Fully depreciated assets still in use are one of the most common situations in business accounting, and the rules that apply to them are specific: the asset stays on your books at a zero net value, depreciation stops, but nothing else about your responsibilities does. You still owe property tax on it. You still need insurance. And if you sell it for even a dollar, every cent is taxable, most likely at ordinary income rates.
What Zero Book Value Actually Means
Once cumulative depreciation equals the asset’s original cost minus any salvage value you estimated, the IRS considers the basis fully recovered and depreciation stops.1Internal Revenue Service. Publication 946 – How To Depreciate Property The asset stays on your balance sheet at historical cost, offset dollar-for-dollar by accumulated depreciation. Net book value: zero.
That zero doesn’t mean the asset disappears from your records. Keep it listed. You need it for internal tracking, physical inventory counts, insurance documentation, and any future audit. Insurance carriers care about replacement cost, not book value, and dropping the asset from your records is an easy way to end up underinsured without noticing.
On the income statement, the effect is quieter but real. With no depreciation expense flowing through, reported net income ticks up compared to prior years when that non-cash charge was reducing it. It’s a timing effect, not a change in actual profitability, but period-over-period comparisons can mislead you if you’re not watching for it.
Why So Many Assets Hit Zero Long Before They Wear Out
Business owners are often surprised to see an asset that’s physically nowhere near retirement sitting at zero book value. The reason is usually accelerated depreciation.
Section 179 lets you expense up to $2,560,000 of qualifying equipment in the year you place it in service for tax years beginning in 2026.2Internal Revenue Service. Rev. Proc. 2025-32 A $200,000 machine can be fully expensed on your tax return the year you buy it, even if it will run reliably for another 15 years.
Bonus depreciation goes further. The One, Big, Beautiful Bill Act permanently restored 100% first-year bonus depreciation for qualifying property acquired after January 19, 2025.3Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill An asset’s entire cost can be written off in year one, meaning it can be brand new, fully operational, and already carrying a zero adjusted basis.
Repairs and Improvements While You Keep Using It
Money you spend keeping a fully depreciated asset running falls into one of two buckets, and the distinction decides whether you deduct the cost now or spread it over future years.
Routine Repairs and Maintenance
Ordinary upkeep that maintains the asset in its current operating condition is deductible in the year you pay for it. Replacing a worn belt, changing fluids, fixing a minor electrical fault — these reduce your taxable income immediately. The IRS also offers a de minimis safe harbor: if you have an applicable financial statement, you can expense items costing up to $5,000 per invoice; without one, the ceiling is $2,500 per invoice.4Internal Revenue Service. Tangible Property Final Regulations The election simplifies the repair-or-capitalize question for smaller expenditures.
Capital Improvements
An expenditure crosses from repair into capital improvement when it meets any one of three tests under the IRS tangible property regulations:4Internal Revenue Service. Tangible Property Final Regulations
- Betterment. The work materially increases the asset’s capacity, productivity, efficiency, strength, or quality, or fixes a defect that existed before you acquired the asset.
- Restoration. The work replaces a major component or substantial structural part, or returns a non-functional asset to operating condition.
- Adaptation. The work adapts the asset to a new or different use that’s inconsistent with your original intended use when you placed it in service.
Say you install a high-efficiency motor that boosts a machine’s output. That’s a betterment. The motor gets capitalized as a separate asset with its own depreciation schedule, even though the underlying machine is fully depreciated. The original machine stays at zero; the improvement starts its own recovery period alongside it.
What Happens Tax-Wise When You Sell
This is where owners get caught off guard. When your adjusted basis is zero, every dollar of the sale price is taxable gain. Sale price minus zero equals gain.
Under Section 1245, that gain is treated as ordinary income up to the total depreciation you previously claimed.5Office of the Law Revision Counsel. 26 USC 1245 – Gain From Dispositions of Certain Depreciable Property Because the asset is fully depreciated, the entire gain, up to the original cost, is recaptured as ordinary income. This applies to tangible personal property used in a trade or business: machinery, equipment, vehicles, computers, and similar assets.
Suppose you bought a machine for $50,000, fully depreciated it, and sell it now for $10,000. The entire $10,000 is ordinary income, taxed at your regular rate rather than the lower capital gains rate. That recaptured gain is added to your operating income for the year. If you sold the same machine for $60,000, more than the original cost, the first $50,000 would be ordinary income under Section 1245, and only the remaining $10,000 could qualify for capital gains treatment.
Scrap, Retirement, or Abandonment
If you junk a fully depreciated asset and receive nothing for it, there’s no gain and no loss. Book value is already zero, sale price is zero, and the math produces nothing. Remove the asset and its offsetting accumulated depreciation from your books. If you pay someone to haul it away or dismantle it, those disposal costs are deductible as a business expense.
A Boundary Note on Buildings
Buildings and structural components fall under Section 1250, not Section 1245, and the recapture math is meaningfully different.6Office of the Law Revision Counsel. 26 USC 1250 – Gain From Dispositions of Certain Depreciable Realty Because most commercial real property is depreciated straight-line, Section 1250 ordinary-income recapture rarely applies; instead, the depreciation you claimed is taxed as unrecaptured Section 1250 gain at a maximum rate of 25%. If your fully depreciated asset is a building rather than equipment, don’t apply the Section 1245 rules to it.
Reporting the Sale on Form 4797
When you sell or dispose of a Section 1245 asset, you report the transaction on IRS Form 4797. Depreciable personal property held longer than one year goes in Part III, with Section 1245 property specifically reported starting at Line 25.7Internal Revenue Service. Instructions for Form 4797 Property held one year or less goes in Part II. The form walks you through the recapture calculation, and the ordinary-income portion flows from Part III back through to your return.
The most common mistake is reporting the sale as a capital gain on Schedule D and skipping the recapture calculation entirely. If the asset was depreciable, it almost certainly belongs on Form 4797 first.
Costs and Obligations That Don’t Stop at Zero
A zero on the balance sheet changes nothing about your real-world obligations.
Property tax. If your jurisdiction imposes a business personal property tax, you owe it as long as you own the asset. These taxes are based on assessed fair market value or a statutory formula, not on accounting book value. A machine worth $30,000 on the open market generates property tax liability regardless of its depreciation status. Many states require an annual personal property tax filing, typically due in the spring.
Insurance. Liability coverage protects you against claims arising from the asset’s continued use, and property or casualty coverage ensures you can replace it if it’s destroyed. Both remain necessary as long as the asset is operational or stored on your premises. Letting coverage lapse because the asset “has no value on the books” is a mistake that looks small right up until a fire or an injury claim.
How Long to Keep the Records
The IRS requires you to keep records for depreciable property until the period of limitations expires for the tax year in which you dispose of it.8Internal Revenue Service. How Long Should I Keep Records In practice, hold onto the original purchase documentation, depreciation schedules, and improvement records for the entire time you own the asset, plus at least three years after you file the return reporting its disposal. If you underreported income by more than 25%, the limitations period extends to six years, so many tax professionals recommend keeping property records for seven years after disposition.
If you acquired the property in a tax-free exchange, keep the records from the property you gave up as well, since your basis carries over.8Internal Revenue Service. How Long Should I Keep Records Those records chain together, and losing the original acquisition documents can make it impossible to calculate your gain correctly when you eventually sell.