We regularly hear this question from employers: “we already comply with the OHS Act, so why would we need ISO 45001 as well?” It’s a fair question. The two aren’t substitutes for each other: they operate at different levels.
The OHS Act is the legal floor
The Occupational Health and Safety Act sets out your legal obligations as an employer in South Africa: risk assessments, safety representatives, incident reporting, and specific requirements depending on your industry. Compliance with the Act is mandatory, not optional, regardless of whether you pursue ISO 45001.
ISO 45001 is a management system, not a checklist
ISO 45001 requires something the Act doesn’t explicitly demand in the same structured way: top-management accountability for safety performance, documented objectives with measurable targets, systematic internal audits, and a formal management review cycle, plus explicit worker participation in shaping the system.
Why pursue both
In practice, a well-implemented ISO 45001 system becomes the engine that keeps you compliant with the OHS Act on an ongoing basis, rather than compliance being something you scramble to prove after an inspection or incident. It also signals to principal contractors, insurers, and tender evaluators that your safety management is systematic, something an OHS Act compliance file alone doesn’t demonstrate as clearly.
How the two fit together
The OHS Act sets out what you must do. ISO 45001 is the management system that makes sure you do it consistently, with evidence to show for it.
Already OHS Act compliant?
If your OHS Act compliance file is solid, you’re closer to ISO 45001 than you might think. Most of the gap is the management-system layer on top (accountability, objectives, internal audit, management review), not the underlying safety controls. See our ISO 45001 service or get in touch for a gap assessment against what you already have in place.