Class 4B vs Class 5: What's the Difference for Ontario Operators?

One of the most common points of confusion for Ontario operators dealing with the MSMSR is the difference between Class 4B and Class 5. They sound similar, they're both for smaller vessels, and they both require an SMS. But they have different compliance deadlines, different documentation requirements, and different enforcement postures from Transport Canada.

Here's exactly what separates them.

The One Question That Decides Your Class

The single biggest factor separating Class 4B from Class 5 is whether you carry passengers for hire.

• Class 4B: You carry passengers commercially. People pay to be on your boat.
• Class 5: You operate commercially but carry no passengers. Your vessel is used for work, not transport.

Both classes apply to Canadian vessels under 15 gross tonnes. Both require a documented Safety Management System. The differences are in the details.

Side by Side: Class 4B vs Class 5

Class 4B in Detail

If you're a Class 4B operator in Ontario, you're almost certainly running a water taxi, a fishing charter, a tour boat, or a small passenger ferry on inland waters. The Great Lakes, the Trent-Severn, the St. Lawrence - these are all within Class 4B territory.

Your grace period ended in July 2025. That means if you haven't submitted your Forms 85-0547A and 85-0547B with a complete SMS package, you are currently non-compliant. TC has the authority to inspect you at any time and can suspend your operating certificates if you can't produce a certified SMS.

What Class 4B requires in your SMS is the full set of elements from TP 15566 Part 3: safety policy, responsibilities and authorities, operational procedures, emergency procedures for every scenario relevant to your trade, non-conformity reporting, maintenance schedules, crew training records, and annual review process.

Class 5 in Detail

Class 5 catches a lot of operators who didn't realize commercial workboats were in scope. If you're running a vessel commercially - survey work, equipment support, water sampling, construction support - and you don't carry paying passengers, you're Class 5.

Your compliance deadline depends on when your vessel was registered:

• Registered before July 3, 2024: your deadline falls on the anniversary of your inspection or registry certificate, generally 2026 or 2027
• Registered after July 3, 2024: no grace period - you must comply from the date you begin operating

TC's current monitoring approach for Class 5 is reactive rather than proactive. They're not doing sweeps looking for non-compliant Class 5 operators the way they might for Class 4B passenger vessels. But that doesn't mean you're off the hook. A complaint, an incident, or a routine inspection can put you in the spotlight. And more importantly, the whole point of an SMS is to reduce the likelihood of an incident happening in the first place.

The SMS Requirements Are Essentially the Same

Here's what surprises most operators: the core SMS content requirements for Class 4B and Class 5 are largely the same. Both need documented safety policies, operational procedures, emergency procedures, maintenance schedules, crew training records, and annual reviews.

The differences are in the specifics of those procedures. A water taxi operation has different emergency scenarios than a survey vessel. A fishing charter has different crew certification requirements than a construction support boat. Your SMS has to reflect your actual operation - which is exactly why generic templates don't work.

Which Class Are You? A Quick Check

1. Do paying passengers board your vessel? Yes = Class 4B (inland/sheltered) or 4A (near coastal).
2. Is your vessel used commercially with no passengers? Yes = Class 5.
3. Is your vessel 15 GT or more? Yes = Class 2 or 3 - different requirements apply.
4. Not sure of your GT? Check your Certificate of Registry.

If you're still not sure, the classification question is worth getting right before you build any documentation. Building a Class 4B SMS when you're actually Class 5 (or vice versa) wastes time and can result in a rejected application.