How Much Do I Need to Retire? The 4% Rule, Real Numbers and Why 10× Your Salary Is a Rough Guess
The 4% rule explained with worked examples, how much you need at 60 vs 65, what Social Security changes, and why your retirement number is smaller than the scary headlines suggest.
Retirement math has a reputation for being terrifying, and most of that reputation comes from one bad habit: quoting a total savings number — “$1.8 million!” — as if it applied to everyone. Your real number depends on when you retire, what you’ll spend, and one rule of thumb that has survived 30 years of market history better than any headline.
The 4% rule, in plain English
The rule comes from the 1994 “Trinity Study,” which back-tested US stock and bond portfolios from 1926 onward and asked: what percentage could retirees withdraw each year (adjusted for inflation) without running out of money over a 30-year retirement? The answer, for a balanced portfolio, was about 4%.
Flip it around and you get the famous formula:
Retirement number ≈ 25 × your annual spending
Spend $60,000 a year? You need about $1.5 million. Spend $45,000? $1.125 million. The number is driven almost entirely by spending, not income — nobody retires on their salary, they retire on their habits.
Here’s the part the scary headlines leave out: Social Security. If a couple expects $3,000/month combined from Social Security, that’s $36,000 a year their portfolio never has to produce — cutting the required savings from $1.5 million to roughly $600,000. The 4% rule applies to what your portfolio must cover, not your total budget.
Model your own trajectory with the Retirement Calculator, which applies today’s-dollar conversion and a 4% income check automatically.
What the milestones should look like
Fidelity’s widely cited guideline says your savings should be a multiple of your salary by certain ages:
| Age | Savings target (× salary) | Example at $80,000 salary |
|---|---|---|
| 30 | 1× | $80,000 |
| 35 | 2× | $160,000 |
| 40 | 3× | $240,000 |
| 45 | 4× | $320,000 |
| 50 | 6× | $480,000 |
| 55 | 7× | $560,000 |
| 60 | 8× | $640,000 |
| 67 | 10× | $800,000 |
These assume retirement at 67 and include 401(k)s, IRAs and employer matches — but not your home equity. If you’re behind a milestone, don’t panic; run the actual projection, because compounding does strange and wonderful things in the last decade.
The 25× math, worked out
Let’s model a realistic saver: age 30, $50,000 already saved, contributing $500/month, earning 7% a year (a standard long-run assumption for a stock-heavy portfolio, before inflation):
- Nominal balance at 65: about $1.48 million
- In today’s dollars (3% inflation, 35 years): about $524,000
- 4% income in today’s terms: about $1,750/month, or $21,000/year
Now the realistic interpretation: that $21,000/year from the portfolio, plus Social Security (say $24,000/year for a median earner), covers a $45,000/year lifestyle in today’s money. So for this saver, $500/month roughly funds a modest-but-real retirement. That’s the honest way to do this math — in today’s dollars, against today’s spending.
Every extra $100/month at the same assumptions adds roughly $180,000 nominal to the ending balance. Time matters more than the amount: starting at 25 instead of 35 produces about 45% more wealth with the identical contributions.
Retire at 60 vs 65: a $400,000 difference
Retiring five years early is brutal on the math, from three directions at once:
- Five fewer contribution years — usually the highest-balance ones.
- Five more withdrawal years — the number 25× assumes 30 years of retirement; retire at 60 and many planners use 3–3.5%, i.e. 29–33× spending instead.
- Five years before Medicare — bridging health insurance from 60 to 65 can cost $800–$1,500/month per person.
A $60,000/year spender who retires at 65 needs about $1.5 million. The same person retiring at 60 needs closer to $1.8–2 million plus a health-bridge fund. Early retirement is absolutely possible — but it’s a different arithmetic, not the same one with nicer numbers.
Four things that break (or fix) the 4% rule
- Sequence of returns. A market crash in your first two retirement years hurts far more than the same crash in year 20, because you’re withdrawing from a shrunken portfolio. Most retirees soften this with 1–2 years of cash reserves.
- Longevity. A 30-year horizon covers retirement to age 95. Half of 65-year-olds will outlive that. Couples should plan jointly, since one spouse likely lives longer than the average.
- Early retirement. Every decade you shave off pushes the safe rate down toward 3–3.5% — which is why FIRE communities talk about saving 30–40× expenses.
- Part-time income. Earning even $15,000/year for your first five retired years cuts the required portfolio by roughly $375,000. “Barista FIRE” isn’t a joke; it’s leverage against sequence risk.
If you’re behind, in order of leverage
- Capture the full employer match — an instant 50–100% return on those dollars. Nothing else compares.
- Raise contributions by 1% a year — painless now, decisive later; automate it.
- Delay Social Security to 70 — benefits grow about 8% per year of delay past full retirement age, the best inflation-protected annuity you can buy.
- Trim the retirement budget by $500/month — every $6,000/year of spending you remove lowers your target by $150,000. Spending cuts beat income raises at a 25-to-1 ratio.
FAQ
Is the 4% rule still valid? Its creator and subsequent research suggest 4% remains a reasonable starting rate for a 30-year retirement in a diversified portfolio, with 4.5–5% defensible in favorable conditions and 3–3.5% for early retirees. It’s a planning anchor, not a guarantee — review annually.
Does the 25× rule include Social Security? No — and that’s the most common way people overshoot their target. Multiply only the spending your portfolio must cover, after subtracting Social Security, pensions and any rental income.
Should I count my house? Generally no for the 25× math, since you’ll live in it. But downsizing at retirement can release equity that acts as a one-time withdrawal, and a paid-off house effectively reduces your spending number by the rent you no longer pay.
What’s a realistic rate of return to assume? 7% nominal (about 10% nominal minus inflation smoothing) for a stock-heavy portfolio over 30+ years is the standard planning assumption. Assuming 10% flat is how projections end up 40% too rosy.