401(k) Contribution Optimizer

Payroll & Payslip

Use the 401(k) Contribution Optimizer

See how increasing pre-tax retirement contributions changes take-home pay and tax drag in the United States.

Policy-aware Accessible PDF and Excel

Tax-sheltering visibility
Take-home pay impact
Contribution scenario comparison

Before you calculate

Enter the current pay-period contribution, target rate, filing details, pre-tax benefits, employer plan terms, and year-to-date taxable wages before comparing contribution steps.

What this calculator covers

Inputs you can model

Gross pay per period
Pay cycle
Filing status
State
Current 401(k) contribution %
Target 401(k) contribution %
Contribution step %
Pre-tax medical per period
State allowance count
State personal exemptions

Results you can review

Target net take-home
Net pay reduction
Annual retirement contribution
Estimated annual tax savings
Contribution scenarios

Method, policy basis, and limitations

How the estimate is built

Each scenario applies eligible pre-tax 401(k) deferrals to income-tax withholding while preserving applicable FICA treatment and annual wage-base logic for the selected payroll profile.

Important limitation

This is a payroll and retirement contribution estimate, not tax or plan advice. Plan eligibility, annual limits, employer matching, Roth treatment, payroll timing, and individual tax circumstances may differ.

Your inputs

Enter the values you know. Required fields should be completed first, and optional fields can be left blank if they do not apply to your situation.

Preparing your input checklist Visible required fields are checked as you complete them.

Gross pay per period Required Minimum: 0.00.

Pay cycle Required

Filing status Required

State Required

Current 401(k) contribution % Required Minimum: 0.00.

Target 401(k) contribution % Required Minimum: 0.00.

Contribution step % Required Minimum: 0.10.

Pre-tax medical per period Required Minimum: 0.00.

State allowance count Required Minimum: 0.00.

State personal exemptions Required Minimum: 0.00.

Additional state deduction per period Required Minimum: 0.00.

Social Security wages year to date Optional Optional. Enter Social Security-taxable wages already earned this year so the optimizer applies the annual wage base correctly. Minimum: 0.00.

Medicare wages year to date Optional Optional. Enter Medicare-taxable wages already earned this year so Additional Medicare Tax thresholds are evaluated correctly. Minimum: 0.00.

Calculating and validating policy inputs...

Your decision view will appear here

Run the calculator to see the planning signal, key measures, reconciliation detail, and any schedules or stress scenarios returned for these inputs.

Your results

The top cards show the most important answers first. Detailed schedules, scenario tables, and supporting notes appear underneath for deeper review.

Planning estimate

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