TL;DR Summary
Banks calculate self-employed borrowing power using your taxable income from tax returns — not your revenue or bank deposits. They average 2 years, apply allowable add-backs, then test whether you can service the loan at the assessment rate (currently around 9–9.5%). Lender policies vary significantly and choosing the right one can meaningfully increase your borrowing capacity.
The Formula Banks Use for Self-Employed Borrowing Power
Understanding how banks calculate your borrowing power is the first step to maximising it. For self-employed borrowers, the process looks like this:
- Step 1 — Determine assessed income: Start with net taxable income from your personal tax return (for sole traders) or salary/dividends from a company/trust structure. Average across 2 years if required.
- Step 2 — Apply add-backs: Add back allowable non-cash or non-recurring expenses (depreciation, one-off capital costs, certain interest). Each lender has different add-back policies.
- Step 3 — Calculate net income: Deduct living expenses (HEM or declared), existing loan repayments (credit cards, car loans, HECS), and any other committed liabilities.
- Step 4 — Test serviceability: Apply the assessment rate (actual rate + 3% buffer, minimum floor). Can your net income cover repayments at the test rate?
- Step 5 — Calculate maximum loan: Work backwards from maximum allowable repayments to determine the loan amount you can service.
Worked Example
A Sydney business owner: tax return shows $110,000 net profit. Depreciation add-back: $15,000. Assessed income: $125,000. No other debts. HEM living expenses (couple, no dependants): ~$48,000. Serviceability rate: 9.5%. Remaining income for loan service: ~$77,000/year ($6,417/month). At 9.5% assessment rate, this supports approximately $640,000–$680,000 in borrowing.
Note: actual borrowing power varies significantly between lenders based on their HEM tables, add-back policies, and assessment rates. A broker runs these numbers across multiple lenders to find your maximum.
Why Self-Employed Borrowing Power Is Often Lower Than Expected
The most common shock for self-employed borrowers is discovering their borrowing capacity is much lower than their income or bank account deposits would suggest. There are several reasons for this:
Declared Income vs Actual Cashflow
If you're smart about tax — and most business owners are — you've been claiming every legitimate deduction available. This reduces your taxable income and tax payable. But it also reduces the income figure lenders use. A business owner turning over $400,000 with $100,000 in taxable income will be assessed as if they earn $100,000, not $400,000.
This isn't avoidable, but it is manageable. Understanding self-employed add-backs — which expenses can legitimately be added back to your assessed income — is one of the most valuable things you can do before applying.
Two-Year Income Averaging
Most lenders take a 2-year average of your taxable income. If you had a strong Year 2 but a weaker Year 1, the average dilutes your recent performance. Some lenders will use the most recent year if income is trending up and the growth is explainable. Knowing which lenders do this — and how to present your income trajectory — is where a specialist broker adds significant value.
The Serviceability Buffer
By APRA regulation, lenders must test your ability to repay at your actual rate plus a minimum 3% buffer. With current variable rates around 6–6.5%, assessment rates sit at 9–9.5%. This buffer significantly compresses borrowing power compared to the actual rate you'd pay.
Strategies to Legally Increase Your Borrowing Power
There are several levers you can pull, both before and at the time of application:
Maximise Allowable Add-Backs
Work with your accountant to identify every allowable add-back expense in your tax return. Depreciation is the most common and universally accepted. Some lenders also accept interest on business loans being repaid at settlement, one-off consulting or legal fees, and pre-paid expenses. An accountant letter for your home loan should explicitly itemise each add-back.
Reduce Existing Liabilities Before Applying
Every existing debt commitment reduces your serviceability. Credit cards are particularly damaging — lenders typically assess a monthly repayment of 3% of the credit limit, regardless of whether you carry a balance. Reducing or closing credit card limits before applying can meaningfully increase your borrowing power.
- Pay down or close unused credit cards
- Repay car loans or personal loans if close to completion
- Reduce HECS repayment obligations if possible (difficult, but it's factored in)
- Avoid taking on any new debt 3–6 months before applying
Choose the Right Lender for Your Income Structure
This is often the most impactful lever of all. Different lenders calculate self-employed income very differently:
| Lender Type | Income Assessment Approach | Best For |
|---|---|---|
| Big 4 banks | 2-year average, conservative add-backs, standard HEM | Established self-employed with consistent, growing income |
| Second-tier banks | May use most recent year, broader add-backs | Trending-up income, strong recent year |
| Non-bank lenders | More flexible HEM, creative income assessment, higher LVR sometimes | Complex income structures, variable income |
| Specialist lenders | Alt doc, bank statement income, BAS-based assessment | Low doc, newer businesses, non-standard income |
Consider a Joint Application
If your partner or spouse earns PAYG income, a joint application combines both incomes and typically significantly increases your borrowing power. Even a modest PAYG income alongside your self-employed income can open up a substantially larger loan.
How Your Business Structure Affects Borrowing Power
Different business structures are assessed in different ways by lenders:
- Sole trader: Income flows directly to your personal tax return. Lenders use your Schedule of Business Income net profit.
- Partnership: Your share of partnership profit appears on your personal return. Most lenders require both years of partnership returns plus individual returns.
- Company director: Lenders use your salary (PAYG from the company) and may or may not include dividends or retained profits, depending on policy.
- Trust distributions: Assessed only if distributions are consistent and documentable. Irregular trust distributions may not be counted. See our guide on trust income home loans for the full picture.
The structure you operate under can have a major impact on which lender will give you the highest borrowing capacity. To understand more about how much you can borrow as self-employed, a full income assessment with a broker is the clearest path forward.
Frequently Asked Questions
Why is my self-employed borrowing power lower than expected?
Lenders use your taxable income from tax returns — not your revenue or bank deposits. If you've minimised tax through deductions, your declared income is lower. Add-backs can partially offset this, but the gap between cashflow and assessed income is the primary reason self-employed borrowing power surprises borrowers.
How much can a self-employed person borrow?
Typically 5–7x your assessed income, depending on lender, liabilities, and deposit. A 2-year average taxable income of $120,000 might support borrowing of $600,000–$840,000. A broker can calculate exact figures across multiple lenders based on your specific situation.
Do different lenders calculate borrowing power differently?
Yes — significantly. Lenders vary in which expenses they treat as add-backs, whether they use 1 or 2 years of returns, how they treat trust or company income, and their HEM benchmarks. The same borrower can have materially different borrowing power across different lenders.
Can I increase borrowing power without earning more?
Yes. Key strategies: maximise legitimate add-backs with your accountant, reduce or close credit card limits, repay small existing debts, choose the right lender for your income structure, and consider a joint application if a partner has PAYG income.
Does my business structure affect borrowing power?
Yes. Sole traders, company directors, partnership members, and trust beneficiaries are all assessed differently. Some structures allow broader income inclusion; others are more restrictive. A broker experienced with complex business structures is essential for getting the right outcome.
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