Ask ten safety managers what IRS stands for and most will get it right: Internal Responsibility System. Ask what it actually means in practice, and the answers get vague fast.
What the Internal Responsibility System Actually Is
The Internal Responsibility System is not a document, a program, or a section you can point to in the Occupational Health and Safety Act. It is the idea the entire Act is built on top of.
The Ministry of Labour, Immigration, Training and Skills Development defines it plainly: a system within an organization where everyone has direct responsibility for health and safety as an essential part of their job. That idea traces back to Dr. James Ham, whose 1976 royal commission report on health and safety in Ontario mines became the blueprint for the OHSA itself. His core insight was this: government inspectors cannot be on every job site every day. The people who actually control the hazards, day to day, are the people already there. Safety works when the workplace polices itself, not when it waits for an inspector to show up.
Basically, what this means is simple: the OHSA does not try to regulate every task directly. It assigns duties to specific roles, employer, supervisor, worker, and lets those roles catch problems before an inspector ever has to.
Who Carries What Piece of It
The IRS only works if every role actually does its part. Here is how the OHSA splits it up.
The employer carries the largest share. Senior management is responsible for establishing the IRS, promoting it, and making sure it actually functions, not just exists on paper. The employer's core legal duty is to take every precaution reasonable in the circumstances for the protection of a worker, the same standard that shows up in nearly every court case fine WorkSafe Sounds covers.
Supervisors are responsible for making workers fully aware of the hazards they may encounter, ensuring the work is done safely, and responding to hazards brought to their attention. That last part matters. A supervisor who hears about a hazard and does nothing has broken their piece of the IRS, even if nothing has gone wrong yet.
Workers have a statutory duty to report hazards, work safely, follow safe work practices, use the PPE provided, and participate in the workplace's health and safety programs. The IRS gives workers three specific rights to back this up: the right to know about hazards, the right to participate in identifying and solving safety problems, and the right to refuse work they believe is dangerous.
Joint health and safety committees and health and safety representatives exist specifically to assess how well the IRS is functioning, not just to check boxes at a monthly meeting.
External parties, the Ministry of Labour, the WSIB, and health and safety associations, sit outside the workplace but reinforce it from the outside: setting standards, enforcing them, and building the prevention resources workplaces draw on.
Why This Shows Up in Every Court Case
Read enough Ontario court bulletins and a pattern appears. The violation is almost never a total absence of safety effort. It is a broken link in the IRS: a worker who was never acquainted with a hazard, a supervisor who did not connect a routine task to what could go wrong, an employer who had the technology to detect a hazard and simply did not install it.
Section 25(2)(d) of the OHSA requires an employer to acquaint a worker with any hazard in the work. That single subsection is really just the IRS's right to know, written into law. When it fails, it is rarely because nobody in the company cared about safety. It is because one link in the chain, one role, did not carry its piece.
Three Ways to Strengthen Your IRS This Month
- Test whether your workers actually know what they're supposed to know. Do not ask if training happened. Ask a worker to explain, in their own words, the specific hazard of the task they just did. If they cannot, the right to know is not functioning, no matter what the training log says.
- Give supervisors a real channel for hazards, and use it. If a supervisor hears about a hazard and there is no clear next step, expect it to happen again. Build a simple, fast reporting path and close the loop every time.
- Use your JHSC for what it is actually for. A joint health and safety committee that only reviews minutes from the last meeting is not assessing your IRS. Ask them, directly, where they think the system is weakest.
Ask your best supervisor to explain the Internal Responsibility System in their own words, not the acronym, the actual mechanics of who catches what. What they can and cannot explain will tell you exactly where your IRS needs work.