A bonus after tax calculator is a valuable tool for many employees to use to figure out how much of their bonus will be theirs. It can be used to work out tax bonus deductions as per withholding guidelines. Knowing what the tax levy is on bonuses makes it simpler to arrange one's finances. Many wonder what the bonus tax percentage is before taking an incentive payment. If you're wondering how much is taxes on a bonus, the answer depends on your income, payroll method, and tax regulations.