401(k) Contribution Calculator

How to Use the 401(k) Contribution Calculator

1. Enter your annual salary — Input your gross annual income before taxes or any deductions.
2. Enter your contribution percentage — Input the percentage of your salary you currently contribute or plan to contribute to your 401(k) each pay period.
3. Enter your employer match — Input your employer’s match rate and the salary percentage cap on that match. For example, a 50% match up to 6% of salary is a common structure.
4. Enter your current 401(k) balance — If you already have savings in the account, input that amount so the calculator can project growth from your existing balance forward.
5. Enter your expected rate of return and years until retirement — Use a conservative 6–7% annual return for a diversified portfolio, and input how many years remain until your target retirement age.
6. Click Calculate — The tool displays your annual contribution, your employer’s annual match, your total projected balance at retirement, and the tax savings generated by contributing pre-tax dollars.

How the 401(k) Contribution Calculator Works

The 401(k) is the most powerful wealth-building tool available to most American workers — yet the majority of people who have access to one are either not contributing enough to capture the full employer match or have no clear picture of what their current contribution rate will produce at retirement. This calculator translates your contribution decisions into concrete long-term outcomes so you can make informed choices rather than guessing.

How a 401(k) Reduces Your Tax Bill Today

Traditional 401(k) contributions are made with pre-tax dollars, meaning every dollar you contribute reduces your taxable income by one dollar in the year you contribute it. If you’re in the 22% federal tax bracket and contribute $6,000 to your 401(k), you reduce your federal tax bill by $1,320. Effectively, that $6,000 contribution only costs you $4,680 out of pocket — the government funds the rest through the tax reduction. This tax advantage makes 401(k) contributions significantly more efficient than saving the same amount in an after-tax account.

The Employer Match: Your Highest-Return Investment

An employer 401(k) match is free money with an immediate 50–100% return before a single dollar of investment growth occurs. A common match structure — 100% of contributions up to 3% of salary — means an employee earning $65,000 who contributes 3% ($1,950) receives an additional $1,950 from their employer, doubling the contribution instantly. Not contributing enough to capture the full match is the most costly financial mistake a working person can make. No investment, savings account, or debt payoff strategy produces a guaranteed 50–100% return on day one.

2026 IRS Contribution Limits

The IRS sets annual limits on how much you can contribute to a 401(k). For 2026, the employee contribution limit increases to $24,500 — up $1,000 from 2025. Workers aged 50 and older can make an additional catch-up contribution of $8,000, bringing their total to $32,500. Workers aged 60 through 63 qualify for an even higher “super catch-up” limit of $11,250 instead of the standard $8,000, allowing a total contribution of up to $35,750. The combined limit including employer contributions rises to $72,000 for 2026 ($80,000 including catch-up contributions, or up to $83,250 for those aged 60–63). Contributing up to the IRS limit is a meaningful tax planning strategy for higher earners, particularly in peak earning years.

New for 2026: Mandatory Roth Catch-Up for High Earners

A significant change takes effect in 2026 under the SECURE 2.0 Act: workers aged 50 and older who earned more than $150,000 in FICA wages during the prior year must make their catch-up contributions on a Roth (after-tax) basis rather than pre-tax. This means high earners lose the upfront tax deduction on the catch-up portion of their contribution, though they still benefit from tax-free growth and tax-free withdrawals in retirement on that money. If your plan doesn’t currently offer a Roth 401(k) option and you’re affected by this rule, you won’t be able to make catch-up contributions at all until your plan adds one — worth checking with your HR department or plan administrator now if you’re approaching this threshold.

Traditional 401(k) vs. Roth 401(k)

Many employers now offer both a traditional 401(k) and a Roth 401(k) option. The key difference is when you pay taxes. Traditional 401(k) contributions are pre-tax — you save on taxes now and pay them in retirement when you withdraw. Roth 401(k) contributions are after-tax — you pay taxes now, but qualified withdrawals in retirement are completely tax-free. The right choice depends on whether you expect to be in a higher or lower tax bracket in retirement. Younger workers early in their careers often benefit more from the Roth option; higher earners in peak earning years typically benefit more from the traditional pre-tax approach — though the new 2026 mandatory Roth catch-up rule means high earners 50 and older no longer have full control over this choice for the catch-up portion of their contributions.

The Long-Term Impact of Contribution Rate on Retirement Balance

Small differences in contribution rate produce enormous differences in retirement balance over a 30–40 year career. An employee earning $60,000 who contributes 6% ($3,600/year) versus 10% ($6,000/year) creates an annual gap of $2,400 in contributions. Over 35 years at a 7% average annual return, that difference compounds to over $330,000 in additional retirement savings. The earlier a contribution rate increase happens, the more dramatic the long-term effect — which is why even a 1–2 percentage point increase in your contribution rate in your 20s or 30s has an outsized impact on retirement outcomes.

2026 401(k) Contribution Scenarios by Salary and Rate

The following table shows annual employee contributions, employer match received, and projected 30-year balance at a 7% average annual return for common salary and contribution rate combinations. Employer match assumed at 100% up to 3% of salary.