Borrowing Power for Small Business Owners: A Practical Home Loan Guide

If you run a small business in Australia, how much you can borrow on a home loan depends on your usable taxable income, how stable that income looks, your debts and your real living costs. Most self‑employed borrowers end up with borrowing power somewhere around 4–6 times their annual taxable income, but the exact figure changes lender by lender.

In this guide, you’ll see how lenders actually calculate borrowing capacity for small business owners, walk through worked examples, and get a list of actions you can take this week to safely increase what you can borrow.

How lenders really decide “how much you can borrow”

For any home loan, the core test is serviceability: can you afford the repayments now and if interest rates rise? APRA requires banks to test your loan at least 3% above the actual rate, so even if you’re offered, say, 6.0% (illustrative only), your application may be tested at 9.0% or more.

Lenders typically look at:

1. Your income – salary, business profit, add‑backs (e.g. depreciation), rental income.
2. Your debts – credit cards, personal loans, car leases, business debts you’ve guaranteed.
3. Your living costs – declared expenses, cross‑checked against HEM (Household Expenditure Measure).
4. Loan details – requested amount, interest rate, term (usually 30 years), P&I vs IO.

They plug all of this into a calculator to see how much is left over each month after tested repayments. That leftover amount (your surplus) determines your maximum borrowing limit.

For PAYG employees this is fairly simple. For small business owners, it’s more complicated.

The self‑employed twist: why it feels tougher

As a small business owner, lenders see you as higher risk than a stable PAYG employee, even if you earn more. Key differences:

• They usually want 2 full years of lodged tax returns for you and your business (most mainstream lenders – see /insights/small-business-home-loan-basics-eligibility).
• They often average the last two years’ income, or use the lower year, which can hurt if you had a weaker year.
• Variable income (bonuses, distributions) may be “shaded” – for example, only 80% counted.
• They look closely at business debts and cash buffers, not just your personal balance sheet.

That’s why your borrowing capacity can end up much lower than an online calculator suggests, unless the calculator is designed for self‑employed borrowers.

Start by translating your business results into usable personal income.

Step 1 – Estimate your usable income as a business owner

The starting point is how lenders translate your business results into personal income.

Full‑doc self‑employed borrowers

If your financials and tax returns are up to date, you’ll typically be assessed as full‑doc. Lenders usually work off:

• Your taxable income from your personal return; plus
• Your share of business profit from company/partnership/trust returns; plus
• Add‑backs like non‑cash expenses (e.g. depreciation), once‑off costs, some super contributions.

They’ll then:

• Average the last 2 years, or
• Use the most recent year if it’s clearly stronger and consistent with BAS/management accounts.

If your taxable income is low because your accountant has maximised deductions, your usable income – and therefore borrowing power – may be much lower than your lifestyle suggests.

Alt‑doc / low‑doc borrowers

If you don’t have two clean years of tax returns, some lenders offer alt‑doc options, where income is evidenced with:

• Accountants’ letters
• BAS statements
• Business bank statements

The trade‑offs usually include:

• Potentially lower borrowing power (more conservative treatment of income)
• Often a higher interest rate than sharp full‑doc deals
• Sometimes lower maximum LVRs (e.g. 80% instead of 90–95%)

Used well, alt‑doc can still make sense – especially for strong businesses that simply don’t have recent returns ready – but it needs to fit your bigger plan (see /insights/mortgage-brokers-self-employed-professionals-small-business-owners).

Worked income example: translating profit into borrowing power

Say you:

• Operate a Pty Ltd company
• Own 100% of the shares
• Have the following results:

Year 1

• Company net profit before tax: $150,000
• Your salary: $60,000

Year 2 (most recent)

• Company net profit before tax: $200,000
• Your salary: $80,000
• Depreciation expense: $20,000

A lender might do something like:

1. Take Year 1 total income: $60,000 salary + $150,000 profit = $210,000.
2. Take Year 2 total income: $80,000 salary + $200,000 profit + $20,000 depreciation add‑back = $300,000.
3. Average two years: ($210,000 + $300,000) ÷ 2 = $255,000.
4. Shade variable components slightly (for risk) – say they accept $240,000 as usable income.

As a very rough guide, that might support borrowing of somewhere between $960,000 and $1.2m (4–5 times usable income), depending on debts, dependants and living costs.