Massachusetts Bonus Tax Calculator

For a bonus paid separately from your regular check, employers normally withhold a flat 22.0% for federal income tax, a flat 5% for Massachusetts, plus 6.2% Social Security and 1.45% Medicare, and pfml contribution (0.46%). That is 35.1% in total, so a $5,000 Massachusetts bonus arrives as about $3,245. Both flat rates are withholding, not the final tax; the bonus is ordinary income on your federal and Massachusetts returns and any over-withholding comes back as a refund.

No. A bonus is ordinary income taxed at the same federal and Massachusetts rates as your salary. The reason a bonus feels heavily taxed is the withholding method: the federal 22% and Massachusetts 5% flat rates are higher than the effective rates most people pay on regular wages, and the alternative (the aggregate method, where the bonus is lumped in with a regular check) makes payroll treat you as if you earned that much every period. Either way, over-withholding comes back when you file.

If a bonus is paid in the same check as regular wages and not identified separately, the employer combines them and withholds on the total using your W-4 and Massachusetts withholding form as if it were one large regular paycheck. That usually takes more out than the flat method for a big bonus. Employers can use the flat-rate method only when they identify the bonus separately and have withheld income tax from your regular wages during the year.

Yes. The IRS and Massachusetts treat commissions, severance, back pay, signing and retention bonuses, awards and prizes, accumulated sick leave payouts and non-qualified moving reimbursements as supplemental wages, so the same flat-rate or aggregate rules apply. Tips are not supplemental wages; they're withheld on through your regular W-4 calculation.

Social Security stops at the 2026 wage base of $184,500. If your year-to-date wages are already past it, the 6.2% line on a bonus is zero; if the bonus straddles the cap, only the part below it is taxed. Medicare never stops, and once wages pass $200,000 for the year an extra 0.9% is withheld on everything above, including bonuses. Massachusetts income tax and pfml contribution apply to the whole bonus. Enter your year-to-date wages in the calculator to see the effects.

You can't change the flat withholding rates on a separately paid bonus, but you can lower what's taxable. Ask payroll to direct part of the bonus into your traditional 401(k) (up to the annual limit) or an HSA; both come off federal and Massachusetts taxable wages, though not pfml contribution wages. If the withholding leaves you over-paid for the year, file a new W-4 with less extra withholding for the remaining paychecks.