Free 401(k) Contribution Calculator

Estimate your 401(k) balance at retirement including employer match, tax savings, and year-by-year growth.

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401(k) Details

Enter your 401(k) details to see your projected retirement balance.

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How Does a 401(k) Work?

A 401(k) is an employer-sponsored retirement savings plan in the United States, named after the section of the Internal Revenue Code that governs it. Employees contribute a percentage of their pre-tax salary directly into the account, reducing their taxable income in the contribution year. The contributions and investment gains grow tax-deferred until withdrawal, at which point ordinary income tax applies. A Roth 401(k) variant accepts after-tax contributions but allows tax-free withdrawals in retirement.

The mechanics are straightforward: each pay period, your employer deducts your chosen contribution percentage from your paycheck before taxes. That money is invested in a menu of mutual funds, index funds, target-date funds, and other options selected by your employer's plan. Because contributions are pre-tax, a $500 monthly contribution costs you only $390 in take-home pay if you are in the 22% tax bracket — the government effectively subsidizes your retirement savings.

Employer Matching — Free Money You Should Never Leave Behind

Employer matching is the most powerful feature of a 401(k) plan. A common match structure is 50% of employee contributions up to 6% of salary. This means: if you earn $85,000 and contribute 6% ($5,100), your employer adds 50% of that ($2,550) to your account — for free. That is an instant 50% return on your contributions before a single investment gain occurs. No other legitimate investment offers this kind of guaranteed return.

Match structures vary significantly by employer. Some offer 100% match up to 3% (dollar-for-dollar). Others offer 50% match up to 8%. Some have no match at all. Always contribute at least enough to capture the full employer match before allocating savings anywhere else. Failing to do so is equivalent to turning down a portion of your compensation.

401(k) Contribution Limits for 2025

For 2025, the IRS has set the following 401(k) contribution limits:

  • Employee contribution limit: $23,500 per year
  • Total combined limit (employee + employer): $70,000 per year
  • Catch-up contribution (age 50–59 and 64+): Additional $7,500 per year
  • Special catch-up (age 60–63): Additional $11,250 per year under SECURE 2.0 provisions

These limits are indexed to inflation and typically increase slightly each year. Maxing out your 401(k) is an excellent financial goal — at $23,500 per year invested at 7% for 30 years, the account would grow to approximately $2.3 million, assuming no employer match. Add employer matching and the growth is even more dramatic.

Investment Strategy Inside Your 401(k)

The investments available in your 401(k) depend on your employer's plan, but most include a mix of stock index funds, bond funds, and target-date funds. Target-date funds (e.g., a "2055 Fund" for someone planning to retire around 2055) automatically shift from growth-oriented (equity-heavy) to more conservative (bond-heavy) allocations as the target date approaches — a simple, hands-off approach suitable for many investors.

For long-term growth projections like this calculator, a 7% annual return assumption reflects a common planning figure for a diversified 60/40 stock-bond portfolio in real (inflation-adjusted) terms. More aggressive equity-heavy portfolios have historically returned 8–10% nominally over very long periods, though with more short-term volatility.

Frequently Asked Questions

Financial advisors generally recommend contributing at least enough to capture your full employer match, then increasing to 15% of gross income (including the employer match) when possible. If you cannot reach 15% immediately, many plans offer auto-escalation — automatically increasing your contribution by 1% each year. Even small annual increases compound meaningfully over a multi-decade career.

The traditional 401(k) gives you a tax break now (contributions are pre-tax) but you pay taxes on withdrawals in retirement. The Roth 401(k) uses after-tax contributions but grows tax-free — withdrawals in retirement are completely tax-free. As a general rule: if you expect to be in a higher tax bracket in retirement than you are now, the Roth is better. If you expect lower taxes in retirement, traditional wins. Most financial advisors suggest a mix of both to hedge against future tax uncertainty. Young workers with lower incomes often benefit more from Roth contributions.

When you leave a job, you have several options for your 401(k): roll it into your new employer's 401(k) plan, roll it into an IRA (giving you more investment choices and potentially lower fees), leave it with your former employer (usually possible if the balance is above $5,000), or cash it out (generally a bad choice — you pay income tax plus a 10% early withdrawal penalty if under age 59½). A direct rollover to an IRA is usually the most flexible and cost-effective option.

Vesting determines when employer matching contributions become fully yours. Your own contributions are always 100% vested immediately. Employer matches may vest on a cliff schedule (e.g., 100% after 3 years of service) or a graded schedule (e.g., 20% per year over 5 years). If you leave before fully vesting, you forfeit some or all of the employer contributions. This calculator assumes you remain employed and fully vested throughout the contribution period.

You can take penalty-free withdrawals from a traditional 401(k) starting at age 59½. Withdrawals before that age incur a 10% early withdrawal penalty plus ordinary income tax, with limited exceptions (certain hardships, disability, substantially equal periodic payments under Rule 72(t), and others). Required Minimum Distributions (RMDs) must begin at age 73 under current law. Roth 401(k) withdrawals in retirement are tax-free but still subject to the 59½ age rule for penalty-free access to earnings.

Yes, if you can afford to. The IRA contribution limit for 2025 is $7,000 ($8,000 if age 50+). A Roth IRA offers tax-free growth with no required minimum distributions and more flexible investment options than most 401(k) plans. The recommended order is: (1) contribute to 401(k) up to employer match; (2) max out a Roth IRA; (3) max out the 401(k); (4) invest additional funds in taxable accounts. This sequence maximizes tax-advantaged space before moving to taxable investing.

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