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Ontario - Provincial corporation tax

What's new for corporations

Basic rate

The Ontario basic income tax rate is 12%, effective July 1, 2010 (it was previously 14%). It will be reduced as follows:

  • 11.5% effective July 1, 2011;
  • 11% effective July 1, 2012; and
  • 10% effective July 1, 2013.

The tax is prorated based on the number of days in the year when the tax year straddles these dates.

Lower rate

The Ontario small business deduction reduces Ontario basic income tax by 8.5%, resulting in a lower tax rate of 5.5%. This tax rate was reduced to 4.5% effective July 1, 2010.

Reporting the tax

The harmonized return will include the following Ontario corporation taxes:

Transitional measures

The Ontario transitional tax debits and credits provide a transition from the Corporations Tax Act (Ontario) for corporations with different income tax attributes for federal and Ontario purposes.

Claiming the credits

Ontario offers different tax credits. Details of each credit can be found in the following pages and their associated schedules:

Other requirements

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