What Is Loss of Earnings in a Personal Injury Case?

James Wong — Founder & Pharmacist, LienScripts | April 5, 2024 | 7 min read

Loss of earnings is a recoverable economic damage in personal injury cases — the income a plaintiff lost because they could not work due to their injuries. It includes both past lost wages and future lost earning capacity, and it is quantified using employment records, tax returns, and expert economic testimony.

This post is for informational purposes only and does not constitute legal advice.

The Income the Defendant's Negligence Cost the Plaintiff

When a serious injury prevents a plaintiff from working — even temporarily — the lost income is a direct, quantifiable economic harm caused by the defendant's negligence. Loss of earnings (also called lost wages or lost income) is one of the most significant components of special damages in any PI case involving a working plaintiff.

Loss of earnings encompasses two distinct time periods:

[!KEY] Loss of earnings covers both past lost wages (verifiable from employment records) and future lost earning capacity (requiring expert projection) — and medication side effects like sedation and cognitive impairment can independently limit earning capacity beyond the physical injury alone.

Past lost earnings: Income lost from the date of the injury through the date of trial (or settlement). This is historical and can be calculated from actual employment records and pay stubs.

Future lost earning capacity: Projected income the plaintiff will lose going forward because of permanent or long-term disabilities caused by the injury. This requires expert economic testimony and may be the larger component in catastrophic injury cases.

Elements of a Lost Earnings Claim

To recover loss of earnings, the plaintiff must establish:

1. That they worked (or had earning capacity) before the injury. Employment records, tax returns, business records for self-employed plaintiffs, or evidence of job offers establish the baseline.

2. That the injury prevented or reduced their ability to work. Medical records documenting the nature of the injury, work restrictions imposed by treating physicians, and — in serious cases — vocational rehabilitation assessments establish the causal connection.

3. The amount of income lost. The calculation differs by employment type:

   • Hourly/salaried employees: hours or days missed × applicable wage rate
   • Self-employed plaintiffs: business income records, tax returns, and often forensic accountant testimony
   • Plaintiffs in cash-based occupations: more difficult to document; may require bank records and sworn testimony

4. That the lost income is causally connected to the injury. A plaintiff who was on medical leave before the accident cannot claim that income as injury-related. The timeline must show the income was lost because of this specific injury.

Future Lost Earning Capacity

In cases involving permanent disability, chronic pain, cognitive impairment from TBI, or long-term physical limitations, the most significant component of lost earnings is what the plaintiff would have earned over the remainder of their working life, discounted to present value.

Future lost earning capacity is calculated using:

Vocational expert testimony. A vocational rehabilitation specialist evaluates the plaintiff's pre-injury occupation, post-injury functional limitations, and the labor market to opine on what work the plaintiff can still perform and at what wage.

Economic expert testimony. An economist calculates the present value of the difference between what the plaintiff would have earned (pre-injury trajectory) and what they can earn post-injury, over their expected working life.

Work-life expectancy tables. Economists use actuarial tables to estimate how many years the plaintiff would have worked but for the injury.

For catastrophic injuries — spinal cord injury, severe TBI, amputation — future lost earning capacity may dwarf all other damages categories. For a related discussion of how catastrophic injury damages are projected over time, see our post on what is a life care plan.

How Medication Side Effects Connect to Lost Earnings

A less obvious but clinically significant connection exists between a plaintiff's prescription medication regimen and their lost earning capacity. Many injury medications have documented side effects that impair the ability to work:

• Opioid analgesics: Cognitive impairment, sedation, inability to operate machinery or drive
• Gabapentinoids (gabapentin, pregabalin): Sedation, cognitive effects, coordination impairment
• Muscle relaxants (cyclobenzaprine, carisoprodol): Drowsiness, impaired motor function
• Antidepressants and anxiolytics: Initial activation or sedation effects, emotional blunting

A plaintiff who cannot work a physically demanding job because of pain is partially disabled by the injury itself. A plaintiff who cannot work any sedentary job because the medications required to manage that pain cause cognitive impairment is further disabled by the treatment — which is still the defendant's fault.

The MERIT report from LienScripts documents the medications prescribed and their injury-related clinical rationale. In cases where medication side effects contribute to work limitations, this documentation helps the vocational expert and the treating physician explain the full functional impact of the injury.

Proving Lost Earnings for Self-Employed Plaintiffs

[!KEY] Self-employed plaintiffs are uniquely vulnerable to defense scrutiny on lost earnings — three years of federal tax returns combined with business bank statements and client contracts is the minimum documentation needed to defend a self-employment income claim against a well-funded defendant.

Self-employed plaintiffs present the most complex lost earnings cases because their income may not be reflected on W-2s and may fluctuate year-to-year. Key documentation includes:

• Federal and state tax returns (3+ years pre-injury)
• Business bank statements
• Client contracts and invoices
• Accounts receivable records showing lost business
• Testimony from business partners or clients about projected work
• Forensic accountant analysis

Defense counsel will scrutinize self-employed lost income claims aggressively, particularly for cash-based businesses. Thorough documentation is essential.

[!TIP] For Attorneys: When a client cannot return to work due to medication side effects — sedation from gabapentin, cognitive effects from opioids — the MERIT report documenting those medications strengthens the lost earning capacity claim through the treating physician's clinical rationale.

Lost Earnings and the Demand Letter

Lost wages belong in the special damages section of the demand letter with supporting documentation: a wage verification letter from the employer (or tax returns for self-employed plaintiffs), physician work restriction letters, and the calculated lost income figure.

For future lost earning capacity in serious cases, the demand should reference the vocational and economic expert reports (which may be prepared closer to trial) and include a projected range if exact numbers are not yet available.

Key Takeaway

[!KEY] Future lost earning capacity often exceeds all other damages in catastrophic cases — the vocational expert and economic expert should review the MERIT report alongside the medical record so the functional limitations caused by medication side effects are fully incorporated into the earning capacity projection.

Loss of earnings is one of the most significant economic damages in PI cases involving working plaintiffs. It includes both past lost wages (historical and verifiable) and future lost earning capacity (requires expert projection). For cases involving ongoing prescription medications, the functional impairment caused by medication side effects may further limit earning capacity beyond the injury itself — and documenting that connection through pharmacy records and the treating physician's records is part of a complete damages presentation.