FIRE stands for Financial Independence, Retire Early. The idea is simple: save and invest enough that your investments can pay for your life indefinitely. Once you get there, work becomes optional.
That point is called financial independence. Retiring early is what some people do with it. Others keep working, but on their own terms: a different career, fewer hours, or a passion project that pays less.
Your FIRE number
Your FIRE number is the size of portfolio you need to cover your spending without running out. The simplest version uses the 4% rule:
If you spend $40,000 a year, your basic FIRE number is $1,000,000. Spend $60,000 and it's $1,500,000.
Notice what drives it: spending, not income. Two people earning the same salary can have very different FIRE numbers because one lives on $35,000 and the other on $90,000.
What the simple version leaves out
The ×25 shortcut is a good first estimate, but it skips three things that matter for early retirees:
- Taxes on withdrawals. Money in a Traditional 401k or IRA is taxed when you take it out, so you need to withdraw more than you spend.
- Health insurance before Medicare. If you retire before 65, you pay for your own coverage until Medicare starts.
- A longer retirement. The 4% rule was tested over 30-year periods. Retiring at 40 could mean 50 years, so many early retirees use a more cautious 3.25–3.5%.
Our calculator adds the first two to your number automatically and lets you choose the withdrawal rate.
Why your savings rate matters most
Your savings rate, the share of your take-home pay you invest, does two jobs at once. It grows your portfolio faster, and it lowers the spending your portfolio has to cover. That double effect is why it's the biggest lever you have.
| Savings rate | Years to financial independence |
|---|---|
| 10% | 52 years |
| 20% | 37 years |
| 30% | 28 years |
| 40% | 22 years |
| 50% | 17 years |
| 60% | 13 years |
| 70% | 9 years |
Starting from $0, investing at a 5% return after inflation, spending everything you don't save, and retiring at 25× spending.
Going from 10% to 20% cuts 15 years off the timeline. Going from 20% to 40% cuts another 15. Your income doesn't appear in the table at all: these timelines hold whether you earn $50,000 or $250,000.
The types of FIRE
FIRE isn't one destination. People usually describe their goal with one of these labels:
- Lean FIRE: financial independence on a modest budget, often well below the average household's spending.
- Fat FIRE: a larger portfolio that supports a comfortable or generous lifestyle, with more room for travel and surprises.
- Coast FIRE: you've invested enough that growth alone will reach your full number by a normal retirement age. You only need to earn enough to cover today's bills.
- Barista FIRE: you leave full-time work early and use part-time income to cover part of your spending, so the portfolio can be smaller.
How to get started
- Know your spending. Add up a year of real spending. This number drives everything else.
- Capture free money first. Contribute enough to get any employer 401k match.
- Clear high-interest debt. Paying off a 24% credit card is a guaranteed 24% return.
- Use tax-advantaged accounts. 401ks, IRAs and HSAs cut your taxes now or later. In 2026 you can put up to $24,500 in a 401k and $7,500 in an IRA, with higher limits from age 50.
- Invest simply and consistently. Most FIRE followers use low-cost, broad index funds and automate their contributions.
- Raise your savings rate over time. Save a large share of every raise instead of spending it.
If you plan to stop working before 59½, also plan how you'll reach your money, since most retirement accounts charge a 10% penalty for early withdrawals. Our guide on using retirement money before 59½ covers the main options.
Common questions
Do I have to retire early to do FIRE?
No. Many people use FIRE to reach the point where work becomes optional, then keep working on their own terms, switch careers, or go part-time. The "RE" is a choice, not a requirement.
How much money do I need for FIRE?
A common starting point is 25 times your yearly spending, which comes from the 4% rule. Someone spending $40,000 a year would need about $1 million. Early retirees often aim higher to cover taxes, health insurance and a longer retirement.
Is FIRE only for high earners?
No. A high income helps, but the timeline depends mostly on the share of income you save. Someone who saves 50% of a modest income can reach FIRE faster than a high earner who saves 10%.
This guide is for education, not personal financial or tax advice. Examples use simplified assumptions, such as a steady 5% return after inflation, that real markets won’t follow. Tax figures are for the 2026 tax year.