Bonuses paid to Massachusetts employees are taxed as ordinary wages, but the withholding on the check is heavier than what comes out of a normal paycheck. Between federal income tax (usually a flat 22%), the Massachusetts 5% state rate, Social Security and Medicare, and the Paid Family and Medical Leave contribution, 30% to 40% of the gross bonus typically disappears before it reaches your bank account. That withholding is a prepayment, not the final tax. What you actually owe on the bonus gets sorted out when you file your return, and you may get some back or owe a bit more depending on where your total income lands.
Federal Withholding on the Bonus
The IRS treats bonuses as supplemental wages. Your employer picks one of two withholding methods, and the choice affects the size of the check.
The Flat 22% Method
Most employers use the percentage method. When the bonus is paid separately from your regular wages, they withhold a flat 22% for federal income tax, ignoring your W-4 and filing status.1Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide The 22% is a withholding rate, not a tax rate; it may be more or less than what you eventually owe.
That rate holds only on the first $1 million of supplemental wages in a calendar year. Every dollar above $1 million is withheld at 37%, the top federal marginal rate, no matter what your W-4 says.1Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
The Aggregate Method
The second option lumps the bonus in with your regular paycheck and runs the combined total through the standard withholding tables as if that were your normal pay for the period. This almost always takes a bigger bite than 22%, because the tables briefly treat you as if you earn far more per period than you do. If your biweekly pay is $3,000 and a $10,000 bonus lands in the same check, the tables read $13,000 as your normal biweekly income. It corrects itself at filing time, but the paycheck can be a shock.
Massachusetts State Withholding
Massachusetts does not have a separate flat withholding rate for bonuses. Employers calculate state withholding on supplemental wages using Circular M, the Department of Revenue’s withholding guide.2Massachusetts Department of Revenue. Massachusetts Circular M Income Tax Withholding Tables at 5.0% Effective January 1, 2026
The base rate on earned income, bonuses included, is a flat 5%. For most employees, the state simply takes 5% of the bonus after accounting for exemptions. Because the rate is flat rather than graduated, there’s no bracket-jumping effect on the state side.
The 4% Surtax on High Incomes
Massachusetts voters added a 4% surtax on taxable income above an annually adjusted threshold. For the 2026 tax year the threshold is $1,107,750. If your annualized wages plus bonus payments push over that line, the Circular M formula caps withholding at 9% (the 5% base plus the 4% surtax) on the portion above the threshold. Income below the threshold stays at 5%.2Massachusetts Department of Revenue. Massachusetts Circular M Income Tax Withholding Tables at 5.0% Effective January 1, 2026 For the vast majority of workers, the surtax never comes into play.
FICA and PFML on the Same Check
Social Security and Medicare taxes apply to every dollar of bonus pay, and no method election changes that.
- Social Security is 6.2%, up to the annual wage base of $184,500 for 2026. Once your year-to-date earnings hit that cap, no more Social Security tax is withheld for the rest of the year.3Social Security Administration. Contribution and Benefit Base
- Medicare is 1.45% on all earnings, with no cap.4Internal Revenue Service. Topic no. 751, Social Security and Medicare Withholding Rates
- An Additional Medicare Tax of 0.9% is withheld automatically once your wages pass $200,000 in the year, regardless of filing status.4Internal Revenue Service. Topic no. 751, Social Security and Medicare Withholding Rates
A late-year bonus can feel noticeably bigger than the same bonus paid in January, because Social Security withholding drops off once you cross the wage base.
Bonuses are also subject to Massachusetts Paid Family and Medical Leave. The total 2026 PFML contribution rate is 0.88% of eligible wages at employers with 25 or more covered workers, and up to 0.46% of that can be withheld from your paycheck (0.28% medical, 0.18% family). The employer pays the rest. At companies with fewer than 25 employees, the employer isn’t required to contribute to the medical or family leave portions; the 0.46% employee share is the only deduction.5Mass.gov. Paid Family and Medical Leave Employer Contribution Rates and Calculator PFML also stops at the $184,500 Social Security wage base for 2026.
Gift Cards, Trips, and Other Non-Cash Bonuses
A bonus doesn’t have to arrive as cash to be taxed. Gift cards, vacations, electronics, and similar rewards are taxable compensation at their fair market value, and your employer should add that value to your W-2 wages. A $2,000 vacation package for hitting a sales target is treated the same as a $2,000 cash bonus for withholding.
Narrow exceptions exist. Small, infrequent perks like a holiday ham or company-branded merchandise can qualify as de minimis fringe benefits and stay out of income. Cash and cash equivalents never qualify, no matter how small. A $25 gift card is fully taxable; a $25 box of chocolates is not. Tangible personal property given as a length-of-service or safety award can be excluded up to certain limits, but the exclusion never reaches cash, gift cards, vacations, event tickets, or securities.6Internal Revenue Service. Publication 15-B (2026), Employer’s Tax Guide to Fringe Benefits
Using a 401(k) to Cut the Tax on a Bonus
Whether your 401(k) deferral election applies to bonus pay depends on how your employer’s plan defines eligible compensation. Some plans include bonuses automatically, so your normal deferral percentage comes out of the bonus. Others exclude bonuses, and a few let you set a separate rate for supplemental payments. Ask HR before the check is issued if you want to change anything.
If your plan includes bonuses and you’re not close to the limit, a bonus is a useful way to accelerate retirement savings. The 2026 employee contribution limit is $24,500, with a $8,000 catch-up for workers 50 and older and a higher $11,250 catch-up for ages 60 through 63.7Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Traditional 401(k) contributions reduce current-year taxable income and directly lower what you owe on the bonus. Roth contributions don’t reduce this year’s taxes but grow tax-free.
What Happens When You File
Everything withheld from the bonus is a prepayment. On your return the bonus is just ordinary income stacked with your salary and everything else. There is no separate bonus tax at filing time.
If your employer withheld 22% federal but your actual marginal rate is higher, you owe the difference. The 2026 federal brackets for single filers are 10% up to $12,400, 12% up to $50,400, 22% up to $105,700, 24% up to $201,775, 32% up to $256,225, 35% up to $640,600, and 37% above that.8Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 A single filer earning $90,000 in salary plus a $10,000 bonus likely lands in the 22% bracket, so the 22% flat withholding was roughly right. Someone at $120,000 with the same bonus crosses into 24%, and part of the bonus is under-withheld.
The Massachusetts side reconciles the same way. Because the state rate is a flat 5% for most filers, state withholding usually comes out closer to even than federal.
Avoiding an Underpayment Penalty
A large bonus that pushes your income well above last year’s can create a gap between withholding and what you owe. If the gap is big enough, the IRS charges an underpayment penalty. You avoid the federal penalty if any of these are true: you owe less than $1,000 after withholding and credits, you paid at least 90% of the current year’s tax through withholding and estimated payments, or you paid at least 100% of last year’s tax liability. That last figure rises to 110% if your prior-year adjusted gross income was over $150,000.9Internal Revenue Service. Topic no. 306, Penalty for Underpayment of Estimated Tax
Massachusetts has its own underpayment penalty with a lower trigger. It applies when you owe more than $400 after withholding and credits. You can avoid it by making sure your withholding and estimated payments at least equal the tax on your prior-year return, spread across the four quarterly dates.
Withholding from wages carries an advantage estimated payments don’t: the IRS treats it as paid evenly across the year. A December bonus with heavy withholding can retroactively help cover earlier quarters where you might have been short. If you know a large bonus is coming and your regular withholding won’t cover the tax, submit a new W-4 to your employer and request additional withholding in Step 4 to close the gap.1Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide