A wasting asset is any property with a limited lifespan that loses value over time until it is used up or becomes worthless. Land and publicly traded stock can hold or grow in value indefinitely; a patent, an oil well, a delivery truck, or a stock option cannot. That built-in expiration date is why the tax code gives you three separate ways to recover what you paid: depreciation for physical property, amortization for intangible rights, and depletion for natural resources. Which method applies depends on the type of asset, not on what you call it in your books.
What Counts as a Wasting Asset
Wasting assets fall into a few broad categories. The common thread is a finite useful life that ordinary upkeep cannot extend.
Tangible business property wears out through use. Manufacturing equipment, vehicles, computers, and office furniture all lose utility over time, which is what makes them depreciable in the first place.
Intangible rights expire by law. A patent grants exclusive rights for a term ending 20 years from the application filing date. Copyrights on works created after January 1, 1978, last for the author’s life plus 70 years. When the term ends, the exclusive right is gone.
Natural resources shrink with every unit extracted. Mineral deposits, oil and gas reserves, and standing timber are finite supplies, and each barrel pumped or ton mined reduces both the quantity remaining and the asset’s value.
Off-the-shelf computer software is treated as a wasting asset with a 36-month useful life under federal tax law, depreciated on a straight-line basis. Software acquired as part of a business purchase can instead fall under the Section 197 intangible rules.
Stock options and other derivatives are the classic wasting asset in finance. Every option has an expiration date, and its time value erodes a little more each day.
The distinguishing feature is irreversibility. You can repaint a building, but you cannot add years to a patent or put oil back in the ground.
Depreciation for Tangible Property
Physical business property is recovered through depreciation. The primary system is the Modified Accelerated Cost Recovery System (MACRS) under Internal Revenue Code Section 168.
MACRS assigns each type of asset a recovery period. Cars and light trucks get 5 years, office furniture gets 7 years, residential rental property gets 27.5 years. The system generally front-loads the deductions, so early years are larger and later years are smaller. To calculate a deduction you need three things: the asset’s cost basis, the date it was placed in service, and the applicable convention.
Most personal property uses the half-year convention, which treats the asset as placed in service at the midpoint of the year no matter the actual date. If more than 40% of your depreciable property for the year was placed in service in the last three months, you must use the mid-quarter convention instead. Depreciation is reported annually on IRS Form 4562.
Section 179 Expensing
Section 179 lets you deduct the full cost of qualifying equipment in the year of purchase rather than spreading it out. For 2026, the maximum deduction is $2,560,000, and it begins phasing out once total equipment purchases for the year exceed $4,090,000. The deduction cannot exceed the business’s taxable income for the year, so it works best for profitable businesses making targeted purchases.
Bonus Depreciation
Bonus depreciation is a separate first-year deduction that applies automatically to qualifying new and used property. Under the Tax Cuts and Jobs Act, 100% bonus depreciation was available through 2022 and then began phasing down by 20 percentage points per year. Recent legislation has amended the schedule, so the applicable 2026 rate depends on the current version of the law. Bonus depreciation has no dollar cap and can create a net operating loss, which distinguishes it from Section 179.
Amortization for Intangibles
Intangible wasting assets are recovered through amortization. Section 197 of the Internal Revenue Code covers most intangibles acquired as part of a business purchase, including patents, copyrights, trademarks, covenants not to compete, and goodwill. All are amortized on a straight-line basis over 15 years, regardless of actual useful life.
The 15-year rule produces some odd results. Buy a patent with 12 years of legal life left, and you still amortize it over 15 years. Buy goodwill that may hold value indefinitely, and you still amortize it over 15 years. Congress picked a uniform period to head off disputes over the true useful life of hard-to-value intangibles.
The Self-Created Intangible Exception
Section 197’s mandatory 15-year period applies to acquired intangibles. If you develop a patent, copyright, or similar asset yourself rather than buying it, the self-created intangible is generally excluded from Section 197. Instead, you recover the cost over the asset’s actual useful life under the general rules of Section 167. A self-created patent, for example, can be amortized over its remaining legal term rather than the statutory 15 years. The exception disappears if the intangible is created in connection with acquiring a trade or business.
Depletion for Natural Resources
Owners of mineral interests, oil and gas properties, and timber use depletion. Two methods are available, and you pick whichever produces the larger deduction each year.
Cost Depletion
Cost depletion is mechanical. Divide the property’s adjusted basis by the total estimated recoverable units (barrels of oil, tons of ore, board feet of timber) to get a per-unit rate. Multiply that rate by the units actually sold during the year. Total deductions over the life of the property can never exceed your original cost basis.
Percentage Depletion
Percentage depletion works differently. You deduct a fixed percentage of the gross income from the property each year. The percentage depends on the resource and ranges from 5% to 22% under Section 613. Sulfur and uranium sit at the top at 22%. Gold, silver, copper, and iron ore qualify for 15%. Coal and lignite get 10%. Gravel, sand, and common stone are at 5%.
The distinctive feature of percentage depletion is that total deductions can exceed your original cost basis. Over a long production life, you may deduct far more than you paid. That is a major reason productive extractive operations have historically low effective tax rates.
Options and Theta Decay
In financial markets, “wasting asset” most often refers to an options contract. Part of what you pay for an option is time value, the premium attributable to the possibility that the underlying stock moves favorably before expiration. Time value shrinks every day, a process traders call theta decay.
Theta decay is not linear. An option with six months until expiration loses time value slowly, but the erosion accelerates as expiration approaches, and in the final weeks the decline can be steep. Even a stock move in your favor can be swallowed by the shrinking time value. Sellers of options try to profit from the same dynamic in reverse: a contract they wrote is losing value as time passes.
The tax treatment at expiration is straightforward. If a purchased option expires worthless, the IRS treats the premium you paid as a capital loss, recognized in the year of expiration, with the holding period determining short-term or long-term. Options you write that expire generate short-term capital gain in the expiration year.
Wasting Assets Held in a Trust
If you are a trustee or a beneficiary rather than an owner, wasting assets create a distinct problem. The income beneficiary (often a surviving spouse or life tenant) wants maximum current cash flow. The remainder beneficiary wants the asset’s value preserved for eventual distribution. Pay out every dollar an oil well or patent license generates, and the asset is consumed while the remainder beneficiary inherits nothing. That is a breach of the trustee’s duty of impartiality.
The Uniform Principal and Income Act (UPIA) and its successor, the Uniform Fiduciary Income and Principal Act (UFIPA), set default rules for splitting receipts between income and principal. Under the 1997 UPIA, still in force in many states, royalties, bonuses, and working interest income from minerals or non-renewable water are allocated 90% to principal and 10% to income. Delay rentals and nominal annual lease payments go entirely to income. For illiquid wasting assets like patents, copyrights, and leaseholds, the default allocates 10% of receipts to income with the balance to principal.
The newer UFIPA directs the trustee to allocate natural resource receipts “equitably” between income and principal, and the allocation is presumed equitable if the amount sent to principal equals the IRS depletion deduction for that interest. That ties trust accounting directly to the tax treatment.
A trust instrument can override either default. Language explicitly directing that all net receipts from a specified wasting asset be treated as income will control. Without that language, the trustee must follow the statutory apportionment or face potential litigation from the remainder beneficiaries.
Penalties for Getting Cost Recovery Wrong
Misclassifying an asset is not just a bookkeeping issue. If an improper deduction substantially understates your tax, the IRS imposes a 20% accuracy-related penalty on the underpayment. For individuals, a substantial understatement means the reported tax was off by more than 10% of the correct tax or $5,000, whichever is greater.
Common triggers include using the wrong recovery period, running MACRS on property that should have been amortized straight-line, or failing to switch to the mid-quarter convention when more than 40% of annual purchases hit in the last quarter. The same 20% penalty applies to deductions disallowed for negligence or disregard of IRS rules, and it stacks on top of the tax owed plus interest. A misclassified wasting asset can get expensive fast.