How to Calculate Your FIRE Number in Australia (2026)

Your FIRE number is the total wealth needed to fund your lifestyle indefinitely without employment income. Get it right and you'll know exactly when you can stop working. Get it wrong and you'll either work years longer than necessary — or run out of money.

For Australians, calculating your FIRE number is more complex than the simple formulas you'll find on US-focused blogs. Our superannuation system, preservation age rules, and tax structure mean you need a two-part calculation that most overseas tools completely ignore.

The Basic Formula: The 4% Rule

The most common starting point is the 4% rule, derived from the 1998 Trinity Study. The idea is simple:

If you withdraw 4% of your portfolio in year one, then adjust for inflation each year after, your money has historically lasted at least 30 years.

To find your FIRE number using this rule:

Annual Expenses × 25 = Your FIRE Number

For example, if you spend $60,000 per year, your FIRE number is $1,500,000.

If you spend $80,000 per year, it's $2,000,000.

Simple enough. But for Australians, this number alone is misleading.

Why the 4% Rule Is Different in Australia

The Trinity Study was based on US market data and US tax rules. Australia has several structural advantages that make the 4% rule potentially conservative for us:

1. Tax-free super withdrawals after 60. In the US, retirement account withdrawals are taxed as income. In Australia, superannuation earnings and withdrawals are completely tax-free once you reach 60. This means your effective withdrawal rate is higher than 4% in real terms.

2. The Age Pension as a safety net. If your assets fall below certain thresholds, the Age Pension provides a backup income stream. This doesn't exist in the same form in the US.

3. Lower healthcare costs. Medicare covers most healthcare in Australia. Americans need to budget $10,000–$20,000+ per year for health insurance in early retirement — we don't.

4. Franking credits. Australian shares pay franked dividends, which means the company has already paid tax on the profits. You receive a tax credit for this, effectively boosting your after-tax returns.

However, Australia has one major disadvantage for early retirees: you can't access your super until preservation age.

The Australian FIRE Number: Two Buckets

This is where most overseas calculators fail. In Australia, early retirement requires two pools of wealth:

Bucket 1: The Bridge Fund

Your bridge fund is the money you'll live on from the day you retire until you can access super at age 60 (for anyone born after 1 July 1964).

If you plan to retire at 45, you need 15 years of living expenses outside super. This typically comes from:

• Index ETFs (e.g. VAS, VGS, VDHG)
• Individual shares
• Rental property income
• Bonds or cash (for the first 2–3 years as a buffer)

Bridge Fund calculation:

Annual Expenses × Years Until Preservation Age = Minimum Bridge Fund

Example: $60,000 × 15 years = $900,000 (minimum, not accounting for investment returns during drawdown)

In practice, the number is lower because your bridge fund continues to earn returns while you draw it down. A more accurate calculation uses a drawdown model, which our FIRE calculator does automatically.

Bucket 2: Superannuation

Your super needs to last from age 60 until death — typically 30+ years. The good news: super earnings and withdrawals are tax-free after 60, and the concessional tax rate of 15% on contributions and earnings while accumulating makes it incredibly efficient.

Super target calculation:

Annual Expenses × 25 = Super Target (using the 4% rule from age 60)

Example: $60,000 × 25 = $1,500,000 in super at age 60

But you don't need $1.5M in super today. You need enough that it grows to $1.5M by the time you turn 60, with contributions continuing until you retire.

Salary Sacrifice: Your Biggest Lever

The gap between your marginal tax rate and the 15% super contributions tax is free money. For most FIRE-focused Australians, maximising salary sacrifice is the single most impactful strategy.

FY2025-26 rates including the 2% Medicare levy. Super contributions are taxed at 15%.

The concessional contributions cap for 2025-26 is $30,000 per year (including employer contributions). If your employer contributes $14,400 via the 12% super guarantee (on a $120,000 salary), you can salary sacrifice up to $15,600 more.

Over 20 years with compound growth at 7% nominal returns, that extra $15,600 per year becomes approximately $770,000 — with a significant portion coming from tax savings you wouldn't have had otherwise.

A Worked Example

Let's say you're 32 years old, earning $120,000, spending $55,000 per year, with $80,000 in super.

Target retirement age: 45 (13 years of bridge fund needed)

Bridge Fund needed: ~$550,000 (accounting for investment returns during 13-year drawdown, modelled at 5% real returns)

Super target at 60: $1,375,000 (using $55,000 × 25)

Current super trajectory: $80,000 today + employer SG + salary sacrifice, growing at 7% nominal for 28 years (until age 60) = approximately $1,600,000. You're already on track for the super bucket.

The real question: Can you accumulate $550,000 in your bridge fund in 13 years? At a savings rate of $30,000/year into ETFs with 7% returns, you'd reach approximately $640,000. Yes — you're on track to retire at 45.

This is exactly the kind of modelling our FIRE calculator does for you, with your actual numbers.

Common Mistakes

Mistake 1: Using a US FIRE calculator. These don't account for super preservation age, the bridge fund requirement, Australian tax brackets, or franking credits. Your number will be wrong.

Mistake 2: Ignoring super. Some Australians only think about their non-super investments. But super is your most tax-efficient wealth vehicle. Salary sacrifice into super and let it compound — it's doing heavy lifting for your post-60 retirement.

Mistake 3: Not planning for the bridge. Knowing your total FIRE number isn't enough. You need to know how you'll fund each year between early retirement and age 60. A $2M net worth doesn't help if $1.8M is locked in super and you want to retire at 42.

Mistake 4: Using today's expenses without inflation. $55,000 today will be roughly $75,000 in 15 years at 2.5% inflation. Our calculator handles this automatically — make sure whatever tool you use does too.

Next Steps

1. Calculate your annual expenses — be honest. Include everything: rent/mortgage, food, insurance, holidays, subscriptions, the lot.
2. Check your super balance — log into your super fund or myGov.
3. Run the numbers — use our FIRE calculator to model your bridge fund, super growth, and salary sacrifice in one place.
4. Optimise — the calculator will show you exactly how salary sacrifice, reduced expenses, or increased income shifts your freedom date.

Your FIRE number isn't a fixed target. It moves with your expenses, returns, and strategy. The key is having a clear model so you can make informed decisions — not guesses.