When is my Ontario corporation’s T2 filing deadline?

The T2 corporate income tax return is due six months after your fiscal year-end under Income Tax Act s. 150(1)(a). Corporate tax owing is due earlier: two months after year-end for most corporations, or three months after year-end for a Canadian-controlled private corporation (CCPC) claiming the Small Business Deduction (ITA s. 157).

Two clocks. Filing clock: T2 return itself is due six months after fiscal year-end. Payment clock: balance owing is due two or three months after fiscal year-end. Missing the payment deadline triggers interest under ITA s. 161 at the prescribed rate, even if the return is filed on time.

Example: an Ontario CCPC with a March 31, 2026 fiscal year-end. Balance owing of $18,000 in federal corporate tax is due June 30, 2026 (three months after year-end, CCPC/SBD rule). The T2 return itself and any Ontario CT23 (integrated into the T2 for Ontario since 2009) are due September 30, 2026 (six months after year-end).

Late-filing penalty under s. 162(1) is 5% of unpaid tax plus 1% per complete month late (max 12 months). A repeat late-filer within three prior years triggers 10% plus 2% per month, max 20 months. A CCPC with a $50,000 tax bill that is 6 months late as a first offence pays $5,500 in penalty ($2,500 + $3,000) plus interest.

Note: Instalments are due monthly for large corporations or quarterly for eligible CCPCs (ITA s. 157(1.1)). Skipping instalments does not delay the T2 clock; both instalment interest and balance interest compound.

Source: canada.ca — T2 Corporation – Income Tax Guide

— Bader A. Chowdry, CPA, CA, LPA — Insight Accounting CPA

Disclaimer: Bader A. Chowdry, CPA, CA, LPA is a Licensed Public Accountant regulated by CPA Ontario. Insight Accounting CPA Professional Corporation is a Chartered Professional Accountant firm. This content is general information only and does not constitute professional advice for your specific facts. Confirm current rules and figures with your own advisor before acting.