Deductions & credits

How do I handle the rental property depreciation ? 

This house is bought in 2010 and only converted to rental in Aug 2023.

In TT,  I selected "Residential rental real estate". Then it asks for "cost", "cost of land" and "date purchased or acquired".

 

For "date purchased or acquired", do I use the 2010 date  or   the July 2023 date..

I believe I can use the 2023 property tax bill for the "cost" and "cost of land".  Do I need to prorate this since rental starts from Auf 2023?