Passive Foreign Investment Company (PFIC) filing requirements are one of the most complex tax matters on your personal tax return. Read the article below which lays out the US tax treatment of various items in Canada which do not exist under US tax law and often end up being PFICs and are taxable in the US. Click the link below for details.
https://www.theglobeandmail.com/globe-investor/personal-finance/taxes/us-citizens-living-in-canada-beware-these-five-tax-traps/article37658751/
https://www.theglobeandmail.com/globe-investor/personal-finance/taxes/us-citizens-living-in-canada-beware-these-five-tax-traps/article37658751/