WSIB for Ontario Trades: Coverage, Clearances, and the One-Officer Exemption
- Jul 30
- 7 min read
Updated: 5 days ago
Last reviewed: July 2026
WSIB coverage has been mandatory in Ontario construction since January 1, 2013. Independent operators, sole proprietors, partners and executive officers carrying on business in construction are all treated as workers and must be covered. A partnership or corporation can exempt exactly one partner or officer, and only if that person performs no construction work at all. If you hire a subcontractor, you must obtain a clearance certificate, and if you do not, you can be held liable for that subcontractor's unpaid premiums up to the labour portion of the contract.
That last sentence is the one that costs Ontario contractors real money, and it is the one most often ignored.
2026 WSIB numbers at a glance
Item | 2026 |
Maximum annual insurable earnings per person | $121,700 |
Average premium rate, all Ontario businesses | $1.23 per $100 of insurable payroll |
G1 Residential building construction | $2.18 |
G2 Infrastructure construction | $1.72 |
G3 Foundation, structure and building exterior (includes roofing) | $3.55 |
G4 Building equipment construction (plumbing, HVAC, electrical) | $1.54 |
G5 Specialty trades construction | $2.15 |
G6 Non-residential building construction | $1.61 |
Non-exempt partners and executive officers in construction (rate 755) | $0.20 |
Your class rate is a starting point, not your invoice. WSIB assigns your class from your predominant business activity, and your actual rate is then adjusted for your own claims experience.
Who has to be covered?
Since January 1, 2013, compulsory coverage extends to independent operators, sole proprietors, partners and executive officers carrying on business in construction. Each is treated as a deemed worker, and the business is the deemed employer.
Practically, that means a one-person incorporated trade with no employees still needs WSIB coverage. Being incorporated does not exempt you, and having no staff does not exempt you.
If you hire your first employee, you must register with WSIB within 10 calendar days.
The one-officer exemption, and how people lose it
A partnership or corporation carrying on business in construction may elect one partner or executive officer for an exemption from coverage. Two conditions:
That person performs no construction work. Periodic site visits are allowed, provided they are not working on site
A declaration is filed with WSIB on the approved form (1208A)
The definition of construction work is broader than most owners assume. It covers any manual work, skilled or unskilled, the operation of equipment or machinery, and the direct on-site supervision of workers.
That last item is the killer. An owner who walks the job and directly supervises the crew is performing construction work, and the exemption fails. Not "is at risk," fails. If the exemption is claimed anyway and a claim is later made, the position is difficult.
Two further limits: the exemption does not apply to incorporated independent operators, and it does not apply to sole proprietors. It is one person, per company, doing zero construction work.
The home renovation exemption
There is a separate, narrow exemption for exempt home renovation work. It applies where the work is performed by an independent operator, sole proprietor, partner or executive officer, on an existing private residence that is or will be occupied by the person who directly retains and pays them, or by a member of that person's family.
Two things to notice. The residence must already exist, so new builds are out. And the occupant must retain you directly, so the moment you are a subcontractor to a builder or general contractor, the exemption is gone even if the house is someone's home.
It also covers the individual only. If you have employees, they still need coverage.
Clearance certificates: the liability most contractors carry unknowingly
A clearance is a number WSIB issues confirming that a business is registered and up to date with its premiums.
In construction it is not optional. A principal who directly retains a contractor to perform construction work must obtain a clearance confirming that contractor is in good standing. It has to be in place before work starts and maintained through the contract.
If you do not get one, two things follow.
First, financial exposure. WSIB's position is that the principal may be liable for the contractor's payment obligations to WSIB, up to the value of the labour portion of the contracts. On a $200,000 job with $120,000 of labour, that is the size of the exposure you accepted to save five minutes.
Second, it is an offence. Failing to meet clearance requirements in construction is listed as an employer offence. Maximum penalties on conviction under the Act run to a fine of up to $25,000 or six months imprisonment, or both, for an individual, and up to $500,000 for a corporation.
A clearance is valid for up to 90 calendar days and is renewable. Note the "up to." It is not always a clean 90 days from the date of issue, so do not build your process on the assumption that it is.
The fix is unglamorous and takes a minute. Pull the clearance through WSIB's online service before the sub starts, save it in the job file, and diarize the renewal. Do it as part of onboarding, alongside collecting the Business Number and HST registration you need for your T5018 slips anyway.
How premiums are calculated and reported
Premium equals gross insurable earnings multiplied by your rate, divided by 100.
Insurable earnings follow the T4 box 14 basis: wages, salaries, bonuses, commissions, vacation pay, sick pay and taxable benefits, capped at $121,700 per person for 2026.
Reporting frequency is set by WSIB based on your annual insurable earnings:
Frequency | Annual insurable earnings | Due |
Monthly | $1,000,000 or more | Last day of the following month |
Quarterly | $20,000 to $999,999.99 | April 30, July 31, October 31, January 31 |
Annual | Under $20,000 | April 30 for the prior calendar year |
You must report even if payroll was nil for the period. Late reporting triggers a non-compliance charge. There is also an annual reconciliation.
For the construction-specific people, the basis differs: independent operators report on the labour portion of the contract, sole proprietors and partners on their self-employment business income, and executive officers on T4 employment income. WSIB also sets a minimum insurable earnings amount for these people, calculated as one third of the annual maximum.
One 2026 change worth knowing
The Second Injury and Enhancement Fund is being phased out. No new SIEF requests are accepted after July 16, 2026, though existing relief continues.
That matters to employers, not just to claims staff, because SIEF relief reduced the claim costs charged against an employer's experience. With it gone for new requests, a serious claim will flow more fully into your own rate. Which makes the boring stuff, documented safety practices and early return to work, worth more than it was last year.
Frequently asked questions
Is WSIB coverage mandatory for a one-person construction business in Ontario?
Yes. Since January 1, 2013 compulsory coverage extends to independent operators, sole proprietors, partners and executive officers carrying on business in construction. Being incorporated or having no employees does not exempt you.
Can an owner be exempt from WSIB coverage in construction?
A partnership or corporation can elect one partner or executive officer for an exemption, but only if that person performs no construction work and a declaration is filed with WSIB. Direct on-site supervision of workers counts as construction work and defeats the exemption.
What happens if I hire a subcontractor without a WSIB clearance certificate?
You may be held liable for that subcontractor's payment obligations to WSIB up to the value of the labour portion of the contract. Failing to obtain a clearance in construction is also an offence, with fines up to $25,000 for an individual and up to $500,000 for a corporation.
How long is a WSIB clearance certificate valid?
Up to 90 calendar days, and it is renewable. WSIB words it as "up to," so it is not always a full 90 days from the issue date.
What is the 2026 WSIB maximum insurable earnings amount?
$121,700 per person, up from $117,000 in 2025.
What is the WSIB premium rate for plumbing, HVAC and electrical contractors in 2026?
Those trades generally fall in Class G4, Building equipment construction, at $1.54 per $100 of insurable earnings for 2026. Your actual rate is then adjusted for your own claims experience.
Does the home renovation exemption cover me if I sub for a general contractor?
No. The exemption requires the work to be on an existing private residence occupied by the person who directly retains and pays you, or their family member. Working as a subcontractor to a builder or general contractor falls outside it.
How often do I have to report WSIB premiums?
WSIB sets your frequency from your annual insurable earnings: monthly at $1,000,000 or more, quarterly between $20,000 and $999,999.99, annually under $20,000. You must report even in a nil period.
Key takeaways
Mandatory coverage in construction since January 1, 2013, including one-person incorporated trades
One partner or officer can be exempt, but only if they do zero construction work, and direct on-site supervision counts as construction work
No clearance certificate from a sub means you can be liable for their WSIB debt up to the labour portion of the contract, plus it is an offence
Clearances are valid up to 90 days, so build renewal into your job file process
2026: ceiling $121,700, average rate $1.23, G4 trades $1.54, G3 including roofing $3.55
SIEF closes to new requests after July 16, 2026, so claims will hit your own experience rating harder
Talk to an accountant who works with trades
Our team handles WSIB reporting and reconciliation alongside corporate tax, bookkeeping, HST and payroll for trades and construction corporations across Mississauga, Oakville, Vaughan, Markham, King City, Caledon and Burlington. Clearance certificates and premium classification are the sort of thing that only becomes urgent once. Handled year-round in our accounting for Ontario trades.
Fixed fees quoted up front. Year-round support, not one rushed conversation at year end.
References: WSIB, expanded compulsory coverage in construction, clearance certificates in construction and 2026 premium rates. WSIB coverage and classification questions should be confirmed with WSIB directly. General information only.
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