FIRE — Financial Independence, Retire Early — comes down to one question: how big a corpus lets you stop depending on a salary, permanently? The math is simpler than the lifestyle changes it usually requires.
📖 6 min readFinancial Independence means having enough invested assets that the returns (or a planned drawdown) can cover your living expenses indefinitely, without needing employment income. "Retire Early" is the popular framing, but the core idea — financial independence — is useful even for people who don't plan to stop working; it just means work becomes optional.
The most common approach sizes your FIRE corpus using a safe withdrawal rate (SWR) — the percentage of your corpus you can withdraw each year, adjusted for inflation, with a low risk of running out of money over a long retirement. A widely cited starting point is 4% a year, though many planners in India suggest something more conservative (3–3.5%) given India's typically higher inflation and the longer retirement horizons that come with early retirement.
Your FIRE number is simply your desired annual expense divided by the SWR — for example, ₹12,00,000 a year in expenses at a 4% SWR implies a corpus of ₹3,00,00,000 (₹12,00,000 ÷ 0.04).
Because FIRE is usually a decade-plus goal, today's expenses aren't the number that matters — your expenses at the point you actually retire are, inflated forward from today. Underestimating inflation is one of the most common FIRE-planning mistakes, since even a modest gap between assumed and real inflation compounds significantly over 15–20 years.
The corpus itself also needs to keep growing after you stop working (through continued, typically more conservative, investment) to sustain withdrawals through a retirement that, for an early retiree, could easily run 40–50 years.
The 4% rule originates from US market data and a roughly 30-year retirement horizon. India's higher long-term inflation and the longer horizon implied by "retiring early" both argue for more caution — many Indian FIRE planners use 3–3.5% instead of 4% to build in a bigger safety margin.
It should. A FIRE number built only from today's current lifestyle expenses, without separately budgeting for rising healthcare costs as you age and general inflation over a long retirement, tends to be understated. Build both into your expense estimate before applying the withdrawal rate.
Mechanically, very little — both size a corpus from expected expenses and a withdrawal rate. The difference is mainly timeline and required savings rate: FIRE targets a much earlier retirement age, which means a shorter accumulation window and a longer withdrawal window, so it typically demands a higher savings rate today.
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