What it is:
How it works (Example):
There are two basic forms of depletion allowance, cost depletion and percentage depletion.
Cost depletion can be illustrated in this way:
An oil company invests $15 million in a property with an estimated oil reserve life of 15 years. The company deducts approximately $1,000,000 ($15 million/15 years) from taxable earnings each year until the initial investment is recouped in tax benefits.
The percentage method involves perpetually deducting a percentage from gross income earned, whereby more than the original cost can be recouped.
For example, a company might simply deduct 10% from gross income for as long as the property produces.
Why it Matters:
In the case of certain investments such as royalty trusts, depletion is accounted for in a portion of dividend payments that are treated as return of capital, which is not taxed directly but offset against the cost basis and paid as capital gains when the security is sold.