CRA late-filing penalty vs late-payment interest: why filing alone is not enough

Separate the two questions

First ask whether the return was submitted on time. Then ask whether the required amount was paid on time. A successful filing acknowledgement answers the first question; it is not a bank or tax-account payment confirmation.

CRA's payment guidance explains that interest applies to most late personal and business tax payments, including required instalments. The relevant tax program determines the applicable interest and penalty rules. Avoid applying one flat rate or one penalty formula to every account.

Read the balance and period carefully

• Confirm which account and reporting period the charge concerns.
• Locate the filing acknowledgement.
• Locate payment references and check where payments were applied.
• Compare the notice with the account record.
• Ask the preparer to explain unresolved differences.

A payment made to an unexpected account or a filing rejected by software may need follow-up. Keep the issue open until the relevant evidence has been checked.

Do not assume one deadline covers everything

Corporate filing, balance and instalment dates can be different. Self-employed income-tax filing and payment dates can also differ. Use the guide for the relevant obligation and verify the account notice rather than copying another business's schedule.

Record completion separately

Compliance Calendar provides separate filing and payment progress with confirmation references. Use them to distinguish a submitted return from an unsettled balance. A reminder supports preparation; it does not calculate interest, pay tax or establish that CRA has accepted a payment arrangement.