Ontario Personal Surtax Calculation

Ontario's personal surtax is an additional tax imposed on high-income earners. This calculator helps you determine how much surtax you owe based on your taxable income. Understanding the surtax calculation is crucial for proper tax planning and compliance.

What is Ontario Personal Surtax?

The Ontario Personal Surtax is an additional tax applied to taxable income exceeding $220,000 for individuals and $440,000 for couples. The surtax is designed to address income inequality by imposing higher taxes on those earning significantly more than the average Ontarian.

Key Facts

Introduced in 2019 as part of Ontario's Fairness Tax Plan
Applies to both residents and non-residents
Rate of 16% on income above the threshold
Does not apply to capital gains or business income

The surtax is progressive, meaning the higher your income, the more you pay in surtax. This creates a more equitable tax system by ensuring that those with higher incomes contribute a greater proportion of their earnings to public services.

How to Calculate Ontario Surtax

The calculation involves determining your taxable income and applying the surtax rate to any amount exceeding the threshold. Here's the step-by-step process:

Calculate your total taxable income
Subtract the Ontario surtax threshold ($220,000 for individuals, $440,000 for couples)
Multiply the result by 16% to get the surtax amount
Add the surtax to your regular Ontario tax liability

Formula

Surtax = (Taxable Income - Threshold) × 16%

Where Threshold is $220,000 for individuals and $440,000 for couples

It's important to note that the surtax is calculated after all other Ontario taxes and credits have been applied. The surtax is not refundable and must be paid in full with your regular tax return.

Ontario Tax Brackets

Before calculating the surtax, you need to determine your Ontario taxable income. This is calculated using the following progressive tax brackets:

Taxable Income	Marginal Rate
$0 - $45,142	5.05%
$45,142.01 - $90,287	9.15%
$90,287.01 - $109,350	11.16%
$109,350.01 - $127,450	12.16%
$127,450.01 - $150,000	13.16%
$150,000.01 - $220,000	14.16%
Over $220,000	16.00% (Surtax)

These rates are subject to change each year. Always verify the current tax brackets with the Canada Revenue Agency before filing your taxes.

Exemptions and Deductions

Several exemptions and deductions can reduce your taxable income and potentially lower your surtax liability:

Basic Personal Amount: $12,069 (2023)
Spouse or Common-Law Partner Amount: $12,069
Eligible Dependents Amount: $4,777 per dependent
Medical Expenses: Up to $3,654
RRSP Contributions: Up to $27,720
TFSA Contributions: No tax deduction but tax-free growth

Important Note

The surtax is applied to taxable income, not to your gross income. Therefore, any deductions or exemptions you claim will reduce your taxable income and potentially lower your surtax amount.

Worked Examples

Let's look at two examples to illustrate how the surtax calculation works.

Example 1: Single Filer with $250,000 Taxable Income

Taxable Income: $250,000
Subtract Threshold: $250,000 - $220,000 = $30,000
Calculate Surtax: $30,000 × 16% = $4,800

This individual would owe $4,800 in Ontario Personal Surtax.

Example 2: Couple Filing Jointly with $500,000 Taxable Income

Taxable Income: $500,000
Subtract Threshold: $500,000 - $440,000 = $60,000
Calculate Surtax: $60,000 × 16% = $9,600

This couple would owe $9,600 in Ontario Personal Surtax.

Frequently Asked Questions

Who is eligible for the Ontario Personal Surtax?: Individuals with taxable income over $220,000 and couples with taxable income over $440,000 are subject to the surtax.
Is the Ontario Personal Surtax refundable?: No, the surtax is not refundable. It must be paid in full with your regular tax return.
Does the surtax apply to all types of income?: No, the surtax applies only to taxable income from employment, self-employment, and other sources. It does not apply to capital gains or business income.
Can I reduce my surtax liability?: Yes, by claiming eligible deductions and exemptions, you can reduce your taxable income and potentially lower your surtax amount.
How often does the surtax threshold change?: The surtax threshold is adjusted annually based on inflation. It's important to verify the current threshold each year.