Free calculator • Instant results • For illustration purposes only

Could your 401(k) actually increase your take-home pay?

See how contributing to your 401(k) could lower your taxes and potentially drop you into a lower tax bracket.

This calculator helps show how pre-tax contributions may reduce taxable income, affect estimated taxes, unlock employer match, and build long-term retirement savings. Try different contribution amounts and see what changes.

See your estimated tax impact
Check potential bracket changes
Visualize long-term growth
Approx. % of salary needed to drop a tax bracket
0.0%
estimated threshold
Your annual contribution
$0
pre-tax contribution
Estimated tax savings
$0
federal + state
Employer match
$0
estimated added value
Projected 40-year balance
$0
assuming 7% average return
Calculator inputs
Top bracket
0.0% → 0.0%
Taxable income after
$0
Estimated annual net cost
$0
Total annual retirement add
$0
Your estimated results
Standard deduction used
$0
Federal tax before
$0
Federal tax after
$0
State tax rate
0.0%
State tax before
$0
State tax after
$0
Shareable summary
By contributing to your 401(k), your taxable income may decrease enough to improve your overall tax efficiency.
This is a simplified educational estimate only. It models ordinary federal income tax, estimated state tax, pre-tax traditional 401(k) contributions, company match, and optional W-4 extra withholding.
Why this exists
I once got a raise and my take-home pay barely changed. That did not feel right, so I built this calculator to better understand how taxes and pre-tax 401(k) contributions can affect the outcome. Sometimes a contribution can lower taxable income enough to make a bigger difference than people expect.
How it works
Simple version:

• Traditional 401(k) contributions are generally made pre-tax
• Pre-tax contributions may reduce taxable income
• Lower taxable income may change your top tax bracket
• Employer match can increase the amount going toward retirement
• This tool gives a quick estimate so you can compare scenarios
Sample paystub
Line ItemBefore 401(k)After 401(k)Change
1% to 10% scenarios
RateAnnual ContributionTop BracketDrops Bracket?Employer MatchFed Tax SavingsState Tax SavingsNet Annual Cost
40-year balance
YearAnnual AddNo GrowthGrowthEnding Balance
Important note
Try different contribution amounts to see how your results change. You might be surprised what a small adjustment can do.
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Disclaimer
This website and calculator are provided for illustrative and educational purposes only and do not constitute tax, legal, or financial advice. Results are estimates based on simplified assumptions and may not reflect your actual tax situation. Please consult a qualified tax, legal, or financial professional before making any decisions. By using this tool, you agree that the creator is not responsible for decisions or outcomes resulting from its use.