How lenders actually calculate your borrowing power.

When you apply for a home loan in Australia, lenders don’t just look at your income and the advertised interest rate. They run a detailed serviceability assessment designed to test whether you could still afford the loan if interest rates rose significantly.

In 2026, with the RBA cash rate holding at 4.35% and typical variable home loan rates sitting between 5.89% and 6.50%, many borrowers are surprised by how much (or how little) they can actually borrow. The single biggest factor limiting borrowing power for most people is the APRA-mandated 3% serviceability buffer.

This article explains exactly how lenders calculate your borrowing power in 2026. We cover the 3% buffer in detail, how the Household Expenditure Measure (HEM) works, the new debt-to-income (DTI) cap introduced in February 2026, recent HECS/HELP changes, and practical examples using realistic Australian figures.

Understanding these rules helps you set realistic expectations and identify legitimate ways to improve your position before applying.

If you would like a personalised borrowing capacity assessment based on your actual numbers, book a free, no-obligation consultation with one of our brokers.

Table of Contents

• What “Borrowing Power” Actually Means in 2026
• The APRA 3% Serviceability Buffer Explained
• How Lenders Assess Your Income
• Expenses: HEM vs Your Actual Spending
• Existing Debts and Liabilities
• The New DTI Cap (February 2026 Onwards)
• HECS/HELP Changes and Their Impact
• Credit History and Other Factors
• Realistic Borrowing Power Examples
• What Most Borrowers Get Wrong
• How to Maximise Your Borrowing Power Legitimately
• Expert Tips from Finstac Brokers
• FAQs
• Conclusion and Next Steps

What “Borrowing Power” Actually Means in 2026

Borrowing power is the maximum amount a lender is willing to approve you for, based on their assessment of your ability to repay the loan comfortably under stressed conditions.

It is not the same as how much you might feel you can afford. Lenders are required by APRA (the Australian Prudential Regulation Authority) to apply conservative stress testing. This protects both you and the financial system from over-borrowing.

Even if interest rates are stable or expected to fall, the regulatory buffer remains in place.

The APRA 3% Serviceability Buffer Explained

This is the most important concept in borrowing power calculations.

APRA requires all authorised deposit-taking institutions (banks and most lenders) to assess whether you could still meet your repayments if the interest rate on your loan increased by at least 3 percentage points above the actual rate being offered.

Example (July 2026):

• You are approved for a loan at 6.2% interest.
• The lender must test your ability to repay as if the rate was 9.2%.
• This stress test is applied to the entire loan amount for the full term (usually 30 years).

Impact: For most borrowers, this single rule reduces borrowing capacity by approximately 15–20% compared to being assessed at the actual interest rate.

The buffer has remained at 3% throughout 2025 and 2026. There is no indication it will be reduced in the near term.

What most borrowers get wrong: Many people assume that if rates are stable or falling, the buffer becomes less relevant. It does not. The buffer is a regulatory requirement, not a forecast of future rate movements.

How Lenders Assess Your Income

Lenders look at gross income but apply different verification standards depending on your employment type.

PAYG Employees

• Most recent payslips (usually last two or three)
• Group certificates or payment summaries
• Sometimes the last two tax returns for stability confirmation

Lenders prefer consistent income. Large fluctuations or recent job changes can reduce assessed income.

Self-Employed Borrowers This group faces stricter scrutiny (covered in more detail in Article 7 of this series). Generally, lenders prefer to see:

• Two years of tax returns and financial statements, or
• One year in some cases with strong supporting evidence (BAS, accountant letters)
• Add-backs for certain expenses (depreciation, interest, one-off costs)

Other Income Sources Rental income is usually assessed at 70–80% of the actual rent received (to allow for vacancies and maintenance). Dividends, bonuses, and overtime are often discounted or excluded unless they are consistent over multiple years.

Expenses: HEM vs Your Actual Spending

Lenders do not simply accept the expenses you declare. They compare your stated living expenses against the Household Expenditure Measure (HEM), a benchmark produced by the Australian Bureau of Statistics and updated regularly.

How it works:

• If your declared expenses are higher than HEM, lenders usually use your actual figures.
• If your declared expenses are lower than HEM, many lenders will use the higher HEM figure anyway.

This conservative approach means that even frugal households are often assessed as having higher living costs than they actually incur.

Key expense categories assessed:

• Food and groceries
• Transport (including car running costs)
• Utilities and communications
• Insurance
• Education and childcare
• Entertainment and recreation
• Personal care and clothing

Large or unusual expenses (private school fees, significant medical costs, or supporting family members) will be examined closely and can materially reduce borrowing power.

Existing Debts and Liabilities

Every existing financial commitment reduces your assessed borrowing capacity. Lenders calculate the monthly repayment on these debts and deduct that from your available income.

Common liabilities that impact borrowing power:

• Credit cards (assessed on the limit, not just the balance — even if paid off in full each month)
• Personal loans and car loans
• HECS/HELP debt (with important 2026 changes — see below)
• Buy Now Pay Later (BNPL) accounts
• Investment loans and margin loans

Credit card strategy tip: Reducing your credit card limits before applying can improve your borrowing power, but only if you do it well in advance. Sudden reductions right before applying can sometimes raise questions.

The New DTI Cap (February 2026 Onwards)

From February 2026, APRA introduced a debt-to-income (DTI) cap for banks.

Banks are now limited in how much lending they can do to borrowers where total debt exceeds 6 times gross annual income.

• Only 20% of a bank’s new lending can go to borrowers above the 6x DTI threshold.
• This has made it harder for high-income earners with large existing debts (or those buying expensive properties relative to income) to get approved at major banks.
• Non-bank lenders are not subject to the same cap and have become more relevant for some borrowers.

This change has tightened lending standards further for certain segments of the market.

HECS/HELP Changes and Their Impact (2025–2026)

Several positive changes have improved borrowing power for people with HECS/HELP debt:

1. Repayment threshold reform (July 2025): HECS repayments are now only calculated on income above $67,000 (instead of the previous lower threshold).
2. Near-clearance rule: Some lenders can now exclude HECS from serviceability calculations if the debt is expected to be paid off within 12 months.

These changes have meaningfully increased borrowing capacity for many graduates and professionals with student debt.

Realistic Borrowing Power Examples (2026)

Example 1: Professional Couple – Brisbane

• Combined gross income: $185,000
• No dependents
• Minimal existing debts
• Good credit history
• Estimated borrowing power: Approximately $850,000 – $950,000 (depending on the lender and exact expense assessment)

Example 2: Single Professional – Melbourne

• Gross income: $110,000
• $25,000 HECS debt (being paid down)
• One credit card with $8,000 limit
• Estimated borrowing power: Approximately $480,000 – $550,000

Example 3: Self-Employed Tradie + Partner – Perth

• Combined income: $160,000 (verified via tax returns + BAS)
• One investment property with small equity
• Estimated borrowing power: Approximately $720,000 – $820,000 (more conservative due to self-employment verification)

These are indicative only. Every lender has slightly different overlays and assessment models.

What Most Borrowers Get Wrong

1. Assuming the advertised rate is what they will be assessed on — The 3% buffer is almost always the biggest constraint.
2. Underestimating living expenses — Many people declare unrealistically low expenses, triggering HEM.
3. Ignoring credit card limits — Even unused limits count against you.
4. Thinking recent pay rises will be fully accepted — Lenders prefer to see the increase reflected over time.
5. Not realising how much the DTI cap affects high earners buying expensive properties.

How to Maximise Your Borrowing Power Legitimately

• Pay down credit card debt and reduce limits early.
• Provide strong evidence of consistent income and expenses.
• Consider adding a guarantor (if eligible) — though this has its own risks.
• Speak to multiple lenders — some are more generous on certain income types or expense assessments than others.
• Time your application strategically (e.g., after a pay rise has been in place for several months).

Important: We never recommend artificially inflating income or hiding liabilities. Lenders have sophisticated verification processes, and misrepresentation can lead to loan rejection or future problems.

Expert Tips from Finstac Brokers

• Always get a pre-approval rather than just a borrowing capacity estimate. Pre-approval involves a more detailed assessment and gives you stronger negotiating power when making offers.
• Different lenders treat self-employed income, rental income, and bonuses differently. Shopping around can add tens of thousands to your borrowing power.
• The 3% buffer makes it even more important to have a buffer in your own budget. Just because a lender approves you doesn’t mean the loan will feel comfortable at higher rates.

FAQs

How much does the 3% buffer typically reduce borrowing power? Usually between 15% and 20%, though it varies depending on loan size, term, and your income-to-expense ratio.

Does the buffer still apply if I fix my interest rate? Yes. The buffer is applied regardless of whether you choose a fixed or variable rate.

Can I get around the HEM by declaring higher expenses? No. Lenders will use the higher of your declared expenses or HEM. Declaring higher expenses will generally reduce your borrowing power.

How does the new DTI cap affect me? If your total debts (including the new loan) would exceed 6x your gross income, you may find it harder to get approved at major banks. Non-bank lenders can sometimes help in these situations.

Will paying off my HECS improve my borrowing power significantly? It can, especially under the new near-clearance rules. Many lenders will now ignore HECS if it will be cleared within 12 months.

Conclusion and Next Steps

Lending assessments in 2026 are more conservative than many people realise. The combination of the 3% APRA buffer, HEM expense benchmarks, the new DTI cap, and careful income verification means your actual borrowing power is often lower than simple online calculators suggest.

The good news is that understanding these rules allows you to plan effectively. Many clients improve their position significantly by making small, strategic changes well before they apply.

At Finstac, we specialise in helping clients understand their true borrowing capacity across multiple lenders. We can run accurate assessments and identify the most suitable options for your situation.

Book a free borrowing capacity review with one of our experienced brokers today. We’ll give you a clear picture of what you can realistically borrow and how to structure it properly.