It is often said that, in a tax appeal, the Canada Revenue Agency is the client and the Department of Justice is its lawyer. As the client, the CRA gives instructions to Justice about how to conduct a tax case. Whether a case can be settled, it is thought, depends on the litigation officer from the CRA who is giving instructions to Justice. Indeed, Justice lawyers themselves often talk this way.
Garber v. The Queen, 2005 TCC 635, suggests that the situation is more complex than that.