Coast FIRE, Lean FIRE and Fat FIRE are variations on the same idea, financial independence, that differ in how much you spend and when you stop saving. Coast FIRE is the standout: it means you have invested enough early that your corpus should grow to your retirement number by the normal retirement age on its own, without a single further contribution. You keep working only to cover today's bills.
They sound like jargon, but each variant answers a real question about lifestyle and timing.
The variants at a glance
What is Coast FIRE?
Coast FIRE is the point at which your existing investments, left completely alone, are projected to grow into your full retirement number by the time you reach a normal retirement age. From that point you are "coasting": compounding carries the corpus the rest of the way, and you no longer need to save for retirement.
You still work, but only to fund your current lifestyle, not to build the retirement pot. This is the appeal. Hit Coast FIRE early and the pressure to keep stuffing money into retirement accounts lifts, freeing income for other things or a lower-paid job you prefer.
The reason Coast FIRE is reachable at all is that the early years of investing carry the most weight. A sum invested at 30 has three decades to compound, and in a long runway the later doubling periods add the largest amounts. So a moderate corpus built young can, in principle, grow into a much larger one by 60 with no further help. The younger you are when you get there, the smaller the corpus you need, because compounding has more time to do the rest.
Lean FIRE and Fat FIRE
Lean and Fat are about the size of the life you are funding.
- Lean FIRE aims at a frugal, low-cost retirement. Because the annual expenses are small, the target corpus is smaller too. It suits people comfortable with a simple lifestyle and willing to keep spending tight.
- Fat FIRE aims at a comfortable or even lavish retirement, with room for travel, a bigger home and discretionary spending. Higher expenses mean a much larger corpus is required.
Both use the same expenses-times-a-multiple logic covered in your FIRE number. Only the expense figure changes, and that changes everything downstream.
Barista FIRE
Barista FIRE sits between working full-time and full independence. You build a partial corpus, then cover the remaining expenses with part-time or lighter work. The name nods to taking a casual job, sometimes for the benefits, while your investments handle the rest.
It is a pragmatic middle path. You get much of the freedom of FIRE without needing to reach the complete number first, and the ongoing income reduces how hard your corpus has to work.
How Coast FIRE works, illustratively
The Coast idea rests on a projection, so here is an illustrative one. The assumptions are stated and the figures are examples, not forecasts.
| Input (illustrative) | Value |
|---|---|
| Age today | 30 |
| Target retirement age | 60 |
| Assumed annual growth | ~10% a year, illustrative |
| Corpus needed at 60 | your FIRE number |
If the corpus you already hold at 30, growing untouched for 30 years at your assumed rate, is projected to reach your FIRE number, you have hit Coast FIRE. The earlier you front-load the investing, the more years compounding has to work, which is why Coast is easiest to reach young. A FIRE calculator lets you run the projection with your own inputs.
How Coast FIRE works
- Early yearsInvest hard, front-load the corpus
- Coast pointEnough invested to reach your number
- CoastingStop saving for retirement; work covers today
- ~60Corpus has compounded to the target
- Early yearsInvest hard, front-load the corpus
- Coast pointEnough invested to reach your number
- CoastingStop saving for retirement; work covers today
- ~60Corpus has compounded to the target
Which variant fits you?
There is no correct choice, only a matched one. Lean suits frugal minimalists, Fat suits those who want a fuller retirement and can fund it, Coast suits people who invested hard early and want to ease off, and Barista suits those who want partial freedom now. Many people move between them as income and priorities shift.
Related NYVO guides
- Your FIRE Number: How Much Is Enough? – the target every variant is measured against.
- FIRE: Financial Independence, Retire Early, in India – the movement and its savings-rate maths.
- Retirement Planning in India: A Beginner's Guide – the broader plan these variants refine.
The variants are really one question asked four ways: how much do you want to spend, and how soon do you want to stop saving for it? Coast FIRE is the most useful reframe, because it shows that the early years of investing, not the last ones, do most of the work.
