When you think about saving for retirement through a job, most plans fall into one of two major categories. They differ in one fundamental way: who is responsible for the final outcome. Let's break down each type.

A defined benefit plan is like a promise from your employer. They guarantee you a specific, predictable monthly income when you retire. This is why they're often called traditional pension plans.

The amount you receive is typically calculated using a formula. This formula usually considers factors like your salary, how many years you worked for the company, and your age at retirement. For example, a formula might be 1.5% of your average final salary for each year of service.

With this type of plan, the employer is in the driver's seat. They are responsible for contributing enough money to a pension fund and managing the investments. If the investments do poorly, the company has to make up the difference to ensure they can meet their promise to you. The risk is all on them. Your only job is to work long enough to become vested and eligible for the benefit.

These plans were once very common, but they have become much rarer in the private sector. They are still frequently offered to government employees, like teachers and public safety officers.

The more common type of plan today is the defined contribution plan. You've probably heard of its most popular versions, the 401(k) or the 403(b) for non-profit employees.

In this setup, the focus isn't on a promised future payout. Instead, the focus is on the contributions going into the account. The "defined" part is the contribution, not the benefit. You, and often your employer, contribute a specific amount or percentage of your salary to an investment account in your name.

Unlike a pension, you are in control. You decide how much to contribute from each paycheck (up to legal limits), and you choose how to invest that money from a menu of options your employer provides. This puts the investment risk squarely on your shoulders. The amount of money you have at retirement depends entirely on how much you and your employer contributed and how well your investments performed over time.

Your employer’s main roles are to administer the plan, provide the investment options, and sometimes, to help you save by matching a portion of your contributions. An employer match is a powerful incentive. For instance, an employer might match 100% of your contributions up to 4% of your salary. It's essentially free money that can significantly boost your savings.

Now, let's test your knowledge on these two fundamental plan types.

Understanding the difference between these two approaches is the first step in mastering your retirement strategy. It helps you know what to expect from your employer and what responsibilities fall on you.