I am a US citizen/Canadian Permanent Resident. I live/work in Canada, no US income in 2018. How do i ensure that I am not getting "double taxed" if I have to file both?

Investors and rental owners

There is a tax treaty between Canada & the US that helps prevent double taxation. This article has more details: https://turbotax.intuit.ca/tips/using-the-united-states-canada-income-tax-treaty-to-reduce-double-ta...