What Is a 401(k) Retirement Plan? Limits, Match, Fees, and Withdrawals

A 401(k) is an employer-sponsored retirement plan. You choose how much pay to contribute, the plan applies its tax rules, and the money is invested in options the plan offers. An employer may add a match or other contribution.

A 401(k) retirement plan is a powerful account. It is not the whole retirement-income plan. You still need to decide how much to save, how to invest, when to withdraw, how Social Security and taxes fit, and how long the money may need to last.

How a 401(k) plan works

The basic flow is:

You enroll and choose a contribution rate.

Payroll sends the employee deferral to the plan.

The employer may add a match or other contribution.

You choose investments from the plan menu.

The account changes with contributions, fees, gains, and losses.

Plan and tax rules control loans, withdrawals, and rollovers.

A 401(k) account flow based on Department of Labor participant guidance. Your summary plan description controls plan-specific rules.

The money is yours subject to plan and tax rules. Employer contributions may have a vesting schedule, which determines when you have a nonforfeitable right to them.

2026 401(k) contribution limit and catch-up contributions

For 2026:

Contribution rule | 2026 amount
Employee deferral limit | $24,500
General age-50-or-older catch-up | $8,000
Higher catch-up for ages 60 through 63 | $11,250
Overall annual additions limit before catch-up | $72,000

The employee deferral limit generally combines traditional and Roth 401(k) deferrals. It can also interact with deferrals to another employer plan. Employer money does not use the $24,500 employee limit, but it counts toward the broader annual-additions rule.

2026 federal limits from the IRS inflation-adjustment announcement. Plan terms and compensation limits can reduce what one participant may contribute.

How a 401(k) match works

A match is employer money tied to an employee contribution formula.

Example: a plan might match 50 cents per dollar on the first 6% of pay contributed. A worker who contributes 6% would receive a 3% employer match under that formula. The actual formula can be different.

Check:

the match formula;

which pay counts;

whether each payroll period is tested separately;

whether the plan makes a year-end true-up;

the vesting schedule; and

what happens after a leave or job change.

Do not contribute more than cash flow can safely support only to chase a match. Do understand the amount of employer money you may leave behind by contributing less.

Traditional 401(k) versus Roth 401(k)

Question | Traditional 401(k) | Roth 401(k)
Employee contribution | Generally pre-tax for federal income tax | After-tax
Current taxable income | Usually lower | Not lowered by the Roth deferral
Qualified retirement withdrawal | Generally taxable | Generally tax-free when rules are met
Investment menu | Plan menu | Usually the same plan menu
Employer match | Plan-dependent tax treatment | Plan document controls

The better choice depends on current and expected future tax rates, state tax, cash flow, other account types, and flexibility. Splitting contributions can reduce the need to guess one future rate.

401(k) fees and investment choices

Fees reduce the amount that remains invested.

Look for:

plan administration fees;

individual service fees;

each fund's expense ratio;

managed-account or advice fees;

loan fees; and

trading or brokerage-window costs.

The Department of Labor requires participant fee disclosures for many plans. Compare investments by job, diversification, risk, cost, and tracking, not only recent return. The index funds and ETFs guide explains expense ratios and index choices.

401(k) withdrawal rules

Withdrawing from a 401(k) can create income tax and, for some early distributions, an additional 10% tax. Exceptions exist. The plan may be stricter than the tax code about when a distribution is available.

Common paths include:

retirement or separation from service;

an in-service withdrawal allowed by the plan;

a hardship distribution;

a plan loan;

a required minimum distribution; or

a rollover after a job change.

A hardship withdrawal is not a loan. It permanently removes money from the account and can create tax. A loan may avoid current tax when it follows plan and tax rules, but job loss, missed payments, interest, and reduced invested time create risk.

401(k) rollover choices after leaving a job

Common options are:

leave it in the old plan if allowed;

roll it to the new employer's plan if accepted;

roll it to an IRA; or

cash it out.

Compare fees, investments, services, creditor protection, loan access, withdrawal rules, consolidation, and tax treatment. A direct rollover can avoid mandatory withholding that may apply when a distribution is paid to you.

A job-change decision map based on Department of Labor rollover guidance. It is not a rule that everyone should roll to an IRA.

A 401(k) account is not a complete retirement-income plan

The account balance does not tell you:

how much can be spent each year;

how long retirement may last;

how inflation affects expenses;

how Social Security fits;

which account to use first;

how taxes change withdrawals;

what happens in a market decline; or

how a spouse or heir is protected.

Build the income plan around essential spending, flexible spending, Social Security, pensions, cash reserves, taxes, investments, insurance, and estate instructions. The Social Security claiming guide covers one major piece.

Common questions

What is a 401(k) in simple terms?

It is a workplace retirement account funded through payroll. It may include employer money. Tax treatment, investments, fees, vesting, loans, and withdrawals follow federal rules and the plan document.

How much should I put in my 401(k)?

Use a rate that captures any valuable match when practical, fits current cash flow, and moves the retirement plan forward. The answer is not automatically the federal maximum.

Can I withdraw my 401(k) before age 59½?

Sometimes. The plan must allow a distribution, and tax or penalty rules depend on the reason, age, and account type. Review the exact exception before withdrawing.

Should I roll a 401(k) into an IRA?

Not automatically. An IRA can offer more investment choices, while a strong employer plan may have lower institutional costs, plan protections, or useful services. Compare the exact accounts.

401(k) vs. IRA: what is the main difference?

A 401(k) is tied to an employer plan and its menu, fees, and protections. An IRA is opened by an individual and can offer a wider market of investments. Tax treatment also depends on whether each account is traditional or Roth.

This guide is general education, not tax, legal, or investment advice. The summary plan description and current federal rules control your plan.

Sources

Internal Revenue Service, 401(k) and profit-sharing plan contribution limits. Accessed July 30, 2026.

Internal Revenue Service, 2026 401(k) and IRA limit announcement. Accessed July 30, 2026.

U.S. Department of Labor, What You Should Know About Your Retirement Plan. Accessed July 30, 2026.

U.S. Department of Labor, retirement tools and resources. Accessed July 30, 2026.

U.S. Department of Labor, retiring from a job. Accessed July 30, 2026.

U.S. Department of Labor, understanding retirement-plan fees. Accessed July 30, 2026.

Internal Revenue Service, 401(k) resource guide. Accessed July 30, 2026.

Internal Revenue Service, hardship distributions. Accessed July 30, 2026.

Internal Revenue Service, retirement-plan loans. Accessed July 30, 2026.

Internal Revenue Service, rollover chart. Accessed July 30, 2026.

Internal Revenue Service, required minimum distributions. Accessed July 30, 2026.