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Vehicle Modifications and Liability Assessment in NSW CTP Claims

NSW CTP insurers assess liability based on accident circumstances, not vehicle modifications. Modifications are generally irrelevant unless they contributed to the accident. Claimants should document modifications, provide evidence of their irrelevance, and act promptly. Seek legal advice for complex disputes.

Current as at 6 November 2026

How NSW CTP Insurers Assess Liability for Modified Vehicles

In New South Wales, insurers assess liability for motor accident claims based on the circumstances of the accident, not the vehicle's modifications. Under the Motor Accident Injuries Act 2017 (MAIA), liability is determined by whether the accident involved a motor vehicle and whether the claimant suffered a threshold injury or other eligible harm. Vehicle modifications, such as hand controls or adaptive aids, are generally not relevant to liability unless they directly contributed to the accident. This article explains how insurers evaluate claims involving modified vehicles, the factors they consider, and how claimants can demonstrate that modifications do not affect liability.

Key NSW CTP Rules for Modified Vehicles

NSW CTP claims are governed by the MAIA, which outlines how insurers assess liability and determine compensation. Key principles include:

  • Liability is not affected by vehicle modifications: Unless a modification directly caused or contributed to the accident, insurers cannot use it to deny liability. For example, a hand control aid installed after an injury does not impact the assessment of liability for a pre-existing accident.
  • Focus on the accident itself: Insurers evaluate whether the accident involved a motor vehicle and whether the claimant suffered a threshold injury (e.g., soft tissue damage, whiplash, or a spinal nerve-root injury). Modifications are only relevant if they relate to the accident's cause or severity.
  • SIRA guidelines apply: The State Insurance Regulatory Authority (SIRA) provides authoritative guidance on claims, including how to demonstrate that modifications do not affect liability. Claimants should reference SIRA’s
  • Making a motor accident claim* and
  • What you can claim* pages for practical steps.

Factors Insurers Consider for Modified Vehicles

When assessing claims involving modified vehicles, insurers typically consider:

  1. Type of modification: Modifications such as hand controls, ramps, or adaptive steering are generally not relevant unless they directly contributed to the accident. For example, a faulty hand control that caused a collision would be relevant, but a standard hand control installed after an injury would not.
  1. Accident circumstances: Insurers examine whether the modification played a role in the accident. This includes reviewing police reports, witness statements, and vehicle inspection reports.
  1. Claimant’s injury: The nature of the injury (e.g., threshold injury, whole person impairment) determines eligibility for statutory benefits, not the vehicle’s modifications. SIRA’s guidelines clarify that modifications do not reduce or eliminate entitlements unless they are directly linked to the accident.
  1. Evidence of modification’s irrelevance: Claimants should provide evidence that the modification did not contribute to the accident. This may include medical records, expert opinions, or documentation of the modification’s purpose (e.g., aiding mobility after an injury).

Practical Steps for Claimants

To support a claim involving a modified vehicle, claimants should:

  • Document the modification: Provide details about the modification, including its purpose, installation date, and relevance to the accident.
  • Obtain accident reports: Police reports, witness statements, and vehicle inspection reports can help demonstrate that the modification did not contribute to the accident.
  • Consult medical records: Medical evidence should clarify the injury’s nature and how it relates to the accident, not the modification.
  • Engage with insurers early: Inform insurers of the modification and provide evidence that it does not affect liability. SIRA’s Making a motor accident claim guide offers step-by-step advice on this process.

Time Limits and Dispute Options

NSW CTP claims must be made within a specific timeframe. While there is no strict deadline for initiating a claim, delays can impact the assessment of statutory benefits. For example, weekly income payments and treatment benefits are generally limited to 52 weeks if the injury is a threshold injury. Claimants should act promptly to ensure they meet all procedural requirements.

If an insurer disputes liability, claimants may need to:

  • Request a review: SIRA provides a formal process for disputing decisions, including submitting additional evidence or expert opinions.
  • Seek independent advice: A legal professional can help navigate disputes and ensure claimants understand their rights under the MAIA.

When to Seek Legal Advice

While many claims can be resolved through SIRA’s process, complex cases involving modified vehicles may require legal assistance. A solicitor can help claimants:

  • Challenge an insurer’s refusal to pay based on irrelevant modifications.
  • Navigate disputes over liability where the modification’s role is unclear.
  • Ensure compliance with time limits and procedural rules.

Conclusion

NSW CTP insurers assess liability based on the accident’s circumstances, not the vehicle’s modifications. While modifications are generally not relevant to liability, they may impact compensation if they directly contributed to the accident. Claimants should document their modifications, provide evidence of their irrelevance, and act promptly to meet procedural deadlines. Every claim depends on its own facts. To request contact about your circumstances, complete the quick, no obligation enquiry form.

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