The 4% rule for retirement: how it works and its limits
Quick answer: the 4% rule says that if you withdraw 4% of your retirement savings in your first year of retirement, then increase that dollar amount each year with inflation, your money has historically had a high chance of lasting at least 30 years. Flipped around, it gives a quick savings target: multiply your yearly spending from savings by 25.
How the 4% rule works
| Step | Example |
|---|---|
| Savings at retirement | $1,000,000 |
| Year 1 withdrawal (4%) | $40,000 |
| Inflation that year | 3% |
| Year 2 withdrawal | $41,200 |
| Year 3 (inflation 2.5%) | $42,230 |
You do not recalculate 4% of the balance each year. You take your first-year amount and adjust it for inflation, regardless of how markets did.
The 25x rule: how much do you need?
Because 4% is 1/25, the rule implies you need 25 times the annual income you want from savings.
| Income needed from savings each year | Savings target (x25) |
|---|---|
| $20,000 | $500,000 |
| $30,000 | $750,000 |
| $40,000 | $1,000,000 |
| $60,000 | $1,500,000 |
| $80,000 | $2,000,000 |
Subtract guaranteed income first. If you need $60,000 a year and expect $24,000 from Social Security, you need to fund $36,000 from savings, which is a target of $900,000. See Social Security full retirement age for how claiming age changes that number.
Where the 4% rule comes from
Financial planner William Bengen tested withdrawal rates against US market history back to 1926 and published his findings in 1994. He found that 4% of a portfolio split roughly between stocks and bonds survived every 30-year period in his data. The later “Trinity study” reached similar conclusions.
Limitations to keep in mind
- It assumes a 30-year retirement. Retiring at 50 or earlier may call for 3% to 3.5%.
- It is based on past US returns. Future returns may be lower or higher.
- Sequence of returns risk. A market crash in the first few years of retirement hurts far more than one later.
- It ignores fees and taxes. Withdrawals from traditional accounts are taxed, and high fees lower the safe rate.
- It is rigid. Real retirees spend less in bad years and more in good ones.
Flexible alternatives
- Guardrails: raise spending after good years and cut it by a set percentage after bad ones.
- Percentage of balance: withdraw a fixed percent of whatever the balance is each year. Your money never runs out, but income varies.
- Bucket strategy: keep 1 to 3 years of spending in cash, so you do not sell investments in a downturn.
- Guaranteed income: delaying Social Security or buying an annuity covers essentials.
How RMDs fit in
Once you reach RMD age, you may be required to withdraw more than 4% from tax-deferred accounts. You do not have to spend it; you can reinvest it in a taxable account. See required minimum distributions.
Frequently asked questions
Is the 4% rule still valid? Many researchers still see 4% as a reasonable starting point for a 30-year retirement, with some suggesting slightly lower or higher depending on market conditions.
How much can I withdraw from $500,000? About $20,000 in the first year under the 4% rule.
Does the 4% rule include Social Security? No. It applies only to your investment portfolio.
This article is general information, not financial advice. Consider speaking with a fee-only financial planner.