Introduction

WSIB — the Workplace Safety and Insurance Board of Ontario — is a topic that many incorporated contractors approach with uncertainty. Am I required to have WSIB? Can I opt in? Can I opt out? What do the premiums cost, and are they deductible?

The answers depend on the nature of the work, the industry, and the corporate structure. This article clarifies the WSIB obligations for incorporated contractors in Ontario.

Mandatory vs. Voluntary Coverage

Not all industries in Ontario require WSIB coverage. The construction industry, however, is a mandatory coverage sector — which means most incorporated contractors in construction must register with WSIB, regardless of whether they have employees.

Businesses with employees in mandatory sectors: Must register with WSIB as employers and obtain Schedule 1 coverage for all workers, including employed workers and any workers who are deemed workers under the Act.

Independent operators (self-employed, no employees) in construction: Individual construction contractors who work for themselves and have no employees are generally required to register with WSIB as independent operators — and to carry their own coverage. This applies even when the contractor is incorporated.

The test for coverage is the nature of the work (construction, trades) — not the incorporation status of the business.

Working Shareholders in Construction Corporations

A working shareholder of a construction corporation — the incorporated contractor who also performs the physical work — is generally considered a worker under the Workplace Safety and Insurance Act and must be covered by WSIB. The corporation registers as an employer, and the working shareholder is covered as a deemed worker.

Premiums are paid based on assessable earnings for the working shareholder, subject to the maximum insurable earnings set by WSIB annually.

Premium Deductibility

WSIB premiums paid by a corporation are deductible as a business expense — they are a cost of operating in a mandatory coverage sector and are directly related to earning business income.

Where the premium is paid on behalf of a working shareholder, the premium is a legitimate corporate expense even though it benefits the individual — this is standard practice and treated equivalently to the employer's CPP and EI contributions for an employee.

Clearance Certificates

A clearance certificate from WSIB confirms that a contractor is in good standing — all premiums are paid and the account is current. Clearance certificates are commonly required by:

General contractors before engaging subcontractors

Government and institutional clients before project commencement

Prime contractors managing federal or provincial public infrastructure work

Operating without a clearance certificate when one is required can prevent a contractor from winning work on regulated projects and may result in the prime contractor being liable for the subcontractor's WSIB premiums.

For incorporated contractors, maintaining WSIB in good standing and being able to produce a clearance certificate on short notice is part of basic compliance.

WSIB vs. Private Disability Insurance

Coverage under WSIB provides wage replacement and medical benefits for workplace injuries — but the benefits are tied to WSIB's rate schedules and may be significantly lower than a working shareholder's actual earnings. Many incorporated contractors with higher income supplement WSIB coverage with private accident and disability insurance to ensure adequate income protection.

The premiums for private disability or accident insurance on a key person (the working shareholder) may or may not be deductible depending on whether the benefits, if received, would be taxable. The CRA's general position is that if the benefit is received tax-free, the premium is not deductible. If the benefit is included in income, the premium may be deductible.

When to Speak With a CPA

For incorporated contractors reviewing their WSIB position — particularly those who have not previously registered, or who are uncertain about whether their working shareholder arrangements meet the current requirements — a CPA can help ensure the corporation is correctly registered and that premiums are being deducted correctly.

Rotaru CPA works with incorporated contractors on compliance obligations including WSIB, payroll, and HST. Book a consultation to review your coverage and compliance position.