Accumulated depreciation is total depreciation recorded on an asset to date. Learn how it affects book value, tax basis, disposals, and California records.
Accumulated depreciation is the total depreciation recorded for a depreciable asset from the time it was placed in service through a particular reporting date. In bookkeeping, it is usually a contra-asset account: it has a credit balance that offsets the asset's original recorded cost on the balance sheet.
Accumulated depreciation does not hold cash, measure the asset's current market value, or represent only the current year's deduction. It is the cumulative total. Depreciation expense is the amount recognized for one reporting period.
A common presentation is:
Asset at cost − accumulated depreciation = net book value
Suppose Coastal Design LLC buys and installs a qualifying machine for $42,000. For its financial statements, it records $6,000 of straight-line depreciation each full year with no residual value in this simplified example.
| End of year | Asset cost | Annual depreciation | Accumulated depreciation | Net book value |
|---|---|---|---|---|
| 1 | $42,000 | $6,000 | $6,000 | $36,000 |
| 2 | $42,000 | $6,000 | $12,000 | $30,000 |
| 3 | $42,000 | $6,000 | $18,000 | $24,000 |
The asset account generally remains at $42,000 until disposal. Accumulated depreciation grows while the net book value shrinks. The machine might be worth more or less than $24,000 in the market.
For each $6,000 annual amount, the entry is generally:
Depreciation expense reduces the current period's income. Accumulated depreciation remains on the balance sheet and carries forward. Using separate accumulated-depreciation accounts for equipment, vehicles, buildings, and other categories makes the fixed-asset ledger easier to reconcile.
Financial books and tax returns can use different recovery periods, methods, conventions, elections, and placed-in-service rules. A business may expense qualifying property under Section 179 or bonus-depreciation provisions for federal tax while depreciating the same asset gradually in its financial statements.
That can produce at least three distinct measures:
These numbers should not be forced to agree. They should be reconciled. The tax fixed-asset schedule supports adjusted tax basis and future gain, loss, or recapture. The book schedule supports financial statements.
Assume the same $42,000 machine has $25,000 of total federal depreciation allowed or allowable by the sale date. Ignoring other adjustments, its federal adjusted basis is:
| Item | Amount |
|---|---|
| Original cost | $42,000 |
| Federal depreciation allowed or allowable | ($25,000) |
| Federal adjusted basis | $17,000 |
| Sale proceeds | $22,000 |
| Preliminary federal gain | $5,000 |
At disposal, the books generally remove both the asset's recorded cost and its related accumulated depreciation. They record proceeds and recognize book gain or loss based on net book value. Tax gain or loss is calculated separately using tax adjusted basis, selling costs, and applicable character and recapture rules.
Continuing the book example: if the machine's net book value is $24,000 and it sells for $22,000, the books generally show a $2,000 loss. If federal adjusted basis is $17,000, the federal return begins with a $5,000 gain instead. Neither calculation should be substituted for the other.
Fully depreciated property that remains in service normally stays on the books at cost with equal accumulated depreciation until disposal. "Fully depreciated" does not mean the asset disappeared or has no operational value.
Federal depreciation is commonly reported through Form 4562 and the return for the relevant activity. California does not conform to every federal accelerated-depreciation rule, including federal bonus depreciation, and has different Section 179 rules. California Form FTB 3885A or an entity-level depreciation schedule may track state adjustments.
Consequently, an asset can have the same original cost but different federal and California accumulated depreciation and adjusted basis. The difference can continue every year and affect the later disposition. Maintaining only the current federal deduction is not enough.
Maintain invoices, closing statements, installation costs, placed-in-service evidence, business-use records, asset descriptions and serial numbers, depreciation methods and lives, Section 179 and bonus elections, federal and California schedules, improvement records, disposal documents, trade-in information, and reconciliations to the general ledger and tax returns.
Heath Income Tax can help California businesses reconcile fixed assets, book depreciation, federal tax depreciation, and California adjustments before a return or asset disposition is reported.
Is accumulated depreciation a liability?
No. It is generally a contra-asset that offsets the related asset's cost on the balance sheet.
Can accumulated depreciation exceed the asset's depreciable basis?
Ordinarily it should not. An excess can signal duplicate entries, an incorrect life, failure to stop depreciation, or a schedule conversion problem.
Is land included?
Land is generally not depreciable. A real-estate purchase must be allocated between land and depreciable components.
Does accumulated depreciation reset each year?
No. Current depreciation expense resets with other temporary accounts, but accumulated depreciation carries forward until disposal or another proper adjustment.
The definitions and examples on this page are for informational purposes only and do not constitute tax advice. Tax laws change frequently and individual circumstances vary. Consult a qualified tax professional before making decisions based on this content.
Click a question or ask us your own.
Ask Us a Question
Message Sent!
Thank you — we'll get back to you as soon as possible.