Learn About Starting Your Workplace 401(k)

What a 401(k) Plan Is and How It Works

A 401(k) is a retirement savings plan that many employers offer to their workers. The name comes from a section of the Internal Revenue Code that created this type of plan. When you participate in a 401(k), money comes directly from your paycheck before taxes are taken out. This means the money you contribute reduces your current taxable income, which can lower the taxes you owe that year.

The basic mechanics work like this: you decide what percentage of your paycheck to set aside for retirement—for example, 3%, 5%, or 10%. That amount is taken from each paycheck and placed into an investment account that belongs to you. Your employer may add money to your account as well, through what is called a "match." For instance, an employer might match 50 cents for every dollar you contribute, up to 6% of your salary. If you earn $50,000 per year and contribute 6%, you put in $3,000. Your employer would then add $1,500 to your account.

The money in your 401(k) is invested in funds you select from a list provided by your plan. These funds typically include stock funds, bond funds, and money market funds. Your investments grow over time through compound growth—meaning your earnings generate their own earnings. A worker who starts contributing at age 25 and contributes $300 per month until age 65 could accumulate over $400,000, depending on investment returns and fees.

You cannot normally withdraw money from your 401(k) before age 59½ without paying taxes and a 10% penalty on the amount withdrawn. This rule encourages people to keep retirement savings in place until retirement. However, some plans allow loans or withdrawals for specific hardship situations.

Practical Takeaway: Understanding that a 401(k) is a tax-advantaged savings account where your contributions are deducted from your paycheck and invested for long-term growth helps you see how this tool works differently from a regular savings account.

Employer Matching and Why It Matters

One of the most valuable features of a 401(k) plan is the employer match. This is essentially free money that your employer adds to your retirement account based on how much you contribute. For many workers, not taking full advantage of the employer match means leaving significant amounts of money on the table.

Employer match programs vary widely. Some common structures include: a 100% match on the first 3% of salary you contribute (meaning if you contribute 3%, your employer adds 3%); a 50% match on the first 6% of your contributions (meaning if you contribute 6%, your employer adds 3%); or a flat 3% match regardless of how much you contribute. According to the Plan Sponsor Council of America, the average employer match is about 3% to 4% of an employee's salary.

Here is a concrete example of why this matters. Sarah earns $45,000 per year. Her employer offers a 100% match on the first 3% of her salary. If Sarah contributes 3% of her salary ($1,350), her employer will also contribute $1,350. That means Sarah gets an immediate 100% return on her contribution in the form of employer matching funds. If Sarah only contributed 1%, she would only receive a 1% match from her employer, missing out on $900 in free money each year. Over a 30-year career, that $900 yearly difference grows to over $35,000 (before accounting for investment growth).

To receive the full employer match, you typically must meet a vesting schedule. Vesting means you gradually own more of the employer contributions over time. A common vesting schedule requires you to work for the company for three to five years before you fully own all the employer match money. If you leave the company before you are fully vested, you may have to give back some or all of the employer contributions.

Practical Takeaway: Contributing enough to capture the full employer match is one of the most important retirement decisions you can make, as it is essentially receiving extra compensation for your work at no cost to you.

Understanding Contribution Limits and Tax Advantages

The government sets annual limits on how much money you can contribute to a 401(k). For 2024, the limit is $23,500 for workers under age 50. Workers age 50 and older can contribute an additional $7,500, for a total of $31,000. These limits change periodically to keep pace with inflation. These limits apply to your own contributions only; employer matches do not count toward your personal contribution limit.

The primary tax advantage of a 401(k) is the upfront tax savings. Money you put into a traditional 401(k) is not counted as income for the current year, reducing your taxable income. If you contribute $6,000 to your 401(k) and earn $50,000, you only pay income tax on $44,000. For someone in the 22% tax bracket, this saves about $1,320 in federal taxes. Over 10 years of $6,000 annual contributions, the tax savings alone would total approximately $13,200.

This tax deferral works because you do not pay taxes on the money until you withdraw it in retirement. At that point, many people are in a lower tax bracket because they no longer have employment income. However, withdrawals from a traditional 401(k) in retirement are taxed as ordinary income at whatever your tax rate is at that time.

Some employers also offer a Roth 401(k) option. With a Roth 401(k), you contribute money that has already been taxed (you do not get the upfront tax deduction), but withdrawals in retirement are tax-free. This can be valuable if you expect to be in a higher tax bracket in retirement or if you believe tax rates will increase in the future. Roth contributions count toward the same $23,500 annual limit as traditional contributions.

Beyond income tax savings, money in a 401(k) grows without being taxed each year. This allows compound growth to work more effectively. In a regular taxable investment account, you would owe taxes on dividends and gains each year, which reduces the amount available to reinvest.

Practical Takeaway: Knowing the annual contribution limits and tax advantages helps you make informed decisions about how much to contribute and whether a traditional or Roth approach fits your financial situation.

Investment Choices and Fund Selection

When you enroll in a 401(k), you must decide how to invest the money. Your plan provides a list of investment funds, typically ranging from 10 to 40 options. These funds fall into several categories: stock funds (which invest in company shares), bond funds (which invest in loans to companies and governments), money market funds (which are very stable but offer lower returns), and target-date funds (which automatically adjust their mix based on your expected retirement year).

Stock funds carry more risk but historically have offered higher returns over long periods. Someone with 30 years until retirement can typically afford to take more risk because they have time to recover from market downturns. Bond funds are less risky and provide steadier returns, making them appropriate for someone nearing retirement. A common starting approach for younger workers is the "target-date fund" offered by most plans. A target-date fund labeled "2055" or "2060" automatically adjusts from mostly stocks when you are young to more bonds as you approach retirement. This removes the need to actively rebalance your portfolio.

Consider a specific example. Maria is 35 years old and expects to retire at 65. She selects a target-date fund for 2060. When she enrolls, the fund holds about 85% stocks and 15% bonds. Each year, the fund automatically shifts to be slightly more conservative. By the time Maria is 55, the same fund might hold 60% stocks and 40% bonds. When she reaches 65, it might hold 40% stocks and 60% bonds. This automatic adjustment means Maria does not have to make active decisions about rebalancing.

Most plans charge fees for investment management, typically ranging from 0.2% to 1% of your account balance per year. A fee of 0.5% on a $100,000 account costs $500 per year. Over 20 years, a difference of 0.5% in fees can reduce your retirement balance by tens