How Much Do You Need to Retire?

The most useful answer fits in one line: you need about 25 times your planned annual spending, minus what guaranteed income (state pension or Social Security, any employer pension) will cover. Someone spending $60,000 a year with $24,000 of expected Social Security needs to fund $36,000 from savings — a target of roughly $900,000, not the scary multi-million figure headlines quote.

Why 25×? The 4% rule in one paragraph

The 25× target is the 4% rule inverted. Historical studies of US market data (the Trinity study and its successors) found that withdrawing 4% of a balanced portfolio in year one, then adjusting for inflation annually, survived at least 30 years in the overwhelming majority of historical periods. Spending ÷ 4% = spending × 25. It's a planning guideline calibrated to ~30-year retirements — not a law, and not a guarantee — but it remains the best simple anchor available, with adjustments below for early retirement and bad luck.

The target table

What savings different spending levels require, before subtracting guaranteed income (4% rule, with the conservative 3.5% figure for comparison):

The single most powerful lever is visible right in the table: every $1,000 of annual spending you don't need cuts the target by $25,000. Downsizing, a paid-off mortgage (see what it takes), and lower fixed costs do more than chasing higher returns ever will.

Subtract guaranteed income first

The 25× multiple applies only to spending your portfolio must cover. The average Social Security retirement benefit replaces roughly $20,000–$25,000/year for a typical earner; the UK full new State Pension is around £12,000/year; Canada's CPP+OAS and Australia's Age Pension play similar roles. Two adjustments matter:

• Timing: benefits start in your 60s. Retire before that and the portfolio carries full spending during the "bridge years" — count those separately.
• Claiming age: delaying Social Security from 62 to 70 raises the check by ~77%. For long-lived households the delay is usually the better deal.

What spending will you actually have?

Estimate retirement spending from your current spending, then adjust: subtract retirement contributions themselves, work costs, and (ideally) the mortgage; add healthcare — the line that rises most, and in the US can run $5,000–$10,000+/year per person before Medicare; keep travel and hobbies honest, since early retirement years usually spend more on living, not less. Most people land between 70% and 90% of pre-retirement spending. If you've never measured spending, that's step zero — the net worth tracker plus three months of statements gets you a real number.

Retiring early changes the rule

The 4% rule was tested on ~30-year horizons. Retire at 50 or 55 and the money may need to last 40–45 years, which argues for a 3.25–3.5% initial withdrawal rate — i.e., ~28–30× spending instead of 25×. Browse the pre-computed scenarios to see what different nest eggs support: retiring at 55 with $1M, at 60 with $750k, or at 62 with $500k. The full early-retirement framework — savings rates, the years-to-FI math — is in the FIRE guide and the FIRE calculator.

The two big risks the simple math hides

• Sequence-of-returns risk. A deep bear market in the first five years of withdrawals does damage that average returns never repair, because you're selling more shares at low prices. Defenses: a 1–3 year cash/bond buffer, flexible spending (skip the inflation raise in bad years), or starting at 3.5%.
• Inflation. The rule's withdrawals rise with inflation, but your personal inflation (healthcare again) can outrun CPI. See how inflation compounds against you — at 3%, spending needs double in 24 years.

Turning the target into a monthly number

Suppose you're 35 with $100,000 saved and a $1,200,000 target at 67. At a 7% average return, you need roughly $850/month of contributions — before counting any employer match, which typically covers a third of that. The retirement calculator solves this for your exact numbers, and the saved-by-age benchmarks tell you whether you're pacing. The pattern to internalize: the target is big, the monthly number usually isn't — provided it starts early and runs on automatic.

The bottom line

Planned spending × 25, minus guaranteed income, stretched toward 28–30× if you're retiring well before 60. Spend less to need dramatically less; mind the first five years of withdrawals; and convert the whole thing into one automated monthly contribution — that's the entire game.