Can a tax authority undo a transaction that followed the law?
That is what a general anti-avoidance rule is for. Each step can be legally effective and correctly reported, and an authority can still recharacterise the arrangement as a whole where its main purpose was the tax benefit and the result defeats the object of the provisions relied on. Compliance with the wording of each rule is therefore not the end of the analysis. The questions that decide the outcome are why the arrangement was carried out, what would have happened without the tax result, and what the record made at the time shows about both.
Does saving tax on its own mean the rule applies?
No. Almost every commercial decision has a tax consequence, and choosing the more efficient of two genuine routes is not what the rule addresses. The analysis generally asks three things in sequence: whether there is a tax benefit, whether the arrangement was undertaken primarily to obtain it rather than for a commercial reason, and whether the result frustrates the purpose of the provisions used. A file can concede the first, fail on the second, and never reach the third. Your record of the commercial reason is what answers the middle question.
Do Canada and the United States apply the same anti-avoidance test?
No, and a cross-border plan is exposed to both, along with any purpose provision in the treaty itself. The formulations differ in wording, in where the burden sits, and in the penalties and disclosure obligations that travel with them. A structure can survive scrutiny in one country and be recharacterised in the other, which is worse than failing in both: the two systems then describe the same arrangement differently, and relief becomes hard to claim anywhere. Both tests belong in the analysis before the first step is taken.
What records should I keep for a transaction with a tax advantage?
The record needs to show what was decided, by whom, when, and on what information. In practice that means board or shareholder minutes naming the commercial objective, the alternatives considered and the reason each was rejected, any external requirement that drove the timing, the valuations and advice relied on, and correspondence showing the commercial discussion running alongside the tax one. Documents made at the time carry the weight. A memorandum written after a query has arrived may be entirely accurate and will still read as an explanation constructed for the occasion.
Can a general anti-avoidance rule apply to a treaty benefit?
Treaty relief is not immune by virtue of being in a treaty. Depending on the treaty and the domestic law involved, a claim to a reduced withholding rate or to an exemption can be tested both by a purpose provision in the treaty and by the domestic general rule. The practical implication is that an arrangement whose only function is to route income through a country in order to reach a better treaty result is the case these rules were written for. The commercial reason for the recipient being in that country is the thing to evidence.
Should I worry about a structure a promoter sold us?
It is worth a separate look, for two reasons. Promoted arrangements tend to be built around the tax result, which is the feature the rule is aimed at, and the commercial reason is often supplied in the promoter material rather than in your own board records. Some jurisdictions also require disclosure of arrangements carrying particular hallmarks, and that obligation can fall on the participant rather than on the promoter. A review before the next step is cheaper than one after a query, and it can usually be done on the documents you already hold.
Which country do I pay tax to first?
Generally the source country — where the income arises — taxes first, often by withholding before you receive it. Your country of residence then taxes the same income and credits what the source country took. That order is why timing matters: a residence-country return filed before the source-country tax is settled has nothing to credit yet. Getting the sequence right is most of the work. See international tax planning.
Do I have to file in both countries?
Frequently yes, and the two filings do different jobs. The country where the income arises taxes it at source; the country where you are resident taxes your worldwide income and then gives credit for the tax already paid. Filing only one side is what leaves relief unclaimed — the credit has to be asked for on a return. We prepare both sides so the numbers agree. See dual filing.
