Fixed withdrawals keep the same currency amount. Inflation-adjusted withdrawals raise that amount to help preserve spending power. With positive inflation, increasing withdrawals puts more pressure on the same savings balance. A fixed withdrawal can make the money last longer while leaving you with less to spend in real terms.
That trade-off matters more than the headline depletion date. A plan that keeps paying 2,000 each month for decades is not funding the same lifestyle as one that raises those payments with prices.
Compare your own assumptions: the How Long Will My Money Last Calculator shows both paths together, including the first underfunded withdrawal and a downloadable monthly schedule. It uses constant returns, not a market forecast or a probability of success.
What changes when withdrawals rise with inflation?
Suppose your savings must provide 2,000 a month after other income. A fixed nominal withdrawal stays at 2,000. With a constant 2.5% annual inflation adjustment, the monthly withdrawal becomes 2,050 in year two and about 3,277 in year 21.
Those higher future amounts are intended to buy roughly what 2,000 buys today under the assumed inflation path. They do not represent an improvement in lifestyle. Your actual costs can rise at a different pace: the European Central Bank explains that inflation reflects a broad basket of prices, while households have different spending patterns.
| Time from the start | Fixed monthly amount | Fixed amount in today’s purchasing power | Amount needed to preserve initial purchasing power |
|---|---|---|---|
| Start | 2,000 | 2,000 | 2,000 |
| 10 years | 2,000 | 1,562 | 2,560 |
| 20 years | 2,000 | 1,221 | 3,277 |
| 30 years | 2,000 | 953 | 4,195 |
All amounts use one currency throughout and round to the nearest whole unit. This is an inflation illustration, not a forecast. The final column describes a spending target; it does not mean the portfolio can fund it.
The same 500,000 balance, two withdrawal paths
Consider savings of 500,000 and an initial monthly withdrawal of 2,000. Assume a 4% nominal annual return before fees, a 0.25% annual fee on the balance, 2.5% annual inflation and a 40-year model horizon. There are no new deposits, tax calculations or one-off expenses.
Under those assumptions, fixed withdrawals are fully funded for 474 months, or 39 years and 6 months. Month 475 uses up the remaining balance and cannot pay the full requested amount. With annual inflation increases, the balance funds 292 full monthly withdrawals, or 24 years and 4 months; month 293 is partial.
The fixed scenario lasts longer because it asks the portfolio to deliver less purchasing power over time. The adjusted scenario maintains the modeled spending target until the balance cannot cover it. Neither result establishes a safe retirement plan.
How sensitive is the answer to returns and inflation?
Keep the 500,000 starting balance, 2,000 initial monthly withdrawal, 0.25% annual balance fee and 40-year horizon. Change only the gross nominal return and the annual increase in withdrawals:
| Gross nominal annual return | Fixed withdrawals | Withdrawals rise 2.5% a year | Withdrawals rise 4% a year |
|---|---|---|---|
| 0% | Month 244 | Month 201 | Month 183 |
| 2% | Month 311 | Month 236 | Month 210 |
| 4% | Month 475 | Month 293 | Month 249 |
“Month 293” means 292 full withdrawals were possible before the first partial payment. At a 0% gross return, the balance still declines through fees before withdrawals. The rows are hypothetical sensitivity tests, not observed returns, expected outcomes or equally likely scenarios.
The table also shows why choosing a more optimistic return to make a plan work is weak reasoning. A small change in assumptions can move the shortfall by years. Use the comparison to identify how much your decision depends on a smooth return that markets will not actually deliver.
A constant return leaves out sequence risk
Return order matters when money is leaving the portfolio. Poor returns early in retirement can force withdrawals from a reduced balance, leaving less capital for a recovery. BlackRock’s investor-education illustration demonstrates that adding withdrawals can produce different outcomes across return sequences with similar overall growth.
Our calculator spreads the entered annual growth and fee factors evenly across months. It cannot represent an early market crash, a recovery, changing inflation or the interaction between them. A result that survives the selected horizon therefore means only that the entered constant-rate arithmetic did not exhaust the balance during that period.
The 4% rule guide covers the separate historical withdrawal-rate question. The familiar rule begins with a percentage of the initial portfolio and then adjusts the currency amount for inflation. It is different from withdrawing a fixed percentage of whatever balance remains each year.
Which amount should you enter?
Start with the gross withdrawal your savings must provide. If spending is 3,000 a month and other income covers 1,000, the initial gap is 2,000. If withdrawing that sum triggers taxes, your required gross withdrawal may be higher; calculate that separately for your jurisdiction.
The tool raises the entire withdrawal gap by the entered inflation rate. That simplification may not fit a household whose pension rises differently from expenses, whose income starts later, or whose spending includes a large fixed mortgage payment. It also leaves out irregular costs such as repairs and care. Keep those limitations in view when interpreting a depletion date.
If you are still building savings, use the Retirement Savings Calculator for the accumulation question. For the difference between future currency amounts and purchasing power, see nominal versus real returns.
What if the calculator says the money does not run out?
Read it as “not depleted within the selected model horizon.” It does not mean the money lasts forever, the spending is safe, or the return is guaranteed. Try a weaker return and a higher withdrawal before drawing a conclusion. Changes in markets, income and household spending call for revisiting the plan.
Method, sources and limits
The tables are original Finance Charts calculations. The monthly growth factor is [(1 + annual nominal return) × (1 − annual balance fee)]1/12. Growth after fees is applied before each month-end withdrawal. The amount paid cannot exceed the available balance.
Inflation-adjusted withdrawals use the initial amount for months 1–12, then multiply it by (1 + inflation) at months 13, 25 and each following annual anniversary. Fixed purchasing power after n years is 2,000 ÷ 1.025n; the equivalent increased amount is 2,000 × 1.025n. Calculations retain full precision before display rounding.
- European Central Bank — What is inflation? Supports the purchasing-power and household-basket explanation. Its measurement context is the euro area.
- BlackRock — Sequence of returns risk Supports the return-order explanation; it is US investor education, not a rule adopted for this global model.
- Finance Charts — Methodology
Source concepts checked on 19 October 2026. No historical market series is used here. The calculations exclude changing returns, taxes, account and pension rules, exchange-rate movements and lifespan. Educational scenarios do not establish personalised financial advice or a probability that a withdrawal plan succeeds.