The 4% rule, and what it really claims
The best-known shortcut says you can withdraw 4% of your portfolio in your first year of retirement, adjust that amount for inflation each year afterwards, and have a high probability of the money lasting 30 years. Inverted, it gives a target:
$60,000 a year → $1,500,000
$40,000 a year → $1,000,000
The rule came out of US historical market data across 30-year retirements. It is a planning anchor, not a guarantee — it assumes a diversified stock and bond portfolio, a fixed 30-year horizon and no change in behaviour when markets fall.
Targets by spending level
The 3% column is the more conservative version favoured for early retirement or longer horizons.
| Annual spending | At 4% (×25) | At 3% (×33) | If pensions cover 30% |
|---|---|---|---|
| $40,000 | $1,000,000 | $1,332,000 | $700,000 |
| $50,000 | $1,250,000 | $1,665,000 | $875,000 |
| $60,000 | $1,500,000 | $1,998,000 | $1,050,000 |
| $80,000 | $2,000,000 | $2,664,000 | $1,400,000 |
| $100,000 | $2,500,000 | $3,330,000 | $1,750,000 |
That last column matters more than most people expect. Social Security, a workplace pension or rental income all reduce the amount your portfolio has to produce. If guaranteed income covers $2,000 a month of a $5,000 monthly budget, your portfolio only needs to fund the remaining $3,000.
What it takes to get there
Monthly contributions needed to reach $1,500,000, assuming 7% average annual growth and starting from zero:
| Time horizon | Monthly needed | Total contributed | Growth |
|---|---|---|---|
| 10 years | $8,666 | $1,039,953 | $460,047 |
| 15 years | $4,732 | $851,836 | $648,164 |
| 20 years | $2,879 | $691,076 | $808,924 |
| 25 years | $1,852 | $555,506 | $944,494 |
| 30 years | $1,230 | $442,633 | $1,057,367 |
| 35 years | $833 | $349,795 | $1,150,205 |
Over 30 years, growth does more of the work than contributions do. Over 10 years it barely helps — which is the single strongest argument for starting early rather than saving harder later.
What regular contributions become
| Contribution | 20 years | 30 years | 40 years |
|---|---|---|---|
| $1,000/mo | $520,927 | $1,219,971 | $2,624,813 |
| $1,500/mo | $781,390 | $1,829,956 | $3,937,220 |
| $2,000/mo | $1,041,853 | $2,439,942 | $5,249,627 |
| $3,000/mo | $1,562,780 | $3,659,913 | $7,874,440 |
All figures assume a 7% nominal annual return compounded monthly. Real returns after inflation are typically closer to 4–5%, so treat these as future dollars rather than today's purchasing power. The mechanics of a monthly contribution stream are worth understanding before relying on any of it.
Where the rule strains
- Retiring early. A 45-year retirement is a very different problem from a 30-year one. Most planners drop to 3–3.5% for horizons that long.
- Sequence-of-returns risk. A severe crash in your first few retired years does far more damage than the same crash later, because you are selling assets while they are down.
- Spending is not flat. Real retirement spending is often high early, lower in the middle, then rises again with healthcare late on.
- Fees compound too. A 1% annual fee across 30 years can consume a meaningful slice of the final balance.
Run your own horizon in the retirement calculator, and check what inflation does to the target using the inflation calculator — a $1.5M goal 30 years out does not buy what $1.5M buys today.
Run your own numbers
FAQ
Is the 4% rule still reliable?
How much should I have saved by 40?
Does Social Security change the target?
What return should I assume?
Should I pay off debt or save for retirement first?
Sources
Primary references used for the figures and rules on this page.
- 401(k) contribution limits — IRS
- Plan for Retirement — Social Security Administration
- Introduction to Investing — U.S. SEC — Investor.gov