Unlock the secrets to credit scores and home loans

Your credit score determines whether a lender will approve your application, how much you can borrow, and the interest rate you'll pay.

Lenders use your credit score as a snapshot of your financial reliability. A higher score opens access to lower rates and a wider range of loan products. A lower score can mean higher rates, stricter deposit requirements, or limited lender options. The difference can cost thousands of dollars each year in repayments, so understanding how your score is assessed matters before you apply for a home loan.

How lenders use your credit score to assess risk

Lenders assign a risk weighting to every home loan application, and your credit score is one of the primary inputs. Under APRA's prudential framework, authorised deposit-taking institutions calculate capital requirements based on the risk profile of each loan. A borrower with a credit score below 650 may be classified as higher risk, which can trigger a higher interest rate or require a larger deposit to offset the lender's capital allocation.

Consider a buyer in Brisbane applying for a variable rate owner-occupied loan with a 10% deposit. If their credit score sits at 580, the lender may price the loan at 0.40 to 0.60 percentage points above the standard variable rate offered to a borrower with a score of 750. On a loan amount of $500,000, that margin adds roughly $2,000 to $3,000 in interest each year. The lender may also require lenders mortgage insurance, which is calculated on a sliding scale based on loan amount and LVR. The premium itself can run into the thousands, and some Queensland revenue offices also impose duty on the LMI premium, adding further cost.

Your credit score also influences whether a lender will approve an exception to their standard serviceability policy. APRA requires lenders to assess new borrowers' capacity to service a loan at an interest rate at least 3.0 percentage points above the product rate. If your credit score is strong, a lender may be more inclined to apply discretion where your debt-to-income ratio sits close to the edge of their internal policy. If your score is lower, that discretion narrows.

What actually builds or damages your credit file

Your credit file is maintained by credit reporting bodies and includes records of credit enquiries, repayment history, defaults, court judgments, and bankruptcy information. Payment history now accounts for a significant portion of your score under comprehensive credit reporting, which has been mandatory for major lenders since 2018. Each repayment you make on a credit card, personal loan, or existing mortgage is reported monthly as either on time, one to six months overdue, or in default.

A single missed payment of 14 days can lower your score by 20 to 40 points, depending on your existing profile. Multiple missed payments across different accounts can push your score below the threshold where major lenders will approve a standard home loan application. Defaults over $150 that remain unpaid for 60 days are listed on your file for five years, even if you pay them in full later. Court judgments and bankruptcies remain listed for longer periods and can block access to most mainstream lender products entirely.

Credit enquiries also affect your score. Each time you apply for credit, the lender submits an enquiry to a credit reporting body. Multiple enquiries within a short period signal financial stress or application shopping, and can reduce your score by 10 to 20 points per enquiry. This includes applications for credit cards, personal loans, car finance, and home loans. In our experience, buyers who apply directly to multiple lenders without understanding how enquiries are recorded can damage their score before they reach the right lender.

Improving your score before applying for finance

You can request a free copy of your credit file from any of the major credit reporting bodies operating in Australia. Reviewing your file allows you to identify errors, undisclosed defaults, or accounts you no longer use. Closing unused credit accounts reduces your total available credit limit, which lenders factor into borrowing capacity calculations. If you hold three credit cards with combined limits of $30,000, a lender will assume you could draw that full amount and will assess your serviceability accordingly, even if the cards carry zero balance.

Paying down existing debt has a direct effect on both your credit score and your serviceability. If you carry a $10,000 balance on a personal loan with 24 months remaining, clearing that debt removes roughly $450 to $500 from your monthly committed expenses, which increases the amount a lender will approve. Paying your accounts on time for six consecutive months can lift your score by 30 to 60 points, depending on your starting position. Setting up direct debits for minimum repayments ensures you avoid missed payments during the lead-up to a home loan application.

Avoiding new credit applications in the three to six months before you apply for a home loan prevents additional enquiries from appearing on your file. If you need to compare loan options, work with a broker who can assess your position and approach lenders strategically rather than submitting multiple applications. A broker can also identify non-major lenders who assess credit scores differently or offer manual underwriting for applicants with past defaults or lower scores.

How the debt-to-income limit interacts with credit assessment

APRA activated a debt-to-income lending limit effective from 1 February 2026. Each authorised deposit-taking institution may lend up to 20% of new owner-occupier loans and up to 20% of new investor loans to borrowers with a total DTI ratio of six times or greater. If your gross income is $100,000 and you're applying for a $650,000 loan, your DTI ratio is 6.5. That application falls within the restricted portion of the lender's portfolio.

Lenders manage their DTI allocation carefully, and borrowers with lower credit scores are less likely to be approved within that restricted portion. A lender may choose to reserve their DTI capacity for applicants with strong credit profiles, stable employment, and minimal existing debt. If your credit score sits below 700 and your DTI ratio is above six, you may need to increase your deposit, reduce your loan amount, or seek out a lender with remaining capacity in their quarterly allocation. Non-ADI lenders are not subject to the DTI limit, which can provide an alternative pathway for Queensland buyers who meet responsible lending criteria but fall outside the major banks' risk appetite.

Structuring your application when your score is lower

If your credit score has been affected by past financial hardship, a default, or multiple enquiries, there are still pathways to approval. Some lenders will consider applications from borrowers with defaults under $1,000 that have been paid in full, provided the default is more than 12 months old and your repayment conduct since then has been clear. Other lenders will assess defaults up to $2,500 on a case-by-case basis, particularly where the applicant can demonstrate genuine savings and stable income over the past two years.

Consider a scenario where a buyer in the Sunshine Coast region has a credit score of 620 due to a $1,200 default from a utility account that was paid 18 months ago. The buyer has a 15% deposit, stable employment in the healthcare sector, and no other adverse credit events. A non-major lender may approve the application at a rate 0.30 percentage points above their standard variable rate, with no LMI required due to the deposit size. The buyer's repayment history since the default, combined with the deposit buffer, offsets the lender's risk weighting under their internal credit policy.

If you're applying with a partner or spouse, the lender will assess both credit files. If one applicant has a significantly lower score, some lenders will weight the assessment toward the applicant with the stronger profile, provided that person also has the higher income. In other cases, removing the lower-scoring applicant from the loan application and relying on a single income may result in a lower loan amount but a higher chance of approval. This decision depends on your combined income, the property value, and the lender's policy on joint versus single applications.

Managing your credit after settlement

Once your home loan is approved and settled, your repayment conduct on that loan becomes part of your credit file. Making every repayment on time protects your score and positions you for future refinancing or additional borrowing. If you anticipate difficulty meeting a repayment, contact your lender before the due date. Under section 72 of the National Credit Code, you can request a hardship variation, and the lender must consider your request. A formal hardship arrangement is noted on your credit file differently than a missed payment or default, and it provides a pathway to managing short-term financial pressure without long-term credit damage.

Keeping your credit file clear also matters if you plan to purchase an investment property or upgrade to a larger home in the coming years. Lenders reassess your credit profile with each new application, and a pattern of on-time repayments across multiple accounts strengthens your position. If you're considering taking out a car loan, personal loan, or increasing your credit card limit, assess the timing carefully. New credit commitments reduce your serviceability for a future mortgage application and can delay your ability to act when the right property becomes available.

Call one of our team or book an appointment at a time that works for you. We'll review your credit position, identify any issues that need attention, and structure your application to match lenders who assess your profile fairly.

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