The first thing most people do after a credit knock-back is Google "how to fix my credit score" — and then spend the next hour reading generic tips that don't explain what actually matters to a mortgage lender. This guide cuts through that.
Australian mortgage lenders don't just look at your score — they look at the pattern of your credit file. The age of listings, whether defaults are paid or unpaid, recent conduct vs historical conduct, and how many enquiries are on file. Understanding this is the difference between spending two years doing the wrong things and being mortgage-ready in 12 months.
Step 1: Get Your Credit Report — From All Three Bureaus
Most people get one credit report. This is a mistake. Australia has three major credit reporting bodies — Equifax, Experian, and illion — and different lenders report to different bureaus. A negative listing that's wiping 80 points off your Equifax score might not even appear on your Experian file.
You're entitled to one free report from each bureau every 12 months. Request all three simultaneously so you have a complete picture. You're also entitled to a free report within 90 days of being declined for credit.
Once you have all three reports, look for:
- Defaults — listed when an account is more than 60 days overdue and the creditor has issued a 14-day notice
- Serious credit infringements — unpaid debts where the creditor couldn't locate you
- Court judgments and writs — from unpaid debt proceedings
- Enquiries — every time you've applied for credit, even if it was declined
- Repayment history — under comprehensive credit reporting, lenders can see 24 months of payment history
- Incorrect listings — the single most impactful and fastest fix
Step 2: Dispute Every Error Immediately
Credit reporting errors are far more common than most people realise — one study found errors in roughly 1 in 5 Australian credit files. Common errors include: defaults listed against the wrong person (same name, different person), defaults that were actually paid but listed as unpaid, listings from accounts you didn't open (identity fraud), and credit enquiries you didn't authorise.
The dispute process is free and the credit reporting body is legally obligated to investigate within 30 days. If the listing is found to be incorrect, it's removed entirely — not just corrected. This is the fastest way to improve your score because the removal is retroactive.
To dispute: contact the credit reporting body (Equifax, Experian, or illion) directly via their website, providing the listing details and the reason for the dispute. You can also contact the credit provider (e.g. the bank or utility company) to request they correct or remove the listing directly.
Step 3: Pay Outstanding Defaults — Even If They Stay on File
This is a common point of confusion. Paying a default does not remove it from your credit file — it changes the status from "unpaid" to "paid", and the listing remains for 5 years from the date it was first listed.
But here's why it still matters enormously: the vast majority of specialist lenders who will consider bad credit home loan applications will only look at paid defaults. Unpaid defaults — regardless of the amount — are a deal-breaker for most lenders. The moment you pay the debt, your lender options expand immediately.
Default status vs lender eligibility
Step 4: Stop Making New Credit Applications
Every time you apply for credit — a credit card, car loan, buy-now-pay-later account, or home loan — the lender makes a "hard enquiry" on your credit file. Each enquiry reduces your score and is visible to every subsequent lender for 5 years.
Multiple enquiries in a short period send a signal to lenders that you've been shopping for credit (and potentially being declined). If you're planning to apply for a mortgage in the next 12 months, the rule is simple: make no new credit applications. That includes:
- New credit cards or limit increases
- Personal loans or car finance
- Any buy-now-pay-later platform that performs a credit check
- Mortgage pre-approvals from multiple banks simultaneously
This last point matters: if you're rate shopping, use a mortgage broker who can identify the right lender before lodging an application. A broker's credit assessment (using a serviceability calculator) doesn't create a hard enquiry. Only the formal application does.
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Step 5: Build Positive Credit History
Under Australia's Comprehensive Credit Reporting (CCR) system, lenders can see 24 months of repayment history — not just negative listings. This means positive conduct now actively helps you. Every on-time repayment on a credit card, car loan, or even a BNPL account (if they report to bureaus) adds a positive mark to your file.
If you have no credit history at all — a "thin file" — this can be almost as problematic as bad credit for some lenders, because there's no data for them to assess. Building a thin file is straightforward: get one low-limit credit card, use it for small recurring purchases, pay it in full every month, and keep the limit below $5,000. Two years of perfect repayment history significantly improves assessability.
Step 6: Reduce Your Credit Limits
Many people don't realise that unused credit card limits count against their borrowing capacity. Lenders assess you on what you could draw down, not what you currently owe. A $20,000 credit card limit — even if the balance is zero — can reduce your maximum borrowing capacity by $80,000–$100,000 at most lenders.
Before applying for a mortgage, reduce your credit card limits to the minimum you actually need (typically $3,000–$5,000). The borrowing power calculator on our site lets you model the exact impact of reducing your credit limits before you apply.
Step 7: Stabilise Your Employment
Credit score repair doesn't happen in isolation from the rest of your financial profile. Lenders assessing a repaired credit file will also want to see employment stability alongside the improved score. The ideal position for a mortgage application:
- 12+ months in the same job (PAYG) or 2+ years of the same business (self-employed)
- No gaps in employment history in the last 24 months
- If recently changed jobs: same industry, same or higher income
- Probation period completed (most lenders want probation finished before approving)
The Realistic Timeline
Here's an honest timeline for the most common credit situations we see at Mortgagefy:
Incorrect listing removed
Timeline: 2–8 weeks. Dispute lodged, investigation completes, listing removed. Immediate score improvement. Mortgage options: significantly expanded.
Unpaid default → paid default
Timeline: Immediate status change on file. Specialist lender options open immediately. Full second-tier access typically 6–12 months after payment.
Reducing enquiries / rebuilding score
Timeline: 6–12 months of no new applications. Score climbs as recent enquiries age and positive repayment history accumulates.
Default ages off file
Timeline: 5 years from listing date. Full major bank access restored. This is the "clean slate" — worth waiting for if the timing works.
Can You Apply for a Mortgage While Still Repairing?
Yes — and for many people this is actually the right call. If you have equity in a property, stable income, and paid (not unpaid) defaults, a specialist lender may approve you now at a slightly higher rate. You then refinance to a mainstream lender once your file is clean — the standard two-stage strategy we walk clients through.
This approach can be better than waiting because: (1) property prices don't wait for your credit file to improve; (2) 18–24 months of perfect mortgage repayments is itself the strongest positive signal on your credit file; and (3) the cost of the higher rate for 24 months is often less than the cost of being priced out of the market entirely.
See our detailed guide on refinancing with bad credit if you're currently in a mortgage and looking to move to a better rate, or our overview of bank knockback options if you've already been declined.
The most underused strategy
Book a free broker assessment before you apply anywhere. A broker can pull your credit file (with your consent, no hard enquiry) and tell you exactly which lenders will consider you right now — saving you the score damage of multiple declined applications.
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