How Long Must Ontario Employers Keep WSIB and Payroll Records?

Running a compliant business in Ontario generates an overwhelming amount of paperwork. Whether you operate a bustling tech firm in Kitchener, a construction company in Vaughan, or a retail chain in Ottawa, human resources departments are constantly flooded with timesheets, injury reports, and payroll ledgers. Many business owners eventually ask their corporate law firm: “When can we legally throw all of this away?”

Destroying documents too early is a critical mistake. ⚠ Ontario employers are subject to overlapping retention laws enforced by the Workplace Safety and Insurance Board (WSIB), the Ministry of Labour, and the CRA. If an injured worker files an occupational disease claim years after leaving your company, or if WSIB triggers a random premium audit, missing payroll records will automatically result in heavy fines and unfavorable financial assumptions. This guide clarifies the statutory timelines for document retention and how to securely store your injury logs.

Step-by-Step Guide to WSIB and Payroll Record Retention

Managing record retention requires a clear internal policy. You must safely archive physical and digital files to protect the privacy of your staff while remaining fully prepared for a sudden government audit.

Step 1: Understanding the 6-Year Minimum Rule

The most important baseline for any Ontario business is the 6-year rule. Both the CRA and the WSIA require you to keep all payroll records, T4 slips, contractor invoices, and premium calculation logs for a minimum of six full calendar years after the year to which they relate. This allows WSIB auditors to retroactively review your accounts to ensure you classified your workers correctly and paid the correct premiums.

Step 2: Storing WSIB Form 7s and Claim Files

When an employee is injured, the employer completes a Form 7 (Employer’s Report of Injury). 📝 You must keep a copy of this form, along with any return-to-work plans, functional abilities forms, and correspondence with the WSIB adjudicator. Because occupational diseases (like noise-induced hearing loss or asbestos exposure) can take decades to manifest, many employment lawyers advise keeping specific injury incident reports indefinitely, even beyond the 6-year minimum.

Step 3: Maintaining First Aid Logs (Regulation 1101)

Under WSIB Regulation 1101, every employer must maintain a First Aid Log. Any time an employee receives minor first aid (even just a bandage for a cut), it must be logged with the date, time, and nature of the injury. These specific health and safety records must also be preserved and kept readily available for Ministry of Labour or WSIB inspectors upon request.

Step 4: Ensuring Privacy and WSIA Compliance

Medical documents related to WSIB claims contain highly sensitive information. Because commercial employers are not “health information custodians” under Ontario’s Personal Health Information Protection Act (PHIPA), their duty of confidentiality is not governed by PHIPA. Instead, the security and privacy of an employee’s medical records are directly regulated under Section 181(3) of the WSIA (in conjunction with Sections 37(4) and 59(6), which strictly prohibit unauthorized disclosure of medical information obtained from the Board) and the federal Personal Information Protection and Electronic Documents Act (PIPEDA). These files must be kept in separate, locked cabinets or secure, encrypted digital folders entirely isolated from general personnel files.

Step 5: Executing Secure Document Destruction

Once the statutory retention period has officially passed, you cannot simply throw old payroll or injury records into a standard recycling bin. To prevent identity theft and corporate liability, you must use a certified document shredding service for physical papers and secure data-wiping software for digital servers. Keeping a “Certificate of Destruction” is highly recommended for your corporate records.

How Much Does it Cost in Ontario?

Proper document management requires minor administrative investments that save businesses from catastrophic audit penalties. Below is a breakdown of potential costs and WSIB non-compliance fines in Canadian dollars (CAD) as of May 2026.

How Long Does the Process Take?

Record retention is an ongoing daily obligation. You must retain standard payroll and WSIB financial records for at least 6 full calendar years. If WSIB initiates an audit, they will typically request documents within a strict 14 to 30 day deadline. Failing to provide the archived records within this tight timeframe immediately triggers non-compliance penalties.

Frequently Asked Questions (FAQ)

Author: lawyerinfo.ca