If you elect to have TurboTax do the splits, it will split Mortgage Interest and Property tax for you correctly between rental and Schedule A, if you enter them in the Rental section first. For other expenses, whatever amount you enter will get split. So you could enter whole-house insurance, utilities, etc. and they will be split. But for expenses that are just for the rental, whatever amount you enter will also be split.
The 'in service' date is the only date you need to worry about. If you state an 'in-service' date of 04/04/2024, for example, expenses are pro-rated for the year. It doesn't matter whether the house was not rented for periods, only that it was 'available for rent' during the period, so no worry about counting days actually rented. Be sure to say 'yes, it was rented all year' (which means from the 'in-service date).
@jasonsriche
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