How to Dispute an illion Default in Australia: Step-by-Step Guide

Quick Answer: To dispute an illion default in Australia, lodge a formal dispute through illion's free online credit file dispute portal at illion.com.au. Under the Privacy (Credit Reporting) Code 2025, illion must investigate within 30 days and correct or remove the listing if it was recorded incorrectly. If illion retains the default, you can escalate to the OAIC or seek professional legal assistance under the Privacy Act 1988.

You've pulled your illion credit file and found a default you don't recognise — or one you suspect was listed without following the correct process. Maybe the amount is wrong, you never received notice before it appeared, or the debt was settled before the listing date. Whatever the case, you have the right to dispute it.

illion — formerly Dun & Bradstreet Australia — is one of Australia's three credit reporting bodies, alongside Equifax and Experian. Defaults stay on your illion file for five years from the date they're listed. But if a default was recorded incorrectly or in breach of the rules under the Privacy Act 1988, the law requires it to be corrected.

Here is exactly how to dispute an illion default, what the law requires, and when a professional review of the file makes the difference.

What Is illion and How Does It Hold Your Default?

illion is one of three credit reporting bodies in Australia that collect, hold, and share consumer credit information under the Privacy Act 1988 (Cth), Part IIIA. When a creditor reports a default — a debt of $150 or more that is at least 60 days overdue — illion records it on your credit file and retains it for five years from the date of listing.

Under the Privacy (Credit Reporting) Code 2025, which commenced 25 March 2025, illion has strict obligations: it must only hold information that is accurate, up to date, and was reported by the creditor in compliance with the required process. If a creditor failed to follow the correct steps before listing, the listing is invalid and can be challenged.

illion's credit file is separate from your Equifax or Experian file. A default may appear on one bureau's file, two, or all three — and each needs to be disputed independently. Understanding how credit files work across the three bureaus helps you know exactly where the listing sits.

When Is an illion Default Legally Challengeable?

A default on your illion credit file is challengeable where the listing breached the required process under the Privacy Act 1988, Part IIIA, or the Privacy (Credit Reporting) Code 2025. Four grounds account for most successfully removed listings:

A fifth ground covers identity errors — defaults listed in your name for a debt belonging to someone else, including identity fraud. If none of these apply, and the creditor followed every step correctly, the listing cannot be removed before the five-year retention period ends. Being honest about that is part of how we work. For a full breakdown, see what are valid grounds to dispute a default in Australia.

How to Get Your illion Credit File

Before you can dispute, you need the file in front of you. illion must provide one free credit report per year; you can also request one within 90 days of a credit refusal.

To access your illion credit file:

1. Go to illion.com.au
2. Navigate to "Credit Reports" and select "Get your free credit report"
3. Verify your identity using your driver licence or passport details
4. Your file will be displayed online or emailed, usually within minutes

Review every listing carefully — the creditor name, the listed amount, and the date. Screenshot or download the default entry before you begin the dispute process.

How to Lodge a Formal Dispute with illion

Once you've identified the error, lodge a formal dispute through illion's online portal. The process is free. You don't need to pay a third party to submit a dispute to illion on your behalf.

Step by step:

1. Go to illion.com.au and find the credit file dispute section (within the same credit services portal where you accessed your report)
2. Describe the specific error in writing — be precise: "The listed amount is $X; the correct outstanding amount was $Y at the time of listing" or "I did not receive a Section 21D pre-listing notice at my address before this default appeared"
3. Attach supporting evidence — bank statements showing payment, proof of your correct address at the relevant time, correspondence with the creditor, any notice you received (or evidence you didn't receive one)
4. Submit the dispute
5. Keep a copy including the date lodged — you'll need this if you escalate

illion must acknowledge receipt within 5 business days under the Privacy (Credit Reporting) Code 2025.

How Long Does illion Take to Investigate a Default Dispute?

illion must complete its investigation within 30 days of receiving your dispute under the Privacy (Credit Reporting) Code 2025, which commenced 25 March 2025. This is a statutory obligation — not a service target.

During that window, illion contacts the credit provider (the creditor that reported the default) and asks it to verify the accuracy of the listing. The creditor must respond. If the creditor cannot substantiate the listing or fails to respond within the investigation period, illion is required to remove or correct it.

At the end of the investigation, illion notifies you in writing of the outcome: whether the listing has been corrected, removed, or retained as originally recorded. If illion marks the listing as "disputed" while the investigation is ongoing, lenders reviewing your file can see that a challenge is in progress.

What Happens If illion Doesn't Remove the Default?

If illion's investigation concludes with the default retained, and you still believe it was listed incorrectly, two further paths remain.

Request a statement of amendment. illion can add a note to your file recording your position. It doesn't remove the default, but it puts your version of events on record — lenders can see it when they pull your file.

Escalate to external dispute resolution or the OAIC. Under the Privacy Act 1988, you have the right to escalate an unresolved complaint to external dispute resolution. The OAIC (Office of the Australian Information Commissioner) can also investigate a potential breach of the Privacy Act where illion or the creditor failed to meet their obligations — see how to escalate a default dispute to the OAIC in Australia for the step-by-step process.

If the default relates to a debt you're still struggling with, the National Debt Helpline on 1800 007 007 offers free financial counselling — independently of any credit repair process.

If the creditor itself is the source of the breach — for example, it listed the default without a valid Section 21D notice — the dispute is really a challenge of the creditor's conduct. That's where the investigation often needs to go deeper than a standard bureau form.

When a Lawyer-Led Dispute Gets Further

illion's own investigation relies on what the creditor reports back. If a creditor responds and says "the listing is correct," illion will typically retain it — even where the underlying listing process was technically flawed. That's not illion's fault; it's a question of legal leverage.

Australian Credit Solutions holds Australian Credit Licence ACL 532003 and operates under the Privacy Act 1988. Our solicitor reviews the original creditor file — the Section 21D notice itself, the dispatch address, the listed date, the amount recorded — against the legal requirements of Part IIIA and the Privacy (Credit Reporting) Code 2025. Where a breach is found, a formal legal submission to illion and the creditor carries different weight to a self-lodged consumer dispute.

If you've already submitted a dispute with illion and it was rejected, that doesn't close the matter. It means the evidence on the table at the time wasn't sufficient. Our default removal services involve reviewing the original submission and rebuilding the case before re-engaging.

Representative Example (details changed for privacy)

A client approached us after illion retained a $3,200 telecommunications default following her own dispute. She had provided evidence of payment, but the creditor confirmed the listing as accurate. Our solicitor reviewed the original Section 21D notice the creditor held on file and found it had been sent to an address the client had vacated six months earlier — after she had notified the creditor of her change of address in writing. Under the Privacy (Credit Reporting) Code 2025, a pre-listing notice dispatched to an outdated address after a formal address change has been notified is not a valid Section 21D notice. We put that submission to illion formally. The default was removed. The process took 47 days from our engagement.

Frequently Asked Questions

Can I dispute an illion default for free in Australia? Yes — disputing an illion default is entirely free. illion is required by the Privacy Act 1988 (Cth) to provide a dispute mechanism at no cost to consumers. You lodge a written dispute through illion's credit services portal at illion.com.au, and illion must investigate within 30 days under the Privacy (Credit Reporting) Code 2025. No paid intermediary is required to submit the initial dispute.

How long does illion take to investigate a default dispute in Australia? illion must complete its investigation within 30 days of receiving your dispute under the Privacy (Credit Reporting) Code 2025, which commenced 25 March 2025. In straightforward cases the outcome may come sooner; where illion needs to contact the creditor and wait for records, it can take the full 30 days. If illion doesn't respond within the statutory window, contact the OAIC.

What are valid grounds to dispute an illion default? The most common valid grounds under the Privacy Act 1988 are: the creditor did not send a valid Section 21D pre-listing notice; the listed amount is incorrect; the default was listed before the debt was 60 days overdue; the debt was paid before the listing date; or the listing belongs to someone else. For the full breakdown, see our guide on valid grounds to dispute a default in Australia.

Does disputing an illion default affect my credit score? Lodging a dispute with illion does not itself reduce your credit score. While the investigation is ongoing, illion may mark the listing as "disputed" on your file — lenders can see this notation. It isn't a negative mark; it shows a legitimate challenge is in progress. If the dispute succeeds and the listing is removed or corrected, your credit score typically improves.

What if illion says the default is correct but I still believe it was listed unfairly? If illion retains the listing after its 30-day investigation, you can: (1) request illion add a statement of amendment to your file recording your position; (2) escalate to external dispute resolution or the OAIC under the Privacy Act 1988; or (3) seek a professional legal review of the original listing — a rejected self-dispute doesn't preclude a lawyer-led challenge if a technical breach in the creditor's process exists.

How is an illion dispute different from disputing with Equifax or Experian? All three credit reporting bodies — illion, Equifax, and Experian — operate under the same Privacy Act 1988 framework and the Privacy (Credit Reporting) Code 2025, so the legal rules are identical. The practical difference is that each bureau runs a separate portal and internal process. A default may appear on only one bureau's file, so you dispute only with the bureau that holds it. Compare the process with how to dispute an Equifax default and how to dispute an Experian default.

What evidence do I need to dispute an illion default? The evidence needed depends on the grounds. For a Section 21D notice challenge: proof of your correct address and any change-of-address notifications to the creditor. For an amount dispute: bank statements and the original account balance showing the correct figure. For a paid-debt dispute: payment receipts, bank transactions, or a settlement confirmation showing the debt was cleared before the listing date. Specific, documentary evidence is what causes a creditor to concede.

What is illion formerly known as? illion was formerly known as Dun & Bradstreet (Australia) Pty Ltd. It rebranded to illion in 2018 and operates as a credit reporting body under the Privacy Act 1988 (Cth), Part IIIA. illion holds credit information for millions of Australian consumers, including defaults, credit enquiries, repayment history information, and court judgements, each subject to separate retention periods.

How do I know if my default is on my illion file or another bureau's file? A default may appear on your illion file only, on one or two other bureaus' files, or on all three — it depends on which bureau the creditor reports to. Get your free credit file from each bureau separately: illion at illion.com.au, Equifax at equifax.com.au, and Experian at experian.com.au. Checking all three takes less than 30 minutes and is free. Each bureau's file is independent; a dispute with illion has no effect on a Equifax or Experian listing of the same debt.

What to Do Next

If you've found a default on your illion credit file, the first step is to determine whether it was listed correctly. Get the file, review the listing against the Section 21D notice rules under the Privacy Act 1988 and the Privacy (Credit Reporting) Code 2025, and gather your evidence.

If you believe a breach occurred, lodge a dispute with illion directly — it's free and takes about 20 minutes. If illion rejects the dispute or the matter requires a closer legal review, Australian Credit Solutions can assess the full picture.

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Australian Credit Solutions Pty Ltd holds Australian Credit Licence ACL 532003. Credit repair services are subject to individual assessment. Results may vary. This article provides general information only and does not constitute legal or financial advice.

Related reading: How to Dispute an Equifax Default → | How to Dispute an Experian Default → | Valid Grounds to Dispute a Default →