Self-employed income isn't assessed the same way as a salary. Because business income fluctuates year to year, lenders use "income averaging" — taking your income across 2 years to arrive at a qualifying figure. The method matters enormously. The same two tax returns can produce wildly different assessed income figures depending on which lender you apply to.
The 3 Income Averaging Methods
Simple 2-Year Average
Add Year 1 + Year 2 income, divide by 2. Used by the majority of lenders including most major banks.
Example: Year 1: $100,000 | Year 2: $130,000
→ Assessed income: $115,000
Best when: your income is steady or showing only modest growth. Neutral outcome for most borrowers.
Most Recent Year (Trend-Based)
When income is growing, some lenders use Year 2 only (or weight it more heavily). Requires the increase to be significant (typically >15–20%) and accompanied by an accountant explanation.
Example: Year 1: $80,000 | Year 2: $130,000
→ Assessed income: $130,000 (vs. $105,000 on simple average)
+$25,000 more borrowing power
Best when: Year 2 is substantially higher than Year 1, and there's a clear reason for the earlier year being lower.
Lower Year Used (Conservative)
Some Big 4 banks in conservative credit conditions use the lower of the two years. This is the worst outcome for self-employed borrowers with volatile income.
Example: Year 1: $80,000 | Year 2: $130,000
→ Assessed income: $80,000 (vs. $105,000 on simple average)
−$25,000 less borrowing power
Best to avoid: apply to lenders that use simple average or most-recent-year for growing income scenarios.
How Averaging Interacts With Add-Backs
Income averaging happens after add-backs are applied. This means the sequence is:
- Take Year 1 taxable income
- Apply allowable add-backs to Year 1 → get adjusted Year 1 income
- Take Year 2 taxable income
- Apply allowable add-backs to Year 2 → get adjusted Year 2 income
- Average the two adjusted figures
Add-backs example before averaging
| Item | Year 1 | Year 2 |
|---|---|---|
| Taxable income | $75,000 | $110,000 |
| + Depreciation add-back | +$30,000 | +$20,000 |
| + Super add-back | +$15,000 | +$15,000 |
| Adjusted income | $120,000 | $145,000 |
| 2-year average | $132,500 | |
Without add-backs the average would have been $92,500 — $40,000 less assessed income. This translates to roughly $160,000 less borrowing capacity.
Which Lenders Use Which Method?
Lender policies change, and the specific method applied can depend on the assessor and the file. The general tendencies as of early 2026:
| Lender | Primary Method | Trend Exception? |
|---|---|---|
| CBA | 2-year average (or lower year in risk-off) | Limited — strong evidence required |
| ANZ | 2-year average | Occasionally, with accountant letter |
| Westpac | Lower of 2 years (conservative) | Rarely accepted |
| ING | 2-year average OR Year 2 if trend clear | Yes — one of the best for trend income |
| Macquarie | 2-year average + strong add-backs policy | Yes — detailed add-backs accepted |
| Pepper Money | Contextual — most recent year favoured | Yes — excellent for recovering income |
| Liberty Financial | Accountant-declared income + BAS support | Yes — flexible assessor review |
| La Trobe Financial | Multiple signals: tax + BAS + bank statements | Yes — assessor review of full picture |
Policies current as at April 2026. Lender policies are subject to change without notice — always verify with your broker.
When Income Is Rising Rapidly: The "Accelerator" Scenario
If your business has had strong growth — say income has doubled between Year 1 and Year 2 — a simple average actively undersells your current capacity. A broker's role in this scenario is to:
- Identify lenders that use Year 2 income when there's a significant upward trend
- Prepare the accountant letter explaining the Year 1 starting point and current position
- Support the Year 2 income with current BAS statements showing the new revenue level is sustained
- If the current year (Year 3) is even stronger, explore whether a lender will accept a current year income projection
Don't let a conservative lender undercut 2 years of hard work
The difference between a Westpac assessment (lower year: $80K) and an ING assessment (Year 2: $130K) on the same two tax returns is $50,000 of assessed income. On a 6× income borrowing multiple, that's $300,000 difference in maximum loan size. Lender selection is not a detail — it's the single highest-leverage decision in your application.
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Lender comparison and strategy below.
Advanced Averaging Strategies: What Brokers Do
Strategy 1: Add-Backs First, Average Second
Never let a lender average raw taxable income if add-backs are available. Depreciation schedules, super contributions, and one-off deductions should be documented and added back before the averaging calculation. The order matters: add-backs FIRST, then average. A broker submits the add-backs schedule with the application, not as an afterthought.
Strategy 2: Lender-Specific Averaging Policy Matching
Match the lender to the income pattern. Growing income → ING or Pepper (Year 2 weighting). Stable income → Macquarie or Bankwest (strong add-backs policy). Declining or volatile income → La Trobe or Liberty (multiple income signals). A broker with a 30+ lender panel can run multiple assessments in parallel and compare outcomes before submitting.
Strategy 3: The 3-Year Option
A minority of lenders will consider 3 years of income history if it produces a better result. If Year 3 (the oldest year) was your best year, it's worth asking your broker whether any target lenders allow a 3-year average. Not common, but used by some specialist lenders in certain scenarios.
Strategy 4: Spouse / Co-Borrower Income to Reduce Exposure
If your partner has PAYG employment income, including them as a co-borrower means their income is assessed on full doc terms (last 2 payslips + employer letter). This reduces the dependence on self-employed income averaging and may allow you to borrow against a larger combined income with a more conservative lender.
The Hidden Cost of the Wrong Lender
Using the wrong lender doesn't just mean a lower loan amount — it can mean a higher rate, worse features, or a decline that appears on your credit file. Here's the full cost picture of a suboptimal lender choice:
| Factor | Right Lender | Wrong Lender |
|---|---|---|
| Assessed income | $132,500 (with add-backs + Year 2) | $75,000 (lower year, no add-backs) |
| Max loan (6× income) | ~$795,000 | ~$450,000 |
| Rate (approx.) | 6.3% (non-bank full doc) | 7.5% (low doc, forced by low income) |
| Annual interest ($600K loan) | $37,800 | $45,000 |
| Annual cost difference | $7,200 per year + access to the right property | |