How Banks Assess Your Income for a Home Loan (Hidden Metrics)

Two people on the same salary can walk out of a bank with very different answers. The difference is rarely the headline number on the payslip. It is how much of each person's income the lender is prepared to count, how confident it is that the income will continue, and what is left once tax, living costs and other debts come out. This guide explains how Australian lenders assess income in 2026, which types of income get discounted, and what documents tend to make the assessment smoother.

What income do lenders actually use?

Lenders do not stop at gross salary. Most banks run a net income surplus model: a calculation of the income left after tax, living expenses and financial commitments, which APRA defines in its prudential practice guide APG 223 Residential Mortgage Lending. If that surplus stays positive at the lender's stressed interest rate, the loan can be serviced on paper.

APG 223 tells banks to discount or disregard temporarily high or uncertain income, and to adjust seasonal or variable income. It names the usual suspects: bonuses, overtime, rental income, other investment income and variable commissions, and in some cases child support, social security payments, pensions and superannuation income. APRA describes a discount of at least 20% on most types of non-salary income as prudent practice, with higher discounts where appropriate.

So the real question is not "what do you earn?" but "what will this lender count, after its haircuts, and how sure is it?" The answer depends on the type of income.

How are different types of income treated?

The table below summarises the typical approach. Each lender sets its own policy within these guidelines, so treat it as a map rather than a rulebook.

A worked illustration shows why this matters. Someone earning a $90,000 base salary plus $20,000 of regular overtime might think of themselves as a $110,000 earner. If a lender applies a 20% discount to the overtime, it counts $16,000 of it, so the assessed income is $106,000. A lender with a stricter policy, or one that wants a longer overtime history, could count less. These figures are illustrative only.

How do lenders verify your income?

Verification is a legal requirement, not a formality. Under the responsible lending obligations in the National Consumer Credit Protection Act, lenders and brokers must make reasonable inquiries about your situation and take reasonable steps to verify it. ASIC's Regulatory Guide 209 (issued December 2019) lists the kinds of evidence that can be used:

• PAYG employees: recent payslips, confirmation of employment from the employer, recent tax returns and bank statements showing incoming pay.
• Casual or seasonal workers: more documents covering a wider period, so the lender can see the average rather than an unusually busy stretch.
• Government payment recipients: Centrelink statements and bank statements.
• Self-employed people: recent tax returns, Business Activity Statements, an accountant's statement of actual or likely income, business financial statements and bank statements.

APG 223 adds that banks would usually confirm whether you are permanent, casual, part-time, a contractor or on a fixed-term contract, and may check your credit history through a credit reporting body. A PAYG employee, in plain terms, is someone whose employer withholds tax from each pay ("pay as you go"). That status is the simplest to verify, which is one reason salary carries the most weight.

How do banks assess self-employed income?

APRA notes that self-employed borrowers are generally harder to assess because their income tends to be less certain. In practice that means lenders look at what the business pays you after expenses, as shown in tax returns and financial statements, rather than what flows through the business account. Turnover is not income.

APG 223 also allows a bank to use the lowest documented value of variable income over several years, or a 20% discount on the average. For a business owner whose profit has risen sharply, that can mean the most recent, best year is not the figure the lender relies on. Some lenders offer alternative documentation (often called low-doc) loans for borrowers who cannot provide standard records; APRA expects those loans to be justified by the borrower's situation, not by reluctance to provide documents.

If you run a business, NewGen Finance Brokers' self-employed home loan questions walk through the documents and terms that come up, such as add-backs and BAS (NewGen is TodayForge's sister business, and an enquiry there is free and doesn't commit you to a loan).

How is rental income and investment income counted?

Expected rent from a residential property is commonly included, but APRA's view is that prudent policies apply a minimum 20% haircut, with larger haircuts where vacancy risk is higher. A property expected to rent for $600 a week ($31,200 a year) would contribute no more than about $24,960 to the assessment under a 20% haircut, before any further adjustments the lender makes. Lenders also lean more on actual rental receipts than on an agent's estimate.

Investment income such as dividends and interest falls into the same "discount it" category. APRA also says banks should consider likely changes ahead, such as lower income in an approaching retirement, and should not rely on a future superannuation lump sum unless it is verifiable and reasonably imminent.

What are the hidden metrics beyond income?

Income is only one side of the surplus calculation. Three other inputs quietly shape the result:

• Living expenses. APRA expects banks to use the greater of your declared expenses or a scaled benchmark such as the Household Expenditure Measure (HEM). Understating spending does not help; it is replaced by the floor.
• Existing commitments. Card limits, personal loans, buy now pay later and HELP debt all reduce the surplus. How to increase your borrowing power covers how each one is assessed and the 3 percentage point serviceability buffer.
• The assessment rate. Repayments are tested at your rate plus a buffer, so a higher cash rate, now 4.60% after the Reserve Bank's increase effective 30 September 2026, flows through to a higher assessed repayment.

How can you prepare your income documents before applying?

1. Gather the last few payslips with year-to-date totals. They show base pay, overtime and allowances separately, which lets the lender count each correctly.
2. Download your ATO income statement and notices of assessment. These are central for anyone with variable income or self-employed earnings.
3. Keep income landing in one account. Bank statements that show regular salary credits make verification simpler.
4. Build a track record for variable income. If overtime, bonuses or commissions matter to your numbers, a longer documented history usually helps.
5. Get business records up to date. Lodged tax returns, current BAS and an accountant's letter where needed.
6. Write down your real monthly spending. A simple budget, like the 50/30/20 rule, makes declared expenses easy to support.
7. Compare lender policies. Treatment of overtime, casual work, rental income and self-employment differs, so the same documents can produce different results.

What mistakes cause problems at assessment?

• Quoting gross income including every bonus and overtime shift, then being surprised by the assessed figure.
• Changing jobs, or moving from permanent to contract work, just before applying without checking how lenders treat a new role.
• Applying with self-employed tax returns that have not been lodged yet.
• Relying on a rental estimate for a property that has not been tenanted.
• Overstating income or leaving debts off the application. Lenders verify both, and a loan sized on wrong numbers can lead to financial stress.

Once income is sorted, the next questions are usually about deposit size and insurance costs. LMI explained covers buying with less than 20%, and if you already have a loan, refinancing myths covers when switching saves money and when it does not.