Not every work injury results in total disability. Many construction workers who are injured on the job are eventually able to return to work — but not to the same job, or not at the same pay. When a permanent impairment limits you to lower-paying work, Illinois workers’ compensation law provides a specific benefit called a wage differential. Understanding how wage differential workers comp in Illinois works can make a significant difference in the long-term value of your claim.
This article provides general legal information; consult a licensed Illinois attorney for advice specific to your situation.
What Is a Wage Differential Benefit?
A wage differential benefit is a form of permanent partial disability (PPD) benefit available when an injured worker can return to some form of employment, but earns less than they did before the injury. Under 820 ILCS 305/8(d)(1), the benefit is calculated as two-thirds of the difference between the worker’s pre-injury average weekly wage (AWW) and their post-injury earning capacity. The benefit is paid weekly and continues until the worker reaches age 67 or for five years, whichever period is longer.
This benefit is sometimes called an “8(d)(1)” benefit, after the statutory subsection that creates it. It is distinct from temporary total disability (TTD), which is paid while you are completely off work during recovery, and from the lump-sum permanent partial disability benefits available under other subsections of the statute.
How the Benefit Is Calculated — A Hypothetical Example
To illustrate how 820 ILCS 305/8(d)(1) works in practice, consider a hypothetical scenario. Assume a construction worker earned an average of ,400 per week before a back injury. After reaching maximum medical improvement, the worker can only perform light-duty clerical work paying per week. The wage differential would be calculated as follows:
- Pre-injury AWW: ,400
- Post-injury earning capacity:
- Difference:
- Benefit (two-thirds of ): approximately .67 per week
This is a hypothetical example for illustration only. Actual benefit amounts depend on the specific facts of each case, including how AWW is calculated and what the IWCC determines to be the worker’s actual post-injury earning capacity. Do not rely on any specific dollar figure as a projection of what your claim is worth.
The 8(d)(1) vs. 8(d)(2) Election — A Critical Choice
When a worker qualifies for permanent partial disability, they may face an election between two types of benefits. Under 820 ILCS 305/8(d)(1), the worker receives the ongoing wage differential benefit described above — weekly payments tied to the income gap, continuing until age 67 or five years, whichever is longer. Under 820 ILCS 305/8(d)(2), the worker receives a “person as a whole” award, which is a lump-sum or structured payment calculated based on the percentage of permanent impairment to the body as a whole, expressed in weeks of compensation.
These are not stacked benefits — they are alternative elections. Choosing one means forgoing the other. The right choice depends heavily on individual circumstances: the severity of the permanent impairment, the worker’s age, their pre-injury wage, their realistic post-injury earning capacity, and whether they intend to return to work in any capacity. An 8(d)(1) wage differential can be more valuable over time for a younger worker with a significant wage loss, while an 8(d)(2) person-as-a-whole award may be preferable in other situations.
This election is one of the most consequential decisions in a workers’ compensation case. Consulting with an attorney before making it is strongly recommended. Experienced attorneys handling Illinois construction workers’ compensation claims regularly help clients evaluate both options against the specific facts of their situation.
How Post-Injury Earning Capacity Is Determined
The IWCC does not simply take the worker’s word for their post-injury earning capacity, nor does it automatically accept the insurer’s position. Earning capacity is a legal determination that considers the worker’s actual earnings in any new job, but also the jobs the worker is capable of performing given their restrictions, their education, their prior work experience, and the local labor market. If a worker is not yet working in a new position, the IWCC may consider what jobs are realistically available to someone with their limitations.
Insurers sometimes argue that a worker has a higher earning capacity than their actual post-injury job reflects — for example, by pointing to positions the worker could theoretically perform but has not been offered. Challenging that position typically requires vocational evidence and sometimes expert testimony. This is an area where legal representation makes a meaningful practical difference.
Duration of the Benefit and Future Adjustments
Under 820 ILCS 305/8(d)(1), the wage differential benefit continues until the worker reaches age 67 or for five years from the date of the award, whichever period is longer. For a worker in their 30s or 40s, this can represent decades of ongoing payments. The benefit amount is fixed at the time of the award based on the difference between the pre-injury AWW and the post-injury earning capacity determined at that time — it does not automatically adjust if the worker later earns more or less.
If a worker’s post-injury earning capacity later increases — for example, because they retrain and obtain a better-paying position — the benefit may be subject to modification. Understanding the long-term structure of these payments and how future employment changes interact with the benefit is another reason why attorney guidance at the time of the award matters.
Talk to a Chicago Attorney — Free Consultation
If you or a family member has been harmed, the attorneys at Phillips Law Offices are ready to help. Call (312) 346-4262 or contact us online for a free, no-obligation consultation.