Base salary is neat. Variable pay is messier. When a borrower earns overtime, annual bonuses or sales commission, the bank does not usually take the headline figure and drop it straight into the calculator. It asks a colder question: will this income probably continue after settlement?
That is the centre of a variable income home loan assessment. The lender wants history, stability, documents and a sensible explanation for any jumps or falls. At Empower Money, we often see strong applicants look weaker on paper because their extra earnings are irregular or poorly documented.
Why Banks Treat Variable Income Differently
Borrowing Power Depends On Reliable Income
Australian lenders assess whether a borrower can meet repayments under stressed conditions, not just under today’s budget. That matters in 2026 because rates are still pressing on household cash flow. The RBA cash rate target is 4.10 percent, effective from 18 March 2026, and the RBA’s January 2026 lender data showed new owner occupier principal and interest housing loans at 5.42 percent on average before the March rise flowed through fully.
Variable income sits under a brighter lamp because it can shrink quickly. Overtime may depend on rosters. Bonuses may depend on company profit. Commission may depend on sales volumes, targets and industry cycles. A borrower might genuinely earn $120,000 in a strong year, but a bank may only use part of that amount if $30,000 came from uncertain extras.
The Serviceability Buffer Shapes The Assessment
APRA has kept the mortgage serviceability buffer at 3 percentage points. That means many lenders must test whether the borrower can afford repayments at a rate above the actual loan rate. APRA said the setting remains appropriate because of risks around labour markets, inflation, interest rates, cost of living pressure and household debt.
This is why the same income can produce different borrowing outcomes across lenders. The base wage is usually straightforward. Extra income is where policy bites. If a lender shades bonus income to 80 percent, a $20,000 bonus becomes $16,000 for serviceability. If another lender ignores the bonus because it has only been paid once, the same borrower may qualify for a smaller loan.
How Lenders Calculate Overtime, Bonuses And Commission
Overtime Income Treatment
Overtime is strongest when it is regular, industry standard and clearly shown on payslips. Nurses, police officers, transport workers, emergency service workers and some resources employees may have overtime that feels almost baked into the job. Even then, the lender wants evidence.
Macquarie’s broker guidance says overtime, bonus and commission income is typically shaded to 80 percent, while essential services overtime may be considered at 100 percent. It also says the income needs to be ongoing and a condition of employment.
The practical point is simple. Overtime that appears every pay cycle has a better chance than overtime caused by a temporary staff shortage. A lender may annualise year to date overtime, average it over a longer period or use the lower figure when the recent pay run looks unusually high.
Bonus Income Treatment
Bonuses need a track record. A one off joining bonus, retention payment or special pandemic payment is usually weak for borrowing power because it does not prove future income. A recurring annual performance bonus is stronger, especially when the borrower can show two years of payments.
NAB’s income verification guidance shows the type of proof a major Australian bank may expect. It says bonus income can be verified using bank statements, payslips or an employer reward statement showing bonus payments for the past two years. For overtime or commission, it points to year to date evidence covering at least six months, or supporting material such as a PAYG income statement, tax return or employer letter where the history is shorter.
For a variable income home loan, timing can matter. A borrower who applies just before the annual bonus lands may lose usable income that could have helped. A borrower who waits until the payment appears on a payslip or bank statement may have a cleaner file.
Commission Income Treatment
Commission is assessed with the most suspicion when it moves sharply from month to month. A real estate agent, car salesperson, recruiter or business development manager may have a high earning ceiling, but the lender wants a floor it can trust.
Some banks average commission over the year to date period. Some compare the current year with the previous financial year. Some shade the figure. Some ask for an employer letter that explains the commission structure and whether the payment is ongoing. The bank may also question a sudden spike, especially if the industry is cyclical or the borrower recently changed employers.
Empower Money can help package the income story so the lender sees the pattern, not just the messy pay lines.
Documents That Help Banks Trust Variable Income
Evidence Banks Commonly Review
A lender does not want a speech. It wants documents that line up. The payslip should match bank credits. The employer letter should match the role. The tax return should not tell a different story from the income statement. Useful documents often include:
- Recent payslips showing base wage, year to date income and separate overtime, bonus or commission lines.
- PAYG income statements, ATO notices of assessment, tax returns, employer letters, commission statements and bank statements showing deposits.
This paperwork matters because variable work is not rare. ABS data for August 2025 reported 2.4 million casual employees, equal to 19 percent of employees, and 1.1 million independent contractors, equal to 7.6 percent of employed people. The same release put median employee earnings in the main job at $1,425 per week. When a large share of the labour market has flexible or less predictable income, lenders lean harder on evidence.
Common Gaps That Reduce Borrowing Capacity
The most damaging gaps are usually boring ones. The payslip does not show year to date figures. The bonus appears in the bank account but not on a payslip. The employee changed jobs three months ago. The commission is paid through a separate entity. The borrower had parental leave, unpaid leave or a role change that makes the prior year look lower.
Lenders are not always saying the borrower cannot afford the loan. They may simply say the income cannot be verified under policy. A strong application does not ask the assessor to guess.
Application Timing And Borrower Strategy
The Best Time To Apply
The best time to apply is usually after variable income has been received, recorded and repeated. For overtime, that may mean waiting until the year to date payslip covers enough months to show a normal pattern. For bonus income, it may mean applying after the annual bonus appears and prior year evidence is ready. For commission, it may mean choosing a period when the rolling average fairly reflects normal sales activity.
Housing schemes can make the deposit side easier, but they do not remove the serviceability test. Housing Australia says the Home Guarantee Scheme allows eligible buyers to buy with a 2 percent or 5 percent deposit, depending on the guarantee type, and avoid LMI because the guarantee protects the lender. It also says borrowers must still meet the lender’s own lending criteria. From 1 October 2025, the expanded 5 percent deposit scheme had unlimited places, higher property price caps and no income caps for eligible first home buyers.
A Practical Pre Application Checklist
Before applying for a variable income home loan, borrowers should get the file tidy before the bank asks for more information.
- Check whether the latest payslip shows year to date overtime, bonus or commission clearly.
- Collect the past two financial years of income evidence where bonus or commission is material.
- Ask the employer for a letter confirming the role, start date, pay structure and whether the extra income is regular.
- Reduce credit card limits and personal debts if they are dragging down serviceability.
- Compare lender policy before submitting, because a declined application can waste time and weaken confidence.
This does not mean waiting forever. It means applying when the paper trail is at its strongest. A good broker should tell a borrower whether the issue is income, deposit, debt, lender choice or timing.
FAQ
Can Overtime Be Used For A Home Loan?
Yes. It is strongest when it is regular, ongoing and shown clearly on payslips. Some lenders shade overtime, while some may treat essential services overtime more favourably.
Do Banks Count All Bonus Income?
Not always. Many lenders want a history of bonus payments and may shade the amount used for serviceability. A one off bonus is less useful than a repeated annual bonus.
How Is Commission Income Assessed?
Banks usually look for consistency. They may average commission, compare it with prior year income and discount it if it is volatile.
Can A Variable Income Home Loan Be Approved With Only Six Months Of Evidence?
Sometimes, but it depends on the lender, job type and income pattern. Six months may help for overtime or commission, while bonus income often needs longer history.
Does A Higher Deposit Help If Income Is Variable?
Yes, but only up to a point. A higher deposit can reduce LMI risk and loan size, but the borrower still needs to pass serviceability.
Sources
https://www.rba.gov.au/statistics/interest-rates/
https://www.apra.gov.au/news-and-publications/apra-announces-update-on-macroprudential-settings
https://www.nab.com.au/personal/credit-cards/post-app-income-verification-page
https://www.housingaustralia.gov.au/home-guarantee-scheme
