How to File Corporate Tax Returns in Ontario: A Step-by-Step Guide

If you have an incorporated business with a permanent establishment in Ontario, you are required to file an Ontario corporate tax return. Generally, business corporations must file their T2 corporate tax return with the Canada Revenue Agency (CRA) within six months after the corporation’s tax year ends. 

Here’s what you need to know to file a corporate tax return in Ontario and comply with federal and provincial tax laws.  

Eligibility Criteria for Filing a Corporate Tax Return in Ontario

The CRA does not require all business owners to file a T2 tax return. For example, sole proprietorships and partnerships are not required to file corporate income taxes in Ontario or across Canada. Business owners with sole proprietorships and partnerships can report business income when filing their personal income taxes. 

Incorporated Businesses

When filing corporate taxes, you need to identify the correct category for your business to claim eligible tax deductions and credits. The CRA classifies corporations into the following categories, all of which are required to file corporate tax returns:

• Canadian-controlled private corporation (CCPC)
• Other private corporation
• Public corporation
• Corporations controlled by a public corporation
• Other corporation

Most small business corporations operate as Canadian-controlled private corporations (CCPC) with no public shareholder ownerships. Canadian-Controlled Private Corporations are eligible to file corporate tax returns in Ontario. A private incorporated business operating as a CCPC is not controlled by non-Canadian residents or public companies. These private businesses can benefit from tax benefits, notably lower tax rates on the first $500,00 business income.

Permanent Establishment in Ontario

Corporations subject to the Ontario tax laws are required to have a permanent establishment in the province. A permanent establishment could be the physical presence of an office space, factory, or other forms of business premises. 

Required Documents and Information for Ontario Corporate Tax Filing

When filing your corporate tax return in Ontario, it is important to gather all the documents required to ensure your business complies with the provincial and federal tax laws. Documents and information you need for your business’s T2 tax return include an Ontario corporation number, the Ontario corporation’s tax account number, a federal business number, business financial statements, and GST/HST records.

• Ontario Corporation Number and Tax Account Number: When you incorporate your business in Ontario, the Ontario Ministry of Public and Business Service Delivery will issue an Ontario corporation number for your business to file a Corporations Information Act annual return. Generally, the Ontario Ministry of Public and Business Service Delivery will automatically generate and issue an Ontario corporation’s tax account number for your business.
• Federal Business Number: The Federal Business Number is a unique number you get when you either register your business through the Business Registration Online (BRO), incorporate a business federally, register for GST/HST or Payroll deductions, or incorporate your business with certain provinces, such as Alberta, British Columbia, Manitoba, New Brunswick, Nova Scotia, Ontario, Prince Edward Island, and Saskatchewan. You need a Federal Business Number to file your T2 Corporation Income Tax Return.
• Tax Year-Specific Documentation: Business information you need to file your taxes in Ontario includes complete financial statements showing revenue, business expenses, and taxes. You may also need to provide documentation to support any tax loss carry-forwards, tax loss carry-backwards, or tax credits and deductions.
• Payroll and GST/HST Records: You will need to provide documentation and information for employee payroll records and GST/HST filing records, where applicable.

Filing Methods for Ontario Corporate Tax Returns

Two common ways to file your Ontario corporate tax returns are through paper filing using the CT23 form or online through the Canada Revenue Agency.

• Paper Filing Using CT23 Forms: For earlier tax years before 2009, business corporations were required to file Ontario corporate tax returns using CT23 forms directly with the Ontario Ministry of Finance.
• Filing Through the CRA: For tax years ending on or after January 1, 2009, businesses can file their Ontario corporate tax returns through the CRA, including all Ontario-specific schedules. To file electronically and manage your corporate tax account, you’ll need to set up access to CRA My Business Account—our complete guide walks you through registration, features, and troubleshooting.

For most corporations, except insurance corporations, non-resident corporations, corporations filing in functional currency or corporations exempt from tax payable, the CRA requires an electronic T2 Corporation Income Tax Return for tax years starting after 2023.

Key Deadlines and Compliance Requirements

Businesses are required to meet T2 tax filing deadlines and comply with provincial and federal tax filing requirements. Failing to meet deadlines or comply with corporate tax filing can result in penalties and interest charges. 

Corporations are required to file their tax returns within six months after the end of the tax year. For example, for businesses with a tax year end on December 31, the tax return filing deadline is June 30 of the next year. Keep in mind that your T2 filing deadline and your tax payment deadline are not the same date — for a detailed breakdown of balance-due dates, CCPC extensions, and instalment schedules, see our guide to corporate tax deadlines in Canada. In addition to a corporate tax return, as of October 2021, corporations are required to file an annual return with the Ontario Business Registry, including updated beneficial ownership information and other corporate details.

Ensure that all tax filing and annual returns documents are kept for at least six years and that accurate records are maintained. 

For more details around this if you’re a small business owner, make sure to read this corporate year-end checklist for Canadian businesses right here.

Recent Updates and Changes in Ontario Corporate Tax Filing

Notable changes and updates to consider when filing your corporation’s tax return in Ontario are the mandatory filing requirement through the Ontario business registry starting in October 2021. 

Additionally, starting in the 2009 tax year, businesses are required to file harmonized corporate tax returns through the Canada Revenue Agency.

Common Mistakes to Avoid When Filing Corporate Taxes in Ontario

The corporate tax return filing process can be time-consuming, requiring documentation and reviews. It is important to pay attention to details to avoid common pitfalls when filing taxes. Common errors businesses make when filing their corporate tax returns in Ontario include inadequate bookkeeping, incorrect financial statements and business documentation.

Some corporations are unclear about their eligibility for tax filing in Ontario. Before filing your Ontario T2 taxes, ensure your business qualifies as a Canadian-controlled private corporation and has a permanent establishment in Ontario.

Avoid discrepancies in loss claims by reviewing calculations and tax forms when claiming losses in federal and provincial filings. Use the latest tax forms to ensure compliance with the Canada Revenue Agency.

It is also important to file your corporation taxes before the deadline to avoid additional business expenses, such as penalties and interest charges.

Additional Resources and Support

You can contact the CRA if you have questions on your corporate tax returns. The Ontario Ministry of Finance and Ontario Business Registry also provide detailed instructions on filing corporate and annual tax returns.

For accurate corporation tax filings and tax savings opportunities, consider working with an experienced bookkeeping and tax specialist to ensure you comply with tax laws and requirements. If you’re an incorporated Ontario business, our year-end packages for incorporated businesses bundle T2 preparation, financial statements, and CRA submission into one fixed-scope engagement.