Coast vs Barista vs Lean vs Fat FIRE
"FIRE" isn't one thing. The five flavours below trade off how much you save, how soon you stop, and how much you spend. Here's how they compare, and a calculator for each.
| Type | The idea | Still working? | Portfolio needed | Calculator |
|---|---|---|---|---|
| Coast FIRE | Save enough early, then stop saving and let it grow. | Yes, full-time, covering today's costs. | Smallest | Coast FIRE → |
| Barista FIRE | Part-time income covers part of your spending; the portfolio covers the rest. | Yes, part-time (often for benefits). | Low–medium | Barista FIRE → |
| Lean FIRE | Fully retire on a deliberately minimalist budget. | No. | Lower full number | Lean FIRE → |
| Full FIRE | Fully retire on a normal, comfortable budget. | No. | Standard | FIRE number → |
| Fat FIRE | Fully retire on a generous, no-compromises budget. | No. | Largest | FIRE number → |
Which FIRE is right for you?
Choose Coast FIRE if you like (or don't mind) your job but want to kill the pressure of aggressive saving as early as possible. It's the easiest milestone to reach and it buys immediate peace of mind, you keep working, but only to cover today, not tomorrow.
Choose Barista FIRE if you want to downshift now, fewer hours, a lower-stress role, or self-employment, and you're happy for part-time income (especially one with health benefits) to bridge the gap. It needs more than Coast FIRE but far less than full retirement.
Choose Lean FIRE if you value time over stuff and can happily live on a modest budget. Lower spending is the single biggest lever on how soon you can fully retire.
Choose Full or Fat FIRE if you want to fully stop working with a normal or generous lifestyle and are willing to save longer to get the larger portfolio it requires.
The one number they all share
Every type starts from your FIRE number, annual spending ÷ your withdrawal rate. Coast and Barista just discount or offset it. Get that number right first, then pick the path that fits your life.
A quick decision guide
- Is the problem your job, or the saving pressure? If it's the pressure, Coast FIRE solves it soonest. If it's the job itself, you need Barista, Lean or full FIRE, something that changes your working week, not just your savings rate.
- Would you happily work 15-20 hours in a low-stakes role? Yes → Barista FIRE cuts your target dramatically. No → you're choosing between Lean and full FIRE.
- Could you genuinely live on a modest budget for decades? Yes → Lean FIRE brings the finish line years closer. No, or not sure → price full FIRE honestly rather than betting your future on a budget you've never tested.
- Do you want zero compromise on lifestyle? Then you're pricing Fat FIRE, and the honest trade is more working years in exchange for more spending forever.
The same $40,000 spender, four ways
Numbers make the trade-offs concrete. Take one person who spends $40,000 a year, uses the 4% rule, and is 35 planning to retire at 65:
| Strategy | What changes | Portfolio needed |
|---|---|---|
| Full FIRE | Nothing, the portfolio funds all $40,000. | $1,000,000 |
| Lean FIRE | Trims spending to $30,000 a year. | $750,000 |
| Barista FIRE | Part-time work brings in $20,000; the portfolio funds the other $20,000. | $500,000 |
| Coast FIRE | Keeps working to 65; the portfolio just has to grow into $1,000,000 on its own. | ~$230,000 today (at a 5% real return over 30 years) |
Same person, same lifestyle, and the bar ranges from about $230,000 to $1,000,000. The strategy you pick matters as much as how much you save, which is why it's worth running your own figures through the Barista and Lean calculators before committing to the biggest target by default.
Combining strategies, the realistic path
In practice these aren't four doors, they're one road with exits. A common sequence: save hard in your 20s and early 30s until you pass Coast FIRE, then downshift into a Barista-style role while the portfolio compounds. Because you're still earning something, the portfolio keeps growing untouched, and somewhere in your 50s it quietly crosses your full FIRE number. You never made one dramatic leap, yet you spent twenty years working less than you otherwise would have.
Mixing also de-risks the lean path: a lean budget plus a little part-time income means your portfolio covers a gap so small that even bad market years are survivable. The strategies stack, discount your target with time (Coast), income (Barista), or spending (Lean), and you can apply more than one discount at once.
Frequently asked questions
Can I switch between FIRE types later?
Yes, and most people do. The types are checkpoints on one continuum, not separate tracks. A portfolio that puts you at Coast FIRE today grows into Barista territory, then Lean, then full FIRE, without you changing anything except how much work you choose to do along the way.
Which type of FIRE is fastest to reach?
Coast FIRE, by a wide margin, because compounding does most of the work and you only need the seed capital, see the by-age table for how small the early targets are. Barista FIRE comes next since part-time income offsets a big share of spending. Lean FIRE beats full FIRE by shrinking the budget itself, and Fat FIRE takes longest of all.
Do Coast and Barista FIRE use the same FIRE number?
They start from the same full FIRE number, annual spending divided by withdrawal rate, but discount it differently. Coast discounts it for time, asking what seed grows into it by retirement. Barista discounts it for income, asking what portfolio covers spending after part-time earnings. That's why the two figures differ even for the same person.