Retirement Withdrawal Calculator
How It Works
One of the most critical questions in retirement planning is whether your savings will last as long as you need them to. Unlike the accumulation phase where you are adding money to your accounts, the withdrawal phase requires careful management to avoid running out of money. This calculator simulates year-by-year withdrawals from your retirement portfolio, accounting for both investment returns and the rising cost of living due to inflation.
Inflation is the silent threat to retirement security. A dollar today buys less each year, so your withdrawals must increase over time just to maintain the same standard of living. If you withdraw $40,000 in your first year of retirement and inflation averages 3% per year, you will need to withdraw approximately $41,200 in year two, $42,436 in year three, and so on. Over 25 years, that initial $40,000 withdrawal grows to nearly $84,000 per year just to maintain the same purchasing power. This calculator adjusts your withdrawal amount for inflation each year to show a realistic depletion timeline.
The 4% rule is the most widely cited guideline for retirement withdrawals. Developed by financial planner William Bengen in 1994, it states that withdrawing 4% of your portfolio in the first year of retirement, then adjusting that amount for inflation each subsequent year, has historically provided a high probability of lasting at least 30 years. For a $1,000,000 portfolio, that means a first-year withdrawal of $40,000. While this rule provides a useful starting point, it was based on historical U.S. market returns and a specific asset allocation, and may not hold in all future scenarios.
Your actual sustainable withdrawal rate depends on your portfolio's expected return, inflation, your time horizon, and your tolerance for running out of money. A portfolio earning 6% with 3% inflation has a real return of approximately 3%. If your withdrawal rate exceeds the real return, your portfolio will eventually deplete. The safe withdrawal rate shown in this calculator is the maximum first-year withdrawal that, when increased for inflation annually, allows your portfolio to last exactly 30 years given your specified return and inflation assumptions.
The year-by-year schedule provided by this calculator shows exactly when your money would run out under your chosen withdrawal strategy. If the timeline is shorter than you need, you have several options: reduce your withdrawal amount, work longer to build a larger nest egg, find ways to earn supplemental income in retirement, or adjust your portfolio allocation to potentially achieve higher returns (while accepting more risk). Many financial advisors recommend building flexibility into your withdrawal plan — reducing spending in years when the market declines and allowing slightly higher withdrawals when markets are strong.
Formula Breakdown
The withdrawal simulation uses year-by-year calculations:
Year N Balance = Year (N-1) Balance x (1 + Return Rate) - Withdrawal N
Withdrawal N = Initial Withdrawal x (1 + Inflation Rate)^N
Where:
- Return Rate = Expected annual investment return (e.g., 6% = 0.06)
- Inflation Rate = Expected annual inflation (e.g., 3% = 0.03)
Safe Withdrawal Rate (30-year target):
Iteratively finds the withdrawal amount where balance reaches $0 at year 30.
4% Rule Amount:
First-year withdrawal = Current Savings x 0.04
Example with $1,000,000 savings, $40,000 withdrawal, 6% return, 3% inflation:
Year 1: Withdrawal = $40,000
End Balance = $1,000,000 x 1.06 - $40,000 = $1,020,000
Year 2: Withdrawal = $40,000 x 1.03 = $41,200
End Balance = $1,020,000 x 1.06 - $41,200 = $1,040,000
...continues until balance reaches $0 or 50 years
The depletion year is when the end-of-year balance first drops to $0 or below.Related Calculators
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