Courts, she said, have found that, in some cases, people who spend less than half of the year in Canada are still residents for taxation purposes.
Even murkier is the status of the duke and duchess’s royal titles if they make Canada home. In 1919, Canada’s Parliament put an end to citizens and residents being able to accept noble titles from Britain with a resolution that was affirmed twice more, as recently as 1988.
Conrad M. Black, the former press baron, had to give up his Canadian citizenship to become Baron Black of Crossharbour. There is, however, no precedent for how the resolution, which some argue is of limited legal force, would apply to a member of the royal family moving to Canada.
In a country where there is sometimes grousing about the cost of security for the prime minister, the question of who will pay to protect Harry, Meghan and their son, Archie, has been widely raised. On Monday, Mr. Trudeau said that is one of many questions that remain to be resolved.
“We are obviously supportive of their reflections but have responsibilities in that as well,” he said, referring to security. “We’re not entirely sure what the final decisions will be.”
Currently, Canada covers the cost of the security provided to the couple by the Royal Canadian Mounted Police because Harry and Meghan’s official status in Britain makes them “internationally protected persons” under Canadian law. Kent Roach, a professor of law at the University of Toronto, said that after they withdraw from official life, Meghan and Harry will lose that status.
But citing news media estimates that their security cost will be about 2 million Canadian dollars, or about $1.5 million, a year, Mr. Roach anticipates that the government-funded guard will remain.