Your FIRE Number
The simple 25x-expenses target, and how your savings rate sets the years to reach it.
Your “FIRE number” is the corpus at which you’re financially independent — the amount whose investment returns can sustainably cover your annual expenses. The classic rule of thumb is beautifully simple: 25 times your annual expenses.
The 25× target comes straight from the 4% rule (25 = 1 ÷ 0.04): if you can sustainably withdraw ~4% a year, then a corpus of 25× your annual expenses can fund them indefinitely. The profound implication is that *your FIRE number is driven by your expenses, not your income — which means there are two levers to reach it, and the lower-expense one is doubly powerful. Spending ₹6 lakh/year? Your FIRE number is ~₹1.5 crore. Spending ₹24 lakh/year? It balloons to ~₹6 crore. So cutting your expenses does double duty: it shrinks the target corpus and* raises your savings rateThe share of your income you save and invest. (more left over to invest) — a powerful flywheel. This reframes FIRE from “earn a fortune” to “design a life whose costs your corpus can cover” — and it’s why frugality, not just high income, is central to the FIRE math. (Use *inflated, futureA binding agreement to buy or sell at a set price on a future date.* expenses and the same 4%-rule caveats from the retirement module — for long/early retirements, a more conservative ~30× may be safer.) Know your number, and you know exactly what you’re aiming at.
- The rule — FIRE number ≈ 25× your annual expenses (the inverse of the 4% withdrawal rule).
- Driven by expenses, not income — lower spending shrinks the target and raises your savings rateThe share of your income you save and invest. (double benefit).
- Reframes FIRE — “design a life your corpus can cover,” not “earn a fortune”; frugality is central to the math.
- Caveats — use inflated/futureA binding agreement to buy or sell at a set price on a future date. expenses; for long or early retirements consider a safer ~30× (the 4%-rule limits apply).
ExampleAnnual expenses of ₹6 lakh → FIRE number ≈ ₹1.5 crore (25×). If you trim your lifestyle to ₹4.8 lakh/year, the target drops to ₹1.2 crore and you free up more to invest — reaching it far sooner. A high earner spending ₹24 lakh/year needs ~₹6 crore. Same rule; the expense level set the whole game.
Key takeawayYour FIRE number ≈ 25× annual expenses (from the 4% rule). Crucially it’s driven by expenses, not income — so cutting spending shrinks the target and raises your savings rateThe share of your income you save and invest., a double benefit. Use inflated futureA binding agreement to buy or sell at a set price on a future date. expenses (and consider ~30× for long/early retirements). Know your number to know your target.
FAQs
Is 25× enough, or should I aim higher?
For a standard ~30-year retirement, 25× (the 4% rule) is a reasonable baseline — but for *early* retirement (a 40+ year horizon) or in higher-inflation India, a more conservative target like 30–33× (≈3–3.3% withdrawal) gives a bigger safety margin. Also base it on *inflated future* expenses, not today’s. When in doubt, aim a bit higher — overshooting is far safer than running out.