Depreciation

Depreciation is an accounting method that allocates the cost of a tangible asset over its useful life. Rather than recording the full purchase price as an expense in the year of acquisition, a business spreads that cost across multiple years to reflect the asset's gradual decline in value through use, wear, or obsolescence. It generally applies to long-term assets, such as equipment, vehicles, furniture, and buildings, that wear out, become obsolete, or lose value over time.

How depreciation works

Under standard depreciation rules, when a business purchases a long-term asset (machinery, a vehicle, or office equipment), the IRS does not allow the deduction of full cost in the year of purchase. Instead, the cost is deducted incrementally over the asset's designated recovery period.

Three common depreciation methods are in practice.

• Straight-line depreciation: This method spreads the cost of an asset evenly over its useful life. For example, if a company buys a piece of equipment for $10,000 with a useful life of 10 years, it would depreciate the asset by $1,000 annually.
• Declining-balance (accelerated) depreciation: This applies a higher deduction in early years and lower deductions later. The double declining balance method is a common variant.
• Modified Accelerated Cost Recovery System (MACRS): The IRS requires MACRS for most business assets in the United States. It assigns each asset class a fixed recovery period and depreciation percentage schedule.

Key characteristics

Depreciation is a non-cash expense, which means a business doesn’t pay money when it records depreciation. Instead, depreciation reduces the asset’s book value for financial reporting and may reduce taxable income on the business’s tax return.

Two provisions allow businesses to accelerate deductions beyond standard schedules:

• Section 179: Allows businesses to deduct the full cost of qualifying equipment or software in the year of purchase, up to an annual limit. The limit can change each year. 
• Bonus depreciation: Permits an additional 100% first-year deduction for qualified property acquired and placed in service after January 19, 2025.

Why depreciation matters

Depreciation reduces taxable income, lowering a business’s tax liability each year. As the deduction recurs over time, it provides an ongoing tax benefit rather than a one-time reduction.

It also produces more accurate financial statements. It spreads the cost of an asset over its useful life and aligns expenses with the revenue the asset generates, a principle known as the matching principle. Lenders and investors rely on accurate depreciation figures to assess the true value of a company’s assets.

Common examples

Depreciation applies across many asset types that businesses use in their operations. These examples show how the method works in practice for common purchases.

• Vehicles: A delivery van costing $40,000 depreciates over five years under MACRS rather than being fully expensed at purchase.
• Buildings: A business that purchases office space depreciates the structure (not the land) over 39 years for commercial property.
• Computers and technology: Laptops and servers are typically depreciated over five years.

Land and inventory are not depreciable. Depreciation applies only to long-term assets used in business operations.

Depreciation vs. amortization

Depreciation applies to tangible assets such as equipment, vehicles, and buildings. Amortization applies to intangible assets such as patents, trademarks, and goodwill. Both methods spread the cost of an asset over its useful life and reduce taxable income.

Related terms

• Business entity status: The type of legal entity affects how depreciation deductions flow through to owners for tax purposes.
• Dissolution: When a business closes, remaining assets have open depreciation schedules that require attention during the wind-down process.
• Withdrawal in business: Owner withdrawals and asset distributions can intersect with depreciation recapture rules.

FAQs about depreciation

What happens when a depreciated asset is sold before the end of its recovery period?

If a business sells or otherwise disposes of depreciated property before the end of its recovery period, the IRS may require depreciation recapture. This means some or all of the gain may be taxed as ordinary income up to the amount of depreciation previously allowed or allowable.

Can a business choose not to depreciate an asset?

No. A business that fails to claim allowable depreciation still has its asset’s cost basis reduced as if the deductions were taken. This forfeits the tax benefit while retaining the same future tax exposure.

What is the difference between book depreciation and tax depreciation?

Book depreciation is calculated for financial reporting under GAAP. It may use straight-line or another method. Tax depreciation follows IRS rules, typically MACRS, which often front-loads deductions more aggressively. The gap between the two creates a timing difference that appears on financial statements as a deferred tax liability or asset.