How to Use Tax Returns to Prove Income for Your Home Loan

Most Australian lenders use your lodged personal and company tax returns as the main proof of income for a home loan, especially if you’re self‑employed or a company director. Instead of looking at what you draw from the business week to week, they look at your taxable income over (usually) the last two years, apply their own adjustments and then stress‑test repayments with a 3% serviceability buffer (per APRA guidance). Understanding that process is the difference between a smooth approval and a nasty surprise.

This guide walks through exactly how lenders read your tax returns, the traps for company directors and small‑business owners, and what you can fix this week to present a stronger income story.

Lenders start by analysing your lodged personal and business tax returns.

1. Why tax returns matter so much in home loan approvals

For employees, payslips and group certificates usually tell the story. For business owners, investors and company directors, tax returns are the anchor document. They are signed, lodged with the ATO and subject to penalties if they’re wrong — so banks trust them.

Most lenders require at least two years of lodged personal tax returns and (where relevant) business financials and company returns before they will fully rely on self‑employed income. Some niche lenders will work off one year, but usually on tighter terms and lower maximum borrowing capacity.

What lenders are trying to answer

Every credit assessor is trying to answer a simple question:

"Can this person afford their home loan even if rates rise or their income dips?"

To do that, they:

1. Start with taxable income from your personal return.
2. Add or subtract items from your personal and company returns (add‑backs and adjustments).
3. Deduct living expenses (often benchmarked to HEM) and other debts.
4. Test repayments at an interest rate at least 3% above the actual rate (APRA buffer).

Roy Morgan’s research shows over 28% of Australian mortgage holders are currently ‘At Risk’ of mortgage stress, so lenders are under real pressure to be conservative.

If your tax returns under‑state your real earnings, your borrowing power will be clipped, even if business is booming today.

2. How lenders read your personal tax return

Your personal tax return ties everything together — salary, business income, dividends, distributions and rental properties. For most self‑employed borrowers, it is the starting point for serviceability.

2.1 Key sections lenders focus on

When an assessor opens your tax return, they are scanning for:

• Salary and wages (PAYG) – for those who are partly employed.
• Business or professional income (sole trader) – net profit after expenses.
• Distributions from trusts or partnerships – especially if you control the entity.
• Dividends from private companies – including franking credits.
• Rental income – rent received, interest, other costs and depreciation.
• Other income – interest, foreign income, capital gains.

They then cross‑check these with your Notice of Assessment (NOA) to ensure the return was lodged and accepted by the ATO.

2.2 Common add‑backs from your personal return

Tax law encourages you and your accountant to minimise taxable income. Lenders do the opposite: they try to estimate your true ongoing income.

They will often add back items such as:

• Work‑related or business depreciation – non‑cash, so usually added back.
• Extra personal super contributions – salary‑sacrifice above compulsory levels may be added back.
• One‑off expenses – major once‑off costs can sometimes be excluded from the income calculation if you document them.
• Certain interest costs – e.g. interest on investment loans can be added back to income and then treated separately as an expense.

Each lender has different rules (and risk appetite), which is why the same return can produce very different borrowing capacities across banks.

2.3 Rental properties and negative gearing

For investors, lenders usually:

• Start with gross rental income from your return.
• Deduct non‑cash costs like building depreciation (add‑back to income).
• Leave in real cash costs like interest, rates, insurance and repairs.

This means the negative gearing benefit that helps at tax time doesn’t always help at loan time. The bank is focused on whether you can cover all your loans if rents fall or rates rise.

2.4 Red flags on personal tax returns

Lenders are cautious about:

• Large, unexplained income drops between years.
• Unlodged or late returns – signs of poor financial control.
• High ‘other deductions’ without clear support.
• Tax debts on payment plans – especially if there are missed payments.

If any of these apply, it’s rarely a deal‑breaker, but you’ll need to explain and document them carefully.

For more detail on how your broader business picture is assessed, see How Banks Read Your Business Financials Before a Home Loan.