FIRE number Australia: how much do you need to retire early?
Your FIRE number is 25× your annual expenses. Here's how the 4% rule works, what makes Australian FIRE different, and the five paths to financial independence.
Tip
The 4% rule and 25× multiplier
The 4% safe withdrawal rate comes from the 1994 Trinity Study — US research showing that a retiree who withdraws 4% of their portfolio in year one (then adjusts for inflation) has historically had a very high probability of their money lasting 30+ years.
At 4%, you need 25 times your annual spending:
The maths
$50,000/year expenses → $1,250,000 FIRE number
$70,000/year expenses → $1,750,000 FIRE number
$100,000/year expenses → $2,500,000 FIRE number
Formula: annual expenses ÷ 0.04 (or × 25)
Some conservative planners use 3.5% (28.6× multiplier) for retirements of 40+ years. Some aggressive planners use 5% (20× multiplier) if they have income from property, part-time work, or the Age Pension. The 4% default is the most widely used.
Savings rate: the biggest lever
Your savings rate — how much of your income you save and invest — is the single biggest determinant of how long it takes to reach FIRE. Assumptions: $100k income, $50k expenses at 0% savings, 7% return.
Green = under 15 years. Olive = 15–30 years. Amber = over 30 years. Assumes $100k income and 7% annual return.
The 5 FIRE paths
| Type | Annual expenses | FIRE number | Summary |
|---|---|---|---|
| Lean FIRE | < $40,000/yr | < $1M | Extreme frugality. Possible in Australia with a paid-off home and simple lifestyle. Hard to sustain if circumstances change. |
| Regular FIRE | $50,000–$80,000/yr | $1.25M–$2M | Comfortable but modest. Achievable for many Australian dual-income households within 15–20 years of focused saving. |
| Fat FIRE | $100,000+/yr | $2.5M+ | Full lifestyle freedom. Requires a high income or long runway. Less compromise in retirement. |
| Coast FIRE | Any | Varies by age | Enough saved to stop contributing — growth alone reaches your number. You work just enough to cover current expenses. |
| Barista FIRE | Any | Below full FIRE | Semi-retire with part-time or casual work covering some expenses. Lets your portfolio grow while reducing the stress of full-time work. |
Australian FIRE: super changes everything
Super is the biggest Australian-specific factor in FIRE planning. Super is preserved — locked away until you meet a condition of release (typically reaching preservation age at 60 and retiring). This means:
Two portfolios, not one
If you want to FIRE before 60, you need a non-super portfolio large enough to cover expenses from your FIRE date to age 60. After 60, your super balance kicks in and can supplement (or fully replace) your non-super withdrawals. A 45-year-old aiming to FIRE at 50 needs 10 years of non-super runway.
Super turbocharges post-60 FIRE
Super contributions are taxed at 15% (not your marginal rate), and earnings inside super are taxed at 15% (10% for assets held 12+ months). A $30,000/year salary sacrifice contribution saves $8,250 in tax at the 37% marginal rate. After 60, withdrawals from a super pension are completely tax-free. Super is the most tax-efficient accumulation vehicle in Australia.
Age Pension backstop
The Age Pension (~$29k/year single, $44k/year couple) is available from age 67 subject to income and assets tests. For FIRE planners, the Age Pension is not something to rely on — but it's a meaningful safety net that many Australians eventually qualify for as their portfolio depletes below the assets test threshold.
Note
The most powerful lever: your expenses
Reducing your annual expenses is more powerful than increasing your income, because it works on both sides of the equation:
- Spending $10,000 less per year reduces your FIRE number by $250,000 (× 25).
- It also frees up $10,000/year to invest — accelerating the timeline from both directions.
- A $10,000 income increase only adds $4,650–$6,300 after tax (at most bracket rates).
The savings rate is the core metric of FIRE. Someone saving 50% of their take-home pay reaches FIRE in roughly 17 years from zero — regardless of income level. Someone saving 70% reaches it in 8–9 years.
Frequently asked questions
How do I calculate my FIRE number?
Multiply your expected annual expenses in retirement by 25. That's your FIRE number. If you plan to spend $60,000/year, your FIRE number is $1,500,000. This is the inverse of the 4% safe withdrawal rate: $1,500,000 × 4% = $60,000/year in withdrawals. The maths assumes your portfolio earns enough to sustain that withdrawal indefinitely.
Does the 4% rule work in Australia?
Yes, broadly. Australian research has validated the 4% rule using ASX data. The combination of Australian and international shares has historically delivered enough long-run returns to support a 4% withdrawal. Some conservative planners use 3.5% for very long retirements (40+ years) or if they want extra safety margin. The Age Pension also provides a backstop that makes Australian FIRE safer than US FIRE in many scenarios.
Can I count my super in my FIRE number?
Sort of. Super is preserved until age 60 (preservation age), so it's only accessible once you retire after 60. If you plan to retire before 60, you need enough outside-super assets to cover the years from FIRE until 60. After 60, your super is available tax-free and can be counted toward your number. This is sometimes called a 'two-portfolio' FIRE strategy: one for before 60, one for after.
What is Coast FIRE?
Coast FIRE means you've saved enough that compound growth alone will reach your FIRE number by traditional retirement age (say, 60–67), without any additional contributions. You can 'coast' — work just enough to cover living expenses without needing to save further. For example, $350,000 at age 35 at 7% real return will grow to roughly $1.35M by age 65 — enough for $54k/year using the 4% rule.
How does the Age Pension affect FIRE planning?
The Age Pension (currently ~$29,000/year for a single) is available from age 67 subject to income and assets tests. For most Australians pursuing FIRE, the Age Pension is a backstop rather than a primary income source — your FIRE portfolio is designed to be self-sustaining. However, the assets test taper means that spending down your portfolio below certain thresholds activates increasing Age Pension payments, which can significantly extend portfolio longevity.
What expenses should I use?
Use your expected annual spending in retirement — not your current income. Most FIRE practitioners budget their actual lifestyle costs: housing (if renting), food, transport, travel, healthcare, and fun. Don't include current work-related expenses (commuting, work lunches, professional development) but do include retirement-specific costs (more travel, healthcare as you age). Being too conservative on expenses is the most common FIRE planning mistake — underestimating healthcare costs and inflation can erode a portfolio faster than expected.