Summary

Robert H. Jackson Detroit Edison Company v. Commissioner of Internal Revenue…

A property may have a cost history quite different from its cost to the taxpayer. It may have been purchased for less or more than original cost, or built by contract which called for payments on which the builder profited greatly or suffered heavy loss. But generally and in this case the Commissioner was in no error in ruling that the taxpayer's outlay is the measure of his recoupment through depreciation accruals.
Source: Wikisource

Robert H. Jackson Detroit Edison Company v. Commissioner of Internal Revenue…

The amounts of the customers' payments are fixed by an estimate of the cost; they never exceed, and sometimes fall short of actual cost, but are not adjusted because of the difference between estimates and realization.
The Company constructs the facilities which become its property, and adds the full cost to its appropriate property accounts without deduction for the customer payment. It claims as a base for computing its depreciation the investment for which the Company is then reimbursed.
Source: Wikisource

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