Legal Definition of Bonus: A commission; money paid by an employer to an employee as a reward for good performance; an extra dividend; money paid by a mortgagor to a mortgagee for prepayment of a mortgage debt | Discover the legal definition of bonuses and their importance for both employers and employees in this informative article. From performance-based incentives to mortgage prepayment bonuses, learn how to comply with employment laws, motivate and retain your employees, and plan for financial success. Click to read more