A compensation arrangement, typically documented and utilized by employers in addition to wages, which may include benefits such as life insurance, medical insurance, and qualified retirement plans. These plans can be either defined benefit plans, promising specified benefits based on age, years of service, and compensation, or defined contribution plans, where benefits are based on contributions to individual accounts by both employer and employee, as well as investment returns. Common plans include profit-sharing, employee stock ownership plans, and 401(k) plans, often receiving favorable tax treatment.