How to Use the 401(k) Calculator 2026
The 401(k) Calculator projects your retirement balance based on your contributions, employer match, expected investment return, and time to retirement. It models both traditional (pre-tax) and Roth (after-tax) contributions and shows the significant impact of employer matching on your long-term wealth.
Enter your current age, salary, contribution percentage, employer match (percentage and cap), expected return, and planned retirement age. The calculator shows year-by-year balance growth, total contributions vs investment growth, and the retirement income your balance can support.
A critical nuance: always contribute at least enough to capture your full employer match — it's a 50–100% instant return on that portion of your contribution. A 50% match on the first 6% of salary (common structure) means a $1,000 contribution gets you $500 from your employer immediately, before any investment return.
📊 Worked Example
Age 30, $70,000 salary, 10% contribution, 50% employer match on first 6%, 7% return, retiring at 65:
- Your contribution: $7,000/year
- Employer match: $2,100/year (50% of first 6% = 3% of $70k)
- Total contributions (35 yrs): $317,500
- Investment growth: $979,000
- Balance at 65: $1,296,500
Common Use Cases
- ✅ Projecting your 401(k) balance at retirement age
- ✅ Understanding how employer matching accelerates growth
- ✅ Comparing traditional vs Roth 401(k) tax treatment
- ✅ Calculating the retirement income your savings will support
- ✅ Finding the contribution rate needed to hit a retirement goal
- ✅ Modeling the impact of increasing contributions by 1–2%
Frequently Asked Questions
What is the 401(k) contribution limit for 2026?
Employee contributions are limited to $23,500 in 2025 (projected ~$24,000 for 2026, pending IRS announcement). Workers aged 50+ can make additional catch-up contributions of $7,500 (those 60–63 have an enhanced catch-up of $11,250 from 2025). Total employer + employee limit is $70,000 in 2025.
What is the difference between traditional and Roth 401(k)?
Traditional 401(k): contributions are pre-tax, reducing your taxable income now. Withdrawals in retirement are taxed as ordinary income. Roth 401(k): contributions are post-tax (no current deduction), but qualified withdrawals in retirement are completely tax-free. Generally, choose traditional if you expect lower taxes in retirement; Roth if you expect higher taxes.
What happens to my 401(k) if I change jobs?
You have several options: roll it over to your new employer's 401(k), roll it over to an IRA, cash out (not recommended — triggers income tax and a 10% early withdrawal penalty if under 59½), or leave it in your old employer's plan (if allowed). Rolling to an IRA gives you the most investment options.
When can I withdraw from my 401(k) without penalty?
The standard rule: no penalty withdrawals after age 59½. For those who separate from service at age 55 or older, the age is 55 (the 'rule of 55'). Required minimum distributions (RMDs) begin at age 73. Early withdrawals before 59½ incur a 10% penalty plus income tax, with exceptions for hardship, disability, and certain other circumstances.
Is my 401(k) money safe if my employer goes bankrupt?
Yes. 401(k) assets are held in a separate trust from your employer's assets and are protected under ERISA. If your employer goes bankrupt, your 401(k) balance is not at risk from creditors. The plan assets are legally yours. Simply roll them to an IRA or a new employer's plan.