This North Carolina bonus tax calculator uses supplemental tax rates to calculate withholding on special wage payments such as bonuses. Learn about 9 of the best employee bonus structures with ShareWillow's comprehensive guide.A signon bonus is a discretionary bonus that serves as a recruitment incentive. Learn how to run a bonus payroll and accurately calculate bonus pay and taxes with our comprehensive small business guide. Download a professionally designed Payroll calculator to help you run your payroll in Excel and track your employee payments and hours. What is the percentage method for bonuses? The percentage method is used if your bonus comes in a separate check from your regular paycheck. Do not modify this template or any cells or formulas! Sign-on Bonuses: Provided to new hires to attract top talent, especially for roles that are critical or hard to fill. Basic allocation, there may be some bonus USDA foods available for distribution which is allocated in the same manner as the entitlement USDA foods.