Retirement withdrawal calculator that estimates how long savings will last from spending needs, other income, inflation-adjusted withdrawals, expected return.
Finance planning estimate
Topic review: James Whitfield
Retired Financial Planner. Assigned as the finance topic reviewer for mortgage, retirement, annuity, pension, and long-term planning calculators.
Retirement withdrawal planner Estimate how long your retirement savings will last after other income, inflation-adjusted withdrawals, expected returns, and a planning horizon are all included.
Portfolio withdrawal amount The calculator subtracts other monthly income from spending first. With the current inputs, the portfolio needs to provide $3,300.00 per month, or 3.96% of the starting balance in the first year.
Display currency
Result
Never depleted
Your portfolio withdrawal is covered by the return assumption or by other income in this simplified projection.
Withdrawal rate
3.96%
Portfolio withdrawal
$3,300.00
Final balance
$528,868.72
Stress check
If annual returns are 2 points lower
A 3% return assumption changes the result to 27 years and 6 months, with depletion around age 92.5.
Interpretation
What the result can and cannot prove
This is a deterministic drawdown projection. It makes inflation and other income visible, but it still smooths returns into one constant rate and cannot show sequence-of-returns risk, taxes, account-specific rules, or unexpected spending shocks.
How long will your retirement savings last at different withdrawal rates
A retirement withdrawal calculator estimates how many years and months your nest egg may sustain a given retirement spending plan, accounting for investment returns, other monthly income, and inflation-adjusted withdrawals. It helps you compare a safe withdrawal rate, stress-test the result, and see whether savings last through the retirement horizon you actually want to plan around.
How the depletion calculation works
Each month, the remaining balance earns one month of investment return, then the monthly withdrawal is subtracted. If the return earned each month exceeds the withdrawal, the nest egg is never depleted. Otherwise, the calculator solves for the number of months until the balance reaches zero.
The closed-form formula is: Months = −ln(1 − P×r/W) / ln(1+r), where P is the nest egg, r is the monthly return rate, and W is the monthly withdrawal. For a zero-return scenario, it simplifies to P/W months.
Months = −ln(1 − P × r / W) / ln(1 + r)
P is the initial nest egg, r is the monthly return rate (annual rate / 12 / 100), and W is the monthly withdrawal. If P × r ≥ W, the nest egg is never depleted because investment returns cover the withdrawals.
The 4% rule and safe withdrawal rates
The '4% rule' originated from the Trinity Study (1998), which found that a 4% initial withdrawal rate, adjusted annually for inflation, had a high probability of lasting 30 years across historical market conditions. It has become the most widely cited retirement planning guideline.
However, the 4% rule assumes a specific asset allocation (roughly 50/50 stocks and bonds) and historical U.S. market returns. In lower-return environments, many financial planners now suggest 3–3.5% as a more conservative starting point. The withdrawal rate comparison table helps you see how different rates affect longevity.
Why inflation and other income change the answer
Many retirement income calculator pages ask only for a portfolio balance and a withdrawal amount. That is useful for a quick first pass, but it can overstate or understate portfolio pressure when part of the household budget is covered by Social Security, a pension, annuity income, rental income, or other predictable cash flow.
This calculator therefore separates the total monthly spending need from other monthly income. The portfolio withdrawal starts with the gap between those two numbers, then the withdrawal is increased each year by the inflation assumption. That makes the result closer to the question people usually mean when they search how long will my retirement savings last.
How to use the stress check and planning horizon
The stress check shows what happens if annual returns are two percentage points lower than the main assumption. It is not a full Monte Carlo simulation, but it is a fast way to see whether the plan depends on optimistic returns. If a modest return haircut changes the answer dramatically, the withdrawal rate may be too fragile.
The planning horizon matters too. A 65-year-old couple may want to test 30 to 35 years, while an early retiree may need 45 years or more. When the calculator says the balance lasts past the horizon, it means the deterministic projection stayed positive through that selected window, not that the portfolio is guaranteed to last forever.
Understanding the withdrawal rate comparison
The comparison table shows how long your savings last at withdrawal rates from 3% to 8% of your nest egg, using your specified return rate. Lower withdrawal rates dramatically extend the duration — the relationship is not linear.
At low withdrawal rates with reasonable returns, your savings may never be depleted because investment returns exceed withdrawals. This is the mathematical ideal, though real-world inflation, market volatility, and unexpected expenses mean a margin of safety is important.
Factors that affect sustainability
Investment returns are the most sensitive variable. A 1% difference in annual return can change the depletion timeline by 5–10 years. Asset allocation, fees, and tax drag all affect your realized return.
Inflation erodes purchasing power — a fixed withdrawal loses value over time. Many retirees increase withdrawals annually to keep pace with inflation, which shortens the depletion timeline. This calculator uses a fixed withdrawal for simplicity; adjust periodically to model inflation.
Sequence of returns risk
This calculator assumes a constant annual return, but real markets fluctuate. Poor returns in the early years of retirement — 'sequence of returns risk' — can deplete a portfolio much faster than the average return would suggest.
A retiree experiencing a bear market in the first few years while making withdrawals may run out of money decades sooner than one who experiences the same bear market later. This is why many advisors recommend maintaining 1–2 years of expenses in cash or short-term bonds as a buffer.
Limitations
This calculator assumes a constant monthly withdrawal and a constant annual return. It does not model inflation adjustments, variable withdrawal strategies, required minimum distributions (RMDs), Social Security income, or market volatility.
For comprehensive retirement planning, consider Monte Carlo simulations that model thousands of market scenarios. This calculator is best for quick comparisons and understanding the fundamental relationship between withdrawal rate, returns, and portfolio longevity.
Frequently asked questions
What is a safe withdrawal rate?
The traditional guideline is 4% of your initial portfolio per year, adjusted for inflation. More conservative planners suggest 3–3.5% in current market conditions. The 'safe' rate depends on your time horizon, asset allocation, and risk tolerance.
What is the 4% rule?
The 4% rule says you can withdraw 4% of your portfolio in the first year of retirement, then adjust that dollar amount for inflation each year, with a high probability of not running out of money over 30 years. It comes from the 1998 Trinity Study.
What return rate should I assume?
A balanced portfolio (60% stocks, 40% bonds) has historically returned about 7–8% before inflation, or 4–5% after inflation. Be conservative — using 4–5% nominal or 2–3% real is prudent for planning purposes.
What does 'never depleted' mean?
It means your investment returns exceed your withdrawals each month, so the portfolio balance grows or stays stable indefinitely. In practice, market volatility and inflation may still cause depletion over very long periods.
How does inflation affect my withdrawal plan?
Inflation reduces purchasing power. If you withdraw a fixed $4,000/month, it buys less each year. This calculator can increase the portfolio withdrawal each year by the inflation assumption, which usually shortens the portfolio's lifespan compared with a fixed-dollar withdrawal.
Should I subtract Social Security or pension income before using the calculator?
Yes. Enter your full monthly spending need, then enter expected Social Security, pension, annuity, or other monthly income in the other income field. The calculator uses the remaining gap as the amount your portfolio must provide.
Why does the stress check use a lower return?
A lower-return stress check helps reveal whether the plan only works under optimistic market assumptions. It is simpler than a full Monte Carlo simulation, but it is useful for quickly comparing a base case with a more conservative drawdown path.
What is sequence of returns risk?
It's the risk that poor market returns early in retirement deplete your portfolio faster than average returns would suggest. Two retirees with the same average return over 30 years can have very different outcomes depending on when the bad years occur.
Should I include Social Security in my withdrawal plan?
Social Security reduces how much you need to withdraw from savings. Subtract your expected Social Security income from your monthly needs, then use the remainder as your withdrawal amount in this calculator.
How does the withdrawal rate comparison table work?
It calculates how long your nest egg lasts at withdrawal rates of 3% through 8%, using your specified return rate. The row closest to your actual withdrawal rate is highlighted. This helps you compare the trade-off between monthly income and portfolio longevity.
What about required minimum distributions?
RMDs from traditional IRAs and 401(k)s start at age 73 (as of 2023) and increase each year. RMD percentages are higher than typical safe withdrawal rates in later years. This calculator does not model RMDs — consult IRS life expectancy tables for those calculations.
Can I change my withdrawal amount over time?
Yes, and many advisors recommend it. Dynamic strategies — reducing withdrawals in down markets and increasing in up markets — significantly improve portfolio survival. Recalculate periodically with your updated balance.
