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What FIRE is
FIRE is the goal of building enough savings and investments that the income they can generate covers your living costs, so you no longer have to work for money. The retire-early part is optional: many people who reach financial independence keep working, but on their own terms.
At its heart, FIRE is less a single formula than a combination of a high savings rate, low-cost investing, and patience.
The core math
The central number in FIRE is your target portfolio, often estimated as roughly twenty-five times your annual expenses. That multiple comes from the 4 percent rule, the idea that you can withdraw about 4 percent of a portfolio each year with a reasonable chance it lasts decades.
Reaching that number is driven less by investment wizardry than by your savings rate. The larger the gap between what you earn and what you spend, and the more of it you invest in low-cost funds, the sooner you get there.
💡 Savings rate is the main lever:How much of your income you save matters more than chasing high returns. A high savings rate both shrinks the expenses you need to cover and grows the pot faster.
The main variations
FIRE comes in flavors that suit different lifestyles. Lean FIRE aims for a frugal lifestyle on a smaller portfolio, while Fat FIRE targets a larger one to fund higher spending. Coast FIRE means saving enough early that growth alone can carry you to retirement without further contributions, and Barista FIRE blends part-time work with investment income.
These labels simply describe different balances between how much you save, how much you spend, and how much you still want to work.
- Lean FIRE: a frugal lifestyle on a smaller portfolio
- Fat FIRE: a larger portfolio funding higher spending
- Coast FIRE: save enough early, then let growth do the work
- Barista FIRE: part-time work tops up investment income
The honest tradeoffs
FIRE asks a lot. Saving a large share of your income usually requires either a high income, a frugal lifestyle, or both, and the plan rests on assumptions about markets, health, and how long you will live that may not hold. A poor run of early returns can set the timeline back.
It is best understood as disciplined long-term planning rather than a shortcut. You can explore how the numbers might play out with our FIRE calculator, keeping in mind that it shows scenarios, not promises.
Frequently asked questions
What does FIRE stand for?
FIRE stands for Financial Independence, Retire Early. It describes the goal of saving and investing enough that the income from your portfolio can cover your living costs, making paid work optional rather than necessary.
What is my FIRE number?
A common estimate is roughly twenty-five times your annual expenses, which follows from the 4 percent rule. So if you can live on a given amount each year, multiplying it by twenty-five gives a rough target for the portfolio you are aiming to build.
What are the types of FIRE?
Common variations include Lean FIRE (frugal living on a smaller portfolio), Fat FIRE (a larger portfolio for higher spending), Coast FIRE (saving enough early to let growth finish the job), and Barista FIRE (part-time work topping up investment income).
Is FIRE realistic?
It is achievable for some, but it demands a high savings rate, which usually requires strong income, frugal living, or both, plus assumptions about returns and longevity that may not hold. It is best seen as disciplined long-term planning rather than a shortcut.
Related tools and pages
These are for learning. Any calculator here shows example scenarios, not predictions of future prices.
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