When I divorced I bought my-ex's half of the house. Now I am renting the house. Can I use the full value of the house to calculate depreciation?

Your basis will be made up of two parts since you purchased half at one price and the other half at a second. 

• 50% of the original purchase price,
• 50% share of the house.which is the amount you are paying your husband

When you covert a personal property to rental use, you take the lower of your adjusted basis or FMV at the date of conversion.