The return builds on the accounts
The accounting records, prior returns, assessments and information about the corporation help establish the starting point. Accounting profit can need adjustments for tax. A bank export alone does not supply all the information a complete corporation return may require.
Ownership changes, related companies, shareholder transactions, equipment purchases and unusual events should be discussed, even if they did not pass through the main operating bank account.
Keep filing and payment dates separate
The CRA generally requires a corporation return within six months after its tax year ends. The balance of tax is generally due earlier, with the applicable payment date depending on the corporation's circumstances. Instalments can also arise during the year.
A company with an unfinished return may therefore need a tax estimate and payment discussion before the filing deadline. Waiting for a final document is not a substitute for checking the balance-due day.
What to ask before the work begins
Confirm which tax year is being prepared, what records remain outstanding and whether earlier filings or account balances need attention. Ask what is included in the engagement and whether GST/HST, payroll or the owner's personal return is a separate scope.
Keep the filed return and the resulting assessment. Compare the assessment with the filing and raise unexpected differences promptly rather than assuming the processing result is identical.
Sources & editorial notes
Sources checked October 23, 2026. The examples are illustrative and provide general information. Discuss how the guidance applies to your circumstances with your accountant.
- When to file your corporation income tax returnCanada Revenue Agency
- Corporate income tax payment due datesCanada Revenue Agency
Rules and guidance can change. Use the current official source and confirm the treatment for your facts. To flag an error, contact Sora.