Variable Percentage Withdrawal Calculator
Estimate this year’s Variable Percentage Withdrawal (VPW) from your portfolio, age, asset mix, expected real returns, and fees. Add recurring retirement income to see the total spending the estimate supports.
Recommended annual portfolio withdrawal$48,322.05
- VPW withdrawal percentage
- 0.05%
- Monthly portfolio withdrawal
- $4,026.84
- Total annual spending available
- $78,322.05
- Total monthly spending available
- $6,526.84
- Net expected real portfolio return
- 0.04%
- Annual withdrawal with 2% lower return
- $36,234.63
- Annual withdrawals remaining
- 36
Recalculate each year using that year’s starting portfolio balance and age; the dollar withdrawal is not fixed.
Return and income assumptions are in today’s purchasing-power dollars.
How to use this calculator
- Enter the investable portfolio balance available at the start of this withdrawal year.
- Enter your current age and the planning age through which withdrawals should be funded.
- Set the stock allocation, real return assumptions, and annual investment fees.
- Enter recurring income such as Social Security, a pension, or an annuity separately from the portfolio.
- Recalculate next year using your new age and beginning-of-year portfolio balance.
How the VPW withdrawal is calculated
Variable Percentage Withdrawal, or VPW, sets a new portfolio withdrawal each year. It treats the remaining portfolio as funding a finite series of beginning-of-year withdrawals through the planning age. The result is a percentage of the portfolio, so a higher balance supports more spending and a lower balance supports less.
Let P be the current portfolio, A the current age, E the planning age, and n = E − A + 1 the number of withdrawals remaining. The calculator first finds a real, after-fee return: r = s × Rs + (1 − s) × Rb − F, where s is the stock allocation, Rs and Rb are the stock and bond real returns, and F is annual fees.
For a nonzero return, the annuity-due withdrawal factor is v = r ÷ ((1 + r) × (1 − (1 + r)^−n)). The annual portfolio withdrawal is W = P × v. If the net real return is zero or very close to zero, the calculation uses W = P ÷ n instead. “Annuity due” means each annual withdrawal is assumed to happen at the beginning of the year, including the current year.
What moves the result
Age and planning age determine how many withdrawals remain. With fewer remaining years, the VPW percentage rises because the method schedules the principal to be used over a shorter period. A higher expected real return also raises the withdrawal factor, while fees reduce it. Negative real-return assumptions are allowed; they generally require faster principal consumption and can produce a lower annual withdrawal.
Other income does not change the VPW portfolio withdrawal. It is added afterward to show annual and monthly spending available. The lower-return row repeats the formula with a net real return two percentage points lower, which is a sensitivity check rather than a forecast.
What this calculator leaves out
This is a deterministic estimate, not a Monte Carlo simulation. It does not model the sequence of actual market returns, taxes, account-specific withdrawal rules, trading costs, changes in Social Security or pension income, or an essential-spending floor. Its figures are in today’s purchasing-power dollars because the return assumptions are real returns. VPW is designed to be rerun after each year’s market result; it does not promise a stable dollar withdrawal or guarantee that savings will last.
Worked example
Suppose a 65-year-old has a $1,000,000 portfolio, plans through age 100, holds 60% stocks, expects 5% real stock returns and 1.9% real bond returns, and pays 0.15% in annual fees. The net expected real portfolio return is 3.61%, and there are 36 beginning-of-year withdrawals remaining.
The annuity-due factor is about 4.8322%, so the recommended annual portfolio withdrawal is $48,322, or $4,027 per month. With $30,000 of other annual retirement income, total annual spending available is about $78,322, or $6,527 per month. Reducing the net return by two percentage points changes the annual portfolio withdrawal to about $36,235.
Common questions
What is the variable percentage withdrawal method?
VPW is a retirement withdrawal approach that recalculates the amount to take from a portfolio each year. It uses the current balance, the number of years remaining, and an expected return to turn the portfolio into a finite annuity-due payment stream. The withdrawal can therefore rise or fall from year to year.
How does VPW differ from the 4% rule?
The 4% rule starts with a fixed percentage and typically adjusts that dollar amount for inflation. VPW instead recalculates a percentage from the current portfolio and remaining time horizon every year. That makes VPW more responsive to market changes, but it can make spending less predictable.
Why does the VPW percentage rise with age?
As age rises, fewer planned withdrawals remain. The annuity-due calculation spreads the remaining principal and expected growth across that shorter period, so the withdrawal percentage generally increases. A market loss can still make the resulting dollar amount lower despite the higher percentage.
Should Social Security and pension income be entered separately?
Yes. Enter recurring inflation-adjusted income separately because it does not change the amount the portfolio itself can support under VPW. The calculator adds it after the portfolio withdrawal to show the spending available for the year.
Do I rerun the VPW calculation every year?
Rerun it at the beginning of each withdrawal year using your updated age and investable portfolio balance. Do not carry forward the prior dollar amount automatically: recalculation is the feature that makes VPW respond to actual portfolio changes.
Does VPW guarantee that retirement savings will last?
No. The calculation relies on chosen return, fee, and planning-age assumptions, while real markets do not deliver a constant return. It can also produce a spending level that is unsuitable for essential expenses after a poor market outcome.