WSIB & Provincial Registration

Who This Guide Is For

You've incorporated (Guide 1) and registered with CRA (Guide 2). You have your corporation number, your Business Number, and your HST account. Now you need to register with the Workplace Safety and Insurance Board (WSIB), the single most construction-specific registration you'll make.

In Ontario construction, WSIB isn't optional. Construction is a Schedule 1 mandatory industry, meaning every construction employer must register and pay premiums, no exceptions. And every project owner, general contractor, and client you'll ever work with will ask for your WSIB clearance certificate before they'll let you on site or pay your invoice.

No clearance certificate = no work. It's that simple.

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How WSIB Works: The Basics

WSIB is Ontario's no-fault workplace insurance system. Here's the deal:

• You pay premiums based on your payroll and your industry classification rate
• Your workers get coverage for workplace injuries and occupational diseases, including medical costs, wage replacement, and rehabilitation
• In exchange, workers give up the right to sue you for workplace injuries (this is called the "historic compromise")
• If a worker gets hurt, WSIB pays the costs, not you. No lawsuits, no out-of-pocket for medical bills, no personal liability

For a construction company, this is critical. Construction is one of the highest-risk industries. Without WSIB, a single serious injury could bankrupt your company through a lawsuit. WSIB transfers that risk to the collective insurance pool.

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Before You Start: What You Need

• Business Number (BN) from CRA
• Corporation's legal name and number
• Business address
• Date you started (or will start) construction work
• Description of your construction activities
• Estimated annual payroll (your best guess for the first 12 months)
• Number of workers (including yourself if you perform construction work)
• Banking information (for premium payments)
• Your personal information (if you're a director/officer who also works on site, as this matters for optional coverage, explained below)

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Step-by-Step: WSIB Registration

Step 1: Determine Your Classification

WSIB classifies businesses by rate group based on the type of work performed. Your rate group determines your premium rate, expressed as a dollar amount per $100 of insurable payroll.

Construction rate groups and approximate 2025 premium rates:

These are base rates. Your actual rate may be higher or lower based on WSIB's experience rating programs (see "After Registration" below). New businesses start at the base rate for their classification.

If your company does multiple types of work (e.g., general contracting that includes framing, drywall, and painting), WSIB will classify you based on your predominant activity, the one that generates the most revenue. You don't register multiple rate groups unless you have genuinely separate operations.

Step 2: Register Online

Where: wsib.ca/en/businesses/register-and-report

How: Click "Register your business" and follow the online process. You can also call 1-800-387-0750.

Information required:

1. Legal name and Business Number: must match CRA records exactly

2. Business address and mailing address

3. Date you need coverage to start. This is when your workers first performed or will perform construction work. Don't delay this. If you have workers on a site before your registration is effective, you have an uncovered gap, and WSIB can penalize you retroactively.

4. Nature of business. Describe your construction activities in plain language. WSIB assigns the rate group based on this description.

5. Estimated annual insurable payroll. Your best estimate of total gross payroll for the first 12 months. This includes:

   • Wages and salaries
   • Commissions and bonuses
   • Vacation pay
   • Overtime pay
   • Taxable benefits
   • Directors' compensation (if they perform construction work)

   Does NOT include:

   • Dividends
   • Investment income
   • Subcontractor payments (they carry their own WSIB)

6. Number of workers

7. Banking information for premium payments via pre-authorized debit

Processing time: Registration is typically processed within 3-5 business days. You'll receive your WSIB account number (also called your "firm number"), a 7-digit number you'll use for all future WSIB dealings.

Step 3: Understand How Premiums Work

WSIB premiums are calculated as:

Premium = (Insurable Payroll / 100) x Premium Rate

Example:

Annual payroll:    $200,000
Premium rate:      $4.50 per $100
Premium:           ($200,000 / 100) x $4.50 = $9,000/year

For a solo owner-operator with no employees:

Here's where it gets interesting. If you're a sole director/officer who also does construction work, you have two options:

Option A: Compulsory coverage of yourself If you personally perform construction work (you're on the tools, not just managing), WSIB may consider you a "worker" for coverage purposes. The rules are nuanced; an officer who solely manages/supervises is generally not a worker, but an officer who picks up a hammer is.

Option B: Optional Independent Operator coverage If you're a sole proprietor or the only worker in your corporation, you can apply for Independent Operator (IO) status. This is a special WSIB category where:

• You're covered for your own workplace injuries
• You're not required to report payroll in the traditional sense
• Your premium is based on your assumed earnings (you choose a level of coverage)
• Your clearance certificate will show IO status

Many sole-operator construction companies start here and transition to employer coverage when they hire their first employee.

Which one you need depends on your situation. If in doubt, call WSIB and explain your setup. Getting this wrong can mean you're paying premiums you don't need to, or worse, you're not covered when something happens.

Step 4: Set Up Premium Payments

WSIB offers several payment options:

Prepaid premiums (recommended for new businesses):

• Pay an estimated premium upfront for the year
• Reconcile at year-end based on actual payroll reported
• This is how you get your first clearance certificate, since you need to pay something first

Monthly pre-authorized debit:

• WSIB estimates your monthly premium and debits automatically
• Easier cash flow management
• Available after your first reconciliation period

Quarterly reporting:

• Report actual payroll quarterly
• Pay based on reported figures
• Most common for established businesses

For a brand-new business, the process is typically:

1. Register -> WSIB estimates your annual premium based on your estimated payroll
2. Pay an initial advance payment (often around $250-$500, depends on your estimated payroll and rate)
3. WSIB issues your first clearance certificate
4. At year-end (or at your reporting date), report your actual payroll
5. WSIB reconciles: if you paid too much, you get a credit; too little, you owe the difference

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Step 5: Get Your WSIB Clearance Certificate

This is the document you actually need to work. The clearance certificate proves:

1. You are registered with WSIB
2. Your account is in good standing (premiums are paid, payroll is reported)
3. Coverage is in effect for your workers

Why Everyone Asks for It

Under the Ontario Construction Act and the WSIA (Workplace Safety and Insurance Act), anyone who hires a contractor has potential liability for that contractor's WSIB premiums if the contractor doesn't pay. This is called "principal liability."

So when a general contractor hires you as a sub, they're potentially on the hook for YOUR WSIB premiums if you default. The clearance certificate is their proof that you're in good standing and they're protected.

In practice:

• General contractors require it before you start work
• Project owners require it for prequalification
• It's typically required with every progress billing / invoice
• Government and institutional clients require it with bid submissions
• Some require a certificate that's been issued within the last 30 days

How to Get It

Online (fastest):

1. Log in to WSIB's online services at wsib.ca
2. Navigate to "Clearance certificates"
3. Generate a new certificate
4. Download and/or email directly to whoever needs it

By phone: Call 1-800-387-0750

Important details:

• The certificate shows your firm number, legal name, effective dates, and a statement that your account is in good standing
• It has an issue date and is typically valid for up to 90 days (but many clients want one less than 30 days old)
• If your account is NOT in good standing (premiums owing, payroll not reported), you cannot get a clearance certificate. WSIB will issue a "letter of non-compliance" instead, which effectively shuts you out of every job site.
• You can generate unlimited certificates for free

The catch-22 for new businesses: You can't get a clearance certificate until your account is in good standing, and your account isn't in good standing until you've paid your initial premium advance. This is why Step 4 matters. Pay your advance immediately after registration so you can start getting certificates.

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Step 6: Employer Health Tax (Conditional)

The Employer Health Tax (EHT) is a separate Ontario payroll tax, distinct from WSIB. Many new business owners confuse them.

Do You Need to Register?

Only if your total Ontario payroll exceeds the exemption threshold.

• Current exemption: $1,000,000 (for eligible employers)
• Rate: 0.98% on payroll up to $200K, graduating up to 1.95% on payroll over $400K
• Private corporations with associated corporations share a single $1M exemption across all associated companies

For most new construction companies, EHT does not apply. If your annual payroll is under $1M, you're exempt. This means you don't need to register, file, or pay anything.

If You Do Need to Register

• Where: ontario.ca/document/employer-health-tax
• When: Within 15 days of the month in which your cumulative payroll exceeds the exemption
• How: Through the Ontario Ministry of Finance's ONT-TAXS online system
• Filing: Annual return due March 15 of the following year (if annual filer) or monthly if payroll is large enough

Don't worry about this one on Day 1. You'll know when you need it. Your payroll system or accountant should flag when you approach the $1M threshold.

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After Registration: Ongoing WSIB Obligations

Annual Reconciliation / Payroll Reporting

Every year (or quarterly, depending on your reporting schedule), you must report your actual insurable payroll to WSIB. This is how they calculate whether you've overpaid or underpaid premiums.

What to report:

• Gross payroll for all workers performing construction work
• Broken down by rate group if you have multiple classifications
• Subcontractor payments are NOT included (they carry their own WSIB)
• Directors who don't perform construction work are NOT included

Deadline: Based on your reporting schedule, typically the last day of February for annual reporters. Late reporting = no clearance certificate.

Experience Rating (NEER / MAP)

Once you have a few years of claims history, WSIB adjusts your premium rate based on your actual safety record:

• Fewer claims than average for your rate group -> your rate goes down (rebate)
• More claims than average -> your rate goes up (surcharge)
• No claims -> you get the maximum discount over time

This is why safety programs (see Guide 6) aren't just legal compliance; they directly reduce your WSIB premiums. A company with zero claims can eventually pay 30-40% less than the base rate. A company with serious claims can pay 50-100% more.

What Happens When a Worker Gets Injured

1. Immediate: Provide first aid, call 911 if needed, secure the scene
2. Within 24 hours: Report the injury to WSIB via the Form 7 (Employer's Report of Injury/Disease) if the worker requires health care or is off work
3. Also notify: Your Joint Health & Safety Committee or H&S representative, and the Ministry of Labour if it's a critical injury (as defined by O. Reg. 834)
4. Ongoing: Cooperate with WSIB on the claim, provide modified/return-to-work duties, maintain contact with the injured worker

Failure to report within the required timeframe can result in penalties. Construction companies are audited on this regularly.

WSIB Audits

WSIB audits construction companies more frequently than most other industries. They're looking for:

• Unreported payroll: are you paying workers cash or off the books?
• Misclassified workers: are "subcontractors" actually employees?
• Incorrect rate group: are you classified correctly based on your actual work?
• Under-reported earnings: does your reported payroll match your CRA filings?

WSIB can and does cross-reference your payroll reports with CRA T4 summaries. If the numbers don't match, expect a call. Back-assessments can go back up to 4 years with interest and penalties.

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Subcontractors and WSIB: The Rules

This is one of the most misunderstood areas for new construction companies.

If You Hire Subcontractors

When you hire a subcontractor, you need to verify their WSIB status before they start work. There are three possibilities:

1. They have their own WSIB account in good standing. Great. Request their clearance certificate. Keep it on file. You're protected from principal liability.

2. They don't have WSIB coverage. Under the WSIA, you (as the "principal") may be liable for their premiums. If they get hurt on your job and they have no coverage, WSIB will cover the claim and come after you for the premiums plus penalties. You must either:

• Require them to register with WSIB before starting work, or
• Report their earnings on YOUR WSIB account and pay premiums on their behalf (you can deduct this from their payments)

3. They claim to be an "independent operator." IO status means WSIB considers them self-employed and they carry their own optional coverage. You can verify IO status through WSIB's online system. But be careful: if WSIB later determines they were actually your employee (using the same tests CRA uses), YOU owe the premiums.

Best practice: Always get a clearance certificate from every sub before they start. Put it in your project files. If they can't produce one, don't let them on your site until they sort it out.

If You ARE a Subcontractor

The GC or project owner hiring you will ask for your clearance certificate. They may also ask for:

• Your WSIB account/firm number
• Proof of coverage for specific dates
• Premium rate information
• Claims history (for prequalification)

Having a clean WSIB record is a genuine competitive advantage. GCs prefer subs with low claims history because it reduces their own project insurance costs.

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What This Costs

Your WSIB premiums are a cost of doing business in construction. There is no way around them, and you cannot substitute private insurance for WSIB coverage. Budget for them from Day 1.

Tax treatment: WSIB premiums are a fully deductible business expense.

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Common Mistakes to Avoid

1. Delaying registration. If you have workers performing construction work before you're registered, you're exposed. WSIB can assess premiums retroactively to the date work started, plus penalties. Register before your first day on a job site.

2. Not paying the advance immediately. Until you pay your initial premium, you can't get a clearance certificate. Without a clearance certificate, you can't work. Don't let cash flow concerns delay this; it's typically only $250 and it's credited against your premiums.

3. Confusing WSIB with private disability insurance. They are not interchangeable. WSIB covers workplace injuries for your employees. Private disability covers you personally for any illness or injury. You may want both, but you legally need WSIB.

4. Not checking subcontractor clearance. You are potentially liable for uninsured subcontractors' WSIB premiums. One unregistered sub who gets hurt on your job site can cost you thousands. Check every time.

5. Under-reporting payroll. CRA and WSIB share data. If your T4 summaries show $200K in payroll but you reported $120K to WSIB, expect an audit, a back-assessment for the difference, and penalties. Report accurately.

6. Forgetting that dividends aren't payroll. If you pay yourself solely in dividends (no salary), that's not insurable payroll and you don't owe premiums on it. But you also don't have WSIB coverage for yourself. If you're personally doing construction work, consider paying yourself at least some salary so you're covered, or get IO coverage.

7. Letting your clearance lapse. Report your payroll on time and pay your premiums on time. The moment your account falls out of good standing, you can't get a clearance certificate, and every GC and project owner will be notified if they check. It's the fastest way to kill your pipeline.

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What Happens Next

With your WSIB registration and clearance certificate in hand, you've completed the three foundational registrations every Ontario construction company needs:

• Corporation (Guide 1)
• CRA: BN, HST, payroll, corporate tax (Guide 2)
• WSIB (this guide)

From here, the path branches based on what kind of construction work you do:

• Guide 4: Trade Licensing: If you do electrical, HVAC, elevator, fuel systems, new home building, or residential renovation in Toronto, you need specific licences from specific regulatory bodies. If you're a general contractor doing commercial or ICI work with no compulsory trades, you may be able to skip directly to Guide 5.
• Guide 5: Insurance: CGL insurance is mandatory for virtually all construction work. This is your next universal step after WSIB.