@galaxstar
I understand your concern about Canada.
However, and for reasons of general ease, I would still argue that Dec. 31st is a good cutoff point for all concerned.
For you changing to US stay 01/01/2024 through 12/09/2024 would mean
(a) W-2 is wrong and your employer has to issue a corrected W-2c or else you have to explain the error ( i.e. over-withholding for federal. State and possibly FICA taxes -- essentially you are reporting a W-2c). Your employer, depending on your salary may also have to correct books because of extra FICA contribution.
(b) your return will have to use Itemized deduction because you were not present in the USA for the full tax year ( may be ).
Filing or not filing 1040-c is not likely to impact your possible work visa next time nor any immigration actions. Your employer probably has already asked USCIS to can cancel your work visa .
That is IMHO
Is there more I can do for you ?
Of course it is your return, your money and your decision.
