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What You'll Learn About 401(k) Plans in This Guide

A 401(k) plan is a retirement savings account that many employers offer to their workers. The name comes from a section of the tax code that created this type of plan. This guide provides information about how 401(k) plans work, what they are designed to do, and how workers can learn more about whether their employer offers one.

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According to the U.S. Bureau of Labor Statistics, approximately 56% of private-sector workers have access to some form of retirement plan through their employer. For many of these workers, a 401(k) is the primary retirement savings vehicle available to them. Understanding how these plans function can help you make informed decisions about your financial future.

The guide covers several key topics that will help you understand the basics of 401(k) plans. You'll learn about how contributions work, what happens to your money when you contribute it, and how employers may match your contributions. The guide also explains the difference between traditional 401(k) plans and Roth 401(k) plans, which have different tax treatments.

One important distinction to understand is that this guide provides information only. It does not determine whether your employer offers a 401(k), whether you can participate in one, or what your specific retirement situation might look like. Those determinations depend on your individual circumstances and your employer's specific plan rules.

Practical Takeaway: Before reading further, gather information about your current employment situation. Do you know whether your employer offers a 401(k) plan? If you're unsure, your human resources or benefits department can tell you what retirement plans are available to you.

Understanding How 401(k) Contributions Work

When you participate in a 401(k) plan, you direct your employer to set aside a portion of your paycheck before taxes are calculated. This money goes directly into your 401(k) account. You decide what percentage of your paycheck you want to contribute, typically ranging from 1% to over 50% of your salary, though the IRS sets annual contribution limits.

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For 2024, the IRS allows workers under age 50 to contribute up to $23,500 per year to a 401(k) plan. Workers age 50 and older can contribute an additional $7,500, for a total of $31,000 per year. These limits exist to ensure the tax benefits of retirement plans remain available across a broad range of income levels. These limits change periodically, so it's worth checking current rules if you plan to make large contributions.

The money you contribute comes out of your gross income, which means you typically pay less in federal income taxes that year. For example, if you earn $60,000 and contribute $6,000 to your 401(k), your taxable income is reduced to $54,000 for tax purposes. This tax reduction is one major reason people use 401(k) plans for retirement savings.

Your contributions are invested according to your choices. Most 401(k) plans offer several investment options, such as mutual funds focused on stocks, bonds, or a mix of both. Some plans offer target-date funds, which automatically shift from riskier to safer investments as you approach retirement. The performance of these investments affects how much money you'll have in your account over time.

Practical Takeaway: If your employer offers a 401(k), review the investment options available in the plan. Many employers offer educational materials or one-on-one meetings with benefits advisors who can explain the different choices. Starting with a conservative investment mix and gradually adjusting it over time is a common approach.

How Employer Matching and Vesting Work

Many employers offer to match a portion of the contributions you make to your 401(k). This is essentially free money added to your retirement account. Employer matching programs vary widely. A common structure is that an employer will match 50% of the first 6% you contribute, meaning if you contribute 6% of your salary, your employer adds an additional 3% to your account.

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According to data from the Plan Sponsor Council of America, approximately 73% of employers that offer 401(k) plans provide some form of employer match. The average match is about 3.5% of an employee's salary. Some employers offer more generous matches, while others offer less. A few employers do not offer matching at all but may make contributions through other means.

Vesting is an important concept related to employer contributions. Vesting refers to the time period after which employer contributions become fully yours to keep. Your own contributions are always 100% yours from the moment they're made. However, employer matching money may be subject to a vesting schedule. An employer might use immediate vesting, meaning you own the matching contributions right away, or a gradual vesting schedule where you own an increasing percentage each year you remain employed.

For example, under a three-year vesting schedule, you might own 33% of your employer's matching contributions after one year, 67% after two years, and 100% after three years. If you leave the company before the vesting period ends, you keep only the portion that has vested. Your own contributions are not affected by vesting. Understanding your plan's vesting schedule helps you know what retirement assets will belong to you if you change jobs.

Practical Takeaway: Request a copy of your 401(k) plan's vesting schedule from your benefits department. Calculate what percentage of employer contributions you currently own. If you're considering changing jobs, understanding your vesting status can help you make a more informed decision about when to leave.

Differences Between Traditional and Roth 401(k) Plans

Most 401(k) plans are traditional 401(k) plans, but many employers now also offer Roth 401(k) options. The main difference between them involves when you pay taxes on your retirement savings. Understanding this difference is one of the most important parts of learning about 401(k) plans.

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In a traditional 401(k), you contribute pre-tax dollars. This means your contributions reduce your taxable income in the year you make them, lowering your federal income tax bill. When you withdraw money in retirement, those withdrawals are taxed as regular income at whatever your tax rate is at that time. The IRS requires you to start taking withdrawals at age 73 (as of 2023, following the SECURE 2.0 Act).

In a Roth 401(k), you contribute after-tax dollars. This means you pay federal income taxes on the money before it goes into the account, so your contributions do not reduce your current-year taxes. The major advantage is that when you withdraw money in retirement, both your contributions and the earnings on them are tax-free. Additionally, Roth 401(k) plans do not require mandatory withdrawals during your lifetime, giving you more flexibility in managing your retirement income.

Which type is better depends on your individual situation. If you expect to be in a lower tax bracket in retirement, a traditional 401(k) may be more beneficial because you get a tax deduction now and pay taxes at a lower rate later. If you expect to be in a higher tax bracket in retirement, a Roth 401(k) may be better because you pay taxes at your current rate and avoid taxes entirely in retirement. Many workers use a combination of both traditional and Roth contributions to balance these considerations.

Practical Takeaway: Review your employer's 401(k) plan documentation to see if both traditional and Roth options are available. Consider speaking with a tax professional or financial advisor who can review your personal situation and discuss which option might align with your circumstances and expectations about your future tax situation.

What Happens to Your Money Over Time

Once your money is in a 401(k) account, it's invested in the funds you selected. Over time, your account balance grows in three ways: through your own contributions, through employer matching contributions, and through investment returns. The growth of your account balance through investment returns depends on market performance and cannot be predicted with certainty.

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Consider an example: Maria earns $55,000 per year and contributes 6% of her salary to her traditional 401(k), which equals $3,300 per year. Her employer matches 3% of her salary, which equals $1,650 per year. So each year, $4,950 goes into her 401(k) account. If these contributions were