When you think about retirement, you probably picture savings accounts like a 401(k), where you put money away from each paycheck. But for a long time, many workers relied on a different kind of financial tool, one that acted like a personal promise from their employer. This tool is the pension plan. Imagine working for a company for 30 years and then receiving a steady, predictable paycheck every month for the rest of your life, without having to worry about stock market swings. That’s the magic of a traditional pension. While they are less common today, understanding what pension plans are and how they work is still incredibly important, as they represent a gold standard of retirement security that has shaped how we think about our post-work years.

What Exactly is a Pension Plan?

A pension plan is a type of retirement plan where an employer makes contributions to a pool of funds set aside for a worker's future benefit. The funds in the pool are invested on the employee's behalf, and the earnings on the investments generate income for the worker upon retirement. In its most classic form, a pension provides a guaranteed, fixed monthly income for life once you retire. It is a promise from your employer to provide you with a specific, predictable stream of cash to live on, based on factors like your salary and how long you worked for the company. This makes it fundamentally different from a 401(k), where you are responsible for saving the money and the amount you have in retirement depends entirely on how much you contributed and how your investments performed.

Defined Benefit vs. Defined Contribution

Pension plans come in two main flavors: defined benefit and defined contribution. The traditional pension plan described above is a "defined benefit" plan. The key here is that your ultimate payout is defined and guaranteed. Your employer is responsible for funding the plan and managing the investments to ensure there is enough money to pay you your promised benefit. The financial risk is on the company.

The other type is a "defined contribution" plan. The most common example of this is the 401(k). In this case, the amount of money going into the plan is defined—for example, you contribute 5% of your pay and your employer contributes 3%. However, the final amount you have at retirement is not guaranteed. It depends entirely on how well the investments in your account perform. With a defined contribution plan, the financial risk is entirely on you, the employee.

How Pension Benefits Are Calculated

For a traditional defined benefit pension, your future income is not a random number. It is calculated using a specific formula that usually takes three key factors into account. The first is your years of service with the company. The longer you work, the larger your pension will be. The second factor is your salary. The formula might use your average salary over your entire career or, more commonly, your average salary during your final few years of employment, when your earnings are typically highest. The third element is a percentage multiplier, sometimes called a "pension factor," which is set by the company. For example, the formula might be: 1.5% times years of service times final average salary. This formula produces the specific annual pension income you are entitled to.

Who Still Offers Pension Plans?

If pensions sound like a great deal, you might be wondering why they are not more common. Over the past few decades, there has been a major shift away from defined benefit pensions, especially in the private sector. Companies found them to be expensive and financially risky to maintain. As a result, most private companies have frozen or closed their pension plans to new employees, offering 401(k) plans instead. However, pension plans are still a major feature in the public sector. They remain common for government employees at the federal, state, and local levels. This includes teachers, police officers, firefighters, and other civil service workers. Some unions also continue to offer pension plans to their members.

The Disappearing Act of the Pension

The primary reason pensions have become rarer is the risk and cost to employers. With a defined benefit plan, the company is on the hook to pay out benefits for decades, regardless of how the stock market performs. A major market downturn could leave the pension fund short of money, forcing the company to make huge contributions to make up the difference. This financial uncertainty made defined contribution plans like the 401(k) much more attractive to businesses. By shifting to a 401(k), companies could define their contribution, often as a match, and transfer the long-term investment risk from their balance sheet to the employee. This provided businesses with more predictable costs and less financial liability.