The Number Is About Spending, Not Salary
Ask "how much do I need to retire?" and most advice reaches for salary multiples. But your salary is irrelevant once you stop earning it — what matters is what you spend. A household earning $150,000 and spending $60,000 needs far less than one earning $150,000 and spending $140,000, even though every salary-based rule treats them identically.
The cleanest starting point is the 25x rule:
Retirement number = Annual spending your portfolio must cover × 25
"Must cover" is the key phrase — subtract Social Security, pensions, and any other reliable income first.
Where 25x Comes From
The 25x rule is the inverse of the 4% guideline, drawn from historical studies of U.S. market returns (the best known being the Trinity Study). Withdrawing 4% of a diversified portfolio in the first year of retirement, then adjusting that dollar amount for inflation annually, survived every historical 30-year retirement period tested — including ones that began right before crashes and depressions.
4% per year means you need 1 ÷ 0.04 = 25 times your annual withdrawal. It's a planning benchmark, not a law of nature: retirements longer than 30 years, or more conservative assumptions, argue for 3–3.5% withdrawals (28–33x). Flexibility — the willingness to trim spending in bad market years — improves the odds more than almost any other factor.
What It Looks Like in Dollars
Suppose Social Security will cover $24,000/year of your retirement:
| Annual spending | Portfolio must cover | 25x target |
|---|---|---|
| $50,000 | $26,000 | $650,000 |
| $60,000 | $36,000 | $900,000 |
| $80,000 | $56,000 | $1,400,000 |
| $100,000 | $76,000 | $1,900,000 |
Notice the leverage in spending: cutting planned retirement spending by $10,000/year shrinks the target by $250,000. Knowing your real annual spending — most people guess wrong until they track it — is worth more than any investment optimization.
Are You on Track? Benchmarks by Age
A widely used set of checkpoints (popularized by Fidelity) measures savings as a multiple of your salary:
- 30: 1× salary saved
- 40: 3× salary
- 50: 6× salary
- 60: 8× salary
- 67: 10× salary
These assume roughly a 15% savings rate sustained from your mid-20s and standard retirement timing. They're rough — a frugal household can retire comfortably below them, a high spender needs more — but being far behind a checkpoint is a useful early warning while there's still time to act.
If You're Behind: The Levers, Ranked
1. Capture your full employer match. A 50–100% instant return, before any market growth. This is always first.
2. Raise your savings rate on a schedule. Increase contributions by 1% of salary every year or with every raise. Going from 6% to 15% overnight hurts; getting there over five years is barely noticeable.
3. Give the money more years. Each additional working year helps three ways at once: one more year of contributions, one more year of growth, and one less year of withdrawals. Retiring at 67 instead of 62 can cut the required portfolio dramatically.
4. Use catch-up contributions. Savers 50 and older get higher 401(k) and IRA limits — significant extra tax-advantaged room exactly when careers tend to peak.
5. Rethink the spending side. A paid-off mortgage before retirement, or relocating somewhere cheaper, attacks the 25x math directly.
What the Rule Doesn't Capture
The 25x rule sizes the target; it doesn't manage the journey. Sequence-of-returns risk (a crash in your first retirement years does outsized damage), healthcare before Medicare at 65, long-term care, and taxes on withdrawals all deserve attention as you get close — and are good reasons to review a real plan with a licensed advisor rather than retiring on a rule of thumb alone.
Key Takeaway
Track what you actually spend, subtract guaranteed income, multiply by 25 — that's your working target. Then let a projection show whether your current balance and monthly contributions get there by your intended age, and adjust the levers while time is still doing the heavy lifting.