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MAI Act Transitional Claims: How Insurers Assess Liability in NSW

Insurers assess liability for transitional claims under the MAI Act by applying rules based on the accident date, injury type, and timing of injury progression. Understanding how the MAI Act applies to your specific circumstances is essential to securing fair compensation. Complete the quick, no obligation enquiry form to request contact about your claim.

Current as at 17 October 2026

How Insurers Evaluate Liability for Transitional Claims Under the MAI Act

If you've been injured in a motor accident that occurred before and after 1 December 2017, your claim may fall under the transitional regime of the Motor Accident Injuries Act 2017 (MAI Act). Insurers assess liability for these claims by applying specific rules to determine which legal framework applies to different parts of your injury. Understanding how insurers evaluate liability is critical to securing fair compensation.

Key Factors in Liability Assessment

Insurers consider three main factors when determining liability for transitional claims:

  • Date of the accident: The MAI Act replaced the old Motor Accidents Compensation Act 1999 (MACA) on 1 December 2017. Accidents occurring before this date are governed by MACA rules, while those after are subject to the MAI Act.
  • Nature of the injury: Threshold injuries (soft tissue injuries with minimal impairment) and whole person impairment (WPI) claims are treated differently under the two regimes. Insurers must apply the correct legal test for each type of injury.
  • Timing of the injury: If your injury resulted from an accident before 1 December 2017 but worsened after that date, insurers must apply the MAI Act rules to the worsening part of your condition.

How Transitional Claims Differ From Standard CTP Claims

Transitional claims are more complex than standard CTP claims because they involve two legal regimes. Insurers must:

  • Apply MACA rules to injuries caused by pre-2017 accidents
  • Apply MAI Act rules to injuries caused by post-2017 accidents
  • Determine whether the injury worsened after 1 December 2017

This dual application means insurers must carefully document how each part of your injury falls within the relevant legal framework. For example, if you suffered a threshold injury in a 2016 accident but later developed a whole person impairment, the insurer must apply MACA rules to the threshold injury and MAI Act rules to the WPI.

What SIRA Guidance Reveals About Liability Assessments

SIRA's guidance on transitional claims clarifies that insurers must:

  • Use the date of the accident to determine which legal regime applies
  • Apply the correct injury threshold tests for each regime
  • Consider how injuries may have worsened after 1 December 2017

SIRA also warns that insurers may challenge claims by arguing that injuries fall within the threshold injury definition of the relevant regime. This means claimants must provide clear evidence of the injury's progression and the date of each injury component.

Practical Steps to Support Your Claim

To help insurers assess your claim accurately, you should:

  • Provide detailed medical records showing the date of each injury component
  • Document how your condition worsened after 1 December 2017
  • Supply evidence of the accident date and circumstances

If you're unsure how your injury fits within the transitional regime, seek legal advice. An experienced solicitor can help you understand how the MAI Act applies to your specific circumstances.

When to Seek Legal Advice

Transitional claims are complex, and insurers may try to limit your compensation by applying the wrong legal framework. If you're unsure whether your claim falls under the transitional regime or need help proving how your injury fits within the correct legal test, contact a legal professional. They can help you understand your options and ensure your claim is assessed correctly under the MAI Act.

Next Steps

Time limits and procedural requirements may apply to transitional claims. To request contact about your circumstances, complete the quick, no obligation enquiry form.

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