Permanent partial disability benefits compensate an Illinois employee who has sustained a lasting work-related impairment but is not permanently unable to perform all employment.
A PPD calculation generally depends on the employee’s average weekly wage, the applicable weekly PPD rate, the body part or type of disability involved, and the percentage of permanent loss established through medical and occupational evidence.
The basic formula for many claims is:
PPD Rate × Compensable Weeks × Percentage Of Permanent Disability = PPD Benefit
Although the arithmetic may appear simple, determining the correct disability percentage and compensable number of weeks can be heavily disputed. A doctor’s impairment rating does not automatically control the result, and a diagnosis alone does not establish a particular settlement amount.
Permanent partial disability, commonly abbreviated as PPD, refers to a permanent loss or partial loss of a body part, a permanent loss of use, or a partial loss of use of the body as a whole.
The IWCC explains that “loss of use” generally means the employee can no longer perform activities that the worker could perform before the injury. A PPD determination ordinarily cannot be made until the worker reaches maximum medical improvement and the condition has produced some permanent physical loss.
Maximum medical improvement, commonly called MMI, does not mean the employee has healed completely. It generally means the condition has stabilized and substantial additional improvement is not expected through further treatment.
A worker may reach MMI while continuing to experience pain, weakness, reduced motion, work restrictions, medication needs, or other permanent limitations.
Scheduled injuries, person-as-a-whole injuries, and qualifying disfigurement awards are generally calculated using 60 percent of the employee’s average weekly wage. Statutory minimum and maximum rates apply.
The preliminary formula is:
Average Weekly Wage × 60 Percent = Weekly PPD Rate
Assume an employee’s average weekly wage is $1,000.
$1,000 × 60 percent = $600 weekly PPD rate
The $600 figure can be used only when it falls within the minimum and maximum rates applicable to the accident date.
Illinois PPD rate limits change over time. The correct rate must be verified using the accident date and the IWCC benefit-rate schedule rather than an outdated figure found on an older webpage.
Average weekly wage, or AWW, forms the basis of the PPD rate. An understated AWW can reduce the permanent disability award as well as temporary disability benefits paid during treatment.
Illinois generally calculates AWW from includable gross earnings during the relevant period before the accident. Different methods apply when the employee worked less than 52 weeks, missed qualifying periods, held known concurrent employment, or had employment too short or irregular for the ordinary calculation.
AWW disputes may involve mandatory additional hours, voluntary overtime, commissions, tips, seasonal layoffs, concurrent jobs, and incomplete payroll records.
Read How To Calculate Average Weekly Wage In Illinois for the complete wage analysis.
Illinois recognizes four principal forms of PPD:
The employee does not automatically select whichever method produces the highest number. The medical condition, affected body part, return-to-work status, earning capacity, and statutory restrictions determine which benefit theory may apply.
Section 8(e) assigns a specific number of weeks to listed body parts. A complete loss or complete loss of use can qualify for the full number of weeks. A partial loss is calculated as a percentage of that schedule.
For injuries occurring on or after February 1, 2006, examples of scheduled values include:
The formula is:
Weekly PPD Rate × Statutory Weeks × Percentage Loss Of Use
Assume an employee has:
The arm schedule provides 253 weeks.
253 weeks × 20 percent = 50.6 compensable weeks
50.6 weeks × $600 = $30,360
The resulting scheduled PPD value would be $30,360 before attorney fees, costs, statutory credits, or other settlement adjustments.
This example does not establish that a particular arm injury equals a 20 percent loss. The percentage must be negotiated or determined from the evidence.
Each finger and the hand have separate statutory schedules. The level of amputation or partial loss can affect the calculation.
Loss of the first or distal phalanx of a thumb, finger, or toe is generally treated as one-half the loss of that digit. Loss of more than one phalanx is generally treated as loss of the entire digit. Compensation for multiple fingers is also subject to the statutory hand limitation.
The facts must determine whether the condition should be calculated as a finger injury, multiple-digit injury, or partial loss of use of the hand.
Illinois imposes special limits on PPD for carpal tunnel syndrome caused by repetitive or cumulative trauma in accidents occurring on or after June 28, 2011.
The applicable hand schedule is 190 weeks rather than 205 weeks. PPD ordinarily cannot exceed 15 percent loss of use of the hand. A higher award requires clear and convincing evidence and cannot exceed 30 percent loss of use of the hand.
This limitation applies specifically to qualifying repetitive or cumulative carpal tunnel injuries and should not automatically be extended to every hand or wrist condition.
An injury that is not evaluated under the scheduled-member provisions may be calculated as a percentage loss of the person as a whole.
Illinois uses 500 weeks as the maximum person-as-a-whole value. This method is commonly relevant to back, neck, torso, and other nonscheduled injuries.
The formula is:
Weekly PPD Rate × 500 Weeks × Percentage Loss Of The Person As A Whole
Assume an employee has:
500 weeks × 15 percent = 75 compensable weeks
75 weeks × $600 = $45,000
The resulting PPD value would be $45,000 before fees, costs, credits, or negotiated adjustments.
The classification of an injury should not be based solely on the employee’s description of the body part. Shoulder, hip, nerve, and multi-body-part injuries can present classification questions that require review of Section 8 and Illinois decisions.
Illinois establishes minimum compensation periods for several specified injuries evaluated under the person-as-a-whole provisions.
The statute provides minimums of six weeks for a fractured skull, six weeks for each fractured vertebra, two weeks for each listed facial bone fracture, and three weeks for each fractured transverse process. Loss of a kidney, spleen, or lung carries a minimum of 10 weeks for each organ.
These are statutory minimum periods, not automatic complete valuations of every resulting impairment. More substantial disability may support a greater award when the evidence establishes additional permanent loss.
An employee may receive compensation for serious and permanent disfigurement involving specified areas, including the hand, head, face, neck, arm, leg below the knee, and chest above the armpits.
For applicable current injuries, disfigurement is limited to a maximum of 162 weeks at the PPD rate. The scar or altered appearance generally must heal for at least six months before it can be assessed at a hearing.
The amount depends on characteristics such as location, size, visibility, color, texture, and permanence.
An employee generally cannot recover both disfigurement and loss-of-use compensation for the same physical condition. The competing methods should be evaluated before the claim is resolved.
A wage differential may apply when a permanent work injury prevents the employee from returning to the usual occupation and the employee earns or is capable of earning less in suitable employment.
The weekly benefit is generally:
Current Earnings In Former Occupation − Post-Injury Earnings Or Earning Capacity × 66⅔ Percent
Assume the worker would currently earn $1,200 per week in the former occupation but can earn only $750 after the injury.
$1,200 − $750 = $450 wage loss
$450 × 66⅔ percent = $300 weekly wage-differential benefit
For injuries occurring on or after September 1, 2011, the benefit generally continues until age 67 or five years after the award becomes final, whichever is later. An employee generally cannot receive both a wage differential and another PPD award for the same disability.
Wage-differential calculations may require medical restrictions, job descriptions, vocational evidence, labor-market research, actual post-injury wages, and proof of what the former occupation currently pays.
For injuries occurring on or after September 1, 2011, Illinois requires the Commission to evaluate five factors:
No single factor is the sole determinant of PPD.
The PPD percentage is therefore not established by applying a doctor’s number mechanically. The Commission must consider how the permanent condition affects this particular employee.
No. An AMA impairment rating is only one statutory factor and is not automatically the primary or controlling factor.
Illinois appellate courts have held that the Commission must weigh all five factors and that the statute does not require the impairment report to receive greater weight than the employee’s occupation, age, future earning capacity, or documented disability.
A doctor may assign a relatively low impairment rating while the employee experiences meaningful permanent restrictions in a physically demanding occupation. Conversely, a medical diagnosis and impairment rating may have a more limited employment effect when the employee has recovered well and returned without restrictions.
Illinois courts have also held that an employee is not automatically barred from receiving PPD merely because neither party submitted a formal AMA impairment report. When a compliant report is submitted, the Commission must consider it with the remaining factors.
The same physical injury can affect workers differently.
A permanent hand limitation may have a greater occupational effect on a mechanic, electrician, carpenter, machinist, nurse, or warehouse employee than on a worker whose duties require less gripping or manual dexterity.
A back restriction may prevent a laborer from lifting, bending, climbing, or operating equipment while allowing another employee to resume less physically demanding work.
The analysis should therefore document the actual duties rather than relying on a generic job title.
Age may influence how a permanent impairment affects retraining, job options, career duration, and recovery.
Future earning capacity concerns whether the condition reduces the employee’s ability to earn income over time. Relevant evidence may include permanent restrictions, loss of overtime opportunities, inability to return to a skilled trade, reduced advancement prospects, and available alternative employment.
A worker can have permanent disability even after returning at the same wage. The absence of an immediate wage reduction does not automatically eliminate scheduled or person-as-a-whole PPD.
Treating records can corroborate lasting pain, weakness, loss of motion, numbness, reduced endurance, surgery, work restrictions, and difficulty performing ordinary activities.
Relevant records may include operative reports, therapy measurements, diagnostic testing, specialist evaluations, functional-capacity testing, final work restrictions, and maximum-medical-improvement opinions.
A conclusory impairment percentage unsupported by the treatment history may receive less persuasive weight than consistent records documenting the nature and extent of the disability.
No. Surgery can be significant evidence, but Illinois does not assign an automatic PPD percentage to a rotator cuff repair, spinal fusion, meniscus surgery, fracture fixation, or carpal tunnel release.
The outcome matters. The evidence should show whether the employee regained strength and motion, returned to the former job, remained under restrictions, required additional care, or experienced permanent complications.
Two workers undergoing the same procedure can receive different PPD evaluations because their wages, occupations, ages, recovery, restrictions, and earning consequences differ.
Illinois workers’ compensation does not provide a separate personal injury award for past or future pain and suffering.
Residual pain may be considered as part of the evidence of permanent disability, but it is not calculated through a separate pain-and-suffering multiplier.
A third-party personal injury claim may provide pain-and-suffering damages when someone other than the employer caused the workplace accident.
An award is issued after an IWCC hearing or review. A settlement is a negotiated agreement approved by the Commission.
A settlement may use the PPD formula as a starting point while also resolving disputed medical bills, unpaid temporary benefits, future care, causation defenses, and litigation risks.
The negotiated amount can therefore differ from the basic formula. The employee should also distinguish the gross settlement from the amount remaining after attorney fees, expenses, and other identified deductions.
Read How Illinois Workers’ Compensation Settlements Are Calculated for the broader settlement analysis.
For a scheduled injury:
PPD Rate × Scheduled Weeks × Percentage Loss Of Use
For a person-as-a-whole injury:
PPD Rate × 500 Weeks × Percentage Loss Of The Whole Person
Scheduled, person-as-a-whole, and disfigurement PPD benefits are generally calculated at 60 percent of AWW, subject to statutory minimums and maximums.
No. A doctor may provide medical findings or an impairment report, but the parties negotiate the settlement percentage or the IWCC determines the percentage after considering all statutory factors.
Not necessarily. Illinois appellate courts have held that a PPD award is not automatically barred when neither party submits a formal impairment report. A report that is submitted must be considered with the other factors.
No. Medical impairment and legal disability are related but distinct concepts. The Commission must consider the other four statutory factors and cannot treat one factor as controlling.
Potentially. Returning to work does not automatically mean that no permanent loss exists. The evidence may still show pain, weakness, reduced movement, or other lasting impairment.
Yes. Permanent restrictions may support PPD and may also create a wage-differential or vocational claim if they prevent return to the former occupation.
Back and many other nonscheduled injuries are commonly evaluated as a percentage loss of the person as a whole using 500 weeks.
The ordinary hand schedule is 205 weeks for applicable injuries. Repetitive carpal tunnel syndrome occurring on or after June 28, 2011 is subject to a special 190-week schedule and percentage limits.
An employee generally cannot receive both forms of permanent compensation for the same disability. The evidence and long-term financial consequences of each method should be compared.
No. PPD compensates permanent disability. Future medical treatment is a separate benefit that may remain open under an award or be addressed and closed through a settlement.
There is no dependable average. Value depends on AWW, the applicable PPD rate, injury classification, statutory weeks, disability percentage, occupation, age, future earning capacity, medical records, restrictions, and disputed issues.
Workers’ compensation benefits are generally not treated as taxable income under federal or Illinois law.
Permanent partial disability calculations can involve an incorrect average weekly wage, the wrong statutory schedule, an understated loss-of-use percentage, an employer-selected impairment report, permanent restrictions, wage loss, or uncertainty about future medical care.
Robert Edens Law Office represents injured employees throughout Antioch, Waukegan, Grayslake, Lake Zurich, Woodstock, Barrington, Lake County, McHenry County, and surrounding Northern Illinois communities.
Call (847) 395-2200 or contact Robert Edens Law Office to request a consultation about an Illinois permanent partial disability award or settlement.
For a broader explanation of TTD, PPD, wage differentials, medical benefits, and claim value, read Illinois Workers’ Compensation Benefits And Claim Value.
This page provides general legal information and does not guarantee a disability percentage, weekly rate, settlement amount, or case result. Each PPD calculation depends on the employee’s accident date, wages, injury classification, medical evidence, occupational effects, and applicable Illinois law.
The Law Offices of Robert T. Edens, Personal Injury and Workers' Compensation Law Office, have offices in Antioch, Waukegan, Grayslake, Woodstock and Barrington. We represent clients throughout the communities of Antioch, Waukegan, Grayslake, Barrington, Woodstock, Buffalo Grove, Deer Park, Gurnee, Lake Zurich, Round Lake, McHenry, Cary, Crystal Lake, Libertyville, Lincolnshire, Mundelein, Vernon Hills, Wheeling, North Chicago, Zion, Inverness, Palatine, Wauconda, Island Lake, Fox Lake, Barrington Hills, Spring Grove, Lake Bluff, Lakemoor, Long Grove, Lake Villa, Kildeer, Wadsworth, Indian Creek, Fox River Grove, Lindenhurst and other cities within Lake and McHenry Counties Illinois.
© 2026 The Law Offices of Robert T. Edens, LLC., All Rights Reserved, Reproduced with Permission Privacy Policy | Sitemap | Disclaimer
Powered By 
