Practical guide
Understanding retirement withdrawal planner — sensitivity table
Everyday editorial team · GEOINNOVATION CO., LTD · Published · Updated
What this calculation is for
A retirement drawdown projection explores whether a chosen spending pattern can fit a portfolio over a selected horizon. The distinction between a fixed percentage of the remaining fund and an inflation-adjusted dollar withdrawal is important: they produce different spending paths.
How the method works
This model takes a first-year amount equal to the initial portfolio times the withdrawal rate. That dollar amount grows by the inflation assumption each year. Withdrawals occur at the start of the year, are capped by available assets, and the remainder earns the assumed return after fees.
A worked example
A $500,000 starting balance at 4% gives a $20,000 first-year draw. With 3% inflation, the requested second-year draw is $20,600, not simply 4% of whatever the balance becomes.
Assumptions and real-world differences
A constant return cannot represent sequence risk or market crashes. Taxes, benefit income and changing care expenses are excluded. If assets deplete, requested future spending is not magically funded; the model caps withdrawals to what remains.
Reading the retirement portfolio sensitivity table
The tool evaluates the same model across a range of retirement portfolio values while holding other assumptions constant. Choose a realistic low value, high value and number of points. Each row reports the same headline measure; the table is a set of conditional calculations, not a probability distribution or a forecast. Input-step rounding can make nearby rows equal.
Reproduce this tool’s example
These fixed example inputs are independent of edits you make above. Enter them in this tool to reproduce the result, then replace them with your own assumptions.
- Minimum retirement portfolio
- 375,000 $
- Maximum retirement portfolio
- 1,125,000 $
- Number of comparison points
- 5 points
- Initial annual withdrawal rate
- 4 %
- Annual inflation adjustment
- 2.5 %
- Years in retirement
- 30 years
- Assumed annual return
- 4 %
- Annual portfolio fees
- 0.3 %
Sensitivity analysis: 5 comparison points
Retirement portfolio ranges from $375,000 to $1,125,000.
- Retirement portfolio: $375,000: $15,000
- Retirement portfolio: $563,000: $22,520
- Retirement portfolio: $750,000: $30,000
Frequently asked questions
- Is this a safe-withdrawal test?
- No. It is a deterministic scenario, not a probability or guarantee of success.
- Does it include Social Security?
- Not in this portfolio-only projection unless another tool explicitly provides that income input.
- Does the most favorable row show the most likely outcome?
- No. The table assigns no likelihood to any row. It shows how the result responds to the chosen assumption, and you remain responsible for selecting a plausible range.