Your Bonus and Paycheck are two separate pay entities. Your Bonus is contingent on your employer and 401K institution's agreement or plan. Usually, if allowed by your plan, you can elect to have a portion of your Bonus contributed to your 401k plan.
Typically, if your employer allows you to contribute bonuses into 401(k), the 401(k) plan may be set to deduct a percentage from your bonus at the same rate as your paycheck. It is what is normal for your employer and any elections you make.
You can get this information from your plan advisor or Human Resources.
Please come back to the forum if you have additional information or need further assistance.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"