Practical guide
Understanding retirement withdrawal planner — two-scenario comparison
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.
Building two independent scenarios
Scenario A and Scenario B each have a complete set of inputs for this retirement withdrawal planner calculation. Change several inputs in B when comparing genuinely different plans, then inspect the B-minus-A headline difference and the detailed rows. When multiple inputs change, the total difference cannot be attributed to just one of them.
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.
- Scenario A — Retirement portfolio
- 750,000 $
- Scenario A — Initial annual withdrawal rate
- 4 %
- Scenario A — Annual inflation adjustment
- 2.5 %
- Scenario A — Years in retirement
- 30 years
- Scenario A — Assumed annual return
- 4 %
- Scenario A — Annual portfolio fees
- 0.3 %
- Scenario B — Retirement portfolio
- 938,000 $
- Scenario B — Initial annual withdrawal rate
- 4 %
- Scenario B — Annual inflation adjustment
- 2.5 %
- Scenario B — Years in retirement
- 30 years
- Scenario B — Assumed annual return
- 4 %
- Scenario B — Annual portfolio fees
- 0.3 %
Scenario B result: $37,520
Scenario A: $30,000. First-year withdrawal.
- Scenario A main result: $30,000
- Scenario B main result: $37,520
- Numeric difference (B − A), in result units: 7,520
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.
- Why is this different from the one-factor comparison?
- The one-factor tool changes only retirement portfolio. This version lets all model inputs differ, so it is more flexible but does not isolate the effect of any single change.