This Maryland bonus tax calculator uses supplemental tax rates to calculate withholding on special wage payments such as bonuses. If you choose the option in Step 2(b) on Form W-4, complete this worksheet (which calculates the total extra tax for all jobs) on only.Learn how to run a bonus payroll and accurately calculate bonus pay and taxes with our comprehensive small business guide. Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. These could include bonuses, commissions, and tips, for example. Use a separate line for each type of compensation. Bonuses Available for All Eligible Programs. As an employer, you must record sums that are withheld from employee wages in a ledger account to clearly indicate the amount of state tax withheld. Learn the ins and outs of running payroll in Maryland, from payroll taxes and forms to labor laws, in this simplified guide. The 2024 bonus tax withholding rate is 22 percent.