Frequently Asked Questions
What is WSIB and who needs it in Ontario?
The Workplace Safety and Insurance Board (WSIB) provides no-fault workplace insurance for Ontario employees. Most Ontario employers with one or more workers must register and pay premiums. Certain industries (like banking, most self-employed individuals) are exempt. Mississauga and GTA businesses in construction, manufacturing, retail, and healthcare typically require mandatory WSIB coverage. Insight Accounting CPA helps Toronto-area businesses determine their WSIB obligations and optimize premium management.
How is my WSIB premium rate determined?
WSIB assigns each business a rate group (classification unit) based on its primary industry (NAICS code). The premium rate is expressed per $100 of insurable earnings. Rates vary widely-office workers may have rates around $0.27 per $100, while construction or logging can exceed $5.00 per $100. Your rate may also be adjusted by an experience modifier (CAD-7) based on your claims history. Ontario CPAs in Mississauga and Toronto can review your classification to ensure accuracy and identify cost-saving opportunities.
What are insurable earnings for WSIB purposes?
Insurable earnings include gross wages, salaries, bonuses, commissions, and certain taxable benefits paid to WSIB-covered workers. There is a maximum insurable earnings cap (approximately $106,200 in 2026). Payments above this threshold are not subject to WSIB premiums. Contractors and independent workers may have different rules. GTA businesses should consult a Mississauga CPA to calculate insurable earnings accurately and avoid overpayment or underpayment penalties from WSIB.
Can I reduce my WSIB premiums?
Yes. Strategies include: (1) maintaining strong workplace safety programs to earn experience-based discounts, (2) ensuring correct rate group classification (misclassification often leads to overpayment), (3) excluding exempt workers (e.g., executive officers who opt out), (4) maximizing the earnings cap, and (5) challenging WSIB assessments or claims decisions. Insight Accounting CPA in Mississauga helps Ontario businesses reduce WSIB costs through accurate payroll reporting, claims management, and appeals. Many GTA clients save thousands annually through proactive WSIB planning.
When are WSIB premiums due and how do I pay?
Ontario employers must report insurable earnings and remit premiums to WSIB on a schedule based on payroll frequency-monthly, quarterly, or annually. Most businesses pay monthly. WSIB uses a pay-as-you-go system; you estimate premiums throughout the year and reconcile with actual earnings in your year-end report. Underpayment can result in interest charges; overpayment results in a credit or refund. Toronto and Mississauga CPAs assist with accurate WSIB reporting, reconciliation, and compliance to avoid penalties and optimize cash flow.