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Ontario 2018 Tax Calculator

Reviewed by Calculator Editorial Team

Calculate your Ontario income tax for the 2018 tax year using this free tax calculator. Simply enter your taxable income and deductions to determine your estimated tax liability for the year.

How to Use This Calculator

Using this Ontario 2018 tax calculator is simple:

  1. Enter your total taxable income for the year in the "Taxable Income" field.
  2. If you have any deductions, enter them in the "Deductions" field.
  3. Click the "Calculate" button to see your estimated tax liability.
  4. Review the breakdown of your tax calculation.

The calculator will show you the total tax you owe based on Ontario's 2018 tax brackets. It also provides a breakdown of how much tax is paid at each marginal rate.

Formula Used

The Ontario 2018 tax calculator uses the following progressive tax rates:

Tax Calculation Formula

Tax = (Taxable Income - Deductions) × Tax Rate

Where Tax Rate is determined by the progressive tax brackets shown below.

The calculator applies the tax rates progressively, meaning each dollar of income is taxed at the highest applicable rate.

Worked Example

Let's calculate the tax for someone with $50,000 in taxable income and $5,000 in deductions:

  1. Taxable Income = $50,000
  2. Deductions = $5,000
  3. Taxable Income After Deductions = $45,000
  4. Tax Calculation:
    • $11,475 × 5.05% = $573.75
    • $22,950 × 9.15% = $2,086.25
    • $10,525 × 11.16% = $1,172.90
    • $9,950 × 12.16% = $1,209.58
  5. Total Tax = $573.75 + $2,086.25 + $1,172.90 + $1,209.58 = $4,942.48

This example shows how the progressive tax system works, with each portion of income taxed at different rates.

Ontario 2018 Tax Rates

Ontario's 2018 tax rates were progressive, meaning higher income levels were taxed at higher rates. Here are the tax brackets for the 2018 tax year:

Taxable Income Tax Rate
$0 - $11,475 5.05%
$11,475 - $44,914 9.15%
$44,914 - $89,822 11.16%
$89,822 - $150,000 12.16%
$150,000+ 13.16%

These rates were in effect for the 2018 tax year. Note that this calculator uses the 2018 rates, which may differ from current rates.

Frequently Asked Questions

What is the Ontario 2018 tax rate?
The Ontario 2018 tax rates were progressive, ranging from 5.05% for the first $11,475 to 13.16% for income over $150,000.
How do I use this tax calculator?
Enter your taxable income and any deductions, then click "Calculate" to see your estimated tax liability.
Does this calculator account for all Ontario taxes?
This calculator provides an estimate of provincial income tax. It does not include federal taxes, CPP, or EI contributions.
Are the 2018 tax rates still current?
No, these are the 2018 rates. For current tax rates, you would need to use a calculator for the current tax year.
What if I have a complex tax situation?
This calculator provides a basic estimate. For complex situations, consult a tax professional.