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by guan 2468 days ago
For land producing minerals, there is a special tax rule called “percentage depletion” available to some taxpayers. With percentage depletion, the owner can deduct a fixed percentage (15%) of gross income every year. This can add up to more than the original amount invested in an oil field.

Normally, the depreciation allowance for capital investment over a period of years can only add up to the amount originally invested.