How to Calculate Payroll Tax in Ontario

Calculating payroll tax in Ontario requires understanding the various deductions, credits, and filing requirements. This guide provides a step-by-step approach to accurately determine your payroll tax obligations.

Overview of Ontario Payroll Tax

Ontario's payroll tax system is designed to fund public services and social programs. The main components include:

Employment Insurance (EI) premiums
Income Tax deductions
Payroll deductions for benefits
Workplace Safety and Insurance Board (WSIB) premiums

The Ontario government provides detailed guidelines on its website, but calculating the exact amount requires specific employee information and company policies.

Payroll Tax Formula

The total payroll tax in Ontario is calculated by summing several components:

Total Payroll Tax = EI Premiums + Income Tax Deductions + WSIB Premiums + Other Deductions

Each component has its own calculation method based on employee earnings, company policies, and government rates.

Step-by-Step Calculation

Determine the total earnings for each employee
Calculate Employment Insurance premiums based on earnings
Calculate Income Tax deductions from payroll
Calculate WSIB premiums based on job classification
Add any other applicable deductions
Sum all components to get the total payroll tax

Note: Rates and thresholds change annually. Always use the current year's values from the Ontario government website.

Worked Examples

Example 1: Single Employee

For an employee earning $50,000 annually:

Component	Calculation	Amount
EI Premiums	1.4% of earnings	$700
Income Tax	Based on tax brackets	$6,500
WSIB Premiums	Based on job classification	$1,200
Total		$8,400

Example 2: Multiple Employees

For a company with 10 employees earning an average of $45,000 each:

Component	Calculation	Amount
EI Premiums	1.4% of $450,000	$6,300
Income Tax	Based on tax brackets	$58,500
WSIB Premiums	Based on job classifications	$10,800
Total		$75,600

Deductions and Credits

Several deductions and credits can reduce your payroll tax liability:

Employment Insurance (EI) credits for hiring new workers
Income tax credits for certain expenses
WSIB premium reductions for safety programs
Provincial and federal tax credits

Eligibility for these credits varies and should be verified with the appropriate government agencies.

Filing Requirements

Payroll tax filings must be submitted according to Ontario's deadlines:

Monthly or quarterly payroll deductions reports
Annual summary reports
Special reports for large employers

Late filings may result in penalties and interest charges. Keep detailed records of all payroll transactions.

FAQ

What is the current EI premium rate in Ontario?: The current EI premium rate is 1.4% of insurable earnings, with a maximum contribution base.
How often do I need to file payroll tax returns?: Most employers must file monthly or quarterly payroll deductions reports, with annual summary reports required.
Are there any exemptions for small businesses?: Small businesses with certain revenue thresholds may qualify for simplified payroll tax reporting procedures.
What happens if I underpay my payroll taxes?: Underpayment may result in interest charges and potential penalties. It's important to pay the correct amount or make adjustments.
Where can I find official payroll tax rates and forms?: The Ontario government provides current rates and forms on its official website, along with detailed instructions.