How to file the 2003 CT8 corporations tax return — and autofill 013-0231s with my-id.ca

Complete a 2003 CT8 return without retyping corporate details

Corporations filing the 2003 CT8 Corporations Tax Return repeat corporation name, business number, registered office address, and director details on every return package. This guide is an example of storing them once in my-id.ca.

Official form and source

Start from the official source and always use the current version — form numbers and links can change:

• Service page: Corporations tax — ontario.ca
• Form (Central Forms Repository): 2003 CT8 Corporations Tax Return / Guide — 013-0231s

What this form is about

Form 013-0231s is the 2003 CT8 Corporations Tax Return with guide — confirm whether your corporation must file CT8 on ontario.ca.

Before you start: what to gather

• Corporation legal name and Ontario corporation number.
• Registered office address and business number.
• Director names and addresses for the 2003 taxation year.
• Financial statements and CT8 tax particulars — prepare with your accountant.

Confirm the current process on ontario.ca.

How my-id.ca makes it faster

1. Save it once. Store your corporation name, address, and director details in your my-id.ca profile.
2. Keep documents ready. Upload supporting documents to my-id.ca Files so you are not searching at form time.
3. Autofill the form. Use the my-id.ca Chrome extension on a web form, or fill a PDF from your saved profile inside my-id.ca.
4. Review and submit yourself through the official channel.

Why do it in my-id.ca

Related Ontario forms repeat the same personal details. Captured once in my-id.ca — stored in Canada, with AI on its own servers — every form starts mostly complete.