403(b) Contribution Calculator

Set annual salary, your current contribution rate, and the rate you want to test. Enter the federal bracket and state rate used for the simplified tax estimate, the number of pay periods per year, and the employer match rate. Select the 15-year eligibility option only if your plan administrator has confirmed it applies.

The calculator estimates employee contributions as a percentage of salary, subject to its employee limit. It estimates the employer contribution separately as a percentage of salary. Its employer field does not reproduce every employer match formula, such as a match that applies only to contributions up to a certain salary percentage. For broader account growth, try the 403(b) Calculator.

At $65,000 salary:

• $65,000 × 6% = $3,900 current annual contribution.
• $65,000 × 12% = $7,800 proposed annual contribution.
• $7,800 − $3,900 = $3,900 additional annual saving.
• 22% + 5% = 27% combined assumed tax rate.
• $3,900 × 27% = $1,053 estimated annual tax savings.
• $3,900 − $1,053 = $2,847 estimated after-tax cost of the additional contribution.
• $2,847 ÷ 24 = $118.625, rounded to $119 per paycheck.

The current employer contribution is $65,000 × 5% = $3,250. The proposed employer contribution is also $3,250, because the calculator applies the same 5% of salary in both cases. The modeled annual take-home values are $44,603 at the current rate and $41,756 at the proposed rate.

These outputs are estimates, not a payroll forecast. Real withholding can differ because payroll taxes, benefit deductions, tax credits, and federal and state tax calculations are not fully modeled.

The 2026 employee elective deferral limit for 403(b) plans is $24,500. Eligible participants age 50 or older may generally make an additional $8,000 catch-up contribution. Those age 60 through 63 may be eligible for the SECURE 2.0 super catch-up of $11,250. Contribution limits can change annually; see the IRS’s retirement plan contribution limits.

Certain employees with 15 years of service at an eligible 403(b) employer may qualify for a special additional catch-up, commonly up to $3,000 per year subject to lifetime and prior-contribution limits. The calculator’s eligibility toggle adds the modeled 15-year allowance to its cap, but it does not confirm your eligibility. Ask your plan administrator to determine the exact amount. See the IRS 403(b) plan guidance.

The tax-savings estimate applies the combined federal and state rates to the difference in contributions. It does not calculate tax brackets dollar by dollar or model whether your contribution reduces eligibility for an income-based credit or changes other taxes. Traditional contributions generally reduce current federal taxable income; Roth 403(b) contributions are generally made after tax. Compare the Roth 403(b) Calculator if you are evaluating that tradeoff.

Annual contribution = annual salary × contribution rate

Estimated annual tax savings = (proposed contribution − current contribution) × (federal tax bracket + state tax rate)

Estimated paycheck reduction = [(salary − current contribution) × (1 − combined tax rate) − (salary − proposed contribution) × (1 − combined tax rate)] ÷ pay periods

Employer contribution = annual salary × employer match rate

The paycheck formula models a tax effect on income after the employee contribution. It does not mean that the contribution is a tax credit: a traditional 403(b) contribution is generally a deduction or exclusion from current taxable income, not a dollar-for-dollar tax reduction.

The comparison below uses the default $65,000 salary, 27% combined tax assumption, and $3,250 employer contribution. Take-home pay is the calculator’s modeled annual amount; “net pay change” compares each row with the current 6% contribution.

The comparison table’s tax-savings column applies the combined rate to each row’s full contribution, while the headline annual tax-savings result applies it to the increase from 6% to 12%. That is why the table’s 12% value of $2,106 differs from the headline’s $1,053 incremental estimate. Use the incremental calculation to compare the proposed rate with your current rate.

If the employer matches only up to a set contribution level, make sure your selected contribution captures the full match before comparing additional savings. Use the 403(b) contribution growth calculator for projected balances, the 401(k) Contribution Calculator for a workplace-plan comparison, or the TSP Contribution Calculator for federal employee savings.

Does increasing my 403(b) contribution reduce take-home pay by the full contribution?

Usually not for traditional pre-tax contributions, because the contribution can reduce current taxable income. The exact paycheck effect depends on your tax situation, payroll deductions, and withholding. This calculator uses a simplified combined tax rate.

Is the 403(b) employer match included in the employee contribution limit?

Employer contributions are not the same as employee salary deferrals, although a separate overall annual additions limit can apply. Plan terms determine the actual match. Review your plan documents and the IRS 403(b) rules.

Should I contribute enough to get the match or pay off debt first?

A full employer match can add compensation to your retirement account, but high-interest debt has a guaranteed cost that may outweigh uncertain investment returns. Compare the interest rate, cash reserve, match formula, and repayment timeline rather than choosing based on the contribution rate alone.

Are Roth 403(b) contributions included in the calculator?

The calculator’s tax savings assume contributions lower current taxable income, which corresponds to a traditional pre-tax contribution. Roth contributions generally do not reduce current federal taxable income, so the modeled tax savings and take-home effect would not apply in the same way.

Does qualifying for the 15-year catch-up mean I can always add $3,000?

No. The special catch-up has service and prior-deferral rules, including a lifetime limit. The calculator’s toggle does not check your records or establish the permitted amount. Ask your plan administrator to calculate it.

How much should I contribute per paycheck?

Choose a sustainable amount that captures any valuable match while leaving enough cash for essential spending, debt payments, and emergency savings. Test a few contribution rates in the table and verify the actual paycheck change with payroll.

Confirm the match formula and applicable catch-up eligibility with your plan administrator. Then test a rate increase that fits your monthly budget and revisit it after pay increases. For long-term effects, use the 403(b) Calculator and review retirement withdrawal implications with the 403(b) Withdrawal Calculator.

If you are comparing account types, review the Roth 401(k) Contribution Calculator and consider how contribution choices affect future required distributions. The IRS explains required minimum distributions, and our guide covers RMD strategies to minimize the tax hit.