If you’ve ever applied for a home loan and walked away confused about the number the bank gave you, you’re not alone. Borrowing capacity is one of the most misunderstood parts of buying property in Australia, and it’s also the most important. It determines what you can actually afford, not what you wish you could afford.
What is borrowing capacity?
Borrowing capacity is the maximum amount a lender will let you borrow based on your income, expenses, debts, and financial risk profile. It’s not the same as a pre-approval, and it’s definitely not the same as what a mortgage calculator spits out online.
Banks don’t look at how much you think you can repay. They look at how much you can repay if interest rates were 3% higher than today, you lost your job, or your credit card limits were maxed out. That’s called the “serviceability buffer” and it’s mandated by APRA. In 2026, most lenders assess you at your current rate + 3.0%.
How Australian lenders calculate it in 2026
Every bank has its own calculator, but they all look at 5 core things:
| Factor | What lenders check | Why it matters |
|---|---|---|
| Income | Base salary, rental income, bonuses, commissions, government benefits | Lenders use 80% of rental income and usually shade bonuses by 50-80%. Casual income needs 6-12 months history |
| Existing debts | Credit cards, car loans, HECS/HELP, personal loans, other mortgages | Credit card limits count, not just the balance. $10k limit = $300-$380/month expense, even if you owe $0 |
| Living expenses | Groceries, utilities, insurance, childcare, private school fees | Banks use the higher of your declared expenses or the Household Expenditure Measure (HEM) benchmark |
| Dependents | Kids or other people you financially support | Each dependent adds $300-$600+/month to deemed expenses |
| Loan details | Interest rate, loan term, repayment type, LVR | Interest-only loans are assessed as principal & interest over the remaining term, which hurts capacity |
The RBA cash rate at 4.35% means most new owner-occupier loans are assessed at ∼9.0-9.5%. That’s why borrowing power has dropped 20-30% since 2021 for the same income.
Why do two people with the same income get different numbers
- Credit card limits: Person A earns $120k with a $20k card limit. Person B earns $120k with no cards. Person B can borrow ∼$60k-$80k more.
- HECS debt: A $40k HECS debt can reduce capacity by $40k-$70k because repayments kick in once you earn over $54,435.
- Expense habits: If you declare $3,000/month living costs but HEM benchmark for a couple is $3,800, the bank uses $3,800.
9 ways to increase your borrowing capacity
1. Reduce credit card limits or cancel unused cards
Even if you pay your card off monthly, banks assess 3-3.8% of the limit as a monthly expense. Dropping a $15k limit to $5k can add ∼$30k to your borrowing power overnight.
2. Pay down personal loans and car loans
These are expensive debts in the bank’s eyes. A $500/month car payment could be costing you $60k-$80k in borrowing power. Paying it out before applying makes a huge difference.
3. Check your HECS/HELP strategy
You can’t usually pay this off early to help capacity unless the balance is tiny. But if you’re within 1-2 years of clearing it, some lenders will ignore it if you provide evidence you’ll pay it out pre-settlement.
4. Boost assessable income
- Overtime/bonus: Get a letter from the employer confirming consistent overtime over 6-12 months
- Rental income: If you own an investment property, make sure the lease is current. 80% of gross rent counts
- Second job: Needs 6-12 months of history for most lenders
5. Cut discretionary expenses 3 months before applying
Banks look at 3 months of statements. If you can show lower spending on dining out, subscriptions, and “Afterpay”-type services, your declared expenses drop and capacity rises.
6. Extend your loan term
A 30-year term gives lower repayments than a 25-year term, so you can borrow more. You can always pay it down faster later.
7. Add a co-borrower or guarantor
A partner’s income or a family guarantor can boost capacity. Be careful — everyone is liable for the full debt.
8. Choose lenders strategically
Non-bank lenders and some smaller banks use lower assessment rates for investors, or take 90% of rental income instead of 80%. A broker can test 10+ lenders’ policies to find your max.
9. Switch from interest-only to P&I if refinancing
Counterintuitive, but some investors get better capacity on P&I because the bank isn’t forced to assess the loan as P&I over 25 years after a 5-year IO period.
Common traps that kill capacity
- Afterpay/Zip: Banks see 4+ BNPL accounts as financial stress. $200/month in Afterpay can cut $25k from borrowing power.
- Estimating expenses too low: If you say $2,000/month but statements show $4,000, the bank will decline or reduce the loan.
- Applying with multiple lenders: Each application hits your credit file. More than 2-3 in a month looks desperate and can lower your score.
What to expect in 2026
With rates still high, borrowing capacity isn’t bouncing back soon. But two things are helping buyers:
- Stage 3 tax cuts from July 2024 increased net income, which flows into serviceability.
- 5% Deposit Scheme expansion means some first-home buyers can borrow more with LMI waived, effectively lifting what they can purchase.
Still, the RBA has signalled rates will stay “higher for longer” until inflation is back in the band. So the best way to increase capacity is to control what you can: debt, expenses, and loan structure.
Your 3-step action plan
- Week 1: Pull your credit file + 3 months bank statements. List every limit and repayment.
- Week 2: Close unused cards, consolidate debts, and draft a realistic budget you can stick to.
- Week 3: Talk to a broker before applying. They can run your scenario through 20+ lender calculators in 10 minutes and tell you exactly where you stand.
The takeaway: Borrowing capacity isn’t just about income. It’s about how clean your finances look to a bank. Fix the leaks first, then go shopping for a house.
