401(k) retirement plans explained: What they are and how they work
Understanding how a 401(k) operates, contribution limits, withdrawal rules, and how to balance retirement investments with cash reserves.
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Key takeaways
A 401(k) is a workplace retirement account that offers special tax benefits, allowing you to contribute money before taxes are taken out (traditional) or after taxes are paid (Roth).
The IRS adjusts contribution limits for inflation, offering higher "catch-up" limits for workers aged 50 and older, including a special tier for ages 60 to 63.
Early withdrawals before age 59½ usually trigger a 10% IRS penalty on top of normal income taxes, though there are a few exceptions and loan options.
What is a 401(k) plan?
A 401(k) is a retirement savings plan offered by your employer. It allows you to automatically save a portion of your paycheck and invest it in mutual funds, target-date funds, or exchange-traded funds (ETFs) while enjoying special tax benefits.
Many employers offer matching contributions, meaning they will add extra money to your account up to a certain percentage of your salary. The IRS sets the rules for 401(k) plans, including how much you can contribute each year and when you can withdraw the money.
Traditional vs. Roth 401(k): What is the difference?
The main difference between a traditional and a Roth 401(k) is when you pay taxes on the money. Traditional 401(k) contributions are made with pre-tax income, lowering current-year taxable earnings while withdrawals in retirement are taxed as ordinary income. Roth 401(k) contributions use after-tax income, allowing qualified retirement distributions to be withdrawn tax-free.
Traditional 401(k)
A traditional 401(k) takes money out of your paycheck before taxes are applied. This lowers your taxable income for the current year. The money grows tax-free until you retire, but you will pay income taxes on whatever you withdraw. This structure is commonly evaluated by savers who anticipate being in a lower tax bracket during retirement than during their peak earning years.
Roth 401(k)
A Roth 401(k) takes money out of your paycheck after taxes have already been applied. Your investments grow tax-free, and you will not pay any federal or state income taxes when you withdraw the money in retirement. This is often a good choice for younger workers or savers who expect higher income tax rates in the future.
Feature | Traditional 401(k) | Roth 401(k) |
Contribution tax treatment | Pre-tax (reduces current-year taxable income) | After-tax (no current-year deduction) |
Investment growth | Tax-deferred | Tax-free |
Withdrawal taxation | Taxed as ordinary income upon distribution | Tax-free (on qualified withdrawals) |
Employer match tax treatment | Tax-deferred (unless designated as Roth under SECURE 2.0) | Tax-deferred (unless designated as Roth under SECURE 2.0) |
Lifetime Required Minimum Distributions (RMDs) | Mandatory starting at age 73 | Exempt from lifetime RMDs |
Best used for | Savers expecting a lower tax bracket in retirement | Savers expecting an equal or higher tax bracket in retirement |
How does a 401(k) work?
A 401(k) operates through coordinated payroll deductions and long-term portfolio compounding. Once enrolled, an employee designates a percentage of gross pay to be deposited directly into their chosen plan options on each pay date. Key features include:
Automatic payroll deductions: Because the money comes straight out of your paycheck, you save consistently before you have a chance to spend it.
Investment growth: Contributions are allocated across diversified options such as target-date retirement funds, index funds, and bond funds. Because of the tax benefits, your investment returns can build on themselves year after year without being slowed down by annual taxes.
Employer match incentives: Many employers offer matching formulas (e.g., matching 50% of contributions up to 6% of salary). Capturing this match provides additional employer-funded contributions to your account.
Vesting schedules: While employee contributions are always 100% owned by the worker, employer matching funds may be subject to a vesting schedule (either graded or cliff vesting), requiring a set tenure of employment before matching dollars are fully retained upon departure.
What are the 401(k) contribution limits?
For 2026, the IRS employee elective deferral limit is $24,500 (up from $23,500 in 2025). Workers aged 50 and older can make standard catch-up contributions of $8,000, while a specialized catch-up limit of $11,250 is available for individuals aged 60 to 63 under the SECURE 2.0 Act.
The table below details annual contribution caps across age tiers:
Note: Under SECURE 2.0 rules, catch-up contributions for employees whose prior-year wages exceed $150,000 must be directed into a Roth 401(k) on an after-tax basis.
Contribution category | 2025 limit | 2026 limit | Eligibility criteria |
Standard employee limit | $23,500 | $24,500 | All eligible participating employees |
Catch-up limit (ages 50+) | $7,500 | $8,000 | Participants aged 50 and older |
SECURE 2.0 higher catch-up (ages 60 to 63) | $11,250 | $11,250 | Participants aged 60, 61, 62, and 63 |
Total limit (employee + employer) | $70,000 | $72,000 | Combined additions across all sources (excluding catch-ups) |
Total maximum limit (age 60–63) | $81,250 | $83,250 | Combined additions including higher catch-up allowance |
401(k) withdrawal rules and penalties
Withdrawing money from a traditional 401(k) before age 59½ usually triggers a 10% IRS penalty on top of normal income taxes. Once you reach age 59½, you can withdraw funds without any early penalties.
Statutory early withdrawal exceptions
The IRS permits penalty-free (though still taxable) early distributions under limited circumstances:
The Rule of 55: Employees who leave or separate from their job during or the year after they turn 55 can withdraw funds from that specific employer’s 401(k) without the 10% penalty.
Scheduled payments: It’s possible to set up a strict, IRS-approved schedule of annual withdrawals based on your life expectancy to avoid the penalty.
Qualified hardship distributions: For those facing immediate, heavy financial needs — like a massive medical bill or potential eviction — may qualify for a penalty-free withdrawal.
401(k) loans
Some plan administrators permit participants to borrow against their account balance, typically up to 50% of the vested balance or $50,000 (whichever is less). While loans bypass income tax and early distribution penalties if repaid on schedule, there are major risks. The borrowed money misses out on stock market growth, and if you leave your job before the loan is fully repaid, the remaining balance is treated as an early withdrawal, triggering income taxes and penalties.
Required minimum distributions (RMDs)
Required minimum distributions (RMDs) are mandatory annual withdrawals that account owners must take once reaching a specific age set by federal law. Under current statutes, traditional 401(k) owners must begin taking RMDs by April 1 of the year following the year they turn age 73. Subsequent annual distributions must be completed by December 31.
The IRS uses a specific formula to calculate exactly how much you must withdraw each year based on your life expectancy. Failing to withdraw the full amount results in a steep 25% tax penalty on the money you were supposed to take out. Keep in mind that Roth 401(k) accounts are exempt from these mandatory withdrawals.
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How to start and manage a 401(k)
Setting up a 401(k) usually involves a few basic steps:
Verify plan availability and eligibility: Savers typically consult their benefits coordinator or human resources department to determine service-time requirements and enrollment windows.
Select an account structure: Savers decide whether a traditional 401(k), a Roth 401(k), or a combination of both makes the most sense for their tax situation.
Establish an initial savings rate: Many savers choose to contribute at least enough to capture the full employer match, gradually increasing deferrals by 1% each year.
Choose your investments: Savers then choose how their money will be invested. Many people select a target-date fund (which automatically adjusts risk as you get older) or low-cost index funds.
Designate account beneficiaries: Savers record primary and contingent beneficiaries on their account portal, keeping records updated following major life events.
What happens to a 401(k) when leaving a job?
When separating from an employer, savers generally have four options for their vested 401(k) assets:
Maintain funds in the former employer's plan: Often permitted if account balances exceed $7,000, preserving existing investment options.
Direct rollover to a new employer's 401(k): Consolidates retirement accounts into the new plan while maintaining tax-deferred status without tax penalties.
Rollover into an Individual Retirement Account (IRA): Moves funds into a traditional or Roth IRA, frequently providing a broader selection of individual equities, ETFs, and lower-cost index funds.
Cash distribution: Liquidating the account triggers immediate mandatory 20% federal tax withholding, full ordinary income taxation, and a 10% penalty if under age 59½.
Advantages and disadvantages of a 401(k)
Evaluating the structural trade-offs of an employer plan clarifies how to coordinate it with outside savings products:
Advantages
Substantial annual contribution ceilings: Allows savers to save up to $24,500 (or up to $32,500+ with catch-ups) annually in tax-advantaged accounts.
Employer match incentives: Employer contributions provide additional compensation that accelerates account growth.
Automated investing: Systematic deductions instill disciplined saving habits directly from earnings.
Disadvantages
Limited investment menus: Account holders are restricted to the proprietary fund options chosen by the plan sponsor.
Liquidity constraints: Withdrawing funds prior to age 59½ incurs tax liabilities and a 10% early withdrawal penalty outside narrow exceptions.
Administrative plan fees: Recordkeeping and management fees can erode long-term compounding if fund expense ratios are high.
Complementing your 401(k) with Raisin
While a 401(k) is an effective vehicle for multi-decade retirement investing, maintaining cash reserves outside of employer plans is essential for financial balance. Raisin offers an intuitive marketplace that connects savers directly with competitive high-yield savings accounts and certificates of deposit from a nationwide network of partner banks and credit unions.
Frequently asked questions
Can I contribute to both a 401(k) and an IRA in the same year?
Yes. Eligible individuals can contribute to both an employer 401(k) and an IRA in the same calendar year. However, tax deductibility for traditional IRA contributions may phase out at higher income levels if you are actively covered by an employer retirement plan.
Does employer matching count toward my personal 401(k) limit?
No. Employer matching contributions do not count toward your individual employee elective deferral cap ($24,500 in 2026). Instead, combined employee and employer contributions are governed by the overall defined contribution limit ($72,000 in 2026).
What happens if I accidentally over contribute to my 401(k)?
Excess contributions must be distributed back to the employee, along with any attributable earnings, by the tax filing deadline (typically April 15 of the following year) to avoid double taxation on the excess amount.
The above article is intended to provide generalized financial information designed to educate a broad segment of the public; it does not give personalized tax, investment, legal, or other business and professional advice. Before taking any action, you should always seek the assistance of a professional who knows your particular situation for advice on taxes, your investments, the law, or any other business and professional matters that affect you and/or your business.
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