Key takeaways
- Serviceability is the lender’s test of whether you can afford the repayments — not just now, but if rates rise.
- Lenders add an interest-rate buffer, so you can borrow less than today’s rate alone suggests.
- Credit-card limits count against you even if the balance is zero.
- Different lenders assess income and expenses differently — the same person can service more with one than another.
Ask “how much can I borrow?” and the honest answer is “how much can you service?” Serviceability is the affordability engine behind every approval: income in, expenses and debts out, a safety buffer applied, and a maximum repayment the lender is comfortable with. Get to know it and your borrowing power stops being a mystery number.
What lenders actually measure
- Income. Stable, provable income — salary, and for the self-employed, business profit. Bonus and overtime are often discounted.
- Living expenses. Your real spending, benchmarked against minimum household estimates.
- Existing debts. Loans, and credit-card limits — which count even if you owe nothing.
- The new repayment. Tested at a buffered rate, not the headline one.
The buffer that shrinks your budget
Lenders don’t assess you on today’s rate — they add a buffer (commonly around three percentage points) and check you could still pay. This is why an online calculator using the current rate overstates what you’ll actually be approved for. The buffer protects you as much as the lender: it’s the reason most borrowers weathered recent rate rises.
Every credit card counts at its limit, not its balance. A $15,000 card you never use can reduce your borrowing power by tens of thousands. Closing or lowering unused card limits before you apply is one of the fastest ways to improve serviceability.
Why the same person gets different answers
Lenders use different living-expense benchmarks, treat bonus and rental income differently, and apply different buffers. That’s why one lender might decline you while another comfortably approves the same loan. Matching your profile to the lender whose policy suits it is the core of what a broker does — and it directly affects your LVR and rate.
Strengthening your position
In the months before you apply: trim discretionary spending, clear or reduce cards and other debts, avoid new commitments, and keep your income steady. Then get a proper assessment and pre-approval before you shop — so your budget is real, not a guess.
What lenders look for
When testing whether you can afford a loan, lenders generally look at:
- Stable, provable income
- Realistic living expenses
- Existing loans and credit-card limits
- The new repayment at a buffered (not headline) rate
- Any other regular commitments
Broker Insight. The same income and expenses can pass comfortably with one lender and fall short with another. We spend a lot of our time matching a client’s profile to the lender whose servicing model suits it best.
Find out what you can genuinely service
We’ll assess your serviceability across 40+ lenders, tell you who’ll lend the most for your profile, and show you how to strengthen it. Free, no credit check to start.
Book your free game plan callFrequently asked questions
What is serviceability in a home loan?
Serviceability is a lender’s assessment of whether you can comfortably meet the repayments from your income after your living expenses and existing debts. Lenders don’t just check today’s repayment — they add a buffer to the interest rate to make sure you’d still cope if rates rose. Pass the test and they’ll lend; the stronger you pass, the more you can borrow.
What is the assessment rate buffer?
Lenders test your repayments at a rate higher than the actual one — typically a few percentage points above — to confirm you could still afford the loan if rates increased. This buffer is why the amount you can borrow is lower than a simple calculation on today’s rate suggests. It’s a regulatory safeguard, and it varies between lenders.
How can I improve my serviceability?
Reduce or close credit cards and other debts (limits count against you even if unused), cut discretionary spending in the months before applying, increase stable income, and clear buy-now-pay-later accounts. Because lenders assess expenses and commitments differently, the same person can service more with one lender than another — which is where a broker adds real value.
This guide is general information only and does not take your personal circumstances into account. It is not financial or credit advice. Government schemes, lender policies, rates and tax rules change over time and eligibility criteria apply. Speak with us for advice tailored to your situation.