Australian FIRE Calculator — Compare ETF vs Property Paths

If you are searching for an Australian FIRE calculator, the real question is usually not "what is my number?" It is whether your current savings rate, spending target, and asset choice produce a retirement path that still works when assumptions change. This calculator helps you answer that by comparing an ETF path and an investment property path under Australian tax settings — side by side, on the same baseline.

What this FIRE calculator does

This app models two parallel retirement paths: one where you invest in a diversified ETF portfolio, and another where you purchase an investment property. Both paths use the same starting capital, annual contribution, spending target, and time horizon. The calculator then applies Australian resident income tax, Medicare levy, capital gains tax (with optional CGT discount), franking credits on ETF dividends, and property-specific costs including stamp duty, management fees, vacancy, and maintenance.

The result is not a prediction. It is a structured comparison that lets you see which path reaches your FIRE target sooner, which carries more downside risk, and what is actually driving the difference — tax drag, leverage, cashflow pressure, or compounding.

How Australian tax settings affect your FIRE timeline

Australian tax treatment creates real differences between ETF and property paths that generic overseas calculators miss entirely. Here are the key factors this calculator models:

Tax factor	ETF impact	Property impact
Income tax brackets	Dividends taxed at marginal rate	Net rental income taxed at marginal rate
Franking credits	Reduce effective tax on dividends (default 70% franked)	Not applicable
CGT discount	50% discount on gains held over 12 months	50% discount on gains held over 12 months
Negative gearing	Not applicable	Property losses can offset other income
Medicare levy	2% on taxable income	2% on taxable income
Transaction costs	Minimal brokerage	Stamp duty on purchase, agent fees on sale

These differences compound over a 15-30 year horizon. A path that looks slightly better in year one can fall behind or pull ahead significantly once tax drag, franking credits, and transaction costs accumulate.

What to set first in the calculator

Start with the inputs that define the shape of your plan before touching asset-specific assumptions:

• Current age and projection horizon — how many years you are modelling
• Annual spending target — this drives the FIRE target via the safe withdrawal rate (default 4%)
• Annual investment contribution — how much you can direct to investments each year after tax and living costs
• Starting portfolio balance — what you already have invested outside super

Once those inputs are stable, compare ETF return assumptions (total return, dividend yield, franking percentage) against property assumptions (purchase price, rental yield, vacancy, management fees, loan interest, and sale year).

Example: a 30-year-old on $90,000

Consider someone aged 30 earning $90,000 before tax, spending $50,000 per year, and saving $20,000 per year into investments. Their FIRE target at a 4% safe withdrawal rate would be $1,250,000 ($50,000 ÷ 0.04).

With a 7% ETF total return and 3% dividend yield (70% franked), the ETF path might reach FIRE around age 52-55 depending on tax drag. A property path with 4% growth, 4% rental yield, 2% vacancy, and 6% loan interest could reach the same target earlier or later depending heavily on leverage, expenses, and sale timing.

The point is not to find one "right" answer from a single run. It is to save that baseline, create a tougher second scenario (lower returns, higher vacancy), and see whether the winner still wins.

Common mistakes when using a FIRE calculator

• Comparing optimistic property against conservative ETFs — keep assumptions symmetric. If you use 7% ETF return, do not pair it with 6% property growth unless you have strong reasons.
• Ignoring tax drag — pre-tax returns look similar, but after Australian tax treatment the effective returns can diverge by 1-2% per year.
• Using a single scenario — one baseline tells you very little. Save it, then test a weaker case to see how fragile the plan is.
• Treating the result as a forecast — this is a scenario comparison tool, not a crystal ball. The value is in the relative difference between paths, not the absolute numbers.
• Forgetting about super — your non-super FIRE portfolio is only part of the picture. Factor in when you can access super (preservation age) and how it changes your drawdown needs.

When to use ETF vs property scenarios

Use the ETF path when you want to model a simple, liquid, low-maintenance investment approach. Use the property path when you want to test whether leverage, rental income, and capital growth can accelerate your FIRE timeline — while also seeing the full cost of vacancy, management, maintenance, and stamp duty.

Many Australians end up with a hybrid approach: ETFs for the core portfolio plus one investment property. This calculator helps you understand the tradeoffs before committing capital.

How to get more value from the result

Do not stop at the first winning result. Save the baseline, create a tougher second scenario, and use the comparison board, decision drivers, and robustness view together. The decision drivers panel shows whether the lead comes from tax efficiency, leverage, compounding, or cashflow — which tells you how durable that advantage is likely to be. The robustness panel tests whether the winner keeps winning across a range of assumptions.

That turns the tool from a headline result into a real planning workflow you can revisit every 6-12 months as your income, spending, and market conditions change.