---
title: "Cost of a workplace injury, and the business case for prevention"
description: "Price an injury line by line, indirect costs included, and turn it into a decision paper. No multiply-by-four shortcut, because that is the first thing finance will challenge."
lede: "This page will not give you an average. It makes you price an injury line by line, including everything your accounting system will never code to the injury — and that list is what persuades, not the total."
jurisdiction: "Canada"
locale: "en-CA"
publishedOn: 2026-09-06
reviewedOn: 2026-09-06
canonical: "https://safeally.net/en-ca/tools/cost-of-a-workplace-injury/"
downloads:
  - label: "One-page business case"
    url: "https://safeally.net/downloads/accident-cost/en-ca/cost-of-an-injury-business-case.xlsx"
    format: "xlsx"
    note: "The line-by-line costing, experience rating explained at the top, and the payback with its assumptions on show. No multiplier anywhere in the file."
sources:
  - label: "Premiums and payment"
    url: "https://www.wsib.ca/en/businesses/premiums-and-payment/understanding-your-rate"
    publisher: "WSIB Ontario"
  - label: "Industry health & safety data"
    url: "https://www.worksafebc.com/en/about-us/data-insights/industry-health-safety-data"
    publisher: "WorkSafeBC"
  - label: "National Work Injury / Disease Statistics Program"
    url: "https://awcbc.org/data-and-statistics/national-work-injury-disease-statistics-program"
    publisher: "AWCBC"
  - label: "Canada Labour Code (RSC 1985, c. L-2), Part II"
    url: "https://laws-lois.justice.gc.ca/eng/acts/l-2/"
    publisher: "Justice Laws Website"
---

# Cost of a workplace injury, and the business case for prevention

This page will not give you an average. It makes you price an injury line by line, including everything your accounting system will never code to the injury — and that list is what persuades, not the total.

You are probably looking for a number: "a workplace injury costs an average of $X." This page will not give you one, deliberately.

Not because such numbers do not circulate — plenty do — but because an average does not survive the first serious question from a finance director, which will be: _"where does that come from?"_ A national average across every industry, every severity and every size of employer says nothing about the injury you are actually talking about.

What survives that question is a list of lines the person across the table can argue with one at a time. It takes longer to build. It is the only version that gets a budget approved.

## The multiplier, and why it is not here

You will have met the rule: "indirect costs are three to five times direct costs." It is in training material, in brochures, in vendor decks.

It has two problems.

**It is badly sourced.** It traces back to old work, in industrial contexts and insurance systems that are not the current ones. Something measured once, somewhere, became a universal constant through repetition.

**And it disarms you.** A total produced by multiplying by four collapses in one sentence: your counterpart only has to dispute the coefficient. A total built from twelve lines gets argued line by line — and if three get struck out, nine remain.

That is why this calculator asks you to price each item. It is more tedious. It is the only version that holds.

## What shows up on an invoice

**Wages paid and not worked.** Time on the day of the injury, any top-up you pay above board benefits, and time lost to medical appointments and modified-duty scheduling.

**Claim costs charged to your account.** Do not estimate this one — read it off your board statement. It is the figure that moves your premium, and it is also worth checking annually: misallocated claims are common enough to be worth an hour of somebody's time.

**Replacement labour.** Overtime, temporary staff, agency workers. And if nobody replaced them, it is not zero — it is the value of the output that did not happen.

**Damaged equipment and clean-up.** Machine, product, materials, repair, disposal. This line is missed almost every time because it lands in a different budget from safety.

## What never gets coded to the injury

This is the half that changes the conversation, and no accounting system produces it on its own.

**Investigation time.** Supervisor, safety lead, joint health and safety committee, management. A serious investigation of a lost-time injury is easily dozens of hours in total. Price them at loaded hourly cost: this is time that did not go somewhere else.

**Claims administration.** Reporting, correspondence with the board, any objection, return-to-work planning, and months of file management afterwards.

**Training the replacement.** Mentoring time, reduced output while learning, scrap and rework. On a skilled position, this is counted in weeks.

**Disruption.** Line stoppage, late delivery, contract penalties, rescheduling. In industry it is almost always the biggest line, and almost never priced, because it dissolves into the production numbers.

**Effect on the crew.** Reduced output, absence in the following weeks, turnover. Hard to price, which is not a reason to enter zero. Put a low estimate in and **say that it is an estimate**: a figure declared as an estimate is credible, one presented as fact is not.

## Experience rating, and the timing trap

This is where prevention business cases usually come apart — by promising a saving that will not arrive when it was promised.

Every board runs some form of experience rating: a rate for your industry class, then movement within it based on your own record. Three features generalise across provinces.

**It runs on claims costs, not claim counts.** One serious claim outweighs a dozen minor ones. A falling number of claims with rising claim costs is a premium going up, and a business case built on "we had fewer injuries" will be contradicted by the invoice.

**It runs on a multi-year window, with a lag.** Good performance this year shows up two or three years out. Telling a CFO otherwise is a mistake they will remember the next time you ask for something.

**The mechanics change.** Boards revise their rate-setting models, and superseded documentation stays online for years. Quote your board's current material, not a search result — and if you are operating in more than one province, quote each of them, because they differ.

There is also a size effect worth naming out loud: for a small employer whose rate is essentially the class rate, the premium argument barely moves. The real cost of the injury is undiminished — replacement, disruption, investigation — but the premium is not where you will find it. Say so rather than letting someone discover it later.

## Building the decision paper

The calculator chains four questions, and the third one carries everything.

1. **How many comparable injuries a year?** Be conservative. An inflated count is the first thing that gets challenged.
2. **What does the measure cost, once?** Equipment, installation, engineering, associated training.
3. **What reduction do you expect?** The weakest number on the page, and it is yours rather than ours. Say where it comes from: a supplier claim and a result measured on a pilot line are not the same evidence. If you genuinely do not know, use a deliberately pessimistic figure and show that the case still holds — far more convincing than an optimistic scenario.
4. **What does it cost every year?** Maintenance, consumables, inspection, and the time the measure adds to the task. That last part is always forgotten, and it is what decides whether the control gets bypassed in six months.

The payback figure that comes out is not a forecast. It is a way of making explicit the assumptions that would otherwise stay implicit, and letting your counterpart argue with them — which is exactly what a decision paper is for.

## Three arguments that carry more than the number

**Due diligence, priced.** Canadian enforcement runs on having taken every precaution reasonable in the circumstances, and the defence is made of records. A prevention measure with a dated assessment, an owner and a completion record is not only safer — it is the evidence you will want to have. That argument reaches a general counsel in a way a payback period does not.

**Where you sit in your industry.** Your board publishes rates by classification. Positioning yourself against your own rate group speaks louder than an absolute amount.

**The cost of doing nothing, with a date.** A paper that says "this hazard cost us $X last year and will cost us $X again this year if nothing changes" has a deadline. A paper without a deadline gets deferred.

## What the tool does not do

It is not a quote. It adds up what you type and knows nothing about your collective agreement, your rate group, or how your finance team codes hours.

It stores nothing and sends nothing: the amounts stay in your browser. That matters more here than elsewhere, because these are figures you would rather not have circulating before a decision is made.

And it does not replace your finance team. The best use of this page is to take a list of line items away from it and go and get the real numbers from the people who hold them — with a useful side effect: they become part of the case.

## If your method is better

This page describes one way of costing an injury, not the only one. It is precisely the ground on which the people who actually get budgets approved have built their own methods: a template agreed with finance, a loaded hourly rate negotiated once and reused, a dashboard that tracks cumulative claim cost rather than claim count.

If you have one that gets signatures, that is exactly what this site exists to collect and give back to the trade.