401k Contribution Calculator
Estimate your future 401(k) retirement balance and analyze company matching contributions.
The Mathematical Formula
Variable & Parameter Definitions
- Employee Elective Deferral Voluntary salary reduction contributions up to statutory limit ($24,500 for Tax Year 2026).
- Match Cap % The maximum salary percentage the employer agrees to match (e.g. up to 6% of salary).
- Match Rate The matching ratio provided by the employer (e.g. 50% or 100% on the dollar).
- Total 401(k) Addition Combined pre-tax annual contributions compounding in the employee 401(k) account.
Real-World Worked Scenario: $95,000 Salary with 50% Match up to 6%
An employee earning $95,000 contributes 8% of salary ($7,600) into their traditional 401(k). Their company matches 50 cents on the dollar up to 6% of salary.
- Matched Employee Deferral: min(8%, 6%) × $95,000 = $5,700 eligible for match.
- Employer Match Addition: $5,700 × 50% = $2,850 free employer contribution.
- Unmatched Employee Deferral: (8% - 6%) × $95,000 = $1,900.
- Total Annual 401(k) Inflow: $7,600 (employee) + $2,850 (employer) = $10,450.
- Over 25 years compounding at 7.5% annual return, this generates approximately $782,000 in retirement assets.
Strategic Insights & Pitfalls to Avoid
- ✓ Vest Schedule Warning: Check your employer vesting schedule; leaving a company before vesting forfeits unvested employer contributions.
- ✓ Auto-Escalation: Enable 1% annual contribution escalations so raises automatically boost your retirement savings rate.
- ✓ Total Section 415(c) Limit: In 2026, total employee + employer matching contributions cannot exceed $71,000.
Frequently Asked Questions
What is the maximum 401(k) contribution for 2026?
For Tax Year 2026, the IRS employee elective deferral limit is $24,500. Age 50+ catch-up is $8,000 ($32,500 total), and ages 60–63 have an enhanced catch-up of $11,250 ($35,750 total).
Does the employer match count toward the $24,500 employee limit?
No. Employer matching contributions count toward the broader overall 415(c) limit ($71,000 for 2026), not the $24,500 employee elective limit.
What is the difference between Traditional 401(k) and Roth 401(k)?
Traditional 401(k) contributions reduce taxable income today and are taxed upon withdrawal. Roth 401(k) contributions are after-tax and grow 100% tax-free with zero taxes upon qualified retirement withdrawal.