If you’ve prepared a T2 corporate tax return, you may have heard about downloading a .COR file. Many accountants and business owners assume they need this file to submit their return to the Canada Revenue Agency.

The reality is simpler.

Modern corporate tax platforms like CloudTax allow you to prepare and submit your T2 return directly, without downloading or managing a .COR file.

Here’s what the .COR file is, why some users ask for it, and why it’s no longer necessary for most businesses.

A .COR file is the electronic transmission file created by corporate tax software when a T2 return is ready for electronic filing.

This file contains the data used for CRA Corporation Internet Filing, which sends the tax return to the Canada Revenue Agency.

Historically, the process looked like this:

The .COR file essentially acts as a technical package of the return data.

With CloudTax, the filing process is fully integrated.

Instead of downloading a transmission file and uploading it somewhere else, you can:

The platform handles the entire CRA transmission process automatically.

This eliminates the need to manage a .COR file entirely.

Direct submission through a modern platform simplifies the process and reduces errors.

You can submit the return in a single step without generating or transferring files.

There is no risk of:

Platforms like CloudTax validate the return before transmission to ensure it meets CRA electronic filing standards.

After filing, you receive confirmation that the Canada Revenue Agency has successfully received the return.

The direction of corporate tax software in Canada is clear: simplified, direct filing experiences.

Platforms like CloudTax remove unnecessary technical steps so businesses and accountants can focus on completing accurate returns rather than managing transmission files.

For most corporations, the simplest workflow is:

Prepare your return → review it → submit directly to the Canada Revenue Agency.

No .COR file required.