Dr. Payne correctly calculated the depreciation expense for his dental practice assets using MACRS depreciation rates. He will also be able to claim depreciation deductions for the rental properties he converted his original residence and purchased condo into, using the fair market value of the residence as its basis since it was previously used for personal purposes. The document provides an overview of depreciation, amortization, and depletion deductions for business and rental property assets, and examples and rules for calculating MACRS depreciation using conventions like half-year and mid-quarter.