WSIB in Ontario: The Complete Guide for Trades and Contractors

If you run a trades business in Ontario, WSIB is one of those things you can't afford to ignore. Whether you're a solo operator wondering if you even need coverage, a GC hiring subs, or a new apprentice trying to understand the system — this guide breaks it all down in plain language.

What Is WSIB?

The Workplace Safety and Insurance Board (WSIB) is Ontario's workplace insurance provider. It's not private insurance — it's a provincial agency that runs a no-fault insurance system for workplace injuries and illnesses.

Here's the deal: if a worker gets hurt on the job, WSIB covers their medical costs, rehab, and lost wages. In exchange, employers pay premiums and workers give up the right to sue their employer for workplace injuries.

Think of it as a trade-off that protects both sides:

Workers get guaranteed coverage without having to prove their employer was at fault
Employers get protection from lawsuits and predictable insurance costs

Who Needs WSIB Coverage in Ontario?

Mandatory Coverage

In Ontario's construction industry, WSIB coverage is mandatory for most businesses. This includes:

General contractors and their workers
Subcontractors with employees
Independent operators in construction (even if you work alone)
Any business in a Schedule 1 or Schedule 2 industry (construction is Schedule 1)

This is different from many other industries where only businesses with employees need coverage. In construction, even sole proprietors with zero employees must register.

Optional Coverage

Some business owners can opt for optional personal coverage:

Partners in a partnership
Executive officers of a corporation
Sole proprietors in non-construction industries

If you're in construction, you don't get to choose — you're in.

How WSIB Works for Subcontractors

This is one of the most misunderstood parts of WSIB — and it's where a lot of GCs and subs get tripped up.

If you're a sub, you need your own WSIB account. Period. Even if you're a one-person operation with no employees, if you're doing construction work in Ontario, you must be registered.

If you're a GC hiring subs, here's the critical part: if your sub doesn't have active WSIB coverage, you inherit the liability. That means:

You're responsible for paying their WSIB premiums
If their worker (or the sub themselves) gets injured on your job site, the claim goes against your account
Your experience rating takes the hit, which raises your premiums going forward

This is exactly why clearance certificates exist. Before a sub sets foot on your site, request their clearance certificate. It takes 30 seconds to verify online and can save you tens of thousands of dollars.

The flow looks like this:

Sub registers with WSIB and gets their own account
Sub pays their own premiums based on their payroll and rate group
Before starting work, sub provides GC with a valid clearance certificate
GC verifies the certificate (valid for 90 days)
If the sub's coverage lapses, the GC needs a new certificate before work continues

What about "independent operators"? Some subs argue they're independent contractors, not employees, so they don't need WSIB. In construction, this argument doesn't fly. WSIB requires registration for independent operators in construction regardless of employment status. The test isn't whether you have an employer — it's whether you're doing construction work in Ontario.

Can I Get WSIB Coverage on Myself as a Business Owner?

Yes — but whether it's mandatory or optional depends on your business structure.

Sole proprietor in construction: You're automatically covered. Your registration covers you personally, and your premiums are based on your earnings. If you fall off a roof, WSIB pays your medical bills and replaces your income at 85% of net (up to the maximum).

Incorporated (corporation) with yourself as an officer: Your personal coverage is optional. The corporation must register for WSIB to cover any workers, but you as the executive officer can choose whether to include yourself. If you opt in, you set a coverage amount (your estimated personal earnings) and pay premiums on that amount.

Partnership: Each partner's personal coverage is optional. Same as corporate officers — the business must cover workers, but partners can choose.

Should You Opt In?

If your coverage is optional, here's the honest breakdown:

Reasons to opt in:

If you're physically on job sites, the injury risk is real — one accident without coverage could bankrupt you
WSIB covers rehab, lost wages (85% of net), and permanent impairment — private disability insurance often has gaps, exclusions, and longer waiting periods
Having your own WSIB coverage shows clients you're fully insured, which builds trust
It's tax-deductible as a business expense

Reasons some owners skip it:

Cost — premiums on a $100,000 earnings estimate at a $5.00 rate = $5,000/year
They already have private disability and accident insurance
They're primarily office-based and rarely on site

Our take: If you ever set foot on a construction site — even occasionally — opt in. The cost of premiums is nothing compared to the cost of a serious injury with no coverage. A broken leg can easily run $50,000+ in lost income alone, never mind medical costs that OHIP doesn't cover (physio, orthotics, prescription drugs).

What Happens If You Don't Register?

Operating without mandatory WSIB coverage is illegal. Consequences include:

Fines up to $100,000 and/or six months in jail for individuals
Corporate fines up to $500,000
Retroactive premiums — WSIB can charge you back premiums to the date you should have registered, plus penalties
Personal liability — without WSIB, injured workers can sue you directly. Your home, savings, and business assets are all on the line

How to Register for WSIB

Registration is straightforward and done online:

Go to the WSIB website at wsib.ca and click "Register"
Create an account — you'll need your business number (BN) from the CRA
Provide your business details: legal name, operating name, business address, type of work
Choose your classification — WSIB uses rate groups based on the type of work you do. Construction trades each have specific classification codes (e.g., residential construction, electrical, plumbing)
Estimate your payroll — include wages, salaries, and payments to subcontractors who aren't independently registered
Submit — you'll get your WSIB account number, usually within a few business days

What You Need to Register

Have these ready:

CRA Business Number
Business legal name and operating name
NAICS code (North American Industry Classification System)
Estimated annual payroll
Start date of operations
Contact information

How Much Does WSIB Cost?

WSIB premiums are based on two things: your rate group and your insurable earnings.

Premium Rates

Each type of work has a base premium rate expressed as a dollar amount per $100 of insurable earnings. For example:

Trade	Approximate Rate (per $100 of earnings)
General construction	$4.00 – $6.00
Electrical	$2.50 – $4.00
Plumbing / HVAC	$3.00 – $4.50
Roofing	$6.00 – $9.00
Landscaping	$3.50 – $5.00
Concrete / Masonry	$5.00 – $7.00

Rates vary by specific classification and your individual experience. These are approximate ranges.

How Premiums Are Calculated

The formula is simple:

Premium = (Insurable Earnings ÷ 100) × Premium Rate

So if you're a general contractor with $500,000 in annual insurable earnings and your rate is $5.00 per $100:

$500,000 ÷ 100 × $5.00 = $25,000/year

What Counts as Insurable Earnings?

Gross wages and salaries
Commissions and bonuses
Vacation pay
Payments to subcontractors who aren't WSIB-registered (this is a big one — more on this below)

The Experience Rating System

Your individual premium rate isn't just the base rate. WSIB adjusts it based on your claims history:

Fewer claims than average → your rate goes down (you get a rebate)
More claims than average → your rate goes up (you pay a surcharge)

This is why safety programs aren't just the right thing to do — they directly save you money.

How to Pay Your WSIB Premiums

WSIB offers several payment options:

Payment Schedule

Monthly — most common for larger employers
Quarterly — available for smaller businesses
Annual — pay everything upfront at the start of the year

Payment Methods

Pre-authorized debit (PAD) — set it and forget it
Online banking — add WSIB as a payee through your bank
Cheque — mailed to WSIB (slowest option)
WSIB online services — pay directly through your account

The Annual Reconciliation

At the end of each year, you must file an Annual Reconciliation (formerly called the Annual Return). This is where you:

Report your actual insurable earnings for the year
Compare them to your initial estimate
Pay any difference (or get a refund if you overestimated)

Due date: March 31 of the following year. Late filing means penalties.

WSIB Clearance Certificates — Why GCs Care

This is where WSIB directly affects your ability to get work, especially from general contractors.

What Is a Clearance Certificate?

A Clearance Certificate confirms that a business:

Is registered with WSIB
Has paid all premiums owed
Is in good standing

Why It Matters

Under Ontario law, if a GC hires a subcontractor who doesn't have WSIB coverage, the GC becomes liable for that sub's premiums — and for any workplace injuries the sub's workers suffer.

That's why most GCs won't even consider hiring you without a valid clearance certificate. It's not them being difficult — it's them protecting their business.

How to Get a Clearance Certificate

Log in to your WSIB online account
Go to "Clearance Certificates"
Request a certificate — it's generated instantly if your account is in good standing
Share it with the GC or project owner

Clearance certificates are valid for 90 days. Many GCs will request a new one for each project or at regular intervals.

Pro Tip: Keep Your Account Current

If your account has outstanding premiums or unfiled reconciliations, you cannot get a clearance certificate. This means you can't bid on jobs that require one — which is most commercial and many residential projects. Stay on top of payments.

Filing a WSIB Claim

If a worker gets injured or develops an occupational illness:

For Employers

Provide first aid and get medical attention
Report the injury to WSIB within 3 business days using Form 7 (Employer's Report of Injury)
Continue paying the worker for the day of injury
Cooperate with WSIB during the claim process
Offer modified work when the worker is able to return

For Workers

Get medical treatment — tell the doctor it's a workplace injury
Report to your employer as soon as possible
File a claim with WSIB using Form 6 (Worker's Report of Injury) — you can do this online
Follow your treatment plan and stay in touch with WSIB

What WSIB Covers

Medical costs — treatment, prescriptions, medical devices
Lost wages — 85% of net earnings (up to a maximum)
Rehabilitation — physical therapy, retraining if you can't return to your previous job
Permanent impairment — lump sum or ongoing payments if you have lasting effects
Fatal claims — survivor benefits for dependents

Common WSIB Mistakes Trades Make

1. Not Registering Independent Subs

If you hire a sub who isn't WSIB-registered, you're on the hook for their premiums and any claims. Always verify coverage before they start work.

2. Underreporting Earnings

It might be tempting to lowball your payroll estimate to reduce premiums. Don't. WSIB audits are real, and the penalties for underreporting are steep — up to 100% of the shortfall plus interest.

3. Missing the Reconciliation Deadline

The March 31 deadline for annual reconciliation is firm. Late filing means automatic penalties and potential loss of your clearance certificate.

4. Not Reporting Injuries

Some employers try to handle injuries "off the books" to protect their experience rating. This is illegal and can result in fines up to $100,000. Plus, if the worker's condition worsens, you'll face much bigger problems.

5. Ignoring the Experience Rating

Your claims history directly affects your premiums. Invest in safety training, proper equipment, and a return-to-work program. It pays for itself.

How TradeBench Helps with WSIB Compliance

Building a trusted network means working with people who take compliance seriously. On TradeBench:

Clearance certificate verification is part of the trust path — GCs can verify that subs in their bench are WSIB-compliant
Network transparency means you know who you're working with before the first day on site
Reputation tracking helps you build a bench of reliable, compliant subcontractors

When you're building your bench on TradeBench, WSIB compliance isn't just a checkbox — it's a signal that you run a professional operation.

This guide is for informational purposes only and does not constitute legal or financial advice. WSIB rates, rules, and processes can change — always verify current information at wsib.ca or consult with a licensed insurance professional.