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Ontario Tax Calculator 2018

Reviewed by Calculator Editorial Team

Calculate your Ontario provincial taxes for 2018 using this free tax calculator. This tool helps you estimate your tax liability based on your income and tax credits.

How to Use This Calculator

To calculate your Ontario taxes for 2018:

  1. Enter your total taxable income in the "Income" field.
  2. Select your filing status (Single, Married, or Other).
  3. Enter any applicable tax credits in the "Tax Credits" field.
  4. Click "Calculate" to see your estimated Ontario taxes.

The calculator will show your federal and provincial tax amounts, as well as your net tax liability after credits.

Ontario Tax Rates 2018

In 2018, Ontario had progressive tax rates that applied to both federal and provincial taxes. The tax brackets were as follows:

Tax Bracket Federal Rate Ontario Rate
Up to $12,071 15% 5.05%
$12,071.01 to $47,630 20.5% 9.15%
$47,630.01 to $95,259 26% 11.16%
$95,259.01 to $147,667 29% 12.16%
Over $147,667 33% 13.16%

Note: These rates are for 2018 only. Tax rates change annually and may differ for different filing statuses.

How Ontario Tax Calculation Works

The Ontario tax calculation process involves several steps:

  1. Determine taxable income: Subtract deductions and exemptions from your total income.
  2. Apply federal tax rates: Calculate federal taxes based on your taxable income.
  3. Apply Ontario tax rates: Calculate provincial taxes using Ontario's rates.
  4. Calculate total tax liability: Sum federal and provincial taxes.
  5. Apply tax credits: Subtract any applicable tax credits from your total tax liability.

Formula:

Net Tax Liability = (Federal Tax + Ontario Tax) - Tax Credits

The calculator uses these formulas to compute your taxes:

  • Federal Tax = Sum of (Taxable Income × Federal Rate for each bracket)
  • Ontario Tax = Sum of (Taxable Income × Ontario Rate for each bracket)

Worked Examples

Example 1: Single Filer with $50,000 Income

For a single filer with $50,000 taxable income and no tax credits:

  1. Federal Tax:
    • $12,071 × 15% = $1,810.65
    • ($50,000 - $12,071) × 20.5% = $7,507.17
    • Total Federal Tax = $1,810.65 + $7,507.17 = $9,317.82
  2. Ontario Tax:
    • $12,071 × 5.05% = $608.21
    • ($50,000 - $12,071) × 9.15% = $3,398.94
    • Total Ontario Tax = $608.21 + $3,398.94 = $4,007.15
  3. Total Tax Liability = $9,317.82 + $4,007.15 = $13,324.97

Example 2: Married Filer with $100,000 Income and $5,000 Tax Credits

For a married filer with $100,000 taxable income and $5,000 tax credits:

  1. Federal Tax:
    • $12,071 × 15% = $1,810.65
    • ($47,630 - $12,071) × 20.5% = $6,857.17
    • ($100,000 - $47,630) × 26% = $14,014.20
    • Total Federal Tax = $1,810.65 + $6,857.17 + $14,014.20 = $22,682.02
  2. Ontario Tax:
    • $12,071 × 5.05% = $608.21
    • ($47,630 - $12,071) × 9.15% = $3,149.94
    • ($100,000 - $47,630) × 11.16% = $6,191.84
    • Total Ontario Tax = $608.21 + $3,149.94 + $6,191.84 = $9,942.00
  3. Total Tax Liability = $22,682.02 + $9,942.00 = $32,624.02
  4. Net Tax Liability = $32,624.02 - $5,000 = $27,624.02

Frequently Asked Questions

What is included in taxable income?
Taxable income includes all income from employment, business, investments, and other sources minus deductions and exemptions.
Are tax credits different from deductions?
Yes, tax credits directly reduce your tax liability, while deductions reduce your taxable income.
How do I find my tax credits?
Tax credits can come from various sources including employment, government programs, and other tax-saving measures.
Is this calculator accurate for all Ontario residents?
This calculator provides estimates based on 2018 tax rates. For exact figures, consult a tax professional or use official government tax forms.