Coast FIRE vs Barista FIRE vs Lean FIRE: How to Choose

The FIRE movement long ago split into camps. Lean, Coast, Barista, Fat — each describes a slightly different bet about how much money is enough, and what kind of working life you want on the way there. The vocabulary can feel like jargon, but the underlying choices are simple: how much do you spend, how much do you need invested before you can stop, and how willing are you to keep showing up to a job in the meantime.

This guide cuts through the four. At the end, you should know which milestone you are actually chasing — and, more usefully, when it might be time to switch from one to another.

TL;DR — the four at a glance

Numbers in this table use a 4% safe withdrawal rate and assume retirement at a conventional age. The actual portfolio you need at any moment scales with your real return assumption and your time horizon.

Lean FIRE — retire on less

Lean FIRE is the original purist version. You drive your annual spending down — often to $25,000–$40,000 a year — and use the standard 4% rule to set your target. At $30,000 of annual spending, your Lean FIRE number is $750,000. At $40,000, it is $1,000,000. Once you hit the number, you stop working entirely.

The appeal is speed. Lower spending means a smaller target, and the savings rate it implies is huge — often 50% or more of income. That dramatically compresses the time to financial independence. Mr. Money Mustache, the most-cited Lean FIRE blogger, famously argues a household saving 65% of its income can retire in roughly a decade regardless of starting balance.

The risks are real, though. Lean budgets leave little slack for healthcare in the US, for a partner who wants more, or for the simple drift of expectations upward over decades. Lean FIRE works best for people genuinely happy living on less — not for those forcing it because the math feels exciting.

Coast FIRE — stop saving, keep working

Coast FIRE is the gentlest milestone of the four, and the one this site is built around. At Coast FIRE, you have enough invested that compound growth alone reaches your full retirement target by the time you want to retire. You no longer need to save. You can spend your entire paycheck, switch to a lower-paying job, or take a sabbatical — and still arrive at retirement with a comfortable portfolio.

The math discounts your FIRE number backward to today. If your full FIRE number is $1,000,000, you want to retire at 65, and you assume a 5% real return, then at age 35 you need:

$1,000,000 ÷ (1 + 0.05)^30 ≈ $231,000

Reach $231k by 35, never contribute another dollar, and the portfolio grows into a full $1M (in today's purchasing power) by 65. Reach the same number five years earlier and the target shrinks further.

What makes Coast FIRE distinctive is that it doesn't require you to stop earning. It only requires you to stop saving for retirement. Many people use it as permission to take a lower-stress job, go part-time, become a parent, change industries, or simply enjoy more of what they earn now.

The risk is sequence-of-returns risk. A bad decade early on can pull the portfolio off its trajectory, and the longer your coasting window, the more chance there is for a long flat patch to bite. Many coasters address this by continuing some level of saving even after they technically cross the line — a buffer rather than a strategy.

Barista FIRE — part-time, with benefits

Barista FIRE sits between Lean and Coast. The idea is that you have enough invested to cover most of your expenses, but not all — so you take a part-time job, often for the health insurance and a partial income.

The classic example is the namesake: a Starbucks barista qualifies for company healthcare at 20 hours a week. Plenty of other employers offer benefits at similar thresholds. The point is to escape the 40-hour, full-stress version of work without fully drawing from the portfolio.

A typical Barista FIRE portfolio is 12×–20× annual expenses, depending on how much of the gap the part-time job is expected to cover. For example: $40,000 of annual spending and a $20,000-a-year part-time job means the portfolio only needs to fund $20,000 a year — call it $500,000–$600,000 invested.

The risk people underestimate is the job market itself. The friendly part-time job with benefits is a real thing, but it is not unlimited supply. Healthcare policy changes (especially in the US), employer benefit cuts, or local labor markets can move under you. Barista FIRE works best when your fallback is something you genuinely want to do — teaching, ranger work, a craft — not just whatever pays for benefits.

Fat FIRE — the comfortable version

Fat FIRE is full retirement, but with a generous spending number. If your annual target is $100,000 or more, the 4% rule puts your portfolio target at $2.5 million and up. Households aiming for $150k–$200k of annual spending are looking at $3.75M–$5M invested.

Fat FIRE is the realm of high earners — tech, finance, medicine, founders — and of households unwilling to compromise on lifestyle to retire early. The trade-off is the inverse of Lean: more comfort, more cushion against healthcare and inflation surprises, but a much longer working period.

The risk most often discussed is psychological. The closer you get to the number, the easier it is to keep moving the goal. Just one more good year is a recognizable failure mode. Fat FIRE practitioners often need a stopping rule they actually believe — a date, a milestone, a sabbatical — rather than just a dollar figure.

A decision tree

Use this to triangulate, not as a prescription. Most people slide between two categories before settling.

• If you can genuinely live happily on $30,000–$40,000 a year and want out of full-time work as fast as possible, Lean FIRE is the shortest path.
• If you like (or tolerate) your work but want to stop saving and start enjoying the income you earn now, Coast FIRE is the milestone to hit first. You may never need anything more.
• If you want a low-stress job — ideally one with health insurance — and a part-time income, you are describing Barista FIRE.
• If your spending is comfortably above $80,000 a year and you are not willing to lower it, you are heading for Fat FIRE, whether you call it that or not.

A quieter question hides underneath: do you want to keep working at all? Coast and Barista assume yes, in some form. Lean and Fat assume no. People who answer "no" but are still chasing Coast often burn out before they get there — the milestone is real, but if the goal is full retirement, naming it accurately matters.

When people switch

Movement between the four is the norm, not the exception.

The most common path is Coast → Fat. Someone hits Coast in their mid-thirties, decides they actually enjoy their work, keeps saving anyway, and arrives at a Fat FIRE number a decade earlier than planned. The Coast milestone served as permission to relax, not as a finish line.

A close second is Lean → Coast as life intervenes. The lean budget that worked at 28 starts to feel constraining at 38 — a partner, a child, a relocation. The household raises its spending target and, in doing so, swaps a Lean FIRE plan for a Coast plan. The portfolio is often big enough that this is fine.

Barista → full retirement happens when the part-time gig sours. People discover the "easy" job is still a job, and that the portfolio quietly grew enough during the Barista years to fund a full draw. Many never planned for this outcome but accept it gracefully.

The reverse — full retirement → Barista — is the version that shocks people. A bad market, an unexpected expense, or simple boredom pulls someone back into work after they have already stopped. It is more common than the FIRE community openly discusses, and it is one of the reasons most planners suggest a 3.5% withdrawal rate (or lower) over the traditional 4% for very long horizons.

What this site does

This calculator is built specifically around the Coast FIRE math, because it is the milestone most useful for mid-career savers trying to figure out when they can ease up. The numbers above for Lean, Barista, and Fat are easy to compute — multiply your annual spending by 25 (Lean and Fat) or by some smaller factor (Barista) — but the Coast number changes with every birthday, and the year you cross it depends on your contributions, your real return, and the gap between today and your target retirement date.

Run your own numbers in the calculator. Set your current age, your retirement age, your spending, and your real return assumption. The chart shows the exact year compound growth alone is enough — and how much longer you keep saving changes the picture.