If you have been left with a permanent injury after a workplace accident in New South Wales, you may be entitled to a one off, tax free payment on top of your weekly payments plus your medical expenses. This is a Section 66 lump sum which is compensation for the lasting impairment your injury has caused.
Two things decide whether you qualify and how much you receive. Your whole person impairment (WPI) percentage plus the timing of when you claim. Both are easy to get wrong. Small mistakes on either can cost a worker thousands of dollars or shut a claim out entirely. This guide explains how the thresholds work, when the clock matters plus the traps to avoid.
This is general information, not legal advice about your own claim. Every matter turns on its own medical evidence, injury date plus circumstances.
What a Section 66 lump sum actually is
Section 66 of the Workers Compensation Act 1987 (NSW) gives an injured worker the right to a lump sum payment for permanent impairment caused by a work injury. Permanent impairment means your injury has stabilised and left you with a lasting loss of function. This is measured as a percentage of your whole body which is your WPI.
The most important feature to understand is that this payment is separate from your other entitlements as well as being paid on top of them. Receiving a Section 66 lump sum does not stop your weekly payments or affect your right to ongoing medical and treatment expenses. It compensates you specifically for the permanent effect of the injury on your life rather than for lost wages or treatment costs.
It is also different from a work injury damages common law claim. Section 66 does not require you to prove your employer was negligent because it is a no fault statutory entitlement. Work injury damages is the fault based claim that sits above it. It requires both negligence plus a higher impairment threshold.
The WPI thresholds: 11% and 15%
Whether you qualify for a Section 66 lump sum depends on crossing a minimum WPI threshold. The threshold differs depending on the type of injury.
For a physical injury, you generally need more than 10% WPI. In practice this means 11% or more. No permanent impairment compensation is payable for a degree of impairment of 10% or less.
For a primary psychological injury, the threshold is higher at 15% or more WPI.
These thresholds are hard gates rather than sliding scales. A worker assessed at 10% receives nothing under Section 66. A worker assessed at 11% qualifies. That single percentage point is the difference between no entitlement plus a genuine entitlement. This is exactly why the accuracy of your assessment matters so much.
A few important details sit underneath these headline numbers.
Physical plus psychological injuries cannot be combined to reach a threshold. The law assesses your primary injury type on its own. You cannot add a 9% physical impairment to an 8% psychological impairment to reach a threshold.
Multiple physical injuries from the same incident can be combined using a statutory formula to reach the 11% physical threshold. Making sure every affected body part plus every consequence of the injury is properly assessed and combined is often where the real value of a claim is found or lost.
Different rules apply to emergency service workers including police, paramedics plus firefighters. These workers are treated as exempt workers with different thresholds plus entitlements.
Higher thresholds matter too even beyond the lump sum
Most workers first encounter WPI because they want to know whether they can receive a Section 66 payment. However the percentage does much more than determine the lump sum. Crossing 21% WPI can classify you as a worker with high needs. This can affect whether weekly payments continue beyond the long term statutory limit. A WPI of 31% brings the strongest long term lifetime protections. For that reason a WPI assessment close to any of these thresholds should be treated as a serious entitlement issue rather than simply a one off payment calculation because the figure can shape your entitlements for years.
How much is a Section 66 payment worth?
The dollar amount depends on two things: your assessed WPI percentage plus the benefit table in force for your date of injury. SIRA publishes these amounts in its Workers Compensation Benefits Guide plus indexes them periodically so the figures change over time.
As a broad illustration only, lump sums step up sharply as WPI rises. An 11% assessment sits at the lower end of the scale while higher percentages climb into the tens then hundreds of thousands of dollars. The maximum permanent impairment lump sum is $757,760 as published by SIRA, indexed plus current as at early 2026. For back injuries an additional 5% may apply to that part of the impairment.
Because the right figure depends entirely on your injury date plus your correctly assessed WPI, treat any online calculator as a rough estimate only. Your actual entitlement can only be confirmed after a formal assessment.
Timing: why when you claim is critical
This is the part injured workers most often get wrong.
A Section 66 claim cannot be reliably assessed until your injury has reached maximum medical improvement (MMI). This is the point at which your condition has stabilised plus is unlikely to change substantially over the next 12 months with or without further treatment. Before MMI a WPI figure is unreliable. Assessing too early can lock in a number that understates your true permanent impairment.
For many injuries MMI is not reached until at least 12 months after the injury. It is often later if you are still undergoing surgery or active treatment. Claiming before your condition has settled risks a low assessment. Waiting an appropriate time often produces a more accurate plus frequently higher result.
There is generally no strict statutory deadline for lodging a Section 66 claim in the way there is for a work injury damages claim. However timing still matters for practical reasons. Medical records are clearer while events are recent, supporting evidence is easier to gather plus you receive your entitlement sooner. Injuries before 1 January 2002 can fall under different rules so the injury date should always be checked.
The one claim rule: the timing trap that catches people out
For claims made on or after 19 June 2012 you may generally make only one claim for permanent impairment per injury. This is the single most important reason not to rush.
If you claim early, settle at a given WPI plus your condition later deteriorates you generally cannot come back for a second bite even if your impairment is now significantly worse. A limited exception can apply where an earlier claim was made before 19 June 2012. Different, more flexible rules also apply to exempt emergency service workers.
The practical lesson is clear. Because you usually get one shot it is critical that your injury has genuinely stabilised plus the assessment captures the full permanent extent of your impairment before you claim. Settling too soon at too low a figure can be an expensive plus irreversible mistake.
What the claim process looks like
While every claim differs a Section 66 claim generally follows this path.
You wait until your injury reaches maximum medical improvement. You are then assessed by a SIRA approved permanent impairment assessor who applies the NSW workers compensation guidelines together with the relevant AMA Guides to determine your WPI percentage. Your lawyer lodges the permanent impairment claim supported by the medical evidence with the insurer.
Once the insurer receives the claim it generally has one month to either accept liability plus make a reasonable offer or dispute the claim. That timeframe can be extended if further information or a medical examination is needed. If the insurer accepts the matter can resolve through a complying agreement for which you must have obtained or knowingly waived independent legal advice. If liability or the WPI figure is disputed the matter can proceed to the Personal Injury Commission where an independent medical assessor may determine your impairment.
When the insurer’s assessment looks too low
Insurer arranged medical assessments frequently come in just under a threshold. This might be 10% instead of 11% or 14% instead of 15%. Often these disputes turn not on a dramatic disagreement but on small omissions such as a surgery history being minimised, radiculopathy being understated, chronic pain effects being left out or a psychiatric overlay being ignored.
A low assessment is not the end of the road. Underrated impairment can frequently be challenged with stronger treating specialist evidence plus where appropriate through the dispute pathway together with the Personal Injury Commission. Because the threshold gate is so unforgiving getting the medical evidence right while aligning it with the guideline language assessors actually use is usually what decides these cases.
Frequently asked questions
Will a Section 66 lump sum stop my weekly payments?
No. A permanent impairment lump sum is separate from plus paid in addition to your weekly payments and medical expenses. It does not affect those entitlements.
Do I have to prove my employer was at fault?
No. Section 66 is a no fault entitlement based on your impairment. Proving employer negligence is only required for a separate work injury damages common law claim which has a higher threshold.
How long after my injury can I claim?
Generally once your injury has reached maximum medical improvement. This is often at least 12 months after the injury plus later if you are still having surgery or active treatment. Claiming before then risks an inaccurate low assessment.
What if my injury gets worse after I claim?
For most claims made on or after 19 June 2012 you can only make one permanent impairment claim per injury. A later deterioration generally cannot be claimed again. This is why it is so important not to settle before your condition has stabilised.
Can I combine my physical plus psychological injuries to reach the threshold?
No. NSW law assesses your primary injury type on its own. Multiple physical injuries from the same event can be combined. A physical injury plus a psychological injury cannot.
Where Stephen Young Lawyers can help
Section 66 claims reward patience plus precise medical evidence. This means waiting for genuine stabilisation, making sure every affected body part is assessed plus correctly combined together with challenging an insurer assessment that lands just under a threshold. Because you usually only get one claim per injury getting it right the first time is everything.
As an Accredited Specialist personal injury firm based in Sydney CBD with a multilingual team plus a No Win, No Fee approach for eligible matters we can review your impairment, your timing plus whether your assessment reflects the true permanent impact of your injury. IRO funding may also be available to cover legal costs plus medical reports for eligible workers compensation claims.
or call +61 2 9635 0889.
This article provides general information only and is current as at June 2026. It is not legal advice and should not be relied on as a substitute for advice tailored to your own injury date, medical evidence, time limits and circumstances. Lump sum amounts are set and indexed by SIRA and depend on your date of injury. NSW workers compensation law is undergoing significant reform, and threshold rules — particularly for psychological injuries — are changing. Liability limited by a scheme approved under Professional Standards Legislation.