Learn how to run a bonus payroll and accurately calculate bonus pay and taxes with our comprehensive small business guide. Contains 3 example incentive plans.This fact sheet provides general information regarding bonuses and the regular rate of pay under the FLSA for non-exempt employees. Use our bonus tax calculator to estimate your taxes so you know what to expect. The following chart compares how a 25 percent retention incentive is calculated and paid using a sample of payment options available under the regulations. PAYROLL your business: If you have employees, this guide can help you understand pay requirements and your payroll tax responsibilities. This Washington bonus tax calculator uses supplemental tax rates to calculate withholding on special wage payments such as bonuses. Handbook in the sections labeled for Contractor use in the template. Sign-on Bonuses: Provided to new hires to attract top talent, especially for roles that are critical or hard to fill. This Washington bonus tax calculator uses supplemental tax rates to calculate withholding on special wage payments such as bonuses.