FIRE vs Coast FIRE: Which Strategy Is Right for You?

Financial independence is the destination. But how you get there — and how quickly — depends enormously on which FIRE strategy you choose. Two of the most popular approaches share the same end goal but diverge dramatically in their methods: full FIRE and Coast FIRE.

Understanding the difference isn't just academic. Choosing the wrong strategy for your personality, income, and life situation could mean years of unnecessary sacrifice — or years of unnecessary delay. This article breaks down both, compares them head-to-head, and helps you figure out which one actually fits.

Full FIRE: The Complete Picture

Full FIRE — often just called "FIRE" — means accumulating a portfolio large enough to fund your retirement entirely from investment returns, with no need for any earned income. The standard benchmark is the 4% rule: your portfolio should be 25 times your annual spending.

If you spend $5,000/month ($60,000/year), your full FIRE number is $1.5 million. When you hit that number, you're done. You can stop working entirely. Your portfolio, invested in diversified index funds, generates enough in returns and dividends to sustain your lifestyle indefinitely — at least based on 30 years of historical market data.

Full FIRE requires aggressive saving — typically 40–70% of income — to reach that number quickly enough to retire in your 40s or even 30s. It demands significant sacrifice during accumulation and total financial independence at the end.

Coast FIRE: The Coasting Approach

Coast FIRE is different in one critical way: the accumulation phase ends early, and compound interest does the rest of the work. Once you've saved enough that your existing portfolio will grow to your full FIRE number by your target retirement age — without any further contributions — you've reached Coast FIRE.

At that point, you only need to earn enough to cover your current living expenses. You stop saving for retirement. The market takes it from there.

Side-by-Side Comparison

Factor	Full FIRE	Coast FIRE
Goal	Fully funded now — stop working entirely	Accumulation done — still work to cover expenses
Required savings rate	40–70% (aggressive)	20–40% in early years, then drops to 0%
Timeline to stop saving	Same as retirement date	Often 5–15 years earlier than retirement
Work after milestone	Optional — fully retired	Required to cover living expenses (not saving)
Lifestyle during accumulation	Often severely restricted	Can be near-normal after Coast milestone hit
Retirement date	When FIRE number is hit	Predetermined target age (e.g., 60)
Income risk	None after FIRE	Must remain employable during coast period
Best for	High earners wanting early total freedom	People who want relief from saving pressure sooner

Real Examples of Each

Full FIRE: Maya's Story

Maya, 32, earns $180,000 as a product manager in San Francisco. She spends $72,000/year and saves 60% of her income — about $108,000/year. Her FIRE number is $1.8 million (72,000 × 25).

Starting with $200,000 already saved, Maya reaches $1.8 million in approximately 9 years at 7% returns. She retires fully at 41. No more income needed, ever. Total freedom, but nine years of intense frugality in one of the world's most expensive cities.

Coast FIRE: James's Story

James, 30, earns $95,000 as a teacher in Denver. He spends $42,000/year and has been saving aggressively for five years — he currently has $145,000 invested. His full FIRE number is $1.05 million. He wants to retire at 60.

At 7% returns, $145,000 grows to $1.05 million in approximately 31 years — precisely when he turns 61. James has already hit his Coast FIRE number. He can stop contributing to his retirement accounts today and simply cover his living expenses with his teaching salary until retirement.

James doesn't have to sacrifice anything more. He can take the international trip he's been delaying, help his sister with a loan, or simply enjoy his salary instead of funneling it into index funds. The compound interest machine is already running.

Who Should Choose Full FIRE?

Full FIRE is the right call if you:

• Have a high income that makes aggressive saving feasible without extreme sacrifice
• Want to stop working entirely as early as possible (your 30s or 40s)
• Dislike your work enough to make short-term sacrifice worth long-term total freedom
• Have no interest in working part-time or having any earned income in retirement
• Have a lean-to-moderate lifestyle that doesn't require a huge portfolio

Who Should Choose Coast FIRE?

Coast FIRE makes more sense if you:

• Started saving early and already have a meaningful portfolio building momentum
• Enjoy your work, or at least don't hate it enough to sacrifice everything to escape it
• Want to relieve the psychological pressure of aggressive saving without fully stopping
• Plan to retire around 55–65 rather than in your 30s or 40s
• Value lifestyle quality during your working years as much as early retirement

How to Calculate Your Coast FIRE Number

1. Determine your full FIRE number — annual spending × 25
2. Choose your target retirement age — the age when you want to stop working entirely
3. Calculate years remaining — target retirement age minus current age
4. Apply the formula: Coast number = FIRE number ÷ (1.07)^years remaining

Example: FIRE number $1.2M, retire at 62, currently 38 (24 years): $1,200,000 ÷ (1.07)^24 = $1,200,000 ÷ 5.07 = $237,000.

If you have $237,000 saved at 38, you've coasted. Use the MyFIRE planner to run this calculation with Monte Carlo simulation — because real markets don't return a flat 7% every year, and knowing your success probability matters.