Key takeaways
  • A 401(k) is an employer-sponsored retirement savings option that allows you to contribute money from your paycheck into an investment account.

  • Contributions to a traditional 401(k) are made pre-tax, which can lower your taxable income. Contributions to a Roth 401(k) are made with after-tax dollars, allowing for tax-free withdrawals in retirement.

  • Many employers offer matching contributions up to a certain percentage of your salary, which can provide a significant savings boost.

A 401(k) is a type of employer-sponsored retirement savings plan that offers significant tax advantages. When you participate in a 401(k), you decide how much of each paycheck to contribute, and your employer automatically deducts this amount and invests it according to your choices. Many employers also match a percentage of your contributions, essentially providing free money toward your retirement.

Your 401(k) contributions receive favorable tax treatment. Depending on which type you choose, you'll either get tax benefits when you contribute or when you withdraw the money in retirement.

Let’s go deeper into how a 401(k) works and how to make the most of this employer-sponsored benefit

Types of 401(k) plans

The two primary 401(k) plan options are a traditional 401(k) and a Roth 401(k). Here's how they compare:

 

Traditional 401(k)

Roth 401(k)

2025 contribution limits

Up to $23,500. People age 50 and older can contribute an extra $7,500 as a catch-up contribution. People ages 60 to 63 have a catch-up contribution of $11,250.

Tax treatment of contributions

Contributions are made pre-tax.

Contributions are made after-tax. Any employer match must go into a pre-tax account.

Tax treatment of withdrawals

Distributions in retirement are taxed as ordinary income.

No taxes on qualified distributions.

Withdrawal rules

Withdrawals are taxed. Distributions before age 59 ½ may have penalties unless you meet an IRS exception.

Distributions and earnings are not taxed as long as the account has been held for at least five years and the distribution is on or after 59 ½ or due to disability or death.

Each type of 401(k) has distinct tax advantages.

  • Traditional 401(k) contributions immediately lower your tax burden. As an example, if you earn $65,000 annually and contribute $5,000, only $60,000 of your earnings gets taxed that year.
  • Roth 401(k)s, on the other hand, are a good option for those beginning their careers at lower income levels and tax rates. While your paycheck shrinks more initially since contributions are after-tax, you benefit later with tax-free retirement withdrawals.

Many employers offer both options, allowing you to diversify your tax strategy across both account types.

Your 401(k) contributions receive favorable tax treatment. Depending on which type you choose, you'll either get tax benefits when you contribute or when you withdraw the money in retirement.

How does a 401(k) work?

Your employer determines whether to offer a 401(k) as well as a contribution match. Common matching arrangements include:

  • Dollar-for-dollar match: Your employer matches 100% of contributions up to a certain percentage (typically 3-6% of your salary).
  • Partial match: Your employer contributes $0.50 for every dollar you contribute, up to a specified limit.

Consider this example: You earn $5,000 a month and your employer offers a 50% match up to 6% of your wages. Contributing $300 monthly (6%) triggers a $150 employer match, totaling $450 in monthly retirement savings.

Starting in 2025, the SECURE 2.0 Act requires most employers to automatically enroll eligible employees into existing 401(k) and 403(b) plans at 3-10% contribution rates, increasing annually to a maximum of 15%. You maintain control over your investment selections from your plan's available options.

How does a 401(k) earn money?

Your 401(k) will offer different investment options, typically including:

  • Index funds: Low-cost funds tracking market benchmarks.
  • Mutual funds: Professionally managed portfolios.
  • Target-date funds: Automatically adjust risk based on your retirement timeline.
  • Exchange-traded funds (ETFs): Diversified, tradeable fund options.

You can decide how much of your 401(k) balance you want to invest in different funds or allow your plan to automatically enroll you. Regardless of what you choose, you’ll be able to change your investment allocations and rebalance your portfolio. If you’re unsure how to invest your contributions, a financial professional can provide education and guidance on asset allocation strategies.

It's in your best interest to start saving as soon as possible. The sooner you start contributing to a 401(k), the more opportunity for compound growth. Compound growth allows you to grow your investment on both the money you saved and the growth you’ve already achieved. Over time, your compound earnings could be larger than the contributions you made to your 401(k).

How much should I contribute to my 401(k)?

How much you contribute to a 401(k) depends on your personal financial situation. To receive the most benefits, the general recommendation is to set your 401(k) contributions to ensure you receive at least the full employer match.

There is a cap on how much you can contribute to your 401(k). To account for inflation, the maximum amount an employer and employee can contribute is adjusted yearly.

The 2025 contribution limits are:

  • Under age 50: $23,500
  • Ages 60-63: Additional $11,250 catch-up contributions


Beyond the employer match, aim to maximize your contributions when possible.

When can you withdraw from a 401(k)?

Typically, you can withdraw from a 401(k) without penalties when you’re 59 ½ years old and have separated from your employer.  Generally, required minimum distributions (RMDs) from traditional 401(k)s begin at age 73, or April 1 of the year after you turn 73, whichever is later. For those born in 1959 or later, this age will increase to 75 in 2033. The amount you’ll be required to withdraw will depend on your age and the balance in your account.

You can borrow money from your 401(k), but early withdrawal before age 59 ½ may lead to a 10% penalty fee, federal income tax, state income tax and other related taxes. However, the IRS does allow for certain exceptions regarding financial hardship. These may include:

  • Permanent disability
  • Qualified medical expenses
  • Higher education costs
  • First-time home purchase
  • Military service

Note that restrictions may apply, so be sure to consult with a financial and tax professional to fully understand the rules and tax ramifications. Read more about 401(k) and IRA withdrawal rules.

What happens to a 401(k) when you leave your job?

You have four main options for your 401(k) whenever you change jobs. These include:

  • Cash out your earnings. This option gives you immediate access to your money. However, your funds may be subject to federal income tax, a 10% penalty for early withdrawal (if you’re younger than 59 ½), and other state and local taxes. 
  • Leave funds in your former employer's retirement plan. Your account will continue to be invested, but you won't be able to make additional contributions. If you do decide to leave money with your former employer, remember to check in on the account's performance.
  • Transfer funds into your new employer's retirement plan option (if your new plan allows it). You’ll be able to continue making contributions and manage the rolled-over money and new contributions collectively.
  • Roll funds into an outside IRA. You may have more investment options through an IRA. A direct 401(k) rollover to an IRA will not incur federal income tax and earnings are tax-deferred until withdrawal.

A few other considerations as you decide which option is right for you:

  • Account for available investment options, investment and account fees, ease of managing the accounts, and retirement account guidelines (such as loans, withdrawals, or creditor access) when making your decision.
  • It’s advisable to directly transfer funds from your former account into your new employer’s plan or IRA. Indirect rollovers (where you receive the check instead of the new provider) may incur a 20% federal withholding.
  • Be certain to transfer pre-tax funds into pre-tax funds and Roth into Roth.
  • If you have less than $1,000 in your account, your employer can write you a check for the balance. You’ll then have 60 days to reinvest it with a new company’s 401(k) plan or an IRA. After 60 days, you’ll face the 10% tax penalty and income tax.

 

Learn more about your 401(k) rollover options.

Frequently asked questions

Explore more

IRA versus 401(k): What’s the difference?

Understanding the differences between IRAs and 401(k)s—from contributions and taxes to withdrawals—can help you determine which account best aligns with your financial goals.

Open an IRA today.

Whether you prefer investing on your own or want professional guidance, we have an option to fit your needs.

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Disclosures

A rollover of qualified plan assets into an IRA is not your only option. Before deciding whether to keep assets in your current employer's plan, to roll assets to a new employer's plan, to take a cash distribution or to roll assets into an IRA, clients should be sure to consider potential benefits and limitations of all options. These include total fees and expenses, range of investment options available, penalty-free withdrawals, availability of services, protection from creditors, RMD planning, and taxation of employer stock. Discuss rollover options with your tax advisor for tax considerations.

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