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Original version : Employer Audits




Employer Audits

The WSIB maintains a collective liability insurance system for most employers in Ontario. Employers who are covered under Schedule 1 of the Workplace Safety and Insurance Act (the Act) fund the system. These employers must contribute their fair share in premiums and comply with all responsibilities under the Act and its Regulations. Our employer audit program aims to educate and inform our employers, improve communication with our employer community and prevent irregular reporting. Our goal is to ensure that the insurance fund for injured worker benefits remains adequately funded. At the same time we try to maintain a fair and level playing field among employers operating similar businesses.

Who is audited?
Employers are chosen for an audit using various means, including:
What should I expect from an auditor?
We require our audit staff to:
How should I prepare for an audit?
A WSIB field auditor will contact an employer in writing notifying them of their scheduled audit. The auditor will outline the information that is required at the audit. Employers should have an individual present who can respond to questions that arise during the audit.

The following is information that is generally required to complete an audit.
How many prior years do you audit?
Generally, an auditor will examine the payroll records and other documents for the two years prior to the current year. If the auditor discovers irregular reporting, the audit may extend up to five prior years, plus the current year.

How long should an audit take?
The length of time to complete an audit will vary from employer to employer. Generally, the size of an employer’s operations will determine the time required to review the records. Also, the time taken will vary with the number of issues that arise before and during an audit.

The Audit
An audit requires an on-site visit by a field auditor. The auditor will review payroll information including T-4 summaries, verify the status of executive officers and review the employer’s business activity to ensure the employer is properly classified. The auditor will also review and make decisions on the status of any unreported contractors. The auditor’s preliminary findings are discussed with employers and the employer may request a copy of these findings. Once the auditor’s decision is approved, the employer will receive an audit findings letter explaining the reasons for the decision.

Note: Audit adjustments are due for payment upon receipt of the letter advising that the audit has been processed.


Sections of the Act relating to audits Sections of the Act of interest to an employer
Failure to comply with the Workplace Safety Insurance Act
A person or corporation who does not comply with the provisions of the Act is liable for fines and/or imprisonment. Sections 149 to 157 of the Act set out the offense provisions. For example, under section 155, an employer cannot deduct from a worker’s wages to cover the cost of WSIB premiums. On conviction, an individual is liable to a fine not exceeding $25,000 and a term of imprisonment not exceeding six months, or both. A company is liable to a fine not exceeding $100,000. Administrative penalties may also apply.

Dealing with the Employer Audit Services
Learn about your rights (48k, pdf) in dealing with the WSIB Employer Audit Services and our Fairness Pledge (12k, pdf).

Value for Money Audit
Employer Audit Program A value for money audit by Deloitte has concluded that the WSIB’s Employer Audit Program is achieving its objectives -- with financial benefits of the program exceeding costs by a ratio of 2.6 to 1.
Read the executive summary.

For more information, contact Employer Audit Services:









The Workplace Safety and Insurance Board
200 Front Street West
Toronto, ON M5V 3J1
Phone: (416) 344-1000
Toll free: 1-800-387-5540
Ontario Toll free: 1-800-387-0750
TTY: 1-800-387-0050
Web site: www.wsib.on.ca