What Is a 401(k) Plan and How Does It Work?
A 401(k) plan is a retirement savings account that many employers offer to their employees. The name comes from a section of the tax code that created this type of plan in 1978. Unlike a regular savings account, a 401(k) has special tax advantages that make saving for retirement easier.
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Here's how the basic process works: You decide to set aside a portion of your paycheck to put into your 401(k). This money comes out before taxes are calculated on your regular income, which lowers the amount of income tax you owe that year. For example, if you earn $50,000 and contribute $5,000 to your 401(k), you only pay income tax on $45,000. The money sits in your 401(k) account and grows over time through investments.
Many employers offer what's called a "match." This means if you contribute a certain percentage of your salary, your employer will add money to your account too. A common match is when an employer contributes 50 cents for every dollar you contribute, up to 6% of your salary. So if you earn $50,000 and contribute $3,000 (6%), your employer might add another $1,500. That's free money added to your retirement savings.
The money in your 401(k) is invested in funds you select—typically stocks, bonds, and other investments. These investments grow over time. When you reach age 59½, you can start taking money out without a penalty. If you leave your job before retirement, you have options for what to do with your 401(k), which we'll discuss later.
The basic idea is simple: you save money during your working years through automatic paycheck deductions, your employer may contribute additional money, and your money grows through investments. Then, during retirement, you use that money to live on.
Practical takeaway: Think of your 401(k) as a partnership between you and your employer to build retirement savings. You contribute money from your paycheck, your employer may add matching funds, and the combination grows through investments over decades.
Understanding Contribution Limits and How Much You Can Save
The government sets annual limits on how much money you can contribute to your 401(k) each year. These limits change periodically to account for inflation. For 2024, the contribution limit is $23,500 for people under age 50. If you're 50 or older, you can contribute an additional $7,500, for a total of $31,000. These numbers increase slightly each year in increments of $500 when inflation reaches a certain threshold.
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These limits apply to your contributions only—not your employer's matching contribution. So if you contribute $23,500 and your employer matches half of 6%, your employer might add several thousand dollars more. Your employer's contribution doesn't count against your personal limit.
To reach these contribution limits, your paycheck contribution is typically spread across the entire year. If you wanted to contribute the full $23,500 in 2024, you'd need to contribute about $1,958 per paycheck if you're paid twice monthly (26 paychecks). Many people contribute smaller amounts, such as 5% or 10% of their salary.
Your employer decides whether to offer a match and what that match looks like. Some common match formulas include: 100% match up to 3% of salary (you get a dollar-for-dollar match on the first 3% you contribute), or 50% match up to 6% of salary (you get 50 cents for every dollar you contribute up to 6%). If your employer offers a match, it's generally worth contributing at least enough to get the full match, since that's essentially a raise.
It's important to note that not everyone needs or wants to contribute the maximum. Many financial educators suggest starting with what fits your budget—often 3% to 5% of your salary—and increasing your contribution by 1% each year as you receive raises. This gradual approach makes saving feel manageable.
If you have multiple jobs or also contribute to other retirement plans, the limits become more complex. The $23,500 limit applies across all of your employers' 401(k) plans combined, not separately at each job. This is an important detail if you work more than one job.
Practical takeaway: Start by contributing enough to capture your full employer match if one is offered. After that, contribute what fits your budget, knowing you can increase contributions over time as your income grows.
Tax Advantages: Traditional 401(k) vs. Roth 401(k)
One of the biggest reasons people use 401(k) plans is the tax advantages. There are two main types of 401(k) accounts: Traditional and Roth. Understanding the difference helps you decide which one makes sense for your situation.
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With a Traditional 401(k), you contribute pretax money. This means the money comes out of your paycheck before income taxes are calculated. If you earn $50,000 and contribute $5,000 to a Traditional 401(k), you pay federal income tax only on $45,000. This reduces your tax bill immediately. However, when you withdraw money during retirement, you pay income tax on that withdrawal at whatever tax rate applies at that time.
A Roth 401(k) works differently. You contribute after-tax money, meaning you've already paid income taxes on it. There's no tax deduction in the year you contribute. However, the major advantage is that when you withdraw money in retirement—including all the investment growth—you pay no income tax on it. This can be valuable if you expect to be in a higher tax bracket during retirement, or if you think tax rates will be higher in the future.
Which type makes more sense depends on your personal situation. If you're in a high tax bracket now and expect to be in a lower bracket in retirement, a Traditional 401(k) makes sense. If you're early in your career with relatively low income now, a Roth 401(k) might be better because you'll pay lower taxes today and avoid taxes on decades of investment growth later.
Many employers offer both types, and some allow you to split your contributions between them. For example, you might put 70% of your contributions into a Traditional 401(k) and 30% into a Roth 401(k). This "split strategy" gives you flexibility in retirement when you can choose which account to withdraw from based on your tax situation that year.
There's an important limitation with Roth 401(k)s: unlike Roth IRAs, there's no income limit that prevents high earners from contributing. However, there are required minimum distribution rules that apply even to Roth 401(k)s (though not to Roth IRAs). The rules around these accounts are technical, so reading your plan documents or speaking with a financial professional can help clarify what applies to you.
Practical takeaway: Traditional 401(k)s save you taxes now, while Roth 401(k)s save you taxes in retirement. Consider your current and expected future income to determine which type aligns with your situation.
Investment Choices and Building Your Portfolio
When you open a 401(k), you don't just put your money in a single place. Instead, you choose from a menu of investment options provided by your plan. The investment choices vary by employer, but most plans offer similar types of investments: stock funds, bond funds, money market funds, and target-date funds.
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Stock funds invest in shares of companies. Historically, stocks have provided higher long-term returns but with more ups and downs in value year to year. For someone decades away from retirement, stock funds typically make up a larger portion of the portfolio. Bond funds invest in debt issued by governments and companies. Bonds are generally less volatile than stocks and provide steadier income, but typically lower long-term growth. Money market funds are the most conservative option, with very stable value but minimal growth potential.
Many 401(k) plans offer "target-date funds," which are popular for people who want a simple approach. A target-date fund automatically adjusts its mix of stocks and bonds based on when you plan to retire. For example, if you plan to retire around 2055, you'd choose a target-date 2055 fund. When you're young, the fund holds mostly stocks to maximize growth