If you’ve sat down with an online borrowing calculator lately and come away confused, you’re not alone. Borrowing power in Australia has shifted significantly over the past 18 months, and what you could borrow in 2024 is not necessarily what you can borrow today. This guide explains what actually determines your borrowing capacity in 2026 — in plain terms, without the fine print buried at the bottom.
The two rules that cap your borrowing in 2026
1. The 3% serviceability buffer
Every home loan application in Australia is assessed not at the rate you’ll actually pay, but at your actual rate plus 3 percentage points. This is APRA’s serviceability buffer — a stress test that has been in place since October 2021 and remained at 3% as of June 2026.
With the RBA cash rate at the current cash rate following three consecutive hikes in 2026, variable rates for owner-occupiers are sitting around current variable rates at major lenders. That means banks are currently testing your repayment ability at approximately 3 percentage points above the actual rate — not the rate on the product brochure.
The gap between the real rate and the assessed rate alone can significantly reduce borrowing capacity for most households.
2. The new DTI cap — from February 2026
This is new for 2026 and many borrowers don’t know it exists. In February 2026, APRA formally activated debt-to-income (DTI) limits. From that date, APRA-regulated lenders — which includes all major banks — are required to limit new mortgage lending with a DTI ratio of 6 or above to no more than 20% of their new loans, across both owner-occupier and investor portfolios separately.
In practical terms: if your total debt (including the new loan) would exceed six times your gross household income, your application is in a more restricted pool. Not automatically declined, but harder to get approved — and some lenders have tightened their internal caps further as a result.
Example: As an example: if your total existing debts are significant, your available borrowing under the DTI cap reduces accordingly — before serviceability is even calculated.
What increases your borrowing power
• Paying down existing debts before applying — each dollar of existing monthly repayments reduces your maximum loan by a significant amount
• Choosing the right lender — borrowing capacity varies significantly across lenders for the same financial profile, due to differences in how each lender treats overtime, rental income, and self-employed earnings
• Cleaning up credit card limits — even unused credit card limits are counted in serviceability calculations at a standard utilisation rate
• HECS-HELP debt — if you hold a HECS debt, lenders factor in compulsory repayments. Clearing it before applying (if you’re close to the threshold) can make a measurable difference
• Joint applications — adding a second income can increase borrowing capacity substantially, provided the second applicant has limited existing debts
What lenders actually look at
Beyond income and debts, lenders assess your living expenses against the Household Expenditure Measure (HEM) — a benchmark that estimates baseline costs for different household types. If your declared expenses are significantly lower than the HEM for your household, lenders will use the HEM figure instead. Lenders also assess income type differently: PAYG employment income is taken at face value, while casual income, overtime, and self-employed income are often shaded to 80%–100% depending on the lender.
The right question isn’t just “how much can I borrow?”
The right question is: how much can I comfortably service — and which lender will assess my application most favourably given my specific income and debt mix? Those two answers are often different, and they depend heavily on which lender you apply through and how the application is structured.
A broker with access to 40+ lenders can run your numbers across multiple serviceability models before you apply — identifying which lender gives you the strongest result for your situation, without leaving a trail of credit enquiries on your file.
If you’d like to understand your borrowing capacity in 2026’s current rate environment, speak with the team at Tiger Mortgage. We assess your situation across multiple lenders before recommending where to apply.
Learn more: tigermortgage.com.au/services/residential-loans/
Disclaimer: This article is general information only and does not constitute financial advice. Speak to a licensed mortgage broker about your specific situation.
