The 15% Depletion Allowance: How Oil Investors Shelter Production Revenue

What Is Percentage Depletion?

Percentage depletion under IRC Section 613 lets independent producers and royalty owners deduct 15% of gross income from each oil and gas property, regardless of what they originally paid. It's a tax benefit that recognizes a simple fact: every barrel you pull out of the ground means there's less down there. The IRS compensates you for that physical depletion of the resource.

The key word is regardless. Unlike cost depletion (which stops once you recover your original investment), percentage depletion has no basis limit. A well that cost you $50,000 could generate $200,000 in total depletion deductions over its producing life. No other asset class offers this.

How the Math Works

Take a well generating $40,000 per year in gross revenue. Your percentage depletion deduction is $6,000 (15% × $40,000). That $6,000 of income is tax-free. Over a 20-year producing life, that's $120,000 in tax-sheltered income from a single well.

There are two limitations. First, depletion is capped at 65% of your net taxable income from all sources (unused amounts carry forward). Second, the 15% rate applies only to independent producers with average daily production of 1,000 barrels of oil or 6,000 MCF of natural gas or less. For individual investors in DPP programs, these limits are rarely an issue.

Percentage Depletion vs. Cost Depletion

Each year, you choose whichever method gives you the larger deduction. Cost depletion allocates your original investment across estimated recoverable reserves — as oil comes out, you deduct a proportionate share of your basis. Once you've recovered your full basis, cost depletion stops.

Percentage depletion almost always wins for individual investors because it's calculated on gross revenue, not your cost basis, and it never runs out. The only scenario where cost depletion is larger is in the first year or two of a high-cost well with very high production — and even then, percentage depletion quickly catches up.

How Depletion Compounds Over Time

Here's what makes depletion especially powerful for long-term investors. It runs for the entire producing life of the well. A well that produces for 25 years generates 25 years of depletion deductions. The amounts get smaller as production declines, but they never stop.

Combined with IDC deductions in year one and equipment depreciation in years 1-7, depletion creates a multi-layer tax shelter that continues well beyond the initial investment period. Many investors find that their cumulative tax deductions from a single well exceed their original investment within 8-12 years.

Who Qualifies

Independent producers and royalty owners qualify for percentage depletion. Major integrated oil companies (those with retail operations exceeding $5 million) do not. Working interest holders in DPP programs qualify as independent producers. The 1,000 BOE/day limit is aggregated across all your properties, but for most individual investors, this cap is academic.

The depletion allowance is one of the oldest provisions in the tax code, dating back to 1926. Congress has preserved it because it incentivizes continued domestic energy production — especially from smaller, independent operators like BassEXP.