $26,150 of wages, nearly every full-time worker deducts the full $2,000, which lowers Massachusetts tax by about $100 for the year. It is a real Massachusetts feature that a generic flat-5% estimate misses entirely.

The Massachusetts 4% Millionaire Surtax

In November 2022, Massachusetts voters approved a constitutional amendment adding a 4% surtax on high incomes, often called the Fair Share Amendment or millionaire's tax. It applies to the portion of annual taxable income above a threshold that the Department of Revenue indexes for inflation each year.

The threshold is $1,107,750 for 2026, up from $1,083,150 in 2025 and $1,000,000 when the surtax first took effect in 2023. On income above the threshold, the surtax stacks on top of the 5.0% base rate, so that slice is taxed at a combined 9%. Importantly, the surtax is generally settled on the annual Form 1 return rather than through routine paycheck withholding, and it counts all taxable income, including capital gains and business income, not just wages. High earners with a large equity event or business sale often arrange additional withholding or estimated payments so the surtax does not become an April surprise.

Massachusetts Paid Family & Medical Leave (PFML)

Massachusetts Paid Family & Medical Leave pays partial wages to workers who take leave for a serious health condition, a new child, or a family member's care. It is funded by a contribution shared between employers and employees, and the employee share is deducted from each paycheck.

2026 Contribution Rate and Split

For 2026 the total PFML contribution is 0.88% of gross wages, unchanged from 2025. The employee share is 0.46%, made up of 0.28% for medical leave plus the full 0.18% family-leave contribution. Employers with 25 or more covered individuals pay the remaining 0.42% medical-leave share; employers with fewer than 25 are not required to pay that employer portion, but employees still pay 0.46% in either case.

The Social Security Cap

The PFML contribution is collected on gross wages up to the Social Security cap, which is $184,500 for 2026. Once cumulative wages reach that cap, the contribution stops for the rest of the year, exactly as Social Security stops. That limits the 2026 employee PFML contribution to $848.70 for the year (up from $810.06 in 2025). The Massachusetts paycheck calculator applies the cap automatically.

Employer Payroll Obligations in Massachusetts

Massachusetts employers carry the federal employer taxes plus the state unemployment contribution and the employer share of PFML. The federal side, covered in the employer payroll tax obligations guide, includes the matching 6.2% Social Security and 1.45% Medicare plus Federal Unemployment Tax (FUTA). On top of that, Massachusetts adds a state unemployment tax paid entirely by the employer and the medical-leave share of PFML.

The Massachusetts unemployment tax is assessed on the first $15,000 of each employee's wages and depends on the employer's experience rating with the Department of Unemployment Assistance, plus the separate Employer Medical Assistance Contribution and any COVID-19 recovery assessment. None of this is deducted from employee pay. The combined cost-to-hire can be modeled with the employer payroll tax calculator.

Massachusetts Has No Local Wage Income Tax

No Massachusetts city or town withholds a local wage income tax from employees. A worker in Boston, Worcester, Springfield, Cambridge, Lowell, or anywhere else in Massachusetts pays only the state 5.0% income tax, with no city or county income tax line.

This is different from neighboring states and from Ohio or Pennsylvania, where municipalities levy their own wage taxes. In Massachusetts, the state income tax is the whole income-tax story on a pay stub, which keeps the deduction list short: federal taxes, the 5.0% state tax, and the PFML contribution.

How Take-Home Pay Works in Massachusetts

The calculation sequence runs from gross pay down to net pay, with one state income-tax line and one premium line to subtract.

1. Start with gross wages for the pay period.
2. Apply federal income tax withholding using the Form W-4 and IRS Publication 15-T.
3. Subtract Social Security (6.2%, up to $184,500) and Medicare (1.45%) on FICA wages.
4. Subtract Massachusetts income tax: 5.0% of wages after the up-to-$2,000 FICA deduction and the M-4 exemption, following Circular M.
5. Subtract the PFML employee contribution (0.46% for 2026, up to the $184,500 cap).
6. The remainder is net pay. There is no local income tax to subtract.

To see exact figures for a specific salary and pay frequency, use the Massachusetts paycheck calculator or the general take-home pay calculator for a full pre-tax benefits stack.

Massachusetts Supplemental Wage Withholding

Supplemental wages are payments outside regular salary: bonuses, commissions, overtime, sales awards, and back pay. Massachusetts applies its flat 5.0% rate to supplemental wages as well.

• Massachusetts withholds 5.0% on supplemental wages, the same flat rate as regular pay.
• The PFML contribution still applies to supplemental wages, at the same 0.46% employee rate, subject to the Social Security cap.
• Federal income tax withholding on supplemental wages is a separate calculation set by the IRS (usually 22% below $1 million), and Social Security and Medicare still apply under their own rules.

For the federal supplemental math on a bonus, use the Bonus Tax Calculator.

Massachusetts Reporting and Payment

Massachusetts employers file and pay withholding through MassTaxConnect. The filing frequency depends on how much tax is withheld: annually for $100 or less, quarterly for $101 to $1,200, and monthly for $1,201 to $25,000, with the largest withholders remitting more often. PFML contributions are reported and paid to the Department of Revenue quarterly through MassTaxConnect, and unemployment tax is paid to the Department of Unemployment Assistance on its own quarterly schedule. The federal deposit schedule is covered separately in the payroll tax deadlines guide.

New employees must be reported to the Massachusetts new hire directory shortly after the hire date.

Massachusetts Payroll Quick Facts (2026)

Frequently Asked Questions