Most Canadians who move to the U.S. have a good understanding of their immigration residency status. However, many do struggle to determine their residency status for U.S. income tax purposes. While it is common knowledge that U.S. citizens and green card holders are responsible for filing U.S. tax returns, most people who move to the U.S. on a non-resident visa – such as a TN, E1 or E2, O-1, L-1 – are unfamiliar with the U.S. tax residency rules that can subject them to U.S. taxation on their worldwide income.