Written by Short answer: Illinois personal injury law recognizes three separate categories of earnings-related damages: past lost wages (income you actually lost during recovery), future lost wages (the same pay from the same job, just delayed), and diminished earning capacity (a permanent reduction in what you can earn going forward — different job, fewer hours, or a lower earnings ceiling). These are distinct legal concepts, and conflating them costs injured plaintiffs real money. If your injury has permanently limited what kind of work you can do or how much of it you can perform, you may have a diminished earning capacity claim even if your current paycheck has not changed yet. Phillips Law Offices can evaluate your situation. Call (312) 346-4262 for a free consultation.
The distinction between these three damages categories matters more than most people realize, and defendants exploit the confusion constantly. I have seen juries lump all earnings losses into a single line item — and cut it dramatically because they did not understand that diminished earning capacity is a separate, forward-looking harm that requires its own evidence and its own calculation. On the other side, I have seen defense lawyers successfully argue that a plaintiff “already earns good money” so there is no earnings loss — because the plaintiff’s lawyer had not built the capacity claim separately and in advance. This guide exists to prevent that from happening to you.
Three Categories of Earnings Damages in Illinois
Illinois courts recognize all three of the following as distinct compensable damages in personal injury cases:
| Damage Type | Definition | Time Frame | Expert Needed | Key Evidence |
|---|---|---|---|---|
| Past Lost Wages | Income actually not earned during the recovery period because you could not work | Injury date to trial or settlement | Not always — pay stubs and employer letter often sufficient | Pay stubs, W-2s, employer letter confirming missed time, tax returns |
| Future Lost Wages | Same job, same income — just delayed; the gap between when you can return to work and when you actually do | Expected return-to-work date forward | Medical expert to establish return-to-work prognosis | Medical records, physician opinion on recovery timeline, employer testimony |
| Diminished Earning Capacity | Permanent reduction in what you can earn — different occupation, fewer hours, or lower earnings ceiling due to lasting injury | Permanent; calculated over work-life expectancy | Almost always — vocational expert plus economist | Vocational evaluation, functional capacity assessment, labor market data, present-value calculation |
What Diminished Earning Capacity Means Legally
Diminished earning capacity is not about what you are earning today. It is about what you could have earned over the remainder of your working life had the injury not occurred, compared to what you now can earn given your permanent limitations. Illinois Pattern Jury Instruction (IPI) Civil 30.07 instructs juries on this damage as follows: the jury should consider the difference between the plaintiff’s earning capacity before the injury and after the injury, taking into account the plaintiff’s age, health, experience, and the nature of the plaintiff’s occupation.
The critical word is “capacity.” You do not have to have already suffered a wage reduction. If your injury has permanently reduced what you are physically or cognitively capable of doing for a living, you have a capacity claim even if your employer has been accommodating you at your old salary. The question is what the market would pay you given your current functional limitations — not what your current employer happens to be paying you out of goodwill or accommodation.
A 35-year-old nurse with a permanent hand injury who can still work but can no longer perform surgical or procedural duties has a diminished earning capacity claim even if her current hospital salary has not changed. Why? Because her ceiling has dropped. She cannot advance to surgical specialties, she cannot take overtime in high-skill units, and if she loses her current position, she cannot obtain equivalent work in the same specialty. The capacity loss is real, permanent, and quantifiable — but it is invisible in her current paycheck. That is exactly the trap defendants want juries to fall into.
How to Prove Diminished Earning Capacity
Proving a diminished earning capacity claim requires building a before-and-after picture of your professional life. Here is how that typically works in an Illinois personal injury case:
- Functional capacity evaluation (FCE). A physical or occupational therapist formally tests your current physical abilities — lifting, standing, walking, fine motor skills, cognitive stamina. The FCE translates your injuries into specific work limitations that a vocational expert can then apply.
- Vocational expert evaluation. A certified vocational rehabilitation consultant reviews your FCE, your pre-injury work history, your education and credentials, and labor market data to opine on what occupations you can and cannot perform, and what those occupations pay in the current Illinois market.
- Economist’s present-value calculation. A forensic economist takes the vocational expert’s opinion on your pre-injury and post-injury earning streams, extends them over your statistical work-life expectancy (from U.S. Department of Labor tables), and discounts them to present value — the lump sum a jury can award today that, when invested, replaces the future lost earnings stream.
- Medical foundation. The treating physician or an independent medical examiner must confirm that your functional limitations are permanent and causally related to the accident. Without a solid medical foundation, the vocational and economic opinions are inadmissible.
Injuries That Most Often Support a Capacity Claim
Not every injury that is painful or inconvenient supports a diminished earning capacity claim. The claim requires permanence — a lasting functional deficit that restricts your options in the labor market. The following injury types most commonly form the basis of capacity claims in Illinois personal injury litigation:
- Traumatic brain injuries (TBI), including mild TBI with lasting cognitive effects — memory, processing speed, executive function
- Spinal cord injuries with permanent neurological deficits — weakness, numbness, or paralysis that limits physical demands
- Serious orthopedic injuries resulting in permanent range-of-motion loss or chronic pain that restricts physical work capacity
- Amputations and severe crush injuries that preclude whole categories of physical occupation
- Permanent sensory injuries — vision loss, hearing loss, loss of fine motor precision — that eliminate professional options
- Psychiatric injuries (PTSD, major depressive disorder) that are diagnosed, documented, and causally related to the accident, where the condition impairs work performance or availability
Temporary injuries — a broken arm that heals fully, a soft-tissue strain with full recovery — generally do not support a capacity claim. The key is permanence and its effect on the labor market.
How Illinois Juries Are Instructed on Earning Damages
Illinois Pattern Jury Instructions (IPI) Civil govern how juries are told to think about each category of earnings damages. Understanding the instructions helps explain why building each claim separately — with its own evidence and its own expert — is essential:
- IPI Civil 30.04 instructs on loss of income and benefits actually lost to date of trial — the past-lost-wages category.
- IPI Civil 30.05 instructs on future loss of income — the future-lost-wages category, using probability of recovery and work-life expectancy.
- IPI Civil 30.07 instructs on the impairment of the plaintiff’s capacity to earn — the diminished earning capacity category. The jury is told to consider the plaintiff’s earning ability before and after the injury, accounting for age, health, training, and occupation.
The Illinois Supreme Court has held in cases such as Byrum v. Vaughan that diminished earning capacity is recoverable even when the plaintiff has suffered no actual wage loss to date, because the damage is to the capacity itself — not to wages already lost. This is a critical point for injured professionals who have been retained at full pay by accommodating employers.
Under 735 ILCS 5/2-1116, Illinois applies a modified comparative fault rule: a plaintiff who is more than 50 percent at fault may not recover. For plaintiffs who are partially at fault, damages are reduced proportionally. This applies to all damages categories, including earning capacity claims.
Frequently Asked Questions
Can I claim both lost wages and diminished earning capacity?
Yes. They cover different periods and different types of harm, so they are not duplicative. Past lost wages covers income you actually did not earn while recovering. Diminished earning capacity covers the permanent reduction in what you can earn going forward. You can — and typically should — claim all three categories if the facts support them: past lost wages, future lost wages for the recovery gap, and then diminished capacity for the permanent impairment beyond that. Each requires separate evidence, which is why building the claim correctly from the beginning matters.
What if I have not lost any income yet but my injury will limit me later?
This is exactly the scenario where a diminished earning capacity claim is most important. If your injury is permanent and will restrict your work options going forward — even if your current employer is currently paying your full salary — you may still have a capacity claim. The law does not require an actual wage reduction to have already occurred. You need a medical foundation establishing permanence, a vocational expert explaining how your limitations affect your labor market options, and an economist calculating the present value of the difference. That claim is winnable even if you are currently earning full pay.
Do I need a vocational expert?
For diminished earning capacity claims, almost always yes. A vocational expert (typically a certified rehabilitation counselor or vocational consultant) provides the bridge between your physical limitations and the labor market. Without that expert, the jury has no reliable basis for comparing your pre-injury and post-injury earning streams, and the claim is difficult to present credibly. Defense lawyers know this and will challenge any earning capacity claim that rests on pure attorney argument rather than expert opinion.
How do juries calculate diminished earning capacity?
Juries follow IPI Civil 30.07 and consider the difference between what you could earn before the injury versus what you can earn now, projected over your remaining work-life expectancy. In practice, the jury hears the forensic economist’s present-value calculation as a guide. The economist uses your vocational expert’s opinions on pre-injury and post-injury wages, applies statistical work-life tables, and discounts the stream to a lump-sum present value. Juries can award less or more than the economist’s number, but the expert’s calculation provides the framework. Presenting this evidence clearly and credibly — not as a confusing math lecture — is one of the most important parts of how we prepare these cases.
Is diminished earning capacity taxable in Illinois?
Generally no. Under Section 104(a)(2) of the Internal Revenue Code, compensatory damages received on account of personal physical injury or physical sickness are excluded from federal gross income. Illinois conforms to this treatment for state income tax purposes. Diminished earning capacity damages received as part of a personal injury settlement or judgment for a physical injury are typically not taxable income. However, the tax treatment can become complicated in cases involving punitive damages, emotional distress claims without physical injury, or payments structured as back pay. You should consult a tax professional about your specific situation — this is not tax advice.
Authoritative Sources
- IPI Civil 30.04, 30.05, 30.07 — Illinois Pattern Jury Instructions on earnings damages (past income loss, future income loss, and impairment of earning capacity)
- 735 ILCS 5/2-1116 — Illinois modified comparative fault rule governing plaintiff’s contributory fault and damages reduction
Related Illinois Injury Guides
- Loss of Future Earnings in Illinois — How future income loss is calculated, discounted, and presented to a jury
- Pain and Suffering Damages in Illinois — The non-economic damages that accompany earning capacity claims
- Future Medical Expenses in Illinois — Proving long-term medical costs in serious injury cases
- Structured Settlements in Illinois — How long-term damages including earning capacity losses can be structured for tax-advantaged payment
If your injury has permanently limited what you can do for a living, you deserve to have that loss fully valued and presented to a jury or insurance adjuster with the expert support it requires. Phillips Law Offices handles Illinois personal injury cases on a contingency basis — no fees unless we recover. Call (312) 346-4262 today.
