A defined benefit plan is a type of employer-sponsored retirement plan that provides employees with a guaranteed monthly benefit at retirement. The benefit amount is typically based on factors such as salary history and years of service.

Eligibility for a defined benefit plan depends on the employer’s specific plan rules. Generally, employees must meet certain age and service requirements, such as working for the company for a specified number of years.

A defined benefit plan guarantees a specific monthly benefit at retirement, while a 401(k) is a defined contribution plan where the benefit depends on contributions and investment performance. Employers bear the investment risk in defined benefit plans, whereas employees bear it in 401(k) plans.

Defined benefit plans are less common today but are still offered by some employers, especially in the public sector and certain large private companies. Many employers have transitioned to defined contribution plans, such as 401(k)s, due to cost considerations.