@mokomoko
(a) the best US tax option would be for you to stay in Canada at least a full year or more . I say this because if you keep your residency then you possibly can have "foreign tax home and be able to exclude Candain income from US taxes ( Only be taxed by Canada ) This depends on the kind of accommodation with your employer.
(b) Yes you can give up your H-1B visa when you leave US and thereby be a dual status ---- By leaving in July of 2024 you would have met the SPT --- be taxed on world income during the "present " period. For the rest of the year you are Non-Resident ( not physically present -- NRA ) and be taxed ONLY on US sourced income.
Note that SPT is on an annual basis ( but in fact if you were a resident for the year before , you wil very easily meet the SPT for the current year ).
Is there more I can do for you ?
