Calculator Panel
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Enter your values above and click Calculate.
What This Calculator Does
This calculator projects the annual balance of your retirement nest egg year-by-year, showing if your portfolio will survive your expected retirement lifespan or depletion timelines.
How to Use This Calculator
Enter your starting nest egg balance, first-year annual withdrawal amount, expected annual return, estimated inflation rate, and retirement years. Click Calculate to project longevity.
How the Calculation Works
The underlying math engine processes your inputs using exact formulas. This systematic approach ensures professional, institutional-grade calculation precision:
Mathematical Formula
Formula Legend:
- · Annual Withdrawal is deducted at the start of each year.
- · Remaining balance compounds at the expected rate of return.
- · Withdrawal amount increases annually by the inflation rate.
Practical Example
You retire with a $1,000,000 nest egg, a first-year withdrawal of $45,000, an expected annual return of 6.0%, and a 3.0% inflation rate over a 30-year retirement lifespan:
Step-by-Step Mathematical Walkthrough:
- 1 Initial Balance = $1,000,000, Initial Withdrawal = $45,000 (4.5% rate).
- 2 At Year 30: Your remaining balance is approximately $758,210.
- 3 Your savings successfully survive the retirement horizon with zero risk of depletion.
- 4 If you increase the first-year withdrawal to $65,000 (6.5%), the savings would be depleted in Year 22.
Important Assumptions & Notes
- Withdrawals occur at the beginning of each year, and the remaining capital compounds annually.
- The return rate and inflation rate remain perfectly steady.
- Tax drag is either included in the withdrawal or excluded from this model.
Common Mistakes or Considerations
- Choosing a withdrawal rate higher than 4.5% on a volatile stock portfolio, which increases the risk of premature depletion during market downturns.
- Not modeling inflation, which forces you to take out larger nominal amounts over time to buy the same groceries and services.
Frequently Asked Questions
What is a safe withdrawal rate (SWR)?
The SWR is the percentage of your portfolio you can withdraw in the first year of retirement, and adjust for inflation annually, with low risk of running out of money over 30 years (typically 4.0%).
How does inflation impact longevity?
Inflation forces your nominal withdrawals to increase each year. If inflation is high, your withdrawals will grow rapidly, accelerating portfolio depletion.
What should I do if my longevity projection is negative?
You can increase longevity by reducing your initial withdrawal rate, delaying retirement to let assets compound, or shifting portfolio allocations to optimize yields.