401(k) Tax Savings Calculator
Calculate how much you save in federal taxes by contributing to a traditional 401(k). Pre-tax contributions lower your taxable income.
📅 Tax Year:
Calculate 401(k) Tax Savings
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2026 max: $24,000
Common: 3-6% of salary
How It Works
Traditional 401(k) contributions are made pre-tax, reducing your taxable income for the year.
2026 Contribution Limits
| Category | 2026 Limit |
|---|---|
| Employee Contribution | $24,000 |
| Catch-Up (Age 50+) | $8,000 |
| Total with Catch-Up | $32,000 |
Tax Savings Formula
Tax Savings = Contribution × Marginal Tax Rate
If you're in the 22% bracket and contribute $10,000, you save approximately $2,200 in federal taxes.
Examples
Example: $85k Salary, $15k Contribution
Without 401k: Taxable ~$70,000 → Tax ~$8,000
With 401k: Taxable ~$55,000 → Tax ~$4,700
Savings:
~$3,300
Frequently Asked Questions
Traditional vs Roth 401(k)?
Traditional 401k: pre-tax contributions now, taxed on withdrawal.
Roth 401k: after-tax contributions, tax-free withdrawals. This calculator shows traditional
401k savings.
Does the employer match count toward the limit?
No. The $24,000 limit is for employee contributions only. Employer
matches are separate and don't count toward your individual limit.
When should I choose Roth instead?
If you expect to be in a higher tax bracket in retirement, Roth may
be better. If you're in a high bracket now, traditional provides more immediate tax savings.
What about state taxes?
In most states, 401k contributions also reduce state taxable income.
Your total savings could be higher than shown here.
How does the catch-up contribution work?
If you're 50 or older by year-end, you can contribute an additional
$8,000 (2026), for a total of $32,000.
Is this free money?
You save taxes now, but pay taxes when you withdraw in retirement.
It's tax deferral, not elimination. However, employer match is essentially free money—always
get the full match!
Use Cases
- Determine the federal tax savings of increasing your 401(k) contribution during open enrollment.
- Compare different contribution levels to find the sweet spot between tax savings and take-home pay.
- Calculate the value of your employer match to ensure you are capturing the full benefit.
- Evaluate whether maxing out your 401(k) makes sense based on your current marginal tax bracket.
- Plan catch-up contributions if you are age 50 or older and want to accelerate retirement savings.
Assumptions & Limitations
- This calculator estimates federal income tax savings only; state and local tax reductions are not included.
- Standard deduction is applied automatically; itemized deductions or other above-the-line adjustments are not modeled.
- Employer match is shown for reference but does not affect the tax savings calculation (it is not taxable until withdrawal).
- Contribution limits are based on IRS-published figures for the selected tax year and may change with future guidance.
- This tool does not project long-term growth or retirement income; it focuses on the current-year tax benefit.
- This tool is for educational and planning purposes only and does not constitute tax advice. Consult a qualified tax professional for your specific situation.
Sources & References
- IRS Publication 560 – Retirement Plans for Small Business
- IRS Notice – 401(k) Contribution Limits for 2026
- IRC Section 402(g) – Limitation on Elective Deferrals
- IRS Topic No. 424 – 401(k) Plans
- IRS – 401(k) and Profit-Sharing Plan Contribution Limits
Contribution limits and tax brackets are updated for the 2026 tax year. Always verify current figures on IRS.gov before making financial decisions.