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How SIRA Handles Partial Fault in NSW CTP Claims: Shared Liability Explained

This article explains how SIRA calculates shared liability for partial fault claims under the NSW Motor Accident Injuries Act 2017. It outlines how fault percentages affect compensation, contrasts SIRA’s approach with common law principles, and provides practical guidance for claimants. Understanding these rules is essential for anyone involved in a partial fault motor accident.

Current as at 17 October 2026

How SIRA Handles Partial Fault in NSW CTP Claims

If you were injured in a motor accident where more than one party contributed to the crash, the New South Wales Compensation and Injury Registration Authority (SIRA) determines how liability is split. This article explains how SIRA calculates shared liability for partial fault claims under the Motor Accident Injuries Act 2017 (MAIA), focusing on practical examples and how this differs from common law principles.

NSW CTP Rules for Partial Fault Claims

Under the MAIA, CTP claims in NSW are governed by the principle of shared liability. SIRA calculates the percentage of fault for each party involved in the accident. For example, if a driver ran a red light (60% fault) and a pedestrian jaywalked (40% fault), the claimant would receive 60% of the compensation for injuries. This approach ensures that compensation reflects the relative contribution of each party to the accident.

SIRA’s guidelines emphasize that fault is determined based on objective evidence, such as police reports, witness statements, and traffic camera footage. The process does not consider subjective factors like intent or fairness, focusing instead on what actually happened. This differs from common law, where contributory negligence could reduce damages based on the claimant’s own actions.

Practical Implications of Shared Liability

Shared liability affects the amount of compensation you receive. If you are found to be partially at fault, your claim may be reduced by the percentage of your own fault. For instance, if you were 30% at fault for a collision, you would receive 70% of the total compensation. This is distinct from common law, where a claimant’s own negligence could entirely bar recovery.

SIRA also applies this principle to threshold injuries. If your injuries fall within the soft-tissue injury category (e.g., whiplash), the 52-week statutory benefit period applies. However, shared liability calculations remain unchanged, meaning your compensation is reduced proportionally to your fault.

How SIRA’s Approach Differs from Common Law

In common law claims, contributory negligence can reduce damages based on the claimant’s own fault. For example, if you were 20% at fault, you might receive 80% of the compensation. However, under the MAIA, SIRA’s shared liability model applies only to CTP claims, not common law damages. This means that in CTP claims, the percentage of fault directly reduces the compensation, whereas in common law cases, the reduction is not as straightforward.

A key distinction is that SIRA’s approach is predictable and formulaic, while common law principles are more subjective. This makes it easier for claimants to understand how their compensation is calculated under the MAIA.

Example: Shared Liability in Action

Consider a scenario where two drivers collide at an intersection. Driver A ran a red light (70% fault), and Driver B failed to yield (30% fault). Under SIRA’s rules, the claimant (Driver B) would receive 70% of the compensation for injuries. This is because the fault is split based on the drivers’ actions, not the severity of injuries or subjective factors.

This example illustrates how SIRA’s approach ensures that compensation is proportional to the fault of each party, providing clarity in cases of shared liability.

Time Limits and Dispute Resolution

You have three years from the date of the accident to make a CTP claim under the MAIA. If you fail to notify SIRA within this period, you may lose your right to claim compensation. It is crucial to act promptly, especially if the accident involved multiple parties or complex fault assessments.

Disputes over fault or compensation can be resolved through SIRA’s internal review process or by applying to the NSW Civil and Administrative Tribunal (NCAT). However, these options are only available if the claim is within the three-year time limit.

When to Seek Legal Advice

If you are unsure about how your fault percentage affects your compensation, or if you believe SIRA’s liability split is unfair, it is advisable to consult a solicitor. A lawyer can help you understand your rights and ensure that your claim is processed correctly under the MAIA.

Next Steps

Understanding how SIRA calculates shared liability is essential for anyone involved in a partial fault motor accident. While the MAIA provides a clear framework for determining compensation, the process can be complex, especially when multiple parties are involved. If you have questions about your specific circumstances, seek professional advice to ensure you receive the compensation you are entitled to.

Every claim depends on its own facts. To request contact about your circumstances, complete the quick, no obligation enquiry form.

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