Principal Assessment: the New Assessment Pathway for Workers Compensation s66 Claims

A section 66 claim is a claim for lump sum compensation for permanent impairment under the NSW workers compensation scheme. In plain terms, it is a claim about the lasting effect of the work injury on the body or mind after the injury has stabilised. It is different from weekly payments for lost income, treatment expenses, travel expenses and domestic assistance.

The claim is based on whole person impairment, usually shortened to WPI. A worker does not receive a section 66 lump sum simply because an accident was serious, painful or frightening. The legal question is whether the accepted work injury has caused a measurable permanent impairment under the applicable guidelines.

Physical injury and psychological injury have different rules and thresholds. Primary psychological injury should not be confused with secondary psychological symptoms. For example, depression caused directly by bullying or traumatic work events is different from mood symptoms that develop because of a physical injury and pain. That distinction can matter for permanent impairment compensation and for the 2026 reform thresholds.

WPI can also affect more than the lump sum itself. Depending on the claim, WPI may affect weekly payments after key statutory points, treatment duration, whether a worker can bring a work injury damages claim, commutation strategy and whether the worker is treated as having high or highest needs.

Key takeaway: section 66 is about permanent impairment, not just injury severity. The assessment pathway should be planned before the worker signs any agreement.

Whole person impairment is a percentage assessment of permanent impairment. It is meant to express the lasting medical impairment caused by the work injury as a percentage of the whole person. It is not a score for pain, distress, inconvenience, lost wages or the seriousness of the accident.

WPI is assessed under the applicable NSW workers compensation permanent impairment guidelines, using AMA 5 as modified by NSW rules for many injuries. The assessor considers the worker as they present on the day of assessment, the medical history, investigations, treatment, function and the specific method required for the body system.

Maximum medical improvement is usually central. If symptoms are severe but still changing, if surgery is pending, if injections or rehabilitation may materially improve function, or if the diagnosis is not settled, the impairment may not yet be permanent or fully ascertainable. An early assessment can create avoidable problems.

Different body systems may need different specialists. A spinal injury, shoulder injury, hand injury, hearing loss claim, scarring claim and psychological injury are not all assessed in the same way. Where more than one body system is involved, the assessment plan must identify who assesses each system and how the final WPI is calculated.

• WPI is not the same as capacity for work.
• WPI is not the same as a diagnosis such as disc bulge, PTSD or rotator cuff tear.
• WPI is not automatically higher because the accident was dramatic.
• WPI can be reduced for previous injury or pre-existing condition where the law permits a deduction.

A principal assessment is the main statutory assessment of the degree of permanent impairment of an injured worker for the relevant injuries. SIRA reform material describes it as the new pathway for permanent impairment assessments, intended to move the system away from the old pattern where each side might collect competing WPI reports before arguing about the result.

The assessment is made by assessor or assessors on the SIRA register for the relevant body systems. If multiple body systems require assessment by different specialists, the 2026 Guidelines for independent medical examinations and permanent impairment assessments explain that one specialist may need to be nominated as lead assessor to determine the final WPI.

A principal assessment can affect section 66 lump sum compensation, but its practical effect can be broader because WPI may influence other entitlements. That is why the worker should not treat it as a routine appointment or a box-ticking exercise.

The exact procedure should be checked against the commenced legislation, the Workers Compensation Regulation 2016 as amended, the Workers Compensation Guidelines 2026 and current SIRA guidance at the time the assessment is arranged. If the worker and insurer cannot agree on the assessor or scope, SIRA involvement may be relevant, subject to the final rules then in force.

A principal assessment is not an ordinary employer or insurer IME. It is the main impairment assessment pathway and should be approached with proper legal and medical preparation.

Under the traditional pathway, workers and insurers often approached WPI by obtaining their own medico-legal evidence. A worker might serve a section 66 claim with a WPI report. The insurer might accept, negotiate, dispute the claim or obtain its own evidence. Some matters resolved by a complying agreement. Others went to the Personal Injury Commission for medical or legal dispute steps.

The principal assessment model is intended to focus the process on one main statutory assessment rather than a battle of reports. That does not mean every disagreement disappears. There can still be disputes about injury description, body systems, deductions, causation, thresholds, legal entitlement, agreements and whether a further assessment is available.

The safest way to think about principal assessment is as a sequence. The worker should not jump from “I have pain” to “book the assessment” without checking the accepted injuries, medical stability, body systems and consequences of the result.

Practical flow: Injury stabilises → documents prepared → legal advice → principal assessment → certificate → agreement or dispute. Each step affects the next one.

Principal assessment looks medical, but the consequences are legal. The percentage assessed can affect whether a worker receives a section 66 lump sum, whether weekly payments continue after statutory thresholds, how long treatment expenses remain available, whether the worker can pursue work injury damages, and whether commutation is even worth considering.

There may also be external consequences. A lump sum or settlement step may interact with Centrelink, tax, superannuation, private insurance, total and permanent disability insurance, child support or other financial arrangements. Those issues are not all workers compensation issues, but a worker should know when to obtain separate advice.

Legal advice is also important because an impairment dispute can involve both medical and legal questions. A doctor may assess the percentage, but a legal dispute may decide whether the injury is accepted, whether a consequential condition is included, whether a deduction is lawful, whether the claim is out of time or whether an agreement should be signed.

• Get advice before agreeing to the scope of injuries and body systems.
• Get advice before signing any permanent impairment agreement.
• Get advice if the insurer says the assessment is final and cannot be challenged.
• Get advice if psychological injury, prior injury or work injury damages strategy is involved.

The quality of the assessment depends heavily on the documents. A worker should not assume the insurer, doctor or assessor has everything. Missing operative notes, imaging, accepted-injury letters or prior reports can change the assessment picture.

The aim is not to flood the assessor with irrelevant material. The aim is to make sure the assessor has a clear injury chronology, accepted injury description, treatment history, investigations, current symptoms and any relevant prior injury records.

• Claim number, insurer details and employer details.
• Injury notification, claim form and insurer acceptance or dispute notices.
• Section 78 notices, work capacity decisions and any PIC or IRO material.
• Certificates of capacity and treating GP records.
• Specialist reports, operative reports, imaging reports and actual images where requested.
• Rehabilitation, physiotherapy, psychology and medication records.
• Prior injury and pre-existing condition records where relevant.
• Employment duties, job description, incident reports and witness material where causation or body part involvement is disputed.
• Psychological reports and PIRS-related material where relevant.
• Hearing loss audiograms and previous WPI assessments where relevant.

A permanent impairment assessment should usually wait until the impairment is permanent and fully ascertainable. SIRA public material on permanent impairment explains maximum medical improvement as a point where the condition has stabilised and is unlikely to change substantially in the next year with or without treatment.

Serious symptoms are not the same as stable impairment. A worker may be in severe pain but still awaiting surgery. A psychological injury may still be in active treatment. A shoulder injury may improve after repair and rehabilitation. A spinal condition may worsen or improve after injections, surgery or time. Timing matters.

A premature assessment can cause practical problems. It may understate impairment, leave body systems unresolved, cause arguments about whether the assessor could assess at all, or create a certificate that does not reflect the final condition. If the assessor considers the impairment is not permanent or fully ascertainable, they may be unable to provide a final assessment.

Do not confuse “I am badly injured now” with “my permanent impairment can safely be assessed now”. The second question is more technical.

Before a principal assessment, the body systems and injuries to be assessed must be identified carefully. Common examples include lumbar spine, cervical spine, shoulder, elbow, wrist, hand, hip, knee, ankle, foot, hearing loss, scarring, neurological injury and psychological injury.

Missed body parts can affect the final WPI. A worker who injured a back and developed radiculopathy, or injured a shoulder and later developed neck symptoms, should not assume every consequential condition will be included automatically. Accepted injuries, disputed consequential conditions and old injuries need careful handling.

Physical and psychological impairment should not be incorrectly combined if the law requires separate treatment. Primary psychological injury, secondary psychological injury and psychiatric consequences of physical injury may have different compensation consequences. This is a common area where workers need advice before the assessment scope is locked in.

The assessor will usually review documents, take a history, ask about the injury, treatment, symptoms and function, and perform a clinical examination where appropriate. The assessor then applies the relevant permanent impairment guidelines to reach a percentage WPI assessment.

The assessor may consider whether part of the impairment is due to previous injury or pre-existing condition. Deductions can be contentious. A worker should be honest about previous problems, but should also make sure the assessor has accurate records showing what was and was not symptomatic before the work injury.

The worker should answer questions accurately and consistently. Do not exaggerate. Do not minimise. Explain what happens on good days and bad days, what activities trigger symptoms, what treatment has helped or failed, and how the injury affects practical function.

• Before attending: re-read your injury history and key treatment dates.
• Bring imaging or reports if requested by the assessor.
• Be accurate about previous injuries, surgery and symptoms.
• Explain functional restriction clearly, including lifting, sitting, standing, walking, sleep, concentration and personal care where relevant.
• Tell the assessor if the history being put to you is wrong or incomplete.
• Ask how and when the certificate or report will be provided.

After the assessment, a principal assessment certificate should identify the assessed WPI, the injuries or body systems assessed, the facts and documents relied on, the reasons for the assessment, and any deduction for previous injury or pre-existing condition. The exact form and terminology should be checked against the current rules when the certificate is issued.

The worker should not look only at the final percentage. Check whether the correct injury date, accepted injuries, consequential conditions, body systems, investigations and treatment history were considered. A certificate that reaches a percentage after considering the wrong injury set may create a major dispute.

The practical effect of the certificate depends on the percentage and the claim context. It may support a section 66 lump sum, affect whether thresholds are met, or lead to an agreement or dispute. A low certificate does not automatically mean there is no possible dispute, but the worker needs targeted advice about what issue can actually be challenged.

Read the reasons, not just the number. The reason a percentage was reached often tells you whether the next issue is medical evidence, legal scope or both.

After principal assessment, the worker and insurer may agree on the degree of permanent impairment and the section 66 outcome. Historically, agreements about section 66 have used compliance concepts such as section 66A. Under the new pathway, workers should check the current wording and process before signing any permanent impairment agreement.

An agreement is different from a dispute. Signing may resolve the impairment claim on the agreed basis. That can be sensible in the right case, but only after the worker understands the percentage, injuries covered, amount payable, interaction with other entitlements and whether anything has been left out.

Do not sign because an insurer says it is routine. Do not sign because the amount looks helpful in the short term. Do not sign if the certificate appears to miss a body system, applies an unexplained deduction, excludes a disputed consequential injury, or treats psychological injury incorrectly.

• Check the injuries and body systems covered by the agreement.
• Check whether weekly payments, treatment, work injury damages or other entitlements may be affected.
• Check whether legal advice is required or strongly recommended before signing.
• Keep a full copy of the certificate, agreement and insurer calculation.

Disagreement can arise for several reasons. The worker or insurer may disagree with the assessed WPI, the body system chosen, a deduction for pre-existing condition, whether an injury should have been included, whether the worker had reached maximum medical improvement, or whether a legal threshold has been met.

Some disputes are medical. Others are legal or liability disputes. For example, whether a shoulder has a certain percentage impairment may be medical. Whether the shoulder injury is accepted as part of the claim may be legal or factual. Whether a psychological injury is primary, secondary, relevant injury or excluded may involve mixed legal and medical issues.

Depending on the issue, the matter may proceed through the Personal Injury Commission or another statutory pathway. IRO and ILARS funding may be relevant for legal advice and representation in eligible workers compensation disputes. Workers should get advice early because time limits and procedural steps can matter.

Further principal assessment should be approached cautiously. It is not automatic just because symptoms worsen, a worker dislikes the first result or the worker later obtains a different doctor’s view. SIRA reform FAQs indicate further assessment is limited to unexpected and material deterioration, where there were no reasonable grounds at the time of the initial assessment to expect that deterioration.

SIRA has also indicated the deterioration generally needs to result in at least a further 10 percentage point increase in permanent impairment. Ordinary age-related deterioration should not be treated as enough. Final regulation wording and any current SIRA guidance should be checked before advising that a further assessment is available.

Examples help, but they are not rules. A worker who unexpectedly needs major surgery after a condition was genuinely thought stable may be in a different position from a worker whose pain fluctuates within the expected course. A worker with age-related spinal degeneration worsening over time may face a different argument from a worker with a new, unexpected work-injury complication.

Do not assume there is a second chance. If the first assessment may become the main assessment, prepare it properly.

Psychological injury needs separate care. Primary psychological injury means a psychiatric or psychological injury that is not merely a consequence of a physical injury. Secondary psychological symptoms can arise because a worker is living with pain, disability or loss after a physical injury. The distinction matters because secondary psychological injury may be excluded from permanent impairment compensation in some contexts.

The 2026 reforms also changed the legal environment for some psychological injury claims and thresholds. Workers should not rely on outdated 31% summaries unless the article is clearly discussing historic material. Relevant injuries involving bullying, sexual harassment, racial harassment or excessive work demands may follow a different pathway for some issues.

SIRA has indicated that PIRS is under review. Until final guidance and rules are settled, psychological WPI advice should be cautious and tied to current official sources. Workers with psychological injury should read the dedicated psychological injury reform guide and obtain advice before assessment scope or agreement.

• Do not mix up primary and secondary psychological injury.
• Do not assume psychological and physical WPI are combined in the same way as physical body systems.
• Do not rely on old threshold commentary without checking current law.
• Check whether the claim involves relevant event or relevant conduct concepts under the 2026 reforms.

Transitional rules may decide whether the new principal assessment pathway applies, how it applies, or what happens to older evidence. The answer may depend on date of injury, date of notification, date of claim, whether a WPI report already exists, whether a PIC medical assessment has already occurred, whether a section 66 dispute is pending and whether a previous agreement exists.

Exempt workers may have different rules. Coal miners are often dealt with under separate arrangements. Psychological injury reforms also have their own timing issues. Because transition provisions can be technical, workers should not assume a general article answers their individual case.

The safe approach is to check the commenced legislation, the amended 2016 Regulation, the Workers Compensation Guidelines 2026, SIRA FAQs and any PIC or IRO guidance current at the date the assessment or dispute step is taken.

Most principal assessment problems are avoidable. They usually start before the assessment, when the wrong scope is accepted, the injury is assessed too early, documents are missing, or the worker signs without understanding the consequences.

• Thinking “principal assessment” means the employer’s principal or a principal contractor assesses the claim. It does not.
• Treating principal assessment like an ordinary insurer IME.
• Going to assessment before maximum medical improvement or before impairment is fully ascertainable.
• Failing to include all accepted injuries, consequential conditions or body systems.
• Ignoring prior injuries and pre-existing conditions until the assessor raises a deduction.
• Signing a permanent impairment agreement too quickly.
• Assuming one low assessment can never be challenged, without checking the actual legal issue.
• Confusing section 66 lump sum compensation with work injury damages.
• Confusing physical and psychological thresholds.
• Using old reform articles, draft rules or insurer summaries without checking final commenced law.