Retirement withdrawal strategies
A withdrawal strategy needs two decisions: how much to take initially and how later withdrawals change. Different adjustment rules can turn the same starting amount into very different income.
Last reviewed Methods and sources
The adjustment rule changes the result
Start with an illustrative $500,000 balance and $20,000 first-year withdrawal. Now assume next year opens with $400,000 and the chosen inflation adjustment is 3%.
Fixed dollars remain $20,000. Inflation-adjusted spending rises to $20,600. Recalculating 4% of the current balance reduces the withdrawal to $16,000.
The $400,000 opening balance and 3% inflation are hypothetical inputs, not a market forecast. The comparison isolates the spending rule; it does not calculate how the portfolio reached that balance.
Year two, following a $20,000 first-year draw from $500,000. The $400,000 opening balance and 3% inflation are assumed.
Three approaches, three tradeoffs
| Spending rule | Next withdrawal | What changes |
|---|---|---|
| Fixed nominal dollars | $20,000 | Purchasing power varies with prices |
| Inflation-adjusted dollars | $20,600 | Required dollar withdrawals grow |
| 4% of current balance | $16,000 | Dollar income moves with the balance |
Fixed nominal withdrawals are straightforward to model: the same dollars leave each period. Their simplicity does not mean the same goods and services remain affordable.
Inflation-adjusted withdrawals increase the spending amount with a chosen inflation measure. The usual 4% convention discussed here is an initial-percentage version of this approach. Fidelity’s cited guidance describes starting with a percentage and adjusting the resulting dollar amount for inflation.
Current-balance percentage withdrawals recalculate the amount from the portfolio at a specified review date. A smaller balance leads to a smaller withdrawal. The rule adjusts spending pressure on the portfolio, but the household must be able to manage the resulting changes in income.
Nominal dollars and buying power
With a hypothetical 3% inflation rate for ten years, $20,000 of unchanged nominal spending buys about $14,882 in starting-year dollars.
Maintaining the original $20,000 buying power under that assumption requires about $26,878 nominal dollars after ten annual adjustments.
Adjusted nominal amount = $20,000 × 1.03¹⁰
This is inflation arithmetic. Neither amount establishes whether a portfolio can fund the chosen spending for the full period.
Purchasing power after ten years at assumed 3% annual inflation, expressed in starting-year dollars.
Make the rule usable before modeling it
Specify the payment and review dates
A $24,000 annual budget might be paid as $2,000 monthly, or as a single annual amount. Those cash flows have different timing. Choose the timing first, then use a model that matches it.
For a percentage strategy, state which balance is used and when it is measured. “4% each year” is incomplete without a valuation date and payment schedule.
Separate required spending from flexible spending
List the expenses the portfolio must fund after other income, and identify which amounts could change if the withdrawal rule calls for a reduction. A model that permits large cuts is not useful if those cuts cannot be carried out.
Taxes, investment fees, one-time expenses and changing household needs can affect the spendable amount. In this site’s simple models, withdrawal amounts are before any personal tax calculation; do not assume the displayed number equals take-home spending.
Test more than a comfortable return
The money-lasts calculator compares fixed monthly withdrawals using your return, inflation and timing assumptions. The withdrawal calculator solves for an amount over a chosen number of years. Both use constant returns; neither measures the effect of a particular sequence of market gains and losses.
The safe withdrawal rate guide shows why a constant-return result is different from a statement about risk. A Roth conversion ladder addresses the timing and taxation of access to certain funds; it is not itself a spending-adjustment rule.
Source and review date
Reviewed . Fidelity, “How can I make my retirement savings last?”, dated May 26, 2026, supports the initial-percentage withdrawal followed by inflation adjustments convention. No historical success figures, return forecasts or recommended rate ranges are imported here.
The three-rule comparison and purchasing-power figures are original hypothetical arithmetic. See the published calculation methods for the tools’ monthly return and payment assumptions. This guide is educational, not financial advice.
Questions and answers
Is withdrawing 4% of the current balance the same as the 4% rule?
No. The convention discussed on this site takes 4% of the initial balance in the first year and then adjusts that dollar amount for inflation. Recalculating a percentage of the current balance each year produces a different, variable spending amount.
Does an inflation-adjusted withdrawal guarantee purchasing power?
It targets constant purchasing power under the inflation assumption used. It does not guarantee that the portfolio can fund every withdrawal, and a household’s actual expenses can change differently from that assumed inflation rate.
Can a fixed-percentage strategy still fail to cover expenses?
Yes. A percentage of a smaller balance produces fewer dollars. Even if the spending formula leaves part of the portfolio invested, the resulting income can be too low for the expenses it needs to cover.
Which approach does the depletion calculator use?
The calculator models a chosen monthly withdrawal under a constant effective return. With inflation adjustment enabled, it uses a real return and reports the scenario in purchasing-power terms. It does not simulate a rule that recalculates spending as a percentage of the current portfolio each year.