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Article 15 of the Protocol adds to the Convention a new Article XXVI A (Assistance in

U.S. Income Tax Treaty — Canada Technical Explanation - 1980 · 2026-10-03 edition · updated 2026-10-04 · United States

Collection). Collection assistance provisions are included in several other U.S. income tax treaties, including the recent treaty with the Netherlands, and in many U.S. estate tax treaties. U.S. negotiators initially raised with Canada the possibility of including collection assistance provisions in the Protocol, because the Internal Revenue Service has claims pending against persons in Canada that would be subject to collection under these provisions. However, the ultimate decision of the U.S. and Canadian negotiators to add the collection assistance article was attributable to the confluence of several unusual factors.

Of critical importance was the similarity between the laws of the United States and Canada. The Internal Revenue Service, the Justice Department, and other U.S. negotiators were reassured by the close similarity of the legal and procedural protections afforded by the Contracting States to their citizens and residents and by the fact that these protections apply to the tax collection procedures used by each State. In addition, the U.S. negotiators were confident, given their extensive experience in working with their Canadian counterparts, that the agreed procedures could be administered appropriately, effectively, and efficiently. Finally, given the close cooperation already developed between the United States and Canada in the exchange of tax information, the U.S. and Canadian negotiators concluded that the potential benefits to both countries of obtaining such assistance would be immediate and substantial and would far outweigh any cost involved.

Under paragraph 1 of Article XXVI A, each Contracting State agrees, subject to the exercise of its discretion and to the conditions explicitly provided later in the Article, to lend assistance and support to the other in the collection of revenue claims. The term "revenue claim" is defined in paragraph 1 to include all taxes referred to in paragraph 9 of the Article, as well as interest, costs, additions to such taxes, and civil penalties. Paragraph 9 provides that, notwithstanding the provisions of Article II (Taxes Covered) of the Convention, Article XXVI A shall apply to all categories of taxes collected by or on behalf of the Government of a Contracting State.

Paragraph 2 of the Article requires the Contracting State applying for collection assistance (the "applicant State") to certify that the revenue claim for which collection assistance is sought has been "finally determined." A revenue claim has been finally determined when the applicant State has the right under its internal law to collect the revenue claim and all administrative and judicial rights of the taxpayer to restrain collection in the applicant State have lapsed or been exhausted.

Paragraph 3 of the Article clarifies that the Contracting State from which assistance was requested (the "requested State") has discretion as to whether to accept a particular application for collection assistance. However, if the application for assistance is accepted, paragraph 3 requires that the requested State grant assistance under its existing procedures as though the claim were the requested State's own revenue claim finally determined under the laws of that State. This obligation under paragraph 3 is limited by paragraph 7 of the Article, which provides that, although generally treated as a revenue claim of the requested State, a claim for which collection assistance is granted shall not have any priority accorded to the revenue claims of the requested State.

Paragraph 4 of Article XXVI A provides that, when the United States accepts a request for assistance in collection, the claim will be treated by the United States as an assessment as of the time the application was received. Similarly, when Canada accepts a request, a revenue claim shall be treated as an amount payable under the Income Tax Act, the collection of which is not subject to any restriction.

Paragraph 5 of the Article provides that nothing in Article XXVI A shall be construed as creating in the requested State any rights of administrative or judicial review of the applicant State's finally determined revenue claim. Thus, when an application for collection assistance has been accepted, the substantive validity of the applicant State's revenue claim cannot be challenged in an action in the requested State. Paragraph 5 further provides, however, that if the applicant State's revenue claim ceases to be finally determined, the applicant State is obligated to withdraw promptly any request that had been based on that claim.

Paragraph 6 provides that, as a general rule, the requested State is to forward the entire amount collected to the competent authority of the applicant State. The ordinary costs incurred in providing collection assistance will normally be borne by the requested State and only extraordinary costs will be borne by the applicant State. The application of this paragraph, including rules specifying which collection costs are to be borne by each State and the time and manner of payment of the amounts collected, will be agreed upon by the competent authorities, as provided for in paragraph 11.

Paragraph 8 provides that no assistance is to be given under this Article for a claim in respect of an individual taxpayer, to the extent that the taxpayer can demonstrate that he was a citizen of the requested State during the taxable period to which the revenue claim relates. Similarly, in the case of a company, estate, or trust, no assistance is to be given to the extent that the entity can demonstrate that it derived its status as such under the laws in force in the requested State during the taxable period to which the claim relates.

Subparagraph (a) of paragraph 10 clarifies that Article XXVI A supplements the provisions of paragraph 4 of Article XXVI (Mutual Agreement Procedure). The Mutual Agreement Procedure paragraph, which is more common in U.S. tax treaties, provides for collection assistance in cases in which a Contracting State seeks assistance in reclaiming treaty benefits that have been granted to a person that is not entitled to those benefits. Subparagraph (b) of paragraph 10 makes clear that nothing in Article XXVI A can require a Contracting State to carry out administrative measures of a different nature from those used in the collection of its own taxes, or that would be contrary to its public policy (ordre public).

Paragraph 11 requires the competent authorities to agree upon the mode of application of Article XXVI A, including agreement to ensure comparable levels of assistance to each of the Contracting States.

Paragraph 3 of Article 21 of the Protocol allows collection assistance under Article XXVI A to be sought for revenue claims that have been finally determined at any time within the 10 years preceding the date on which the Protocol enters into force.

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