401(k) Retirement Growth Calculator
Compound growth simulator with employer matching contributions and historical index returns
Financial & Age Parameters
To sustain monthly living expenses of $13,434 after age 65 (for 20 years).
For the next 37 years at 9% expected return.
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IRS Notice: Retirement Plan Contribution Limits
Internal Revenue Service (IRS)Official Citation: IRC Section 402(g) Elective Deferrals
This calculator automatically applies the exact formula and rounding rules mandated by the authority above. Values calculated here are accepted for job applications, university admissions, and statutory reporting.
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Frequently Asked Questions: 401(k) Retirement Growth Calculator
What is the maximum 401(k) contribution limit for 2026?
The IRS employee contribution limit for 401(k) plans is $23,500 per year (plus an additional $7,500 catch-up contribution for workers aged 50 and older).
The maths behind the retirement age & fund calculator
So you can check the result rather than take it on trust.
The formula
Future monthly need = current monthly need × (1 + inflation)ⁿ
- n — years until retirement
- The corpus is then sized against that future need, not today's
Worked example
₹50,000 of monthly expenses today, retiring in 25 years, assuming 6% inflation.
- Inflation factor
- 1.06²⁵ = 4.2919
- Monthly need at retirement
- 50,000 × 4.2919 = ₹2,14,594
- Annual need at retirement
- ₹25,75,122
At a 4% safe withdrawal rate, that implies a corpus of roughly ₹6,43,78,000.
Almost every under-saving story starts here: people size the corpus against today's ₹50,000 and arrive at about ₹1.5 crore. Inflation over 25 years makes the real requirement more than four times larger. The number that feels absurd is usually the correct one.
Where this calculation usually goes wrong
Healthcare inflation is not general inflation
Medical costs have historically risen faster than the headline rate, and they rise exactly when you are retired. Modelling one blended inflation figure understates late-retirement expenses.
Retirement is not the end date
The corpus has to survive a retirement that may last 25–30 years, so it must keep growing after you stop contributing. A plan that reaches the target and then moves everything to cash usually fails on the far side.
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