Portfolio Withdrawal Sustainability Calculator

Use the Portfolio Withdrawal Sustainability Calculator

Your results

Ending portfolio balance: $0.00
Total withdrawals: $0.00
Real return after inflation: 0.00%
Sustainability result: Not calculated

How this calculator works

What it does: Estimate whether a portfolio may sustain fixed annual withdrawals after adjusting expected returns for inflation.
Inputs used: The estimate uses portfolio value, annual withdrawal amount, expected annual return (%), inflation rate (%), and number of years.
Calculation approach: The calculator applies the relationships defined for the portfolio withdrawal sustainability calculator to those inputs and updates ending portfolio balance, total withdrawals, real return after inflation, and sustainability result.
How to read the result: Treat the result as a scenario based on the values entered. Compare a few reasonable inputs and consider costs, taxes, timing, or risks that the calculator does not include.

How to Use This Calculator

Enter Portfolio value and Annual withdrawal amount using values that match the scenario you want to evaluate.
Enter Expected annual return (%) and Inflation rate (%) using values that match the scenario you want to evaluate.
Enter Number of years using values that match the scenario you want to evaluate.
Review the assumptions for the portfolio withdrawal sustainability calculator, especially rates, time periods, and optional amounts.
Select Calculate to update the results, then adjust one input at a time to compare scenarios.

Understanding the Results

Ending portfolio balance: The estimated value at the end of the selected period after applying the entered contributions, rates, and timing assumptions.
Total withdrawals: The combined amount estimated from the recurring values and time period in this scenario.
Real return after inflation: The real return after inflation estimated by the Portfolio Withdrawal Sustainability Calculator using portfolio value, annual withdrawal amount, and expected annual return (%) and the other values entered.
Sustainability result: A plain-language comparison based only on the assumptions entered; it is not a guarantee or personal recommendation.

Common Mistakes

Treating a constant return or withdrawal rate as a guaranteed outcome.
Leaving out inflation, taxes, fees, healthcare, or irregular retirement expenses.
Using current spending without considering how expenses may change later.
Relying on one scenario instead of testing more cautious assumptions.

Worked Example

Example inputs

Portfolio value: $1,000,000
Annual withdrawal amount: $40,000
Expected annual return (%): 7%
Inflation rate (%): 3%
Number of years: 30

Example results

Ending portfolio balance: $935,915.55
Total withdrawals: $1,200,000.00
Real return after inflation: 3.88%
Sustainability result: Sustainable: portfolio remains above zero

Under these example assumptions, the sustainability result is Sustainable: portfolio remains above zero. This comparison illustrates the entered scenario and is not a guarantee that the same option will be better in practice.

Frequently asked questions

What does portfolio withdrawal sustainability mean?

It estimates whether a portfolio remains above zero after applying an inflation-adjusted return and subtracting a fixed withdrawal each year.

How is the real return calculated?

The calculator divides the nominal growth factor by the inflation growth factor. This is more precise than simply subtracting inflation from the expected return.

Does the annual withdrawal increase with inflation?

No. The entered withdrawal remains fixed in real-dollar terms because portfolio growth is modeled using the real return after inflation.

Does a sustainable result guarantee the plan will work?

No. Actual returns vary from year to year, and poor early returns can materially affect retirement outcomes. This calculator uses one constant annual return assumption.

Are taxes and investment fees included?

No. Reduce the expected return or increase the withdrawal amount if you want to approximate fees, taxes, or other portfolio costs.

What does the Portfolio Withdrawal Sustainability Calculator calculate?

Estimate whether a portfolio may sustain fixed annual withdrawals after adjusting expected returns for inflation. The result is based only on the inputs and assumptions shown on the page.

How should I interpret the sustainability result from the Portfolio Withdrawal Sustainability Calculator?

Use it as an estimate for the scenario entered, not as a guarantee or personal recommendation. Test changes to portfolio value, annual withdrawal amount, and expected annual return (%) to see which assumptions have the greatest effect.