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| Meta Title | What is a 401(k)? | Fidelity |
| Meta Description | 401(k)s are the most popular way to save for retirement for good reason. Here's everything you need to know to start taking advantage of yours. |
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| Boilerpipe Text | Get the most from your workplace retirement plan.
Key takeaways
A 401(k) is a retirement savings plan that lets you invest a portion of each paycheck before taxes are deducted depending on the type of contributions made.
Because of 401(k) tax advantages, the federal government imposes some restrictions about when you can withdraw your 401(k) contributions.
401(k)s are the most popular retirement savings plan. Approximately 70 million Americans
1
—or about 43% of the working population
2
—use one to invest money they'll live off in retirement.
But just because they're common doesn't mean they're well understood. Whether you're a veteran retirement saver or are just getting started, here's what you need to know about 401(k)s and how they work.
What is a 401(k)?
Named for the tax code section that created it, a 401(k) is an employer-sponsored retirement savings plan with special tax benefits. (The exact tax advantages depend on which kind of 401(k) contributions you make—more on that later.) Employers typically offer 401(k)s as part of a benefits package to attract and retain workers.
Not everyone has access to a 401(k). Depending on your industry, you may be able to contribute to a similar retirement plan, like a 403(b) or 457(b), instead of a 401(k). Self-employed people can open a type of 401(k) on their own called a self-employed 401(k), and anyone who earns an income (or who is married to someone who does) can save for retirement—in addition to a 401(k) or in place of one—within an individual retirement account (IRA).
How does a 401(k) work?
401(k)s let you contribute part of each paycheck into a retirement account, where you can generally invest your assets in various types of mutual funds, such as index funds or target date funds.
The ability to invest for retirement is a major incentive to use a 401(k)—investing your money gives it a chance to benefit from compounding and a potential to grow over time. But 401(k)s also offer tax advantages. Unlike contributions to regular brokerage accounts, pre-tax contributions to a 401(k) are not taxed until you begin withdrawals in retirement. Unless an exception applies, distributions prior to turning 59½ may be subject to a 10% tax as an early distribution penalty in addition to federal income taxes. Depending on where you live, you may also be taxed at the state and local levels.
Some employers offer a second type of 401(k) called a Roth 401(k), in which you invest after-tax money today and don't pay income taxes on your withdrawals in retirement. Not sure which to pick? See whether contributing to a
Roth or traditional 401(k)
—or even both—makes sense for you.
401(k) advantages
401(k)s can be a helpful tool to fund a secure retirement. A few key benefits include:
Automation
The science is clear: We're more likely to save when we don't have to think about it.
3
That's where 401(k)s shine. By automatically funneling money from your paycheck to your retirement savings, there's no opportunity to spend the money on anything else.
Employer contributions
A key advantage of 401(k)s is that your employer may also contribute to help you save for retirement. This typically comes in the form of a 401(k) match, aka when your company agrees to contribute a certain amount based on what you contribute. This may come in the form of a full, dollar-for-dollar match up to a certain percentage of your salary or a partial match, where your employer matches a fraction of what you contribute, such as 50%, up to a certain percentage of your salary.
Fidelity suggests aiming to
contribute at least enough to get the full match amount
.
Compounding
The potential snowball effect of compounding makes early saving or investing, particularly in tax-advantaged retirement accounts like a 401(k), that much more enticing since the earlier you start investing, the more compounded returns you can hope to make.
401(k) contribution limits
The annual employee 401(k) contribution limit is $23,500 in 2025 for those under age 50. This increases to $24,500 in 2026. If you have more than one 401(k) account—such as a traditional and a Roth 401(k)—your combined contributions to both can't exceed the annual limit. Those age 50 and older can contribute an additional $7,500 as a catch-up contribution in 2025, which increases to $8,000 in 2026. In 2025, individuals aged 60 to 63 may be able to contribute up to $11,250 as a "super" catch-up contribution if your plan allows, while those aged 50 to 59 or 64 and older are eligible to contribute up to $7,500 as a regular catch-up contribution. In 2026, the "super" catch-up limit remains the same. Also in 2026, with the SECURE 2.0 Roth requirement for high earners in effect, if you earned more than $150,000 in 2025, any catch-up contributions must be Roth—meaning you'll get no upfront tax deduction. This income threshold adjusts for inflation annually. Check with your plan sponsor to find out what catch-up contributions are available to you.
Most 401(k) plans have formulas built in to keep you from running over your annual maximum. If you do exceed the annual 401(k) contribution limit, you have until April 15 of the following year to withdraw the excess contributions. If you don't fix the mistake, you'll be taxed twice, once on the excess contributions in the current year and a second time upon taking withdrawals.
401(k) withdrawal rules
The federal government imposes some restrictions on when you can withdraw money from your 401(k). Generally, you must wait until you're at least age 59½ to access the money without paying a penalty. If you take a withdrawal earlier than that, you may owe a 10% penalty on top of income tax in all but a few circumstances. Those
special exceptions
Opens in a new window
include distributions after both reaching age 55 and separating from your employer; financial hardship, including but not limited to medical costs; and to prevent foreclosure.
The SECURE 2.0 Act added new exceptions to the early withdrawal penalty for 401(k) and other retirement plans, allowing qualifying withdrawals for domestic abuse, emergency expenses, and disaster relief—to go along with previous exceptions for birth and adoption.
One way to avoid paying the penalty and income taxes is by
taking a loan from your 401(k)
, which some, but not all, plans allow. Keep in mind, however, that if you take a loan, the repayments will be deducted from your paycheck, which means your take-home pay will go down. Also know that any money you take out of your 401(k)—even for a short time—misses out on the opportunity to compound and grow. And if you change or leave your job, you might have to repay your loan in full in a very short time frame. If you can't repay the loan for any reason, the remaining loan balance is considered a taxable distribution from the account, and you may owe both taxes and a 10% penalty if you're under 59½.
Required minimum distributions (RMD)
According to the IRS, you must withdraw a certain amount of money each year starting at age 73 (this age will increase to 75 in 2033)—called required minimum distributions (
RMDs
)—from traditional IRAs and workplace retirement plans, including 401(k)s. One notable exception is that retirement plan account owners can delay taking their RMDs until the year in which they retire, unless they're a 5% owner of the business sponsoring the plan. This exception applies to workplace plans for still-working employees only, so owners of traditional IRA, SEP, and SIMPLE IRA accounts must begin taking RMDs once the accountholder reaches RMD age.Â
RMDs are equal to a percentage of your total eligible retirement account holdings as of December 31st the prior year and based on your life expectancy. The exact amount can be tricky to calculate, so consider reaching out to a financial or tax professional for help, or try Fidelity's
online calculator
. It's important to start withdrawing RMDs when required. Otherwise, you may end up owing a penalty of up to 25% of the amount not withdrawn—and that's in addition to taxes you may owe when you eventually take the withdrawal.
What happens to a 401(k) when I switch jobs?
You don't have to break up with your retirement plan when you and your employer part ways. You have several options for what to do with old 401(k)s: keeping your money where it is if your plan allows this, rolling it over to an IRA, transferring it to your new 401(k), or taking a withdrawal. Each has its pros and cons, which we cover in our guide to
401(k) rollovers
. |
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What is a 401(k)? \| Fidelity
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# What's a 401(k)?
Get the most from your workplace retirement plan.
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### Key takeaways
- A 401(k) is a retirement savings plan that lets you invest a portion of each paycheck before taxes are deducted depending on the type of contributions made.
- Because of 401(k) tax advantages, the federal government imposes some restrictions about when you can withdraw your 401(k) contributions.
401(k)s are the most popular retirement savings plan. Approximately 70 million Americans1—or about 43% of the working population2—use one to invest money they'll live off in retirement.
But just because they're common doesn't mean they're well understood. Whether you're a veteran retirement saver or are just getting started, here's what you need to know about 401(k)s and how they work.
### What is a 401(k)?
Named for the tax code section that created it, a 401(k) is an employer-sponsored retirement savings plan with special tax benefits. (The exact tax advantages depend on which kind of 401(k) contributions you make—more on that later.) Employers typically offer 401(k)s as part of a benefits package to attract and retain workers.
Not everyone has access to a 401(k). Depending on your industry, you may be able to contribute to a similar retirement plan, like a 403(b) or 457(b), instead of a 401(k). Self-employed people can open a type of 401(k) on their own called a self-employed 401(k), and anyone who earns an income (or who is married to someone who does) can save for retirement—in addition to a 401(k) or in place of one—within an individual retirement account (IRA).
### How does a 401(k) work?
401(k)s let you contribute part of each paycheck into a retirement account, where you can generally invest your assets in various types of mutual funds, such as index funds or target date funds.
The ability to invest for retirement is a major incentive to use a 401(k)—investing your money gives it a chance to benefit from compounding and a potential to grow over time. But 401(k)s also offer tax advantages. Unlike contributions to regular brokerage accounts, pre-tax contributions to a 401(k) are not taxed until you begin withdrawals in retirement. Unless an exception applies, distributions prior to turning 59½ may be subject to a 10% tax as an early distribution penalty in addition to federal income taxes. Depending on where you live, you may also be taxed at the state and local levels.
Some employers offer a second type of 401(k) called a Roth 401(k), in which you invest after-tax money today and don't pay income taxes on your withdrawals in retirement. Not sure which to pick? See whether contributing to a [Roth or traditional 401(k)](https://www.fidelity.com/viewpoints/retirement/spender-or-saver)—or even both—makes sense for you.
### 401(k) advantages
401(k)s can be a helpful tool to fund a secure retirement. A few key benefits include:
**Automation**
The science is clear: We're more likely to save when we don't have to think about it.3 That's where 401(k)s shine. By automatically funneling money from your paycheck to your retirement savings, there's no opportunity to spend the money on anything else.
**Employer contributions**
A key advantage of 401(k)s is that your employer may also contribute to help you save for retirement. This typically comes in the form of a 401(k) match, aka when your company agrees to contribute a certain amount based on what you contribute. This may come in the form of a full, dollar-for-dollar match up to a certain percentage of your salary or a partial match, where your employer matches a fraction of what you contribute, such as 50%, up to a certain percentage of your salary.
Fidelity suggests aiming to [contribute at least enough to get the full match amount](https://www.fidelity.com/learning-center/smart-money/how-much-should-i-contribute-to-my-401k).
**Compounding**
The potential snowball effect of compounding makes early saving or investing, particularly in tax-advantaged retirement accounts like a 401(k), that much more enticing since the earlier you start investing, the more compounded returns you can hope to make.
### 401(k) contribution limits
The annual employee 401(k) contribution limit is \$23,500 in 2025 for those under age 50. This increases to \$24,500 in 2026. If you have more than one 401(k) account—such as a traditional and a Roth 401(k)—your combined contributions to both can't exceed the annual limit. Those age 50 and older can contribute an additional \$7,500 as a catch-up contribution in 2025, which increases to \$8,000 in 2026. In 2025, individuals aged 60 to 63 may be able to contribute up to \$11,250 as a "super" catch-up contribution if your plan allows, while those aged 50 to 59 or 64 and older are eligible to contribute up to \$7,500 as a regular catch-up contribution. In 2026, the "super" catch-up limit remains the same. Also in 2026, with the SECURE 2.0 Roth requirement for high earners in effect, if you earned more than \$150,000 in 2025, any catch-up contributions must be Roth—meaning you'll get no upfront tax deduction. This income threshold adjusts for inflation annually. Check with your plan sponsor to find out what catch-up contributions are available to you.
Most 401(k) plans have formulas built in to keep you from running over your annual maximum. If you do exceed the annual 401(k) contribution limit, you have until April 15 of the following year to withdraw the excess contributions. If you don't fix the mistake, you'll be taxed twice, once on the excess contributions in the current year and a second time upon taking withdrawals.
### 401(k) withdrawal rules
The federal government imposes some restrictions on when you can withdraw money from your 401(k). Generally, you must wait until you're at least age 59½ to access the money without paying a penalty. If you take a withdrawal earlier than that, you may owe a 10% penalty on top of income tax in all but a few circumstances. Those [special exceptionsOpens in a new window](https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-tax-on-early-distributions) include distributions after both reaching age 55 and separating from your employer; financial hardship, including but not limited to medical costs; and to prevent foreclosure.
The SECURE 2.0 Act added new exceptions to the early withdrawal penalty for 401(k) and other retirement plans, allowing qualifying withdrawals for domestic abuse, emergency expenses, and disaster relief—to go along with previous exceptions for birth and adoption.
One way to avoid paying the penalty and income taxes is by [taking a loan from your 401(k)](https://www.fidelity.com/viewpoints/financial-basics/taking-money-from-401k), which some, but not all, plans allow. Keep in mind, however, that if you take a loan, the repayments will be deducted from your paycheck, which means your take-home pay will go down. Also know that any money you take out of your 401(k)—even for a short time—misses out on the opportunity to compound and grow. And if you change or leave your job, you might have to repay your loan in full in a very short time frame. If you can't repay the loan for any reason, the remaining loan balance is considered a taxable distribution from the account, and you may owe both taxes and a 10% penalty if you're under 59½.
### Required minimum distributions (RMD)
According to the IRS, you must withdraw a certain amount of money each year starting at age 73 (this age will increase to 75 in 2033)—called required minimum distributions ([RMDs](https://www.fidelity.com/learning-center/personal-finance/retirement/required-minimum-distributions))—from traditional IRAs and workplace retirement plans, including 401(k)s. One notable exception is that retirement plan account owners can delay taking their RMDs until the year in which they retire, unless they're a 5% owner of the business sponsoring the plan. This exception applies to workplace plans for still-working employees only, so owners of traditional IRA, SEP, and SIMPLE IRA accounts must begin taking RMDs once the accountholder reaches RMD age.
RMDs are equal to a percentage of your total eligible retirement account holdings as of December 31st the prior year and based on your life expectancy. The exact amount can be tricky to calculate, so consider reaching out to a financial or tax professional for help, or try Fidelity's [online calculator](https://digital.fidelity.com/prgw/digital/rmd/#/rmdform). It's important to start withdrawing RMDs when required. Otherwise, you may end up owing a penalty of up to 25% of the amount not withdrawn—and that's in addition to taxes you may owe when you eventually take the withdrawal.
### What happens to a 401(k) when I switch jobs?
You don't have to break up with your retirement plan when you and your employer part ways. You have several options for what to do with old 401(k)s: keeping your money where it is if your plan allows this, rolling it over to an IRA, transferring it to your new 401(k), or taking a withdrawal. Each has its pros and cons, which we cover in our guide to [401(k) rollovers](https://www.fidelity.com/viewpoints/retirement/what-to-do-with-an-old-401k).
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- [Managing taxes](https://www.fidelity.com/learning-center/personal-finance/managing-taxes/managing-taxes)
- [Changing jobs](https://www.fidelity.com/learning-center/life-events/career-planning)
- [Investing for income](https://www.fidelity.com/learning-center/trading-investing/investing-for-income)
- [Preparing for retirement](https://www.fidelity.com/learning-center/personal-finance/retirement/planning-your-retirement)
- [Saving for retirement](https://www.fidelity.com/learning-center/personal-finance/retirement/saving-for-retirement)
- [Living in retirement](https://www.fidelity.com/learning-center/personal-finance/retirement/planning-your-retirement)
- [Working for yourself](https://www.fidelity.com/learning-center/life-events/how-to-become-self-employed)
1\. "Quarter Retirement Market Data," Investment Company Institute (ICI), September 18, 2025.
2\. "Unemployment rate increases in the first half of 2024, before leveling off, while the labor force participation rate holds fairly steady," U.S. Bureau of Labor Statistics Monthly Labor Review, September 2025.
3\. Thaler, Richard H., and Shlomo Benartzi. "Save More TomorrowTM: Using Behavioral Economics to Increase Employee Saving." Journal of Political Economy 112, no. S1 (2004): S164–87.
This information is intended to be educational and is not tailored to the investment needs of any specific investor.
*Keep in mind that investing involves risk. The value of your investment will fluctuate over time, and you may gain or lose money.*
Fidelity does not provide legal or tax advice. The information herein is general and educational in nature and should not be considered legal or tax advice. Tax laws and regulations are complex and subject to change, which can materially impact investment results. Fidelity cannot guarantee that the information herein is accurate, complete, or timely. Fidelity makes no warranties with regard to such information or results obtained by its use, and disclaims any liability arising out of your use of, or any tax position taken in reliance on, such information. Consult an attorney or tax professional regarding your specific situation.
Recently enacted legislation made a number of changes to the rules regarding defined contribution, defined benefit, and/or individual retirement plans and 529 plans. Information herein may refer to or be based on certain rules in effect prior to this legislation and current rules may differ. As always, before making any decisions about your retirement planning or withdrawals, you should consult with your personal tax advisor.
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| Readable Markdown | Get the most from your workplace retirement plan.
### Key takeaways
- A 401(k) is a retirement savings plan that lets you invest a portion of each paycheck before taxes are deducted depending on the type of contributions made.
- Because of 401(k) tax advantages, the federal government imposes some restrictions about when you can withdraw your 401(k) contributions.
401(k)s are the most popular retirement savings plan. Approximately 70 million Americans1—or about 43% of the working population2—use one to invest money they'll live off in retirement.
But just because they're common doesn't mean they're well understood. Whether you're a veteran retirement saver or are just getting started, here's what you need to know about 401(k)s and how they work.
### What is a 401(k)?
Named for the tax code section that created it, a 401(k) is an employer-sponsored retirement savings plan with special tax benefits. (The exact tax advantages depend on which kind of 401(k) contributions you make—more on that later.) Employers typically offer 401(k)s as part of a benefits package to attract and retain workers.
Not everyone has access to a 401(k). Depending on your industry, you may be able to contribute to a similar retirement plan, like a 403(b) or 457(b), instead of a 401(k). Self-employed people can open a type of 401(k) on their own called a self-employed 401(k), and anyone who earns an income (or who is married to someone who does) can save for retirement—in addition to a 401(k) or in place of one—within an individual retirement account (IRA).
### How does a 401(k) work?
401(k)s let you contribute part of each paycheck into a retirement account, where you can generally invest your assets in various types of mutual funds, such as index funds or target date funds.
The ability to invest for retirement is a major incentive to use a 401(k)—investing your money gives it a chance to benefit from compounding and a potential to grow over time. But 401(k)s also offer tax advantages. Unlike contributions to regular brokerage accounts, pre-tax contributions to a 401(k) are not taxed until you begin withdrawals in retirement. Unless an exception applies, distributions prior to turning 59½ may be subject to a 10% tax as an early distribution penalty in addition to federal income taxes. Depending on where you live, you may also be taxed at the state and local levels.
Some employers offer a second type of 401(k) called a Roth 401(k), in which you invest after-tax money today and don't pay income taxes on your withdrawals in retirement. Not sure which to pick? See whether contributing to a [Roth or traditional 401(k)](https://www.fidelity.com/viewpoints/retirement/spender-or-saver)—or even both—makes sense for you.
### 401(k) advantages
401(k)s can be a helpful tool to fund a secure retirement. A few key benefits include:
**Automation**
The science is clear: We're more likely to save when we don't have to think about it.3 That's where 401(k)s shine. By automatically funneling money from your paycheck to your retirement savings, there's no opportunity to spend the money on anything else.
**Employer contributions**
A key advantage of 401(k)s is that your employer may also contribute to help you save for retirement. This typically comes in the form of a 401(k) match, aka when your company agrees to contribute a certain amount based on what you contribute. This may come in the form of a full, dollar-for-dollar match up to a certain percentage of your salary or a partial match, where your employer matches a fraction of what you contribute, such as 50%, up to a certain percentage of your salary.
Fidelity suggests aiming to [contribute at least enough to get the full match amount](https://www.fidelity.com/learning-center/smart-money/how-much-should-i-contribute-to-my-401k).
**Compounding**
The potential snowball effect of compounding makes early saving or investing, particularly in tax-advantaged retirement accounts like a 401(k), that much more enticing since the earlier you start investing, the more compounded returns you can hope to make.
### 401(k) contribution limits
The annual employee 401(k) contribution limit is \$23,500 in 2025 for those under age 50. This increases to \$24,500 in 2026. If you have more than one 401(k) account—such as a traditional and a Roth 401(k)—your combined contributions to both can't exceed the annual limit. Those age 50 and older can contribute an additional \$7,500 as a catch-up contribution in 2025, which increases to \$8,000 in 2026. In 2025, individuals aged 60 to 63 may be able to contribute up to \$11,250 as a "super" catch-up contribution if your plan allows, while those aged 50 to 59 or 64 and older are eligible to contribute up to \$7,500 as a regular catch-up contribution. In 2026, the "super" catch-up limit remains the same. Also in 2026, with the SECURE 2.0 Roth requirement for high earners in effect, if you earned more than \$150,000 in 2025, any catch-up contributions must be Roth—meaning you'll get no upfront tax deduction. This income threshold adjusts for inflation annually. Check with your plan sponsor to find out what catch-up contributions are available to you.
Most 401(k) plans have formulas built in to keep you from running over your annual maximum. If you do exceed the annual 401(k) contribution limit, you have until April 15 of the following year to withdraw the excess contributions. If you don't fix the mistake, you'll be taxed twice, once on the excess contributions in the current year and a second time upon taking withdrawals.
### 401(k) withdrawal rules
The federal government imposes some restrictions on when you can withdraw money from your 401(k). Generally, you must wait until you're at least age 59½ to access the money without paying a penalty. If you take a withdrawal earlier than that, you may owe a 10% penalty on top of income tax in all but a few circumstances. Those [special exceptionsOpens in a new window](https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-tax-on-early-distributions) include distributions after both reaching age 55 and separating from your employer; financial hardship, including but not limited to medical costs; and to prevent foreclosure.
The SECURE 2.0 Act added new exceptions to the early withdrawal penalty for 401(k) and other retirement plans, allowing qualifying withdrawals for domestic abuse, emergency expenses, and disaster relief—to go along with previous exceptions for birth and adoption.
One way to avoid paying the penalty and income taxes is by [taking a loan from your 401(k)](https://www.fidelity.com/viewpoints/financial-basics/taking-money-from-401k), which some, but not all, plans allow. Keep in mind, however, that if you take a loan, the repayments will be deducted from your paycheck, which means your take-home pay will go down. Also know that any money you take out of your 401(k)—even for a short time—misses out on the opportunity to compound and grow. And if you change or leave your job, you might have to repay your loan in full in a very short time frame. If you can't repay the loan for any reason, the remaining loan balance is considered a taxable distribution from the account, and you may owe both taxes and a 10% penalty if you're under 59½.
### Required minimum distributions (RMD)
According to the IRS, you must withdraw a certain amount of money each year starting at age 73 (this age will increase to 75 in 2033)—called required minimum distributions ([RMDs](https://www.fidelity.com/learning-center/personal-finance/retirement/required-minimum-distributions))—from traditional IRAs and workplace retirement plans, including 401(k)s. One notable exception is that retirement plan account owners can delay taking their RMDs until the year in which they retire, unless they're a 5% owner of the business sponsoring the plan. This exception applies to workplace plans for still-working employees only, so owners of traditional IRA, SEP, and SIMPLE IRA accounts must begin taking RMDs once the accountholder reaches RMD age.
RMDs are equal to a percentage of your total eligible retirement account holdings as of December 31st the prior year and based on your life expectancy. The exact amount can be tricky to calculate, so consider reaching out to a financial or tax professional for help, or try Fidelity's [online calculator](https://digital.fidelity.com/prgw/digital/rmd/#/rmdform). It's important to start withdrawing RMDs when required. Otherwise, you may end up owing a penalty of up to 25% of the amount not withdrawn—and that's in addition to taxes you may owe when you eventually take the withdrawal.
### What happens to a 401(k) when I switch jobs?
You don't have to break up with your retirement plan when you and your employer part ways. You have several options for what to do with old 401(k)s: keeping your money where it is if your plan allows this, rolling it over to an IRA, transferring it to your new 401(k), or taking a withdrawal. Each has its pros and cons, which we cover in our guide to [401(k) rollovers](https://www.fidelity.com/viewpoints/retirement/what-to-do-with-an-old-401k). |
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