Does a Canadian estate have any US tax reporting obligations if a beneficiary lives in the United States?

Generally, a beneficiary simply living in the United States and receiving an inheritance from an Ontario estate does not, by itself, create a US tax reporting obligation for the Canadian estate - US tax law is outside Ontario and Canadian law, and this is an area where cross-border advice matters rather than assumptions in either direction. A US-resident beneficiary may have their own US reporting considerations related to receiving a foreign inheritance, but that's generally a question for the beneficiary and their own US tax advisor, not an obligation that falls on the Canadian estate simply because of where the beneficiary lives.

Where things can get more complicated is if the estate itself has US connections beyond just a US-resident beneficiary, for example US-situs assets, a US-citizen beneficiary or executor, or other cross-border ties. Those situations can raise genuinely separate US filing questions that are outside the scope of Ontario estate law entirely.

Because US tax rules, thresholds, and forms are not something this content can responsibly summarize without risking inaccuracy, an estate trustee dealing with any US-connected beneficiary should involve a cross-border tax advisor early, rather than assume either that nothing needs to be reported or that something automatically does.