401(k) Plan
Quick Definition
A 401(k) plan is an employer-sponsored retirement savings vehicle that allows employees to direct a portion of their paycheck into investment accounts on a pre-tax or after-tax Roth basis. For 2026, employees can contribute up to $24,500 per year, with catch-up contributions of $8,000 for workers age 50 and older and an enhanced $11,250 catch-up for those ages 60 through 63.
What It Means
The 401(k) plan is the primary retirement savings tool for most American workers. Named after Section 401(k) of the Internal Revenue Code, it was created in 1978 and became widespread in the 1980s as employers shifted away from traditional pensions toward defined contribution plans. In a pension, the employer bears the investment risk and guarantees a monthly payment. In a 401(k), the employee bears the investment risk and decides how much to save and how to invest.
The 401(k) offers two powerful tax advantages. First, pre-tax contributions reduce your taxable income in the year you make them. If you earn $80,000 and contribute $10,000, you are taxed as if you earned $70,000. Second, investment growth inside the account is tax-deferred. You pay no tax on dividends, interest, or capital gains as they compound over decades. You only pay income tax when you withdraw money in retirement.
Many employers also offer a matching contribution, which is the single most valuable benefit in most compensation packages. A typical match might be 100% of your contributions up to 3% of salary, plus 50% of contributions on the next 2%. That is free money with an immediate return that no investment can match.
How It Works
Enrollment and Contributions
- Enroll through your employer: Sign up through your HR department or benefits portal
- Set your contribution rate: Choose a percentage of each paycheck (e.g., 6% of salary)
- Choose pre-tax or Roth: Most plans now offer both options
- Select investments: Pick from the menu of funds your plan offers
- Contributions are automatic: Money is deducted from each paycheck before you see it
- Employer match is added: If your plan has a match, it is deposited according to the formula
- Money grows tax-deferred: No tax on investment gains while the money stays in the account
2026 Contribution Limits
The IRS raised contribution limits for 2026. According to IRS Notice 2025-67, the limits are:
| Contributor | Annual Limit |
|---|---|
| Employee under age 50 | $24,500 |
| Employee age 50 to 59 or 64+ | $32,500 ($24,500 + $8,000 catch-up) |
| Employee age 60 to 63 | $35,750 ($24,500 + $11,250 enhanced catch-up) |
| Total employee + employer (415(c) limit) | $72,000 |
| With standard catch-up | $80,000 |
| With enhanced catch-up (ages 60-63) | $83,250 |
| Maximum compensation considered | $360,000 |
New for 2026: Mandatory Roth Catch-Up for High Earners
Starting January 1, 2026, a SECURE 2.0 provision requires catch-up contributions to be made on a Roth (after-tax) basis for participants who earned more than $150,000 in FICA wages from the plan sponsor in the prior year (2025). The $150,000 threshold is the inflation-indexed figure for 2026, up from the statutory base of $145,000.
If your plan does not offer a Roth option, high-earning participants cannot make catch-up contributions at all. The regular $24,500 limit can still be contributed on a pre-tax basis. Only the catch-up portion must go into Roth.
The Employer Match
The employer match is the most important feature of a 401(k). It represents an immediate, guaranteed return on your investment. No other investment reliably delivers a 50% to 100% return on day one.
A common match formula: 100% of contributions up to 3% of salary, plus 50% of contributions from 3% to 5% of salary.
| Your Salary | Your Contribution | Match Calculation | Employer Match | Total Annual |
|---|---|---|---|---|
| $50,000 | 5% = $2,500 | 100% of first 3% ($1,500) + 50% of next 2% ($500) | $2,000 | $4,500 |
| $75,000 | 6% = $4,500 | 100% of first 3% ($2,250) + 50% of next 3% ($1,125) | $3,375 | $7,875 |
| $100,000 | 5% = $5,000 | 100% of first 3% ($3,000) + 50% of next 2% ($1,000) | $4,000 | $9,000 |
Always contribute at least enough to get the full employer match. Failing to do so means leaving a portion of your compensation on the table.
Vesting Schedules
Employer match contributions may not be immediately yours. Most employers use a vesting schedule:
| Vesting Type | Year 1 | Year 2 | Year 3 | Year 4 | Year 5 | Year 6 |
|---|---|---|---|---|---|---|
| Immediate | 100% | 100% | 100% | 100% | 100% | 100% |
| Cliff (3-year) | 0% | 0% | 100% | 100% | 100% | 100% |
| Graded (6-year) | 0% | 20% | 40% | 60% | 80% | 100% |
Your own contributions are always 100% vested immediately. The vesting schedule only applies to employer contributions. Leaving a job before you are fully vested means forfeiting unvested employer money.
Traditional 401(k) vs. Roth 401(k)
Many employers now offer both options:
| Feature | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Contributions | Pre-tax (reduces taxable income now) | After-tax (no current tax break) |
| Investment growth | Tax-deferred | Tax-free |
| Withdrawals in retirement | Taxed as ordinary income | Tax-free (if rules met) |
| RMDs | Yes, starting at age 73 | No (eliminated under SECURE 2.0) |
| Best if you expect taxes to be | Lower in retirement | Higher in retirement |
If you are early in your career and in a low tax bracket, the Roth 401(k) is usually the better choice. If you are a high earner in your peak earning years, the traditional pre-tax option gives you a bigger tax break now. You can also split contributions between both.
Investment Options
Most 401(k) plans offer a limited menu of investment options:
| Investment Type | Risk Level | Expected Long-Term Return | Best For |
|---|---|---|---|
| Money market / stable value | Very low | 4% to 5% | Capital preservation |
| Bond fund | Low to medium | 3% to 5% | Income and stability |
| Balanced fund | Medium | 5% to 7% | Moderate growth |
| Large-cap stock index fund | Medium | 8% to 10% | Core long-term growth |
| Small-cap stock fund | Medium to high | 9% to 11% | Aggressive growth |
| Target-date fund | Varies by date | 6% to 8% | Set-and-forget simplicity |
Target-date funds are the simplest option: pick the fund closest to your expected retirement year (such as "Target 2060 Fund") and it automatically shifts toward more conservative investments as you approach retirement. Pay attention to the expense ratio of whatever you choose, since fees compound into large differences over 30 years.
Withdrawals, Loans, and RMDs
Early Withdrawals (Before Age 59.5)
Withdrawing before age 59.5 triggers a 10% penalty on top of ordinary income tax. On a $20,000 withdrawal at a 22% tax rate:
- Income tax: $4,400
- Early withdrawal penalty: $2,000
- Total cost: $6,400 (32% of the withdrawal)
Exceptions to the penalty include disability, certain medical expenses, substantially equal periodic payments (SEPP/72(t)), and qualified first-time home purchases (Roth 401(k) only).
401(k) Loans
Most plans allow loans of up to 50% of your vested balance or $50,000, whichever is less. You repay the loan with interest to your own account over up to 5 years (longer for a primary home purchase). The risk: if you leave your job, the loan may become due immediately. If you cannot repay it, the outstanding balance is treated as a taxable distribution with the 10% penalty if you are under 59.5.
Required Minimum Distributions
Starting at age 73, the IRS requires you to begin taking RMDs from a traditional 401(k). The RMD amount is calculated by dividing your account balance by a life expectancy factor from IRS tables. Roth 401(k)s eliminated RMDs starting in 2024 under SECURE 2.0.
Real-World Examples
Example 1: The Cost of Not Contributing
Two colleagues, both age 25, both earning $65,000:
| Alex (contributes 6%) | Jordan (contributes nothing) | |
|---|---|---|
| Annual contribution | $3,900 | $0 |
| Employer match (3%) | $1,950 | $0 |
| Total annual investment | $5,850 | $0 |
| At age 65 (7% return) | ~$1,143,000 | $0 |
| Annual retirement income (4% rule) | ~$45,700 | $0 |
Alex contributed $156,000 of her own money over 40 years and received $78,000 in employer match. The combination of matching, tax deferral, and compound growth produced over $1.1 million.
Example 2: Max Contribution at Age 55
Mark is 55 and wants to max out his 401(k) in 2026:
| Item | Amount |
|---|---|
| Regular contribution limit | $24,500 |
| Catch-up contribution (age 50+) | $8,000 |
| Total employee contribution | $32,500 |
| Employer match | $5,000 |
| Total annual contribution | $37,500 |
| Tax savings at 24% bracket (pre-tax portion) | $7,800 |
Mark saves $7,800 in federal income tax by maxing out his pre-tax contributions. His $32,500 contribution costs him about $24,700 in take-home pay after the tax savings.
Key Points to Remember
- The 2026 employee contribution limit is $24,500, or $32,500 with catch-up (age 50+), or $35,750 for ages 60 to 63
- Always contribute at least enough to get the full employer match before investing anywhere else
- The total combined employee and employer limit is $72,000 for 2026
- Starting in 2026, high earners (over $150,000 in prior-year FICA wages) must make catch-up contributions as Roth
- Roth 401(k) contributions grow tax-free and have no RMDs during your lifetime
- Contribution limits reset every January 1; you cannot make up for prior years
- Rolling over to an IRA when you change jobs avoids taxes and penalties
Common Mistakes to Avoid
- Not contributing enough to get the full match: This is the single most costly mistake. You are turning down free money that is part of your total compensation.
- Cashing out when changing jobs: Rolling over to an IRA or your new employer's plan avoids taxes and the 10% early withdrawal penalty. Read our guide on what to do with your 401(k) when you leave a job.
- Leaving money in the default fund: Many plans default new enrollees into a money market or stable value fund. Over decades, the low returns destroy your retirement outcome. Choose appropriate investments.
- Borrowing from your 401(k): Loans interrupt compounding and create tax risk if you leave your job. The outstanding balance becomes a taxable distribution if you cannot repay it.
- Not increasing contributions after raises: Automate contribution increases each year. Even a 1% increase per year can add hundreds of thousands of dollars over a career.
- Ignoring the Roth catch-up rule: If you earned over $150,000 in 2025 FICA wages, your 2026 catch-up contributions must go into a Roth account. Check with your plan administrator to ensure compliance.
Related Concepts
The 401(k) plan connects to many areas of retirement and investing. Similar employer plans include the 403(b) for non-profit employees and the 457(b) for government workers. You can also contribute to an IRA or Roth IRA alongside your 401(k). Employer match contributions may be subject to vesting schedules that determine when the money is yours. Traditional 401(k)s require RMDs starting at age 73, while Roth 401(k)s do not. Many plans offer target-date funds as a simple investment option. To estimate your retirement savings, use our 401(k) calculator or retirement number calculator. For guidance on getting started, read what is a 401(k) and how does it work or should you contribute to a 401(k) at your first job.
Frequently Asked Questions
Q: What happens to my 401(k) if my employer goes bankrupt? A: Your 401(k) assets are held in a trust that is legally separate from your employer's business assets. If your employer goes bankrupt, creditors cannot touch your 401(k) balance. The money belongs to you regardless of what happens to the company.
Q: Can I contribute to both a 401(k) and an IRA? A: Yes. You can max out a 401(k) and also contribute to a Roth IRA or traditional IRA in the same year. The 2026 IRA limit is $7,500 ($8,600 if age 50+). Traditional IRA deductibility may phase out based on your income if you are covered by a workplace plan, but Roth IRA contributions are allowed at higher income levels or through the backdoor method.
Q: Should I choose traditional or Roth 401(k) contributions? A: If you expect to be in a lower tax bracket in retirement, choose traditional (pre-tax) to get the deduction now. If you expect to be in a higher bracket in retirement, or if you are early in your career with a low salary, choose Roth. Many people benefit from splitting contributions between both to diversify their tax situation.
Q: Can I roll my 401(k) into an IRA without paying taxes? A: Yes. A direct rollover from your 401(k) to a traditional IRA is not a taxable event. The money moves directly from the plan to the IRA without you touching it. If you receive a check made out to you, you have 60 days to deposit it into an IRA to avoid taxes and penalties. Always request a direct trustee-to-trustee transfer to avoid mistakes.
Q: What is the maximum I can contribute to my 401(k) in 2026 if I am 62? A: If you are age 60, 61, 62, or 63 in 2026, you qualify for the enhanced catch-up under SECURE 2.0. Your total limit is $35,750 ($24,500 regular + $11,250 enhanced catch-up). If your employer also contributes, the total combined limit is $83,250. Note that if you earned over $150,000 in FICA wages in 2025, your catch-up portion must be designated as Roth.
