What is the depreciable basis? A B C D It is the cost of capital (both debt and equity) that can be depreciated and the cost spread over multiple years of the project. It is the cost of debt (interest) that can be depreciated and the cost spread over multiple years of the project. It is the fully installed cost of an asset that taxing authorities allow to be written off for tax purposes. It is the cost of all items expended prior to the decision to accept a project and are added to the cost of the asset and written off for tax purposes