New Mandatory Tax Reporting Rules in Canada: A Comprehensive Overview

New Mandatory Tax Reporting Rules in Canada: A Comprehensive Overview

In recent years, the Canadian government has taken significant steps to enhance tax reporting requirements in order to detect and prevent inappropriate tax planning. These efforts have culminated in the introduction of new mandatory disclosure rules, which expand the existing reportable transaction rules and introduce new reporting obligations for notifiable transactions and reportable uncertain tax treatments. The legislation, known as the Budget Implementation Act, 2023, No. 1, was introduced in Parliament on April 20, 2023, as Bill C-47. This article provides a comprehensive overview of the final legislation, highlighting the key changes and implications for taxpayers.


The need for improved tax reporting requirements was identified by the Canadian government in the 2021 federal budget. The government recognized the challenges faced by tax authorities worldwide due to the lack of timely and comprehensive information on aggressive tax planning strategies. In response, the government proposed a consultation on more detailed reporting requirements for certain types of transactions. This consultation resulted in the development of the mandatory disclosure rules, which aim to provide the Canada Revenue Agency (CRA) with better visibility of transactions or tax reduction planning that may be considered aggressive in nature.

Reportable Transaction Rules

The reportable transaction rules are an essential component of the new mandatory disclosure regime. These rules require taxpayers, promoters, and advisors to provide detailed reporting on transactions that bear hallmarks indicative of tax-motivated activities. Previously, transactions were reportable if they met the definition of “avoidance transactions” and exhibited at least two out of three generic hallmarks related to contingent fees, confidential protection, and contractual protection. However, the revised reportable transaction rules make significant changes to the definition of “avoidance transaction” and the requirements for reporting.

Under the new rules, an avoidance transaction is defined as a transaction where one of the main purposes is to obtain a tax benefit. This broader definition captures a wider range of transactions, including routine tax planning activities. Additionally, the revised rules now require only one out of the three generic hallmarks to be present for a transaction or series to be reportable. This change reduces the reporting threshold and increases the number of transactions subject to disclosure.

The amendments to the reportable transaction rules also include changes to the contractual protection hallmark. Concerns were raised about the potential unintended application of this hallmark to arm’s length mergers and acquisitions (M&A) transactions where tax indemnities are part of the purchase arrangements. In response, the legislation now exempts certain indemnities and insurance in M&A transactions from triggering the contractual protection hallmark, provided they are obtained primarily for purposes other than achieving a tax benefit.

The revised rules also introduce a deadline of 90 days for filing the required information report, extended from the previous 45-day timeline. This change provides taxpayers and other relevant parties with more time to comply with their reporting obligations. Furthermore, the joint and several liability provision, which held all parties liable for penalties, has been eliminated. Each party now has an individual reporting obligation, and failure to report by one party does not discharge the reporting obligations of others.

Notifiable Transactions

In addition to the reportable transaction rules, the new mandatory disclosure regime introduces reporting requirements for notifiable transactions. Notifiable transactions are specific types of transactions designated by the Minister of National Revenue, with the concurrence of the Minister of Finance. These transactions are of interest to the government and may be indicative of potential tax avoidance.

A notifiable transaction is defined as a transaction that is the same as, or substantially similar to, a designated transaction. The legislation allows for an indicative list of transactions to be published by the government, providing guidance on the types of transactions that may be designated as notifiable. Transactions or series of transactions that are substantially similar to designated transactions are also considered notifiable. The legislation provides a broad interpretation of the term “substantially similar” to ensure comprehensive disclosure.

Similar to the reportable transaction rules, the notifiable transaction rules require each relevant party to file an information return within 90 days of entering into the transaction. However, the legislation provides a due diligence defense for taxpayers and persons entering into a transaction on behalf of a taxpayer. If these parties have exercised the degree of care, diligence, and skill that a reasonably prudent person would exercise in determining whether a transaction is notifiable, they are exempt from filing the information return.

Reportable Uncertain Tax Treatments

The final component of the new mandatory disclosure regime is the requirement for specified corporations to report reportable uncertain tax treatments. These treatments are tax positions recorded in a corporation’s audited financial statements that are uncertain in terms of their acceptance under tax law.

Under the legislation, a corporation is required to report a reportable uncertain tax treatment if it meets certain criteria. The corporation must have at least CA$50 million in assets at the end of the last financial year and must be required to file a Canadian income tax return for the current taxation year. The reporting of reportable uncertain tax treatments is done through a prescribed form, and the information must be reported at the time the corporation’s tax return is due.

Penalties and Consequences

Failure to comply with the new mandatory disclosure rules can result in significant penalties and adverse consequences. Non-compliance with the reporting requirements extends the normal reassessment period, allowing the CRA to reassess a taxpayer’s tax return at any time. Additionally, penalties may be imposed for failure to report reportable transactions, notifiable transactions, or reportable uncertain tax treatments.

The penalties for non-compliance vary depending on the type of disclosure and the nature of the violation. For reportable transactions, penalties can be as high as 25% of the tax benefit obtained from the transaction. Similarly, penalties for notifiable transactions and reportable uncertain tax treatments can also be significant. However, the legislation includes provisions that relieve penalties for taxpayers who exercise due diligence in determining their reporting obligations.

It is important for taxpayers and other relevant parties to understand and comply with the new mandatory disclosure rules to avoid penalties and ensure compliance with their reporting obligations.


The introduction of new mandatory disclosure rules in Canada represents a significant development in tax reporting requirements. The expanded reportable transaction rules, introduction of notifiable transactions, and reporting of uncertain tax treatments aim to provide the CRA with better visibility of potentially aggressive tax planning and ensure compliance with tax laws. It is crucial for taxpayers, promoters, and advisors to familiarize themselves with the new rules, understand their reporting obligations, and take steps to ensure compliance with the legislation. By doing so, taxpayers can avoid penalties and maintain compliance with Canada’s tax reporting requirements.