Print the form, and then you and your employer must sign and date it. Then, fax it to your MCO.To implement a performance employee bonus plan in your organization, we recommend the following steps: Setting goals for bonus payout. Learn how to run a bonus payroll and accurately calculate bonus pay and taxes with our comprehensive small business guide. Many employers use commissions and bonuses as a way to underpay overtime. Choose Nilges Draher LLC to help make sense of your situation. What is a Bonus Plan? A bonus plan is an agreement between the employer and employee to pay out a predetermined amount of money based on performance. A W4 tells your employer how much tax to withhold from your paycheck when you start a new job, but you can adjust it any time. Use our bonus tax calculator to estimate your taxes so you know what to expect.