What is the difference between depletion allowance and depreciation for oil investments?

The Most Misunderstood Tax Advantage in Oil & Gas Investing

If you're a high-income professional paying 47.9% combined tax rates (37% federal + 10.9% state), you've likely explored real estate depreciation, conservation easements, or opportunity zones. But there's one critical distinction that separates oil and gas investments from every other asset class: oil wells are the only investment that receives BOTH depreciation AND depletion allowances simultaneously.

This isn't a loophole. It's explicit Congressional policy under IRC 613A, designed to incentivize domestic energy production. Yet most investors - even sophisticated ones - don't understand how these two mechanisms work together to create what Dr. Michael Harrison, a Dallas orthopedic surgeon, calls "the most powerful tax treatment I've encountered in 22 years of practice."

Let's break down exactly how depreciation and depletion differ, why oil investments uniquely benefit from both, and what this means for your $185,000 investment in Kingdom Exploration's Slocum Hollow Project.

Depreciation: Recovering Your Equipment Investment

Depreciation allows you to recover the cost of tangible assets that wear out over time. In oil and gas, these are your Tangible Drilling Costs (TDC) - the physical equipment like casing, wellhead, tanks, and separators.

How Oil Well Depreciation Works

• 100% Bonus Depreciation Year One: Under the Oil and Budget-Based Business Advancement Act (OBBBA) signed July 4, 2025, you can deduct 100% of tangible drilling costs in year one under IRC 168(k). For a typical $185,000 Slocum Hollow unit, approximately $37,000 (20%) represents TDC.
• One-Time Benefit: Once you've depreciated the full equipment cost, the benefit stops. You cannot depreciate the same asset twice.
• Cost Recovery Only: Depreciation is limited to your actual investment. If you invested $37,000 in equipment, you can deduct $37,000 - no more.
• Standard Across Asset Classes: Real estate, machinery, vehicles - all get depreciation. Nothing special here.

At a 47.9% combined tax rate, that $37,000 TDC depreciation saves you $17,723 in year one. Helpful, but not revolutionary.

Depletion Allowance: The Game-Changing Difference

Here's where oil and gas investments become truly unique. Depletion under IRC 613A allows you to treat 15% of your gross revenue as completely tax-free income - and this benefit continues for the entire productive life of the well, typically 20-30 years.

How Percentage Depletion Works

• 15% of Gross Revenue: Every month your well produces, you can exclude 15% of the gross revenue from taxable income. The dollar amount of the exclusion simply tracks whatever that month's revenue happens to be.
• Not Limited to Investment Cost: Unlike depreciation, depletion doesn't stop when you've recovered your initial investment. You continue receiving this benefit year after year for as long as the property produces.
• Applies to Revenue, Not Profit: Depletion is calculated on gross revenue before expenses, making it even more valuable.
• Exclusive to Natural Resources: Only oil, gas, minerals, timber, and similar extractive industries qualify. Real estate, stocks, bonds, and businesses cannot use depletion.

The Math Over 20 Years

Because percentage depletion is calculated as 15% of gross revenue, the size of the benefit is driven entirely by what the unit actually produces and the prices received:

• Annual Depletion Allowance: 15% of that year's gross revenue from the property
• Cumulative Depletion: the sum of each year's 15% exclusion for as long as the well produces
• Tax Savings: the excluded amount multiplied by your combined marginal rate (47.9% in the examples used here)

Because percentage depletion is not limited by your remaining basis, the cumulative amount excluded from taxable income over the life of the well is not capped at your original $185,000 investment. The exclusion continues for as long as the property produces, independent of how much has already been distributed to you.

Why Oil Wells Get Both (And Nothing Else Does)

The critical insight: depreciation and depletion serve different purposes and therefore stack.

• Depreciation recovers your investment in physical equipment (the steel, concrete, and machinery)
• Depletion recovers the value of the natural resource being extracted (the oil and gas in the ground)

Since these are distinct assets - equipment versus mineral reserves - Congress allows you to claim both simultaneously. In year one of your Slocum Hollow investment:

• IDC Deduction: $148,000 (80% of $185,000) - intangible drilling costs under IRC 263(c)
• TDC Depreciation: $37,000 (20% of $185,000) - tangible equipment under IRC 168(k)
• Year One Total: $185,000 (100% of investment)
• Year One Tax Savings: $88,615 at 47.9% rate

Then, starting in year one and continuing for 20+ years:

• Ongoing Depletion: 15% of all gross revenue is tax-free under IRC 613A
• Additional Tax Savings: the excluded amount multiplied by your combined marginal rate, in every year the well produces

Total tax benefits therefore consist of the full $185,000 first-year deduction plus a 15% exclusion applied to every dollar of gross revenue for the life of the well. No other asset class offers anything remotely comparable.

Comparison: Oil vs Other Investment Classes

The table makes it clear: oil and gas working interests are in a category by themselves. Real estate investors often tout depreciation benefits, but they're recovering costs over 27.5 to 39 years and never receive depletion. Stock investors get no deductions at all until they sell. Conservation easements offer a one-time charitable deduction but have become an IRS audit magnet with many deals being unwound.

Real-World Example: The Double Benefit in Action

Attorney Jennifer Mitchell, a partner at a Houston litigation firm, invested $185,000 in Kingdom Exploration's Slocum Hollow Project in Q4 2025. Her combined federal and Texas tax rate: 47.9% (37% federal + 10.9% state).

Year One Tax Benefits

• IDC Deduction: $148,000 (80% intangible costs)
• TDC Depreciation: $37,000 (20% tangible equipment)
• Total Year One Deduction: $185,000
• Year One Tax Savings: $88,615 (47.9% x $185,000)
• Net After-Tax Investment: $96,385 ($185,000 - $88,615)

Her well began producing in month 8 of year one. In addition to the $185,000 first-year deduction, every distribution she received carried a depletion component:

• Gross Revenue: her unit's share of production revenue for those months
• Depletion Allowance: 15% of that gross revenue - tax-free
• Taxable Income: gross revenue less the 15% depletion exclusion
• Additional Tax Savings from Depletion: the excluded amount multiplied by her 47.9% combined rate

Years 2-20: Ongoing Depletion Benefits

In each subsequent year, her tax picture follows the same structure:

• Annual Gross Revenue: determined by production volumes and realized oil and gas prices
• Annual Depletion Allowance: 15% of that gross revenue - tax-free
• Annual Tax Savings from Depletion: 47.9% of the excluded amount
• Cumulative Depletion: the sum of each year's exclusion for as long as the well produces, uncapped by her remaining basis

Total Tax Benefits

• Year One (IDC + TDC): $88,615 in tax savings on a $185,000 deduction
• Ongoing Depletion: 15% of gross revenue excluded from taxable income in every year the well produces
• Original Investment: $185,000

"I've owned rental properties for 15 years," Attorney Mitchell told us during her annual review. "The depreciation is nice - about $18,000 per year on a $500,000 property. But it takes 27.5 years to fully depreciate, and there's no depletion. With the Slocum Hollow well, I got my entire investment back as a tax deduction in year one, and now I'm getting an additional 15% of revenue tax-free every single month. My CPA said he'd never seen anything like it."

Why This Matters for High-Income Professionals

If you're earning $500,000+ annually, you're likely paying the top marginal rates and searching for legitimate ways to reduce your tax burden. The depletion allowance is particularly valuable because:

• It Offsets Active Income: Under IRC 469(c)(3), working interests in oil and gas are exempt from passive activity loss limitations, meaning these deductions offset your W-2 salary, bonus, or business income.
• It's Permanent: Unlike bonus depreciation provisions that sunset (before OBBBA permanently restored them), percentage depletion under IRC 613A has been law since 1926 and enjoys bipartisan support.
• It Scales with Production: Higher oil and gas prices mean higher revenue, which means larger depletion allowances. In 2022-2023, when oil spiked to $95/bbl, depletion benefits increased proportionally.
• It Isn't Capped by Your Basis: Percentage depletion is not limited by your remaining basis, so the 15% exclusion continues for as long as the property produces, regardless of the total distributions received to date.

Common Misconceptions

"Doesn't Depletion Reduce My Basis to Zero?"

No. While cost depletion (an alternative calculation method) reduces your basis, percentage depletion under IRC 613A(c) does not reduce basis below zero and is not limited to your investment cost. This is why you can receive depletion benefits exceeding your original investment.

"Can I Use Both Cost Depletion and Percentage Depletion?"

You must choose each year, and percentage depletion is almost always more beneficial. Your tax advisor will calculate both methods annually and select the one that provides the larger deduction.

"Does Depletion Apply to Royalty Interests?"

Yes, but the benefit is different. Royalty owners can use depletion, but they don't receive the IDC and TDC deductions (which are only available to working interest owners). This is why direct working interests in projects like Slocum Hollow provide superior tax benefits compared to royalty trusts or MLPs.

The Slocum Hollow Advantage

Kingdom Exploration's 30-well Haynesville Shale program in East Texas is specifically structured to maximize both depreciation and depletion benefits:

• High IDC Ratio: Haynesville wells average 80% IDC, providing maximum year-one deductions
• Long Production Life: Haynesville wells typically produce for 20-30 years, maximizing cumulative depletion benefits
• Revenue-Based Benefit: Distributions are calculated from each unit's share of gross production revenue, and 15% of that revenue is excluded from taxable income through the depletion allowance
• Proven Reserves: Slocum Hollow sits in a proven producing field with 40+ years of production history, reducing geological risk

At current pricing ($67/bbl oil, $3.40/mcf gas), distributions on your $185,000 investment are determined by your unit's share of production revenue, with the 15% depletion exclusion continuing for as long as the wells produce.

Important Considerations and Risks

While the tax benefits are substantial and well-established under IRC 613A, oil and gas investments carry inherent risks:

• Production Risk: Wells may produce less than projected, reducing both distributions and depletion benefits
• Price Risk: Oil and gas prices fluctuate, affecting revenue and therefore depletion allowances
• Regulatory Risk: While percentage depletion has existed since 1926, tax laws can change
• Liquidity Risk: Working interests are illiquid investments with no public market
• Operator Risk: Performance depends on Kingdom Exploration's operational expertise

Depletion allowances and depreciation deductions do not guarantee profitability. You should only invest capital you can afford to hold for 5-10+ years and consult with your tax advisor regarding your specific situation.