---
title: Safe withdrawal rate (the 4% rule) — what it means and why it matters | Allocate AI
description: The percentage of a portfolio you can spend each year, adjusted for inflation, with a good chance it lasts 30 years; the classic estimate is 4%.
canonical: https://allocateai.io/glossary/safe-withdrawal-rate
site: Allocate AI — https://allocateai.io
---

# Safe withdrawal rate (the 4% rule)

The percentage of a portfolio you can spend each year, adjusted for inflation, with a good chance it lasts 30 years; the classic estimate is 4%.

A safe withdrawal rate is the share of your savings you can take out in the first year of retirement, then raise with inflation each year, without running out over a long retirement. The most cited figure is 4%, from a 1990s study of US market history that found a 4% starting withdrawal survived nearly every 30-year period since the 1920s.

The rule runs both ways. Withdrawing 4% of $1,500,000 gives $60,000 in year one. Turned around, it says you need 25 times your annual spending to retire: $60,000 of spending times 25 is $1,500,000. That multiplier is the backbone of most FIRE planning.

Four percent is a starting point, not a law. Retiring at 40 instead of 65 means a 50-year horizon, where many planners use 3.25% to 3.5%. High stock valuations, low bond yields, and heavy fees all argue for a lower rate. A pension, Social Security, or willingness to cut spending in bad years argues for a higher one.

The common mistake is applying 4% to a portfolio with a large slice in one employer's stock, or in cash, when the research assumed a diversified mix of stocks and bonds. A second is treating it as fixed: real retirees adjust spending as markets move, which is what makes the plan durable.

[Try the FatFIRE Withdrawal Calculator →](https://allocateai.io/calculators/fire-withdrawal)

## Related terms

- [FIRE (financial independence, retire early)](https://allocateai.io/glossary/fire) — A plan to save a large share of income so that investments can cover living costs long before traditional retirement age.
- [FatFIRE](https://allocateai.io/glossary/fatfire) — Financial independence with a large budget, typically $100,000 or more of yearly spending, which means a portfolio of several million dollars.
- [Coast FIRE](https://allocateai.io/glossary/coast-fire) — Having enough invested that, with no more contributions, it will grow into a full retirement fund by normal retirement age; you only cover today's bills.
- [Asset allocation](https://allocateai.io/glossary/asset-allocation) — How your investments are split between stocks, bonds, and cash; the mix drives most of your long-term return and how bumpy the ride is.

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Allocate AI is a budgeting and financial-planning app: link your accounts, say what you want in plain words, and it writes the plan and stages every change for your approval. Read more at https://allocateai.io or see all pages in https://allocateai.io/llms.txt.