What tax credits are available for software companies in Ontario?

SR&ED: 35% tax credit for Canadian-controlled private corporations (CCPC) conducting research. Infographic explanation: techvibes.com.

OITC: 10% tax credit for SR&ED expenses (extra 10% on top of SR&ED for Ontario companies).

ORDTC: 4.5% non-refundable tax credit for SR&ED-eligible expenses.

OIDMTC: 40% credit for development & marketing "interactive digital media products".

ONTTI: 100% deduction for acquiring some types of IP from an "unrelated person".

CETC: 30% credit for hiring co-op students.

Ontario Tax Exemption for Commercialization: If your company was established a couple years ago and is commercializing IP from a university then you may be eligible for a ten year tax exemption.

Note: these are quick summaries of complicated government tax incentives. Please thoroughly read the eligibility criteria.