How Is Loss of Earning Capacity Calculated?

What "Loss of Earning Capacity" Actually Measures

A deposition question that sinks more vocational opinions than any other: "Walk me through exactly how you got that number." If the answer is a shrug and a spreadsheet nobody can reconstruct, the number is gone — and so is the credibility of everything else in the report. The practitioners who survive that question aren't the ones with the fanciest software. They're the ones who can name every input, cite where it came from, and show the arithmetic in order.

Loss of earning capacity (LEC) is a forward-looking estimate of the capacity to earn that a person lost, not a tally of wages already missed. That distinction matters: past wage loss is backward-looking and largely arithmetic (what would this person have earned between injury and today); loss of earning capacity looks ahead, comparing what someone was capable of earning before an injury, illness, or disabling event against what they remain capable of earning after it, projected across the years of work they had left.

This is an estimating and organizing framework, not a black box. By the end of this piece you'll be able to name every component that goes into a loss-of-earning-capacity calculation, where the data for each one comes from, and where the vocational counselor's role ends and the economist's or physician's begins.

The Components Behind How Loss of Earning Capacity Is Calculated

Strip away the jargon and a loss-of-earning-capacity analysis rests on four building blocks:

1. Pre-injury earning capacity — what the person was capable of earning before the injury or onset of disability, not necessarily what they were earning at the moment of injury.
2. Post-injury earning capacity — what the person remains capable of earning now, given medical restrictions, transferable skills, and the occupations realistically open to them.
3. The annual (or hourly) differential — the gap between the two figures.
4. A time horizon — typically derived from work-life expectancy — over which that differential is projected forward.

A fifth step, converting a stream of future annual losses into a single present-value figure, is common in litigation but is generally an economist's function, not a vocational counselor's. The vocational counselor's product is the earning-capacity comparison and the documented reasoning behind it; the discount rate and present-value math belong to a different credential. Conflating the two roles is one of the more common — and more easily challenged — errors in an LEC opinion. For a fuller breakdown of the wage-earning-capacity concept itself, see wage-earning-capacity, explained.

Establishing Pre-Injury Earning Capacity

Pre-injury earning capacity is not simply "the last paycheck." A person's capacity to earn reflects their occupational classification, education, training, licensure, certifications, and — where the record supports it — a documented trajectory of raises or promotions that would plausibly have continued. A worker one semester from a credential that would have moved them into a higher-paying occupational classification has a different pre-injury capacity than their pay stub alone would suggest.

Sourcing for this component typically includes:

• Tax records, pay stubs, and employer wage verification for actual historical earnings.
• The worker's job title mapped to a recognized occupational classification, so the analysis is anchored to a defined occupation rather than an informal label.
• Any documented pattern of advancement, overtime, or bonus structure that was part of the pre-injury earning picture.

Where the record is thin — self-employment, gig work, a recent graduate with no wage history — the practitioner may need to rely more heavily on occupational wage data for the classification the person was training toward or actively pursuing. That's a judgment call that belongs in the report's methodology section, documented plainly rather than buried. The mechanics of lining pre- and post-injury wages up side by side are covered in more depth in pre-injury vs. post-injury wage comparison.

Establishing Post-Injury Earning Capacity

This is where the vocational half of the analysis does its heaviest lifting, and it typically draws on three separate inputs working together rather than one figure pulled from a table.

Medical restrictions. A functional capacity evaluation or treating-physician restrictions define the physical and cognitive boundaries the person now works within — lifting limits, sitting/standing tolerances, cognitive stamina, and so on. The vocational counselor doesn't generate this input; they apply it.

Transferable skills analysis. Given those restrictions plus the person's education, work history, and acquired skills, which occupations remain realistically open? This is a structured crosswalk exercise, not a guess — matching the worker's profile against recognized occupational classifications to identify what they can still reasonably perform and be hired to do.

Labor market and wage data. For each occupation identified as viable, the practitioner needs a credible, current wage figure — and this is where sourcing discipline separates a defensible report from a challenged one. Federal occupational wage estimates published through the Occupational Employment and Wage Statistics program are built from a large, ongoing survey: current estimates are constructed from a probability sample of roughly 1.1 million establishments, drawn in semiannual panels of about 186,000 to 189,000 each. That scale is precisely why OEWS-sourced wage figures hold up better under cross-examination than a wage pulled from a single job posting or a practitioner's memory of "what that job pays around here" — the number traces to a named, citable federal survey with a documented sample size, not an impression.

None of this — restrictions, transferable skills, wage data — is optional if the post-injury figure is going to survive scrutiny. A vocational assessment that skips straight to a wage number without documenting how that occupation was identified as viable is the single most common weak point opposing counsel will probe. See loss of earning capacity vocational assessment for how the assessment itself is structured.

How Is Loss of Earning Capacity Calculated, Step by Step

With pre- and post-injury capacity established, the arithmetic itself is the least controversial part of the process — provided the inputs feeding it are sound. Here's a worked example using round, illustrative figures (not a claim about any real occupation or wage):

Pre-injury earning capacity: $58,000/year. Post-injury earning capacity, given restrictions and the occupations remaining open: $41,000/year. Annual differential: $17,000. Projected over an applicable work-life expectancy horizon — the number of years the person would plausibly have remained in the workforce absent the injury — that annual differential becomes the basis for the total loss-of-earning-capacity estimate before any present-value adjustment.

Three things to notice in that example. First, the annual differential ($17,000) is the number most people fixate on, but it's meaningless without the occupational analysis behind both figures — anyone can subtract two numbers; the defensible work is in how each number was derived. Second, the work-life expectancy horizon is not simply "years until retirement age." It's typically drawn from published work-life expectancy tables and factors that account for labor force participation and mortality, and applying them correctly is its own specialized step — worth understanding on its own terms rather than treating as a rounding exercise. Third, whether that projected stream gets discounted to a present-value lump sum is, again, generally the economist's job, not the vocational counselor's. For the mechanics of that horizon calculation specifically, see work-life expectancy and loss of earning capacity.

What a Vocational Practitioner Documents — and What They Don't Opine On

The credibility of a loss-of-earning-capacity figure rests less on the final number than on the visible chain of reasoning behind it. A practitioner's report should let a reader — an attorney, a claims examiner, or opposing counsel — trace every figure back to its source without asking a follow-up question.

What a vocational practitioner typically documents:

• The occupational classification and wage source used for both pre- and post-injury capacity, cited by name.
• The transferable skills analysis showing how post-injury occupations were identified as viable.
• The medical restrictions relied upon, and whose evaluation they came from.
• Any assumptions made where the record was incomplete, stated plainly rather than smoothed over.

What a vocational practitioner does not opine on, as a rule: legal causation, the ultimate discount rate or present-value calculation (an economist's function), medical permanency or prognosis (a physician's function), or whether the resulting report will be deemed admissible by a given court. The vocational counselor organizes and estimates; the credentialed professional's judgment and signature — and, where applicable, the retained economist's and physician's — are what turn the organized estimate into an opinion the trier of fact can weigh. Rules about who may render which opinion, and what a compensable loss of earning capacity even means, differ by jurisdiction and by claim type — workers' compensation, personal injury, and long-term disability each define it differently, and a state or provincial rule should never be assumed to generalize elsewhere. Confirm the applicable standard with the relevant board, court, or claims examiner before finalizing a report. For how this documentation typically gets packaged for a personal-injury matter specifically, see loss of earning capacity report for personal injury, and for where the vocational counselor's role sits relative to the rest of the litigation team, see the forensic vocational expert witness's role.

Building a Defensible Record from the Start

The math behind a loss-of-earning-capacity figure is not the hard part. The hard part is building — and keeping — a record where every wage figure, every occupational classification, and every assumption is documented at the moment it's made, so that six months later, in a deposition, the practitioner can answer "walk me through exactly how you got that number" without hesitation.

If your current process is a spreadsheet you reconstruct from memory each time opposing counsel asks, that's the gap worth closing before the next report goes out the door. The Forensic Loss-of-Earning-Capacity Report Kit is a structured template built around this exact component breakdown — pre-injury capacity, post-injury capacity, wage sourcing, work-life horizon, and documented assumptions — so the reasoning chain is built in rather than reconstructed after the fact. Download the template and see how it maps to your next report.