Table of Contents
- What Is Employer Health Tax and Who Pays It
- Understanding the Ontario EHT Exemption Threshold
- How to Calculate Taxable Remuneration
- EHT Calculation Examples for Your Payroll
- Example 1: Business Below the Exemption Threshold
- Example 2: Business Above the Threshold (No Deductions)
- Example 3: Business with Eligible Deductions
- Example 4: Mid-Year Hiring and Partial-Year Remuneration
- Example 5: Large Employer Above $2.5 Million Payroll
- Tax Rate Reference Table
- Key Takeaways from These Examples
- How to Register for EHT in Ontario
- Filing Your Annual EHT Return and Common Mistakes
- Frequently Asked Questions
Last Updated: September 29, 2026
What Is Employer Health Tax and Who Pays It
The Employer Health Tax (EHT) is a payroll tax paid by employers in Ontario to fund the provincial health care system, and understanding how to calculate employer health tax in Ontario is essential for compliance. Most employers with payroll above a certain threshold must register and pay.
Any business operating in Ontario with annual payroll above the exemption threshold must register, including corporations, partnerships, sole proprietorships, and non-profits. The tax applies to remuneration for work performed in Ontario, regardless of employer location.
EHT applies to wages, salaries, bonuses, commissions, and taxable benefits for work performed in Ontario. Remote employees working from another province may not be subject to EHT.
Many small business owners assume EHT only applies to large corporations. In reality, once your payroll crosses the threshold, you’re liable. Register early to avoid penalties and interest charges from the Ministry of Revenue.
Understanding the Ontario EHT Exemption Threshold
The Ontario EHT exemption threshold determines whether your business must pay. Payroll below the threshold requires no registration or payment.
Businesses with total payroll below the exemption threshold are exempt. Once you cross it, you owe EHT on remuneration above the threshold level.
The threshold applies to total payroll across all Ontario-based employees in a calendar year. If that total exceeds the threshold, you owe EHT on the excess.
Wages, salaries, bonuses, commissions, taxable benefits, vacation pay, and severance all count toward the threshold.
If you own multiple businesses, their payroll combines for EHT purposes. You cannot split operations to avoid EHT by creating separate companies.
A common mistake is treating each business location as separate. If you own two stores or operate under multiple business names, their payroll combines for EHT purposes. Failing to report associated employers can trigger an audit and penalties.
How to Calculate Taxable Remuneration
Taxable remuneration is all compensation paid to Ontario employees and is essential for accurate EHT reporting.
Taxable remuneration includes gross wages, salaries, bonuses, commissions, performance-based pay, taxable benefits, and vacation pay.
What doesn’t count? Certain amounts are excluded from taxable remuneration. These exclusions reduce your EHT liability:
- Amounts paid for registered pension plan contributions
- Amounts paid for group life insurance premiums
- Amounts paid for health insurance premiums (up to certain limits)
- Amounts paid for short-term disability benefits
- Amounts paid for long-term disability benefits
- Amounts paid for workers’ compensation assessments
These exclusions directly reduce your taxable remuneration and EHT liability. A strong benefits package can meaningfully lower your tax.
If an Ontario employee works temporarily outside Ontario, their remuneration may still be taxable EHT. Document these assignments to protect against audit.
Taxable remuneration is gross pay minus eligible deductions for benefits and pension contributions. This is the number you use to calculate whether you owe EHT and how much.
EHT Calculation Examples for Your Payroll
The best way to understand how to calculate employer health tax in Ontario is to walk through a detailed, step-by-step example. This shows exactly how the tax works, where each number comes from, and what you actually owe.
Example 1: Business Below the Exemption Threshold
You run a small contracting business with three employees earning $280,000 annually. Since this is below the exemption threshold, you owe zero EHT and don’t need to register. Keep payroll records in case the Ministry questions your threshold status.
Example 2: Business Above the Threshold (No Deductions)
Your payroll reaches $750,000 with no eligible deductions. Taxable remuneration is $750,000 minus the exemption threshold. At 1.95%, your annual EHT owing is calculated on this amount.
Example 3: Business with Eligible Deductions
Your payroll is $900,000 with $50,000 in eligible deductions (health insurance and pension). Taxable remuneration is $850,000 minus the exemption threshold. At 1.95%, your EHT owing is calculated on this amount. The $50,000 in benefits can reduce your EHT.
Example 4: Mid-Year Hiring and Partial-Year Remuneration
You start with $200,000 payroll and hire mid-year, reaching the exemption threshold total. You owe no EHT since payroll equals the threshold exactly. Adding more payroll could trigger EHT.
Example 5: Large Employer Above $2.5 Million Payroll
Your payroll is $3.2 million with $225,000 in eligible deductions. Taxable remuneration is $2,975,000 minus the exemption threshold. At 1.95%, your EHT owing is calculated on this amount. Deductions can reduce your EHT.
Tax Rate Reference Table
| Payroll Size | Tax Rate | Applies To | Example |
|---|---|---|---|
| Below $500,000 | Exempt | No EHT owing | $280,000 payroll = $0 EHT |
| $500,000 to $2.5M | 1.95% | Amount above threshold | $750,000 payroll = $4,875 EHT |
| Above $2.5M | 1.95% | Amount above threshold | $3.2M payroll = $48,262.50 EHT |
Key Takeaways from These Examples
- Deductions matter: Each dollar in eligible benefits can reduce your EHT bill.
- The threshold is a cliff: Payroll of $500,001 owes $19.50 vs. $500,000 owing $0.
- Associated employers combine: If you own multiple businesses, add all payroll together before applying the threshold.
EHT calculation: (Total Remuneration − Eligible Deductions − Exemption Threshold) × 1.95%. Complexity lies in correctly identifying remuneration and qualifying deductions.
How to Register for EHT in Ontario
If your payroll exceeds the exemption threshold, you must register for EHT within strict deadlines or face penalties.
Register within a few months of crossing the threshold through the Ministry of Revenue’s online system. You’ll need your business registration number, payroll information, and employee details. Registration takes about 15 minutes.
Provide your business name, BRN, payroll information, threshold-crossing date, and payroll administrator contact. The Ministry assigns an EHT account number for all future filings. Payments are typically due quarterly or annually depending on payroll size.
Register as soon as you know your payroll will exceed the threshold. Don’t wait for year-end. Early registration gives you time to understand your obligations and set up systems to track and calculate EHT correctly.
Filing Your Annual EHT Return and Common Mistakes
Every employer with an EHT account must file an annual return reporting total remuneration and EHT owing. Filing deadlines are strict; late filings incur penalties. The Ministry cross-references your return against other tax records.
Filing Deadline and Submission Process
When is your return due? The annual EHT return is due by the Ministry of Revenue’s filing deadline. Check the current year’s deadline on the official website. Most returns are due in the spring following the calendar year.
How do you file? You file online through the Ministry’s portal. You’ll upload your payroll summary and supporting documentation. The Ministry requires:
- Total remuneration paid to all Ontario employees (by month or quarter)
- Eligible deductions itemized (benefits, pension contributions)
- Taxable remuneration calculation
- Calculated EHT owing
- Payments already made during the year (quarterly or annual remittances)
- Balance owing or overpayment claim
How the Ministry Audits EHT Returns
T4 Slip Reconciliation: The Ministry cross-checks your EHT remuneration against T4 information from CRA. Discrepancies trigger contact from the Ministry.
Common Filing Mistakes and Audit Triggers
Mistake 1: Forgetting Associated Employers
You must combine payroll from all businesses you own for EHT purposes. Filing separate returns triggers reassessment, back taxes, penalties, and interest. Identify all entities you own or control and consult your accountant if unsure whether they’re “associated.”
Mistake 2: Miscalculating or Overstating Eligible Deductions
Mistake 3: Missing the Filing Deadline
Mistake 4: Failing to Register When Required
Mistake 5: Incorrectly Reporting Remuneration
Mistake 6: Mishandling Remote or Out-of-Province Employees
Documentation and Record-Keeping
The Ministry may request supporting documents during an audit. Keep these on file:
- Payroll registers showing gross wages, deductions, and net pay for each employee
- T4 summaries and individual T4 slips
- Benefit plan documents (insurance policies, pension plan statements, plan descriptions)
- Payroll software reports or accounting records
- Proof of remittances (bank statements, payment confirmations)
- Correspondence with the Ministry
A common audit trigger is misreporting associated employers or overstating eligible deductions. The Ministry has sophisticated matching systems that cross-reference your EHT return against T4 slips, corporate registries, and benefit plan filings. If your reported payroll doesn’t align with CRA records or if you claim deductions without supporting documentation, expect an audit. Accuracy and documentation prevent problems.
What Happens If You’re Audited
If the Ministry audits your EHT account, you’ll receive a notice requesting specific documents and information. Respond promptly and provide complete documentation. If the Ministry finds errors, you’ll receive a reassessment showing:
- Corrected taxable remuneration
- Recalculated EHT owing
- Back taxes owed
- Interest (calculated from the original due date)
- Penalties (if the error was due to negligence or misrepresentation)
If you discover an error on a past return, file an amended return immediately. Voluntary disclosure often results in waived or reduced penalties. Waiting for the Ministry to discover the error is riskier.
Frequently Asked Questions
How is employer health tax calculated in Ontario?
Employer health tax is calculated by applying the graduated tax rate to your annual taxable remuneration. First, determine your total payroll for the fiscal year (January 1 to December 31). Subtract the exemption threshold from your annual payroll. Apply the applicable tax rate (1.95% for most private sector employers) to the amount above the threshold. The result is your annual EHT liability, which you remit as required.
What is the current Ontario EHT exemption threshold for employers?
The Ontario EHT exemption threshold determines whether your business must pay. Employers with total payroll at or below the exemption threshold do not pay employer health tax. If your payroll exceeds the exemption threshold, you calculate tax only on the amount above this threshold. The exemption applies to the fiscal year, so you must track your annual payroll from January 1 to December 31 to determine eligibility.
Are there different EHT rates for private sector employers in Ontario?
Yes. Most private sector employers pay 1.95% on taxable remuneration above the exemption threshold. However, employers in specific industries or with certain designations may qualify for reduced rates. Your industry classification can determine your rate, so verify your sector to ensure accuracy in your calculations.
What should I include in taxable remuneration for EHT purposes?
Taxable remuneration includes gross wages, salaries, bonuses, taxable benefits, and taxable allowances paid to employees. It covers all forms of compensation subject to income tax withholding. Exclude payments to independent contractors, sole proprietors, and partners. Taxable benefits can count toward your total. Ensure you track all compensation accurately throughout the fiscal year to calculate your remuneration correctly.