How much should I contribute to my 401(k)?

At minimum, contribute enough to capture the full employer match — that's an immediate 50–100% return on your contribution. Beyond that, aim for 10–15% of gross salary total (including employer match). The 2026 employee limit is $24,500 (under 50) or $32,500 (50+).

What is employer matching and how does it work?

Most employers match a percentage of your contribution up to a cap. A "50% match up to 6%" means if you contribute 6% of salary, the employer adds 3%. On a $75,000 salary, that's $2,250 in free money per year. Always contribute at least enough to capture the full match.

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

Employee contribution limit for 2026: $24,500 for those under 50, $32,500 for those aged 50–59 or 64+, and $35,750 for those aged 60–63 (catch-up). Total combined (employee + employer) cannot exceed $72,000.

Traditional 401(k) vs Roth 401(k) — which is better?

Traditional 401(k) contributions are pre-tax (reduce income now, taxed on withdrawal). Roth 401(k) contributions are after-tax (no tax break now, but withdrawals in retirement are tax-free). Generally: choose Traditional if you expect to be in a lower tax bracket in retirement; choose Roth if you expect to be in a higher bracket or are early in your career.

What is the 401(k) early withdrawal penalty?

Withdrawals before age 59½ incur a 10% penalty plus ordinary income tax on the amount. On a $50,000 withdrawal for someone in the 22% bracket, that's $16,000 in taxes and penalties — leaving only $34,000. Exceptions exist for hardship, disability, and certain medical expenses.

How much will my 401(k) grow over time?

A 35-year-old with $25,000 saved, contributing 10% of a $75,000 salary with a 50% match up to 6%, expecting 7% annual returns, would accumulate approximately $1.1M by age 65 — a powerful illustration of compounding over 30 years.

401k Calculator — Balance & Retirement

Estimates 401(k) balance at retirement based on salary, contribution rate, employer match, and investment return.

How to Use This 401k Calculator

This 401k calculator runs a year-by-year projection of your retirement balance from your current age to retirement. Enter your current age, retirement age, and annual salary to get started. Then set your employee contribution percentage, employer match rate, and the match cap (the percentage of salary your employer will match up to). Add your current 401(k) balance, expected annual return, and salary growth rate. The calculator applies IRS contribution limits, employer match, and compounding to show your balance at retirement, estimated monthly income, and the breakdown between your contributions, your employer's contributions, and investment growth. Use the share button to save your scenario as a URL.

To compare a 401(k) with an IRA alongside your savings plan, use our IRA calculator to see how both accounts can work together.

How 401(k) Compounding Works

A 401(k) grows through the compounding of investment returns on every dollar in the account — your contributions, your employer's match, and all previously earned gains. Each year, the entire balance earns a return, not just new contributions. This is why starting early matters so much: a dollar invested at 35 has 30 years to compound; a dollar invested at 55 has only 10.

The formula used here applies contributions at the end of each year:

Balance_next = Balance × (1 + r) + Employee Contribution + Employer Contribution

Where r = annual return rate (e.g. 0.07 for 7%). Salary grows each year by the salary increase percentage, and contributions are recalculated accordingly. IRS limits are checked each year based on your age in that year.

AdvertisementResponsive Ad

Maximizing Your Employer Match

Employer matching is the closest thing to free money in personal finance. If your employer offers a 50% match up to 6% of salary and you earn $75,000, contributing 6% ($4,500) gets you an extra $2,250 per year from your employer — a 50% instant return before any market gains. Over 30 years at 7%, that $2,250/year employer contribution alone compounds to approximately $227,000.

Always contribute at least enough to capture the full employer match before directing money to any other savings vehicle. If your employer has a vesting schedule, check when the matched funds become fully yours — typically 3–6 years.

2026 401(k) Contribution Limits

The IRS sets annual limits on how much you can contribute to a 401(k):

Under age 50: $24,500
Ages 50–59 or 64+: $32,500 (includes catch-up contribution)
Ages 60–63: $35,750 (enhanced catch-up under SECURE 2.0)
Total combined (employee + employer): $72,000

These limits are for employee elective deferrals only. Employer contributions count toward the combined limit but not the employee limit. If you change jobs mid-year, the employee limit applies across all 401(k) plans combined.

Traditional vs. Roth 401(k)

Both options grow tax-deferred, but differ on when you pay taxes:

Traditional 401(k): Contributions are pre-tax — they reduce your taxable income today. Withdrawals in retirement are taxed as ordinary income. Best if you expect a lower tax rate in retirement.
Roth 401(k): Contributions are after-tax — no deduction today. Qualified withdrawals in retirement are completely tax-free, including all growth. Best if you expect a higher tax rate in retirement or want tax-free income later.

Many advisors recommend splitting contributions between both for tax diversification — giving you flexibility to draw from whichever account is more tax-efficient each year in retirement.

AdvertisementResponsive Ad

The Impact of Starting Early

Consider two savers both targeting retirement at 65 with a 7% annual return:

Alex starts at 25 — contributes $6,000/year for 40 years. Total contributions: $240,000. Balance at 65: approximately $1.28 million.
Sam starts at 35 — contributes $6,000/year for 30 years. Total contributions: $180,000. Balance at 65: approximately $606,000.

Alex contributed $60,000 more but ended up with more than double Sam's balance. The extra 10 years of compounding — not the extra contributions — account for most of the difference. This is why the best time to start a 401(k) is the day you become eligible.

401(k) in the Three-Part Retirement System

Financial planners often describe retirement income as a three-legged stool: Social Security, employer pension (if any), and personal savings (401(k) / IRA). Most Americans today rely heavily on personal savings because traditional pensions are rare outside government jobs.

The recommended priority order for retirement savings:

401(k) up to the employer match
IRA (Roth or Traditional) — use our Coast FIRE calculator to see when you can stop contributing
401(k) up to the annual maximum
Taxable brokerage account for savings beyond tax-advantaged limits

A 401(k) is not a substitute for an emergency fund. Keep 3–6 months of expenses in liquid savings before maximizing retirement contributions.

Financial Disclaimer

This calculator is for planning and educational purposes only. It is not financial advice. Investment returns are not guaranteed — markets can and do underperform projections. 401(k) contribution limits, employer match terms, tax rules, and IRS catch-up provisions are subject to change. The 4% withdrawal rule is a guideline, not a guarantee of sustainable income. Consult a qualified financial advisor before making retirement savings decisions.

401(k) Calculator