401(k) Tax Savings Calculator (US)

This 401(k) tax savings calculator estimates how pre-tax 401(k) contributions may reduce taxable income and federal tax. It is useful for seeing the near-term tax effect of contributing more to a workplace retirement plan.

Pre-tax contributions usually reduce current taxable income, but they are not tax-free forever. Withdrawals in retirement are generally taxable, so the decision is about timing, tax rate, employer match, and long-term retirement savings.

If you contribute $8,000 pre-tax and your marginal federal tax rate is 22%, the simplified current-year federal tax saving is about $1,760.

The real benefit may be larger if your employer matches contributions. Missing a match can be more costly than the tax saving itself.

Use the result to compare contribution levels, estimate take-home pay impact, and decide whether increasing contributions is affordable.

Check annual contribution limits, employer plan rules, Roth versus traditional options, payroll timing, and state tax treatment before making final decisions.

Use this calculator to estimate the current federal tax savings from a pre-tax 401(k) contribution using annual income, contribution amount, marginal federal tax rate, employer match rate, and match limit.

The component estimates tax savings, net paycheck cost after tax savings, employer match, total retirement contribution, and taxable income after the contribution.

It does not model IRS annual contribution limits, Roth 401(k), catch-up contributions, payroll timing, state tax, FICA treatment, vesting, plan rules, loans, or future withdrawals.

Use IRA contribution tax for Traditional IRA deduction assumptions instead of payroll-based 401(k) contributions.

Label saved scenarios with contribution amount, marginal rate, match formula, and match limit because those assumptions drive the outcome.

Assuming the tax savings is free money rather than a reduction in current federal tax from pre-tax deferral.

Entering employer match as if it were your contribution. The component calculates match from contribution, match rate, and match limit.

Ignoring IRS contribution limits, catch-up rules, plan vesting, payroll cutoff dates, and employer-specific plan rules.

Using this page for Roth 401(k) contributions. Roth contributions do not create the same current-year pre-tax deduction.

Expecting the calculator to estimate state tax, FICA, paycheck withholding tables, or retirement withdrawal tax.

Example: enter $85,000 annual income, an $8,000 pre-tax 401(k) contribution, a 22% marginal federal tax rate, a 50% employer match rate, and a 6% match limit.

The calculator estimates federal tax savings on the contribution, net cost after tax savings, employer match, and total retirement contribution.

Change the marginal rate separately from the contribution if you are testing paycheck cost versus tax savings.

Change the match rate and match limit together only when your employer formula really changes.

Use IRA contribution tax when the question is a Traditional IRA deduction rather than workplace payroll deferral.

Use federal income tax before this page if you need help choosing a marginal federal rate.

Use payroll tax when the question is pay-period net pay after withholding assumptions.

Use retirement savings for long-term account growth after deciding how much to contribute.

Check annual contribution limits, catch-up eligibility, and plan payroll deadlines for the tax year.

Check the employer match formula and vesting schedule before treating the match as guaranteed value.

Check whether contribution type is pre-tax or Roth, because this page is for pre-tax contribution savings.

Rerun this 401(k) tax savings calculator when income, contribution amount, marginal rate, match rate, or match limit changes.

Recheck after a raise, bonus, employer match change, or open-enrollment contribution change.

If this estimate differs from payroll, trace contribution type, payroll timing, federal rate, state tax, FICA, match formula, and plan limits separately.