What is the SA WPI scale?

The South Australian WPI scale is the schedule of lump-sum compensation amounts payable for permanent impairment under the Return to Work Act 2014. WPI is assessed under AMA 5th edition (with SA modifications). Lump sums start at 5% WPI minimum threshold and scale up with severity. Reaching 30% WPI gives you 'seriously injured worker' (SIW) status, which unlocks lifetime medical, income support and additional damages.

What is the WPI threshold in SA?

5% WPI is the minimum threshold for a SA workers comp lump-sum payment. 30% WPI is the 'seriously injured worker' threshold, which provides lifetime support including medical, income, and lump-sum damages. Below 5% WPI, no lump-sum payment is made (though weekly benefits and treatment may still apply).

What is a "seriously injured worker" in SA?

Under the Return to Work Act 2014, a 'seriously injured worker' (SIW) is one with 30%+ WPI, or who satisfies the special economic loss test for terminal illness. SIW status unlocks: lifetime medical and treatment cover, ongoing income support to retirement age, lump-sum economic loss compensation, and lump-sum non-economic loss compensation. SIW status is one of the most valuable determinations in SA workers comp - it materially changes the lifetime value of a claim.

How is South Australian WPI assessed?

By an accredited Impairment Assessor under the SA scheme. The methodology is AMA Guides 5th edition with SA modifications. Each affected body region is assessed; pre-existing impairment is apportioned out; multiple impairments are combined per the Combined Values Chart. Disputes go to the South Australian Employment Tribunal (SAET) for second opinion or determination.

How much is each percent of SA WPI worth?

SA WPI lump sums use a sliding scale that increases with severity. Approximate 2024-25 amounts: 5-10% WPI ~$10,000-$30,000; 11-20% WPI ~$30,000-$110,000; 21-29% WPI ~$110,000-$220,000; 30%+ WPI ('seriously injured') typically commands $250,000+ in non-economic loss alongside lifetime support and economic loss damages.

South Australia WPI Calculator: WPI Scale SA Payouts

SA WPI calculator

South Australian WPI scheme

SA workers compensation operates under the Return to Work Act 2014 (RTW Act), administered by ReturnToWorkSA (RTWSA). The scheme uses Whole Person Impairment to determine:

Lump-sum non-economic loss compensation (NEL) above 5% WPI
Lump-sum economic loss compensation
'Seriously injured worker' (SIW) status above 30% WPI
Lifetime treatment and care cover for SIW

AMA 5th edition (with SA modifications)

SA WPI is assessed under the AMA Guides 5th edition with state modifications. The assessment is performed by an accredited Impairment Assessor who:

Confirms maximum medical improvement (MMI) is reached.
Examines each affected body region under the relevant AMA chapter.
Applies clinical and objective measures (range of motion, neurological deficit, imaging).
Apportions pre-existing impairment.
Combines multiple impairments per the Combined Values Chart.
Issues a formal report.

SA WPI thresholds

Claim type	Threshold
Non-economic loss (NEL) lump sum	5% WPI minimum
Economic loss lump sum (mid-tier)	5% - 29% WPI scale
'Seriously injured worker' (SIW) status	30% WPI
SIW: lifetime support	Automatic with SIW
Common-law negligence damages	Available where employer negligence proved (separate from RTW Act lump sums)

SA WPI lump-sum scale (2024-25 approximate)

The Return to Work Act provides separate lump-sum payments for non-economic loss (NEL) and economic loss. Approximate combined ranges:

WPI	Approx. NEL lump sum	Approx. economic loss
5-10%	$10,000 - $30,000	Limited / nil
11-15%	$30,000 - $55,000	$10,000 - $30,000
16-20%	$55,000 - $80,000	$30,000 - $50,000
21-29%	$80,000 - $200,000	$50,000 - $100,000
30%+ (SIW)	$250,000+	Lifetime income support

Always check the published current scale on the RTWSA website for exact amounts. Rates CPI-index annually.

30% WPI: "seriously injured worker" status

Reaching 30% WPI in SA triggers 'seriously injured worker' (SIW) status under the Return to Work Act. SIW status is one of the most valuable determinations in Australian workers compensation - it materially changes the lifetime value of a claim:

Lifetime medical and treatment. All reasonable medical, treatment, rehabilitation, equipment, and care - covered for life.
Income support to retirement. Weekly benefits continue beyond the standard caps applied to non-SIW workers.
Substantial NEL lump sum. $250,000+ for non-economic loss.
Care and assistance. Including paid attendant care for serious conditions.
Common-law damages. SIW status doesn't preclude separate common-law negligence claims where employer breach can be proved.

For workers whose WPI sits at 28-29%, careful preparation - thorough treating doctor reports, all body regions assessed, secondary impacts captured (e.g. depression secondary to chronic pain), and properly applied Combined Values Chart - can be the difference between non-SIW (limited support) and SIW (lifetime support).

SA common-law access

SA workers comp common-law damages run separately from the Return to Work Act statutory scheme. Common-law claims require proof of employer negligence (breach of duty of care) and follow general personal injury principles. They cover:

Past and future loss of earnings
Past and future medical and care expenses
General damages for pain and suffering (capped under the Civil Liability Act 1936)
Loss of superannuation
Out-of-pocket expenses

Unlike workers comp lump sums, common-law claims aren't gated by WPI threshold - any provable injury caused by negligence can support a claim. They run alongside Return to Work Act payments (subject to refund of certain amounts).

Free SA WPI claim assessment An SA workers comp specialist will assess your matter and identify whether you're approaching SIW (30%) status →