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WSIB for contractors in Ontario runs on a myth that refuses to die. It goes: “I’m self-employed with no staff, so workers’ compensation is optional for me.” It has not been optional in construction since January 1, 2013. Independent operators, sole proprietors, partners and executive officers who carry on business in construction are deemed workers under the Workplace Safety and Insurance Act. They must register and pay premiums on their own earnings.
The consequence for an operator who believes the myth is not a warning letter. It is a retroactive premium assessment with interest on top. If he has been subcontracting to a general, it is also the loss of that relationship the day the general’s accountant asks for a clearance number he cannot produce. Meanwhile, the general who hired him without checking is on the hook for those unpaid premiums, up to the labour portion of the contract. Both sides lose money over a rule that takes ten minutes to get right.
WSIB for contractors: the myths and what the Act actually says
The table below is the whole argument in one place. Read it before you read anything else about WSIB for contractors. Most of the confusion comes from advice that was true in 2012, or is true for a consultant, and is simply wrong for construction.
| Myth | Reality in Ontario construction |
|---|---|
| “I have no employees, so I don’t need WSIB.” | Independent operators in construction must register and pay premiums on their own insurable earnings. The no-employees exemption applies to other industries, not this one. |
| “I’m incorporated, so the company is the worker, not me.” | The sole executive officer of a one-person construction corporation is an independent operator and must be covered. Incorporation does not create an exemption. |
| “I only do residential work, so I’m exempt.” | The home renovation exemption is narrow. It covers work on an existing private residence, hired and paid directly by the occupant or a family member, and nothing else. Take one job through a general, or one commercial contract, and the exemption is gone for the whole business. |
| “My general contractor covers me.” | The general holds a clearance so that WSIB does not pursue him for your premiums. It does not insure you. If you have no clearance, he can be assessed for what you owe. |
| “I’ll register once I have a crew.” | Material changes, including taking a non-exempt contract, must be reported within 10 days. Coverage is not applied retroactively in your favour, but assessments are. |
| “Premiums are based on my profit.” | Premiums are based on the labour you bill. If you supply labour and major materials without records that separate them, WSIB uses 60% of the contract value as insurable earnings. |
What WSIB for contractors costs in 2026
The average premium rate across all Ontario businesses for 2026 is $1.23 per $100 of insurable payroll. That is the lowest in more than 50 years, and the maximum insurable earnings ceiling is $121,700. Construction classes sit above the average. In recent years the Class G rates have run from roughly $1.50 per $100 for building equipment trades to more than $3.50 for foundation, structure and exterior work. Your own rate is adjusted for your claims record, and your 2026 figure is on your online statement, not in an article.
Consider a framing sub in Barrie billing $140,000 of labour-only work through two generals. His insurable earnings cap at $121,700. At a residential-class rate somewhere near $2.40 he owes roughly $2,900 for the year. That is real money, but it is not the number that hurts. The number that hurts is three years of that, plus interest, assessed in one letter after a general’s audit turns up a sub with no account. Furthermore, a reduced rate exists for non-exempt partners and executive officers who do no construction work. An independent operator is not eligible for it.
The clearance certificate is where the general gets caught
A clearance is a number WSIB issues confirming that a business is registered and current on its premiums. If you hire a subcontractor without obtaining one, and that sub has not paid, WSIB can collect from you. The exposure runs up to the labour portion of the contract. That is the mechanism that turns a sub’s oversight into the general’s bill. It is also why serious generals refuse to release a first payment without a valid clearance on file.
The operational failure is rarely deliberate. A general has eight subs on a build, three of them new this season. The clearance numbers live in an email thread from March. By September two have expired, one sub has changed his business name, and nobody has re-checked. Operators who attach the clearance number and its expiry date to each subcontractor’s record, and check it before every payment, do not have this problem. With SendWork holding each sub’s details and notes against the jobs they are assigned to, the expired clearance surfaces before the cheque is cut instead of after the audit.
BC and Alberta run different rules
The myth survives partly because it is closer to true elsewhere. In British Columbia, a sole proprietor with no employees is not automatically covered by WorkSafeBC. He can buy Personal Optional Protection instead. The moment you hire, registration becomes mandatory. Alberta’s WCB works on a similar pattern, with optional personal coverage for proprietors and mandatory registration once there are workers. Both provinces still use clearance letters, and both will pursue a principal for an unregistered sub’s premiums. So the clearance discipline is national, even where the personal-coverage rule is not. Anyone operating across provinces should treat Ontario as the strict case and confirm the others directly.
WSIB for contractors: the plainspoken conclusion
If you do construction work in Ontario for anyone other than a homeowner paying you directly, you need a WSIB account. You needed it before the first invoice. If you hire subs, you need their clearance numbers on file and re-checked before each payment. That is the entire rule for WSIB for contractors. Every myth in the table above is an attempt to talk around it. Our read is that the operators who skip registration are not saving a premium. They are financing an assessment at WSIB’s interest rate.
The coverage rules, exemptions, insurable-earnings method and 2026 rates are published by the WSIB on its independent operators in construction page. Confirm any figure in this article there for your own situation.
The same discipline that keeps clearances current also keeps your GST/HST remittance funded on time. Both fail when invoices and their dates live in a phone rather than a record. What can wait is optimizing your class rate through a safety program. What cannot wait is the account itself.
ON THE CLEARANCE THAT EXPIRED IN MARCH
Organized generals don’t inherit their subs’ premiums.
The sub’s premium becomes the general’s bill only when nobody can find the clearance. SendWork keeps each subcontractor’s details, notes and assigned jobs in one record, so the number that protects you is checked before payment, not reconstructed after an assessment.
Explore the record-keeping workflow for Ontario contractors →
