Depletion
The tax deduction for using up natural resources — oil, gas, timber, minerals. Recover your investment as the earth delivers results.
A guide by Taxstra Tax & Accounting — CPA-led tax strategy for business owners
Quick Answer
Depletion on Schedule C (Line 12) is the tax deduction for using up natural resources — oil, gas, timber, minerals, gravel — that you own or have rights to extract. It works like depreciation but for the earth itself. There are two methods: cost depletion (based on your investment divided by estimated reserves) and percentage depletion (a fixed percentage of gross income, which can exceed your original cost basis over time).
Understanding Depletion
Depletion is to natural resources what depreciation is to equipment.
Depletion allows you to recover the cost of a natural asset as you physically use it up and sell it. Unlike depreciation, which spreads the cost of machinery over time based on wear and tear, depletion accounts for the literal removal of resources from your property. Every barrel of oil pumped, every cord of timber harvested, and every ton of gravel extracted represents a portion of your investment that you can deduct.
This is admittedly a niche deduction — most freelancers and small business owners will never use Line 12. But if you're in the business of extracting natural resources, understanding depletion can mean significant tax savings year after year. For landowners with timber, mineral rights holders receiving royalty checks, or anyone operating a quarry, this deduction directly reduces taxable income.
Who Uses This Deduction?
- Timber companies: Logging operations, tree farms, landowners selling timber rights or stumpage
- Mining operations: Coal mines, gravel pits, stone quarries, sand extraction, and aggregate producers
- Oil & Gas: Well operators, independent producers, and royalty interest holders receiving payments from production
- Mineral rights: Landowners receiving income from mineral extraction on their property
Two Methods of Calculating Depletion
Calculate both each year — take whichever is larger.
The IRS allows two different methods for calculating your depletion deduction. Each year, you should calculate both and use whichever gives you the larger deduction (though some limitations apply).
Cost Depletion
Based on the actual cost of the resource and how much you've extracted. Ties directly to your investment.
Formula:
(Units Sold ÷ Total Estimated Units) × Adjusted Basis = Depletion
Example: You bought mineral rights for $100,000. Geologists estimate 1 million barrels. Extract 50,000 barrels this year → cost depletion = $5,000.
Percentage Depletion
A fixed percentage of gross income from the resource. Key advantage: can exceed your cost basis over time.
Common Rates (verify current year):
- • Oil & Gas: 15%
- • Coal & Lignite: 10%
- • Gravel, Sand, Stone: 5%
- • Gold, Silver, Copper: 15%
Example: $80,000 gross oil income × 15% = $12,000 depletion, regardless of cost basis remaining.
Choosing Between Methods
Cost Depletion is typically better early in the property's life when you have a large basis relative to production, or when production is high but prices are low.
Percentage Depletion is typically better when you've already recovered most of your cost basis, when prices are high relative to your investment, or when you're a small producer who qualifies for the full percentage rate.
Important Limitations
50% Taxable Income Limit: Percentage depletion cannot exceed 50% of your taxable income from the property (before the depletion deduction).
1,000 Barrel/Day Limit (Oil & Gas): For oil and gas percentage depletion, there's a daily production limit. If you exceed 1,000 barrels of oil equivalent per day, you must use cost depletion for the excess.
Integrated Companies Excluded: Integrated oil and gas companies (those that refine and retail) cannot use percentage depletion — only independent producers and royalty owners qualify.
Worked Example
Timber owner comparing both methods side by side.
Timber Owner's Depletion Calculation
Given Information
- Property: 500 acres of timberland
- Estimated reserves: 2 million board feet
- Original basis: $300,000
- Board feet sold this year: 100,000 bf
- Gross income from sales: $50,000
- Percentage depletion rate: 10% (timber — verify current year)
Method Comparison
COST DEPLETION
($300,000 ÷ 2,000,000) × 100,000 = $15,000
PERCENTAGE DEPLETION
$50,000 × 10% = $5,000
Winner: Use Cost Depletion
Cost depletion of $15,000 is three times larger than percentage depletion. Deduct the larger amount and reduce your basis to $285,000 for next year.
Special Rules for Timber
Timber can qualify for long-term capital gains rates — a major advantage.
Unlike most natural resources, timber can potentially qualify for long-term capital gains treatment rather than ordinary income, significantly reducing your tax rate on profits.
Cutting as a Sale (Section 631(a))
If you've owned the timber for more than one year, you can elect to treat the cutting of timber as a sale. This converts what would be ordinary income into long-term capital gain, taxed at preferential rates (0%, 15%, or 20% depending on your bracket).
Outright Timber Sales (Section 631(b))
When you sell standing timber outright (stumpage), the gain is typically treated as a Section 1231 gain, which can qualify for capital gains treatment. Keep detailed records of your timber basis for accurate depletion calculations.
Advanced Oil & Gas Strategies
The IDC deduction is one of the most powerful in the entire tax code.
Oil and gas taxation is its own universe. Beyond depletion, arguably the most powerful deduction available is for Intangible Drilling Costs (IDCs).
The IDC Deduction
IDCs represent the labor, chemicals, mud, grease, and other non-salvageable costs of drilling a well. These can represent 60–80% of the total well cost. Unlike almost any other capital investment, you can often deduct 100% of IDCs in the year you invest — even if the well doesn't start producing until the following year.
Active Investors
If you own a working interest and are NOT a "passive investor" (via general partnership or direct ownership), you can use IDC deductions to offset your W-2 or business income immediately.
The "Working Interest" Exception
Working interests in oil & gas held directly or through an entity that doesn't limit liability (like a General Partnership) are exempt from Passive Loss Rules. This is one of the few ways high earners can use investment losses to lower active income tax.
Common Mistakes to Avoid
Confusing Depreciation and Depletion
Depreciation (Line 13) is for machines, buildings, vehicles, and equipment that wear out over time. The mining truck gets depreciated. The excavator gets depreciated.
Depletion (Line 12) is for natural resources that physically disappear as you sell them. The gravel that truck hauls gets depleted. They work together but are fundamentally different concepts.
Not Separating Land from Resource Value
When you purchase property containing natural resources, you must allocate your purchase price between the land (which cannot be depleted) and the resources (which can). Get an appraisal at purchase. Failing to make this allocation properly can result in understating your depletion deduction.
Using Depletion Without Actual Sales
You cannot claim depletion simply for owning land with natural resources. You must actually extract and sell the resource to claim the deduction. Inventory that's been extracted but not sold doesn't qualify until it's sold. The deduction follows the revenue.
Forgetting to Track Basis Year-Over-Year
Cost depletion reduces your basis each year. If you don't track this properly, you'll miscalculate future deductions. Keep a running ledger: original basis, annual depletion claimed, remaining basis.
Frequently Asked Questions
Related Topics
Extracting Natural Resources?
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Educational content only — not individualized tax advice. Verify all figures for the current tax year.