FIRE variants: Lean, Fat, Coast, Barista
Different flavours of financial independence and what they mean for your plan.
“FIRE” sounds like one destination, but the community splits it into several distinct variants — Lean, Fat, Coast, Barista — and they aren’t marketing labels. Each one is the same underlying math (the 4% rule) run with a different assumption plugged in, either about how much you plan to spend or how much you’re still willing to work.
The four flavours of FI
| Variant | What changes |
|---|---|
| Lean FIRE | A minimal, tightly-budgeted post-FIRE lifestyle — smaller required corpus, reachable sooner. |
| Fat FIRE | A comfortable, unconstrained post-FIRE lifestyle — much larger required corpus, takes longer. |
| Coast FIRE | You’ve already saved enough that compounding alone — with zero further contributions — reaches your full number by a normal retirement age. You still work to cover today’s expenses, just not to save more. |
| Barista FIRE | A partial corpus covers only part of your expenses; light part-time work (the name comes from taking a low-stress job, often for benefits) covers the rest. |
Lean vs. Fat: the expense lever
Lean and Fat FIRE are the simplest variants — nothing changes about the formula, only the monthly expense figure you plug in. Since required corpus scales directly with expenses, the gap between them is large.
Using the real computeFire formula with identical savings and contribution assumptions (₹15,00,000 current savings, ₹15,000/month SIP, 12% expected return, starting at age 30): a Lean budget of ₹35,000/month reaches FIRE at age 53 needing a ₹4,01,07,371 corpus. The traditional ₹60,000/month budget reaches FIRE later, at age 61, needing ₹10,95,85,812. A Fat ₹1,20,000/month budget pushes FIRE out to age 73, needing ₹44,10,16,367 — over 10x the Lean corpus, purely from the monthly spending assumption.
Find the age you could financially retire based on your savings rate.
Coast and Barista: the work lever
Coast and Barista FIRE change a different variable: how much you’re still willing to work, rather than how much you spend.
Coast FIREasks a different question than “when can I stop working” — it asks “when can I stop saving?” The corpus needed at a normal retirement age, discounted back to today at your expected return, is the number you need to already have banked.
For a 30-year-old planning to retire traditionally at 55 on ₹60,000/month (inflation-adjusted, 6% inflation), a 4% withdrawal rate, and a 12% expected return, the corpus required at 55 works out to ₹7,72,53,673. Discounted back 25 years at 12%, that means having ₹45,44,316 saved today is enough to Coast — no further contributions required, ever, for that goal. The calculator’s own default of ₹15,00,000 in savings at 30 is ₹30,44,316 short of that, which is exactly why it still shows a monthly SIP as necessary.
Barista FIREtakes a different shortcut: instead of a corpus covering 100% of monthly expenses, it only needs to cover whatever part-time or low-stress work income doesn’t. If part-time work reliably covers half of a ₹60,000/month budget, the corpus only needs to replace the other ₹30,000/month — using the same formula on a lower number, the required corpus drops to ₹2,88,64,219 and FIRE becomes reachable at age 50 instead of 61 for full retirement.
None of these are separate calculators or separate formulas — they’re the same 4% rule math, run with the monthly-expense and contribution assumptions that actually match your plan.
All figures are indicative and for educational purposes only — not financial advice.
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