401(k) Basics and 2026 Contribution Limits

A 401(k) is a tax-advantaged retirement savings account offered through your employer. It lets you set aside a portion of each paycheck — before or after taxes — and invest it for retirement. This page covers how 401(k) plans work, what the contribution limits are for 2026, and what to know about the investment options available inside the plan.

What Is a 401(k)?

The name comes from the section of the U.S. tax code that created it: Internal Revenue Code section 401(k). A 401(k) is a defined contribution plan, meaning that what you accumulate over time depends on how much you contribute, what your employer contributes, and how those contributions perform as investments. This is different from a traditional pension, which promises a fixed monthly payment in retirement regardless of investment results.

How contributions work. You elect to defer a percentage of each paycheck — or a fixed dollar amount — into the plan. That money is deducted before it hits your bank account and goes directly into your 401(k). Depending on the type of contribution you choose (traditional pre-tax or Roth after-tax), the tax treatment differs at contribution time and again at withdrawal.

The employer match. Many employers contribute additional money to your 401(k) based on what you put in — for example, matching 50% of your contributions up to 6% of your salary. The match formula varies significantly by employer and plan, but the underlying concept is consistent: the employer adds money on top of your own contributions, up to a cap. Employer matching rules, vesting schedules, and eligibility requirements are all defined in your plan documents.

Tax-deferred growth. One of the defining features of a 401(k) is that investments inside the account grow without being taxed each year. You don’t owe taxes on dividends, interest, or capital gains as they accumulate inside the plan. The tax event is deferred — until you take a distribution (for traditional accounts) or has already been paid at contribution time (for Roth accounts).

Early withdrawal rules. The IRS generally imposes a 10% penalty on distributions taken before age 59½, in addition to applicable income taxes. There are specific exceptions — disability, certain medical expenses, substantially equal periodic payments (Rule 72(t)), separation from service at age 55 or older in some circumstances, and others — but the baseline design of a 401(k) is long-term accumulation, not a short-term or liquid savings vehicle.

Required Minimum Distributions (RMDs). Traditional 401(k) balances are subject to required minimum distributions starting at age 73 under current law. The IRS calculates a minimum amount you must withdraw each year beginning at that age. Roth 401(k) accounts held inside a workplace plan are also subject to RMDs, although rolling a Roth 401(k) to a Roth IRA at retirement removes the RMD requirement entirely. These rules are worth understanding before the distribution phase begins.

2026 Contribution Limits

The IRS adjusts 401(k) contribution limits annually for inflation. For 2026, the limits increased across most categories. All figures below are sourced from IRS Notice 2025-67 and the IRS 2026 retirement plan announcement.

Limit Type	2026 Amount
Employee elective deferral (traditional + Roth combined)	$24,500
Standard catch-up contribution (age 50–59 and 64+)	$8,000
Maximum with standard catch-up (age 50+)	$32,500
SECURE 2.0 “super catch-up” (ages 60–63)	$11,250
Maximum with super catch-up (ages 60–63)	$35,750
Combined employee + employer (§415(c))	$72,000

Current as of August 2026. Every figure on this page is a tax-year 2026 amount. The IRS sets the following year’s limits by inflation adjustment and typically announces them in late October or early November, so if you are reading this after that point, check the two IRS links above for the 2027 amounts before you act on any number here.

The Basic Limit: $24,500

In 2026, employees can defer up to $24,500 of their own earnings into a 401(k) plan — the elective deferral limit under IRC §402(g). This cap applies to the combined total of traditional pre-tax and Roth after-tax contributions across all employer-sponsored plans you participate in. If you split contributions between a traditional and Roth 401(k) at the same employer, the $24,500 ceiling covers both together.

Standard Catch-Up: $8,000 (Age 50+)

Employees who are age 50 or older by December 31 of the calendar year can make additional elective deferrals — called catch-up contributions — on top of the $24,500 base. For 2026, the standard catch-up limit is $8,000, bringing the maximum employee contribution for eligible participants to $32,500.

The standard $8,000 catch-up applies to participants aged 50–59 and to those aged 64 and older. The separate “super catch-up” described below applies specifically to the 60–63 age window.

Source: IRS Retirement Topics — Catch-Up Contributions.

SECURE 2.0 “Super Catch-Up”: $11,250 (Ages 60–63)

The SECURE 2.0 Act of 2022 created an enhanced catch-up contribution for a specific age window. Employees who are ages 60, 61, 62, or 63 during the calendar year are eligible for a higher catch-up of $11,250 — instead of the standard $8,000 — bringing their total deferral maximum to $35,750 in 2026.

The window is narrow: once you turn 64, the super catch-up no longer applies and you revert to the standard $8,000 catch-up. The provision covers 401(k) plans, 403(b) plans, most governmental 457(b) plans, and the federal Thrift Savings Plan.

Source: IRS Notice 2025-67; IRS Retirement Topics — Catch-Up Contributions.

Combined Employee + Employer Limit: $72,000 (§415(c))

The IRS also caps the total amount that can be added to any single participant’s 401(k) account in a given year — counting both employee deferrals and all employer contributions (match, profit-sharing, and other employer additions). For 2026, this combined limit under IRC §415(c) is $72,000.

Catch-up contributions are generally not subject to the §415(c) ceiling, so the effective maximum for participants eligible for the super catch-up (ages 60–63) can reach $35,750 + additional employer contributions, subject to plan terms.

Source: IRS Notice 2025-67, §415(c) table.

Roth Catch-Up Requirement for Higher Earners (SECURE 2.0)

SECURE 2.0 introduced a rule that affects participants with higher incomes who make catch-up contributions. Beginning in plan years subject to the new requirement, employees who earned more than $150,000 in FICA wages from their current employer in the prior year must designate catch-up contributions as Roth — pre-tax catch-up is not available to this group in plans that offer a Roth feature. The $150,000 threshold is indexed annually; for 2026, it is based on 2025 FICA wages at the same employer.

If a plan does not offer a Roth account option, the pre-tax catch-up can still be made regardless of income. Contact your plan administrator to confirm how your plan is handling this requirement.

Source: IRS — Final Regulations on the Roth Catch-Up Rule (SECURE 2.0).

Traditional vs. Roth 401(k): The Tax-Timing Tradeoff

Most plans today offer both a traditional pre-tax and a Roth after-tax 401(k) option. The 2026 contribution limits are identical for both — the difference is entirely about when taxes are paid.

Traditional 401(k). Contributions reduce your taxable income in the year you make them. A $24,500 deferral reduces your W-2 income by $24,500 for federal income tax purposes. Growth inside the account is tax-deferred. When you withdraw money in retirement, those withdrawals are taxed as ordinary income at your tax rate at that time.

Roth 401(k). Contributions are made with dollars you’ve already paid income tax on — no deduction at contribution time. Growth inside the account is tax-free. Qualified withdrawals in retirement (generally after age 59½ and with the account open for at least five years) are not taxed at all.

The core question is: do you expect your tax rate to be higher now or in retirement? If higher now, deferring taxes (traditional) has appeal. If higher later, paying taxes now (Roth) may be more advantageous. Many participants use both account types simultaneously to hedge against future tax-rate uncertainty — the $24,500 limit can be split any way you choose between traditional and Roth at the same plan.

One practical note: Roth 401(k) balances rolled to a Roth IRA at retirement are not subject to RMDs, which creates flexibility for participants who do not need to draw down the account immediately. Traditional balances do not have this option.

There is no universally correct choice between traditional and Roth. The tradeoffs depend on current income, expected retirement income, Social Security timing, estate planning goals, and other individual factors that fall outside the scope of general retirement-account education. A tax professional or enrolled actuary can model both scenarios given your specific situation.

How 401(k) Money Gets Invested

Your 401(k) contributions don’t sit in cash — they are invested according to an allocation you choose from among the options your plan offers. The range of choices varies considerably by employer. Most plans provide:

Target-date funds. A single-fund option designed around a target retirement year. A “2045 Fund,” for example, holds a relatively aggressive equity mix today and automatically shifts toward more conservative allocations as 2045 approaches. Target-date funds are the default investment in many plans because they require no ongoing rebalancing decisions.

Index funds. Passively managed funds that track a market index — the S&P 500, total U.S. market, international equity, bond index, etc. Most large employer plans include a core lineup of index funds across major asset classes. Expense ratios on index funds in 401(k) plans are generally low relative to actively managed alternatives.

Actively managed funds. Funds where a portfolio manager selects holdings with the goal of outperforming a benchmark. These typically carry higher expense ratios than index funds.

Stable value and money market funds. Capital-preservation options that invest in short-term, lower-risk instruments. Commonly used by participants approaching retirement or as a temporary holding option.

Self-Directed Brokerage Window (SDBA). Some plans offer a brokerage window — also called a self-directed brokerage account, PCRA (Personal Choice Retirement Account at Schwab), or similar branded name — that gives participants access to a broader universe of individual stocks, ETFs, and mutual funds beyond the standard plan menu. Not every employer plan offers this option, and participation typically requires an additional enrollment step.

A self-directed brokerage window inside a 401(k) functions similarly to a taxable brokerage account in terms of execution: the participant places orders themselves, at their own discretion, using whatever process or research source they rely on. The retirement-account wrapper provides the tax treatment; the investment choices and execution are entirely self-directed.

For investors who take a structured, self-directed approach to managing their portfolios, the 401(k)‘s brokerage window is a natural extension of that framework inside the retirement account. More on what self-directed investing looks like in practice: The Self-Directed Investor’s Guide to Expert-Recommendation Services.

Frequently Asked Questions

What is the 401(k) contribution limit for 2026?

The employee elective deferral limit for 2026 is $24,500 (IRS Notice 2025-67). Employees age 50 and older can contribute an additional $8,000 standard catch-up, for a maximum of $32,500. Employees who turn ages 60, 61, 62, or 63 in 2026 are eligible for an enhanced “super catch-up” of $11,250 instead of the standard catch-up, for a maximum of $35,750.

What is the difference between a traditional and Roth 401(k)?

A traditional 401(k) uses pre-tax dollars — contributions reduce your taxable income now, and withdrawals in retirement are taxed as ordinary income. A Roth 401(k) uses after-tax dollars — no deduction at contribution, but qualified withdrawals in retirement are tax-free. The 2026 limits are the same for both. Many participants split contributions between traditional and Roth to hedge against future tax-rate changes.

What happens to my 401(k) if I change jobs?

You generally have four options: leave the balance in the former plan, roll it into your new employer’s plan, roll it into an IRA, or take a cash distribution. Cashing out typically triggers ordinary income taxes and a 10% early withdrawal penalty if you are under age 59½. Rolling to an IRA or new employer plan preserves the account’s tax status without a taxable event.

Can I contribute to both a 401(k) and an IRA in the same year?

Yes — the two accounts have separate contribution limits. However, the deductibility of traditional IRA contributions may be phased out if you are covered by a workplace plan and your income exceeds IRS thresholds. Roth IRA contributions are also subject to income limits regardless of workplace plan coverage. Check IRS Publication 590-A for the current year’s phase-out ranges.

Does the employer match count toward the $24,500 limit?

No. Employer contributions do not count against the employee elective deferral limit. They do count toward the combined employee + employer cap (§415(c)), which is $72,000 for 2026. Catch-up contributions for eligible participants are generally not counted against the §415(c) ceiling.

What is the SECURE 2.0 super catch-up for ages 60 to 63?

The SECURE 2.0 Act created an enhanced catch-up for employees who are ages 60, 61, 62, or 63 during the year. For 2026, this is $11,250 — higher than the standard $8,000. Combined with the $24,500 base, employees in this window can contribute up to $35,750. The limit reverts to $8,000 at age 64. Source: IRS Notice 2025-67.

Related reading: the self-directed investor’s guide, getting started, and the Stock Actions strategies.