🔹 How 401k Works
A 401(k) is an employer-sponsored retirement account. You contribute pre-tax dollars, investments grow tax-deferred, and many employers match a portion. Our calculator shows the power of compounding over decades.
Tip: Start early — time in market matters.🔹 Employer Match Magic
Employer match is free money. For example, 50% match on first 6% means if you save 6% of salary, employer adds 3%. Always contribute enough to get full match — it instantly boosts your return.
Use sliders to see impact of match.🔹 Contribution Percentage
Experts recommend saving 10-15% of your salary for retirement. Higher contributions accelerate growth. The calculator shows your total contributions vs employer addition vs investment earnings.
Even +1% makes a huge difference over 30 years.🔹 Salary Growth Effect
As your income rises, you contribute more dollars even if percentage stays same. Our model increases salary each year by your expected raise — realistic long-term planning.
Assume 2-4% annual increase for conservative estimates.🔹 Expected Annual Return
Historically, a diversified 401k portfolio (stocks+bonds) averages 7-9% before inflation. Use conservative 6-7% for planning. Higher returns boost final balance exponentially.
Adjust slider to see risk/return tradeoff.🔹 4% Withdrawal Rule
Monthly income estimate is based on the 4% rule: withdraw 4% of your nest egg in first year of retirement, adjusted for inflation thereafter. Provides sustainable income for 30 years.
Example: $500k → $20k/year → ~$1,667/month.
❓ Frequently Asked Questions — 401k & Retirement Planning
What is a 401k calculator and how accurate is it? +
A 401k calculator projects your retirement balance based on current savings, contributions, employer match, investment returns, and salary growth. Accuracy depends on your inputs; actual market returns vary. Use it as a planning tool, not a guarantee.
How does employer match work? +
Employers match a percentage of your contributions up to a limit of your salary. Example: 50% match on first 6% means if you save 6% of your salary, the employer adds an additional 3%. Always contribute enough to get the full match—it's free money that accelerates growth.
What is the 4% rule for monthly income? +
The 4% rule suggests you can withdraw 4% of your retirement savings in the first year, adjust for inflation later, and likely not run out of money for 30 years. We use this to estimate monthly income. Example: $1,000,000 balance → $40,000/year → ~$3,333/month.
What is the 401k contribution limit for 2026? +
For 2026, the IRS limit is $23,500 for employees under 50, plus a $7,500 catch-up contribution for those age 50 and older. Our calculator does not enforce these limits—please adjust your contribution percentage accordingly if you exceed them.
Should I prioritize 401k or Roth IRA? +
Generally, contribute enough to get the full 401k match first (free money), then max out a Roth IRA, then return to increasing 401k contributions. Both have tax advantages: 401k reduces taxable income now, Roth gives tax-free growth in retirement.
What happens to my 401k if I change jobs? +
You have several options: leave it with your former employer, roll it over to your new employer's 401k plan, or roll it into an Individual Retirement Account (IRA). Rolling to an IRA often gives you more investment choices and potentially lower fees.
How does inflation affect my retirement savings? +
Inflation erodes purchasing power over time. For conservative estimates, use a real return (nominal return minus inflation). Our calculator uses nominal returns; you can subtract 2-3% for inflation to see real spending power. Consider investing in assets that outpace inflation.
Can I change my contribution percentage over time? +
Yes, you can adjust your 401k contribution percentage at any time through your employer. Our calculator assumes a constant % of salary for simplicity, but you can run multiple scenarios by moving the slider to model different savings rates over your career.
* This projection is for illustrative purposes. Actual market returns and contribution limits may vary. Review annually.