Coast FIRE: You Might Already Be Financially Independent and Not Know It

Updated July 2026 — key figures refreshed to current 2026-27 tax year and program values.

Disclosure: This content is for general educational and informational purposes only. It is not financial advice, investment advice, or tax advice, and does not take into account your personal financial situation, objectives, or needs. Before acting on any information, consider seeking independent advice from a qualified financial adviser licensed in your jurisdiction. Full disclaimer →

Here’s a scenario that will mess with your head a little.

You’ve been investing hard for several years. You’ve got a decent portfolio — maybe $200,000, maybe $350,000. You’re grinding toward your Freedom Number, still a long way off. Still thinking about decades of further contribution ahead of you.

Now imagine I told you that if you stopped investing right now — never added another dollar — your existing portfolio would grow to your full Freedom Number by traditional retirement age.

All on its own.

No more contributions needed. Just time and compounding.

Would you believe me?

This is called Coast FIRE, and it’s one of the most psychologically liberating concepts in personal finance. A lot of people have hit their Coast FIRE number and have no idea.

The Simple Concept Behind It

You’ve probably heard that compound interest is powerful. What’s less often discussed is just how powerful it is over long horizons.

$200,000 invested today, earning 7% annually and never touched, grows to:
– $786,000 in 20 years
– $1,540,000 in 30 years
– $3,020,000 in 40 years

That’s without adding a single dollar. Just the original $200,000 doing its thing.

Coast FIRE is the realisation that there’s a specific portfolio balance — at a specific age — where the compound growth between now and traditional retirement age will do all the remaining heavy lifting. Once you hit that balance, you’ve already “solved” retirement. You just need to let time pass.

You can stop the aggressive saving. Take a lower-paying job you actually like. Work part-time. Travel. Whatever you want — as long as you’re covering your current expenses and not eating into the portfolio.

How to Calculate Your Coast FIRE Number

You need three things:

1. Your full Freedom Number (Annual Expenses × 25)
2. Your current age
3. Your target retirement age (when you want to access your full portfolio)

The formula:

Coast FIRE Number = Full Freedom Number ÷ (1.07)^(years until retirement)

Let’s run it for a 35-year-old targeting retirement at 60, with $60,000 in annual expenses:

• Full Freedom Number: $60,000 × 25 = $1,500,000
• Years until retirement: 25
• (1.07)^25 = 5.43
• Coast FIRE Number: $1,500,000 ÷ 5.43 = $276,200

If you’re 35 with $276,200 invested, you’ve already solved retirement. Compound interest gets you to $1.5 million by 60 without you contributing another cent.

Now ask yourself: am I close to that number?

A lot of people who’ve been investing consistently for 5–10 years are closer than they think.

The Part That Changes Everything

Once you hit your Coast FIRE number, the whole game shifts.

Instead of “I need to keep grinding at this job to maximise my savings rate,” the question becomes: “I just need to earn enough to cover my current expenses. What would I actually do if the income pressure was off?”

That’s a radically different question. And most people have never had the opportunity to ask it.

Some people discover they’d keep doing exactly what they’re doing — but with a completely different psychological relationship to it. The chronic stress of “I need this job” evaporates. They become better workers, paradoxically, because they’re choosing to be there rather than compelled.

Others pivot to work they’ve been putting off because it paid less. Teaching. Nursing. Creative work. Building something they actually care about. A career that would have been financially impractical before is suddenly viable, because you’re not relying on it to build wealth — just to fund this month.

Others drop to part-time. Work three days a week, spend the other four doing whatever constitutes a good life for them.

None of these options require fully retiring. They just require knowing your Coast FIRE number — and having the confidence to act on it.

A Word on the “Safe” Assumptions

The calculation above uses 7% annual return, which is the commonly cited long-run real return for a globally diversified equity portfolio. Some people use 6% to be more conservative. Some use 8% if they’re optimistic. The specific number changes your Coast FIRE figure but doesn’t change the underlying concept.

The important thing is to use the same assumption consistently across your calculations. Don’t use 8% for Coast FIRE and 5% for your full Freedom Number — you’ll end up with a distorted picture.

Also worth noting: reaching your Coast FIRE number doesn’t mean you stop caring about your portfolio. It means you stop needing to add to it. If you can afford to keep contributing, do so — it just means you’ll hit your full Freedom Number earlier, or retire on a fatter income, or both.

Coast FIRE vs. The Other Variants

There are several stages on the FIRE spectrum, and it’s worth knowing where Coast FIRE fits:

Coast FIRE: Your portfolio is large enough to compound to your Freedom Number by traditional retirement age without further contributions. You just need to cover current expenses through work.

Barista FIRE: A smaller portfolio that, combined with enjoyable part-time work, covers all your expenses right now. No aggressive investing required. You’re living a good life on purpose.

Lean FIRE: Full financial independence on a modest lifestyle budget. Work is optional. Spending is intentional.

Fat FIRE: Full financial independence with a generous budget. Work is optional. Life is comfortable.

Coast FIRE is the first major milestone worth celebrating on this journey. It’s the point at which compound interest officially starts working harder than you are.

A Note on Tax-Advantaged Accounts

Coast FIRE calculations get more interesting when you’re holding assets across different account types.

Locked accounts (Super/Pension/401k): These can’t be accessed until a certain age (60 in AU, 59.5 in US, 55 in UK (rising to 57 in 2028), 65 in NZ). The practical approach: calculate two separate Coast FIRE numbers. First, a “pre-retirement Coast FIRE” for your accessible accounts (taxable brokerage). Second, note separately that your locked account will likely cover your full retirement needs independently by the time you can access it. This removes the pressure from your early-retirement portfolio.

Flexible, tax-free accounts (ISA in UK, TFSA in Canada): These are accessible anytime with no tax consequence. Coast FIRE planning is straightforward — just use your standard formula. These accounts simplify the math considerably.

Standard taxable brokerage: Accessible anytime, but gains are taxable. Use the standard Coast FIRE calculation, and consider the tax drag on withdrawals.

For early retirees in Australia, UK, US, and Canada, the recommendation is often: calculate a “pre-retirement Coast FIRE” for your taxable/accessible accounts (the portfolio you’ll draw from until traditional retirement age), then separately note that your tax-advantaged retirement account (Super, 401k, SIPP, KiwiSaver) will likely cover independent retirement once you can access it. This separates the early-retirement question from the traditional-retirement question — and often reveals that you need less in your accessible portfolio than you initially thought.

Are You Already There?

Seriously — go check.

Take your annual expenses. Multiply by 25. That’s your full Freedom Number.

Now divide by (1.07)^(years until age 60 or your target retirement age).

Is your current portfolio larger than that result?

If it is, congratulations. You’ve already solved retirement. Everything from here is gravy.

If you’re close — maybe 80% of the way there — you’re looking at a timeline of months, not years, until you hit that milestone.

This is why knowing your numbers matters. Not to stress about them. But because you might already have more freedom than you realise.

Know your number. Own your life.

Use the FIRE Calculator to calculate your Coast FIRE number alongside your full Freedom Number — and see exactly how the timelines compare.