You can claim the Ontario tax credit for manufacturing and processing if the corporation had:
You cannot claim this credit on the corporation's income that is subject to the Ontario small business deduction rate.
File a completed Schedule 502, Ontario Tax Credit for Manufacturing and Processing, with your return.
For more information, see the schedule and section 33 of the Taxation Act, 2007 (Ontario).
On line 406 of Schedule 5, Tax Calculation Supplementary – Corporations, enter the amount of the credit you are claiming.