One of the first questions every Australian investor asks is: how much should I be investing each month? The answer depends on your income, expenses, existing debts, goals, and timeline — but there are practical frameworks to get you started.
Start With Your Cash Flow
Before choosing an investment amount, map your monthly cash flow:
Step 1 — Calculate monthly take-home income: After-tax salary, rental income, side income, Centrelink (if applicable).
Step 2 — Calculate essential expenses: Rent/mortgage, utilities, groceries, transport, insurance, minimum debt repayments.
Step 3 — Calculate discretionary expenses: Dining, entertainment, subscriptions, hobbies, clothing.
Step 4 — Identify investable surplus: Take-home − essential − discretionary = what you can invest.
$$\text{Monthly investable amount} = \text{Take-home income} - \text{Essential expenses} - \text{Discretionary spending}$$
Common Budgeting Frameworks
50/30/20 Rule (modified for investing)
| Category | % of after-tax income | Examples |
|---|---|---|
| Needs | 50% | Rent, groceries, utilities, transport, insurance |
| Wants | 30% | Dining, entertainment, travel, hobbies |
| Savings & investing | 20% | Emergency fund, ETFs, extra super contributions |
For a $80,000/year salary (~$5,800/month after tax):
- Needs: $2,900
- Wants: $1,740
- Investing: $1,160/month
Pay Yourself First
Automate investment contributions on payday — before discretionary spending — so the investment happens regardless of how much you spend during the month. Set up a regular brokerage transfer or scheduled ETF purchase on payday.
The Savings Rate Approach (FIRE-aligned)
Savings rate = (Amount saved + invested) ÷ Take-home income × 100
- 10% savings rate: $580/month on $80K salary
- 20% savings rate: $1,160/month
- 30% savings rate: $1,740/month
- 50% savings rate: $2,900/month (FIRE territory)
What $100/Month Can Become
A common misconception is that small amounts aren’t worth investing. Compounding changes this:
| Monthly investment | 7% return | After 20 years | After 30 years |
|---|---|---|---|
| $100 | 7% | $52,397 | $121,997 |
| $200 | 7% | $104,794 | $243,994 |
| $500 | 7% | $261,985 | $609,985 |
| $1,000 | 7% | $523,970 | $1,219,970 |
Every dollar invested earlier has significantly more compounding time than a dollar invested later.
Australian Income Benchmarks — How Much Is Realistic?
| Salary (before tax) | Approx. take-home/month* | 20% savings/invest | 30% savings/invest |
|---|---|---|---|
| $60,000 | ~$4,300 | $860 | $1,290 |
| $80,000 | ~$5,750 | $1,150 | $1,725 |
| $100,000 | ~$7,050 | $1,410 | $2,115 |
| $120,000 | ~$8,250 | $1,650 | $2,475 |
| $150,000 | ~$9,950 | $1,990 | $2,985 |
*Approximate after income tax and 2% Medicare levy. Does not account for HECS-HELP repayments, which significantly reduce take-home for many Australians.
Priority Order for Investing
Before choosing how much to invest in a brokerage account, consider this priority order:
1. Emergency fund first — 3–6 months of expenses in a HISA. Non-negotiable.
2. High-interest debt — Any debt above ~7–8% interest rate (credit cards, personal loans) should be paid before investing. A guaranteed 20% return from paying off a credit card beats an uncertain 8% from shares.
3. Super salary sacrifice — Concessional super contributions are taxed at 15% rather than your marginal rate. If your marginal rate is 32.5%+, salary sacrificing into super gives an immediate ~18% tax saving on that money. Highly effective before further investing.
4. HISA or term deposit for short-term goals — Money needed within 3 years should not be in shares.
5. Long-term investing — After the above are addressed, invest the remainder in a diversified ETF portfolio.
Minimum Investment Amounts in Australia
| Platform | Minimum per trade | Regular invest minimum | Brokerage fee |
|---|---|---|---|
| CommSec | $500 | N/A | $10–$19.95 |
| SelfWealth | No minimum | N/A | $9.50/trade |
| Pearler | $1 | $1 (auto-invest) | $6.50/trade (or $0 for select ETFs) |
| Stake | No minimum | N/A | $3/trade (USD exchange fee applies for US stocks) |
| Superhero | $100 | $100 (monthly) | $2/ASX trade (ETFs), $5 for others |
For small investors, Pearler and Superhero’s low minimum thresholds and low brokerage make regular small investments viable.
Related Calculators
- DCA Calculator Australia
- Investment Calculator Australia
- Brokerage Fee Calculator Australia
- Investment Calculators hub
Frequently Asked Questions
How much should a beginner invest in Australia? Any amount consistently invested is better than waiting for a “large enough” sum. Even $100–$200/month compounds meaningfully over 20–30 years. The most important thing is to start — automate regular contributions on payday and increase as income grows. General information only.
What percentage of my salary should I invest in Australia? A common starting target is 10–20% of take-home income. The FIRE community often targets 30–50% for faster financial independence. The right number depends on your goals, timeline, income level, and existing financial obligations (debt, rent, family). Even 5% invested consistently is a strong start.
Do I need to pay off my mortgage before investing in Australia? Not necessarily — it depends on the interest rate and expected return. If your mortgage rate is 6% and you expect shares to return 8–9%, there is a case for investing alongside mortgage repayments. However, mortgage repayment is a guaranteed, risk-free return — many Australians prefer the certainty. A common approach is to split extra funds between the offset account and an investment portfolio.
This article provides general financial information only. For advice tailored to your situation, speak with a licensed financial adviser through the ASIC financial advisers register or MoneySmart.