For most workers, the tax deducted from a paycheck in Massachusetts runs somewhere between 25% and 35% of gross pay. That total is built from four separate withholdings: federal income tax, the 6.2% Social Security tax, the 1.45% Medicare tax, and Massachusetts’s flat 5% state income tax. A small Paid Family and Medical Leave contribution comes out on top of those. Where you land inside that range depends on your income, your filing status, and whether you steer any pay into pre-tax benefits like a 401(k) or health insurance premium.
Social Security and Medicare
The easiest deductions to predict are Social Security and Medicare, together called FICA. Both are flat rates. Neither changes with your filing status or dependents.
Social Security tax is 6.2% of wages up to $184,500 in 2026.1Social Security Administration. Contribution and Benefit Base Once your year-to-date earnings cross that line, the 6.2% withholding stops for the rest of the calendar year, capping your annual Social Security tax at $11,439. High earners paid monthly often notice their October or November check getting visibly larger for exactly this reason.
Medicare tax is 1.45% of all wages with no cap.1Social Security Administration. Contribution and Benefit Base If your annual wages exceed $200,000, an Additional Medicare Tax of 0.9% applies to every dollar above that threshold, and your employer does not match it.2Social Security Administration. 2025 Social Security Changes Combined, most workers pay 7.65% in FICA on every paycheck until they hit the Social Security cap.
Federal Income Tax
Federal income tax is the most variable line on your pay stub. Your employer calculates it from IRS Form W-4, using the filing status, dependent claims, and any extra withholding you requested.3Internal Revenue Service. Topic No. 753 Form W-4 Employees Withholding Certificate If you never turn one in, your employer withholds as if you were single with no adjustments, which usually pulls more than necessary.
The federal system is progressive. Income moves through brackets, each taxed at a higher rate than the last. The 2026 brackets for a single filer are:4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
- 10% on the first $12,400 of taxable income
- 12% from $12,401 to $50,400
- 22% from $50,401 to $105,700
- 24% from $105,701 to $256,225
- 32% from $256,226 to $401,775
- 35% from $401,776 to $640,600
- 37% above $640,600
These brackets apply to taxable income after the standard deduction, not to your gross wages. Someone earning $70,000 in gross wages isn’t paying 22% on the full amount. The withholding tables build all of this in automatically. Married-filing-jointly brackets are wider, so a married filer typically has less federal tax withheld per paycheck than a single filer at the same salary.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
The Massachusetts 5% Flat Tax
Massachusetts skips the bracket math for ordinary wages and applies a flat 5% tax to most earned income.5Mass.gov. Massachusetts Tax Rates Your employer calculates the withholding from Form M-4, the state version of the W-4.6Massachusetts Department of Revenue. Form M-4 Massachusetts Employees Withholding Exemption Certificate Without an M-4, withholding runs at the full 5% with no exemptions.
On the M-4 you claim personal exemptions that shrink the income subject to that 5%. A single filer gets a $4,400 personal exemption, and additional exemptions are available if you’re 65 or older or legally blind.7Mass.gov. Massachusetts Personal Income Tax Exemptions Those exemptions lower the base your employer withholds against.
Massachusetts has no local or municipal income tax. Nothing from your city or town will appear on your pay stub.
The 4% Surtax on High Earners
A 4% surtax applies to the portion of annual taxable income above an inflation-adjusted threshold, producing a top state rate of 9% on income above the line. For tax year 2025, the threshold is $1,083,150, and it adjusts upward each year for inflation.5Mass.gov. Massachusetts Tax Rates Only the income above the threshold sees the extra 4%.
Paid Family and Medical Leave
Every Massachusetts paycheck also carries a Paid Family and Medical Leave deduction. The total 2026 contribution rate is 0.88% of eligible wages, split between employer and employee.8Mass.gov. Paid Family and Medical Leave Employer Contribution Rates and Calculator
Your share is 0.46% of eligible wages: 0.18% for family leave and 0.28% for medical leave. If your employer has 25 or more covered workers, they pick up the remaining 0.42%. If your employer has fewer than 25 covered workers, you still pay the full 0.46% but the employer isn’t required to contribute on top of that. PFML contributions cap out at the Social Security wage base of $184,500.8Mass.gov. Paid Family and Medical Leave Employer Contribution Rates and Calculator On a $60,000 salary, the employee share works out to roughly $276 per year, or about $5.31 a week.
Deductions You Won’t See in Massachusetts
Two payroll taxes common in other states don’t appear on Massachusetts pay stubs. State unemployment insurance is funded entirely by employers, so no unemployment line shows up on your check. Massachusetts also has no separate state disability insurance program deducted from wages, unlike New York, New Jersey, or California.
How Pre-Tax Benefits Reduce the Bite
Pre-tax deductions are the biggest lever you have to shrink withholding. Contributions to employer-sponsored health insurance, a traditional 401(k), or a Health Savings Account come out of gross pay before federal and state income taxes are calculated. That lowers the base for both the 5% state tax and your federal marginal rate.
One catch. Pre-tax retirement and health contributions generally do not reduce wages for Social Security and Medicare purposes. You still pay the full 7.65% FICA on those dollars, and PFML applies to your full eligible wages.
Post-tax deductions work the other way. Roth 401(k) contributions, union dues, and court-ordered garnishments come out after taxes are calculated, so they cut your take-home without cutting your tax bill. The tradeoff for Roth is that qualified withdrawals in retirement come out tax-free.
How Pay Frequency Changes Each Check
Pay frequency changes the size of each deduction but not your annual total. Weekly pay produces 52 smaller withholdings. Biweekly produces 26 moderate ones. Monthly produces 12 larger ones. The yearly math is identical.
The one place frequency becomes visible is the Social Security cap. A high earner paid monthly might stop seeing 6.2% withheld in October or November and get noticeably larger checks after that. Someone paid weekly hits the same cap, but the effect per check is smaller and spread across more pay periods.
Two Jobs or Side Income Can Trigger a Shortfall
If your withholding falls too far short of your actual tax bill, both the IRS and the Massachusetts Department of Revenue can charge interest. Federally, you can avoid the underpayment penalty if you owe less than $1,000 at filing, or if your withholding and estimated payments covered at least 90% of the current year’s tax or 100% of last year’s. That safe harbor rises to 110% of last year’s tax if your prior-year adjusted gross income exceeded $150,000.9Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
Massachusetts charges interest on underpayments at the federal short-term rate plus four points. For early 2026, that rate sits between 7% and 8%.10Mass.gov. TIR 26-2 Interest Rate on Overpayments and Underpayments The most common trigger is holding two jobs without adjusting the W-4 and M-4 at each employer, since each one withholds as if its wages are your only income. Freelance income on the side can produce the same shortfall. In either case, requesting extra withholding on your W-4 (Step 4c) and M-4 is the simplest fix.