Oil depletion allowance
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The oil depletion allowance in American (US) tax law is an allowance claimable by anyone with an economic interest in a mineral deposit or standing timber.[1] The principle is that the asset is a capital investment that is a wasting asset, and therefore depreciation can reasonably be offset (effectively as a capital loss) against income.
The oil depletion allowance has been subject of interest, because of the relationship of big oil with the US government, and because one method (percentage depletion) of claiming the allowance makes it possible to write off more than the whole capital cost of the asset.[2]