The percentage method The withholding rate for supplemental wages is 22 percent. That rate will be applied to any supplemental wages like bonuses up to $1 million during the tax year. If your bonus totals more than $1 million, the withholding rate for any amount above $1 million increases to 37 percent.
Massachusetts Court Finds Retention Bonuses Are Not Wages. A Massachusetts state appellate court recently ruled a retention bonus is a form of “contingent compensation” not subject to Massachusetts's wage laws.
The federal bonus tax withholding rate is typically 22%. However, employers could instead combine a bonus with your regular wages as though it's one of your usual paychecks—with your usual tax amount withheld. There are ways to reduce the tax impact of your bonus.
Income items included in both Massachusetts and federal taxable income but with differences: Capital Gains Massachusetts taxes most long-term gains at 5% and taxes long-term gains from the sale or exchange of collectibles at 12% (subject to a 50% deduction).