Amortization vs. Depreciation: Key Differences

Last Updated: September 13th, 2023
Researched and Written by: Sydney Hoffman

Amortization writes off the cost of an intangible asset over its useful life, while depreciation tracks loss in value for tangible assets.

Depreciation and amortization are methods by which you can spread out the cost of an asset over time. These expenses can then be utilized as tax deductions to lessen your company’s tax liability.

Depreciation Meaning

Depreciation describes expensing a fixed asset over the span of its useful life. Physical assets include:

  • Buildings
  • Computers
  • Equipment
  • Machinery
  • Manufacturing Facilities
  • Office Furniture
  • Vehicles

As these assets operate and deteriorate over time, they experience a decline in value. Accordingly, depreciation expenses are recognized as deductions for tax purposes.

The annual depreciation expense you write off each year covers the majority of this loss with salvage value (or resale value) comprising the remainder. This residual value is not factored into the loss, since you can recoup these costs by reselling the resource or property.

Depreciation Methods

Amortization is always calculated using the straight-line method of depreciation. Depreciation, however, can be calculated using straight-line or accelerated methods. For tax purposes, your company can report higher expenses in the early years of an asset’s useful life.

The IRS outlines best practices on recovering the cost of business or income-producing property through deductions.

  • Straight-line depreciation
    The loss in value is distributed evenly through the asset’s useful lifespan.
  • Units of production
    Rather than calculating the value of the asset, you determine the number of units it will produce over its lifespan.
  • Declining balance
    Loss in value is distributed more aggressively early in the asset’s useful life; to calculate this, multiply the asset’s current book value by a fixed depreciation rate.
  • Double-declining balance
    In this accelerated method, the loss in value is distributed more heavily in the first year of ownership at twice the straight-line depreciation rate; this decelerates over time.
  • Sum of years digits
    An accelerated declining balance method that factors in the economic usefulness of an asset rather than the period for which it is used:

Depreciation Expense = (cost - salvage value) x # of years left in asset life /
sum of years in asset life

Track Depreciating Assets in QuickBooks
Track your assets and their depreciation in QuickBooks.

Amortization Meaning

Amortization describes the annual depreciation of an intangible asset over the span of its useful life. Intangible assets include:

  • Costs of issuing bonds to raise capital
  • Customer lists
  • Franchise agreements
  • Human capital
  • Lease rental agreements
  • Organizational costs
  • Patents
  • Trademarks
  • Trade names

You can calculate amortization using the straight-line depreciation method. This means that the annual amortization expense you write off each year remains fixed throughout the life of the asset.

The term “amortization” can also apply to concepts outside of accounting, for example utilizing an “amortization schedule” to calculate the principal and interest in a sequence of loan payments. Though these terms refer to two separate ideas, the process is essentially the same. A mortgage loan, for example, will diminish in carrying value as you pay off the balance.

Key Differences

Although both amortization and depreciation calculate the expenses associated with assets over time, there are some key differences between these accounting approaches:

Method Depreciation Amortization
Type of Asset Tangible Intangible
Residual Value Residual salvage value No salvage value
Formula (Tangible Asset - Salvage Value) / Useful Life (Cost of Intangible Asset) / Useful Life
Purpose Tracks diminishing value over time Allocates costs over time


Amortization and depreciation both track business assets but also share some other characteristics:

  • Recorded as non-cash expenditures on a statement of cash flow (i.e., there are no actual cash expenses made throughout the asset’s useful life)
  • Used to calculate the book value of an asset — or the original cost of an item minus accumulated depreciation/amortization
  • Documented as reductions in your company’s balance sheet under assets
  • Logged as expenses in your company’s income statement
  • Recorded as debits in journal entries (Note: Accumulated depreciation and amortization are logged as credits)


Depreciation Sample - Declining Balance Method

Your manufacturing facility makes a $50,000 purchase for a piece of equipment with a useful life of ten years. The salvage value at the end of its useful life is $5,000, with a depreciation rate of 20%.

Your yearly depreciation amount will be highest in the early years of your asset’s life. This method is ideal for assets like computers, cell phones, and vehicles that are quickly made obsolete by newer models.

Year Depreciation Equation Yearly Depreciation Amount End-of-Year Value
1 20% x $50,000 $10,000 $40,000
2 20% x $40,000 $8,000 $32,000
3 20% x $32,000 $6,400 $25,600
4 20% x $25,600 $5,120 $20,480
5 20% x $20,480 $4,096 $16,384
6 20% x $16,384 $3,277 $13,108
7 20% x $13,108 $2,621 $10,487
8 20% x $10,487 $2,097 $8,390
9 20% x $8,390 $1,678 $6,712
10 20% x $6,712 $1,342 $5,370

Amortization Sample - Straight-Line Depreciation Method

Your manufacturing facility secures a patent for $15,000 set to expire in five years. To calculate amortization, use the following formula:

Amortization formula: Purchase value / useful life
$15,000 / 5 = $3,000 annual amortization expense

Over the next five years, you will write off $3,000 each year to cover the cost of this patent.

Year 1 2 3 4 5
Opening Amortization $0 $3,000 $6,000 $9,000 $12,000
Addition $3,000 $3,000 $3,000 $3,000 $3,000
Cumulative Amortization $3,000 $6,000 $9,000 $12,000 $15,000


What are the different methods of amortization and depreciation?

Amortization is calculated using straight-line depreciation. Depreciation utilizes straight-line or accelerated methods.

When should I amortize or depreciate an asset?

Follow GAAP guidelines to determine which accounting method you should use. As a general rule, tangible assets are depreciated, and intangible assets are amortized.

Where are accumulated depreciation and amortization on a balance sheet?

Your company’s balance sheet will log these under the assets section.

Where are depreciation and amortization on an income statement?

Your company’s income statement will list depreciation and amortization in expenses.

Is there a faster way to calculate amortization and depreciation?

Accounting software allows you to accurately expense your business assets over their useful lifespans and generate financial statements. Regularly consult with your accountant to ensure you are accurately tracking depreciation.

Want to streamline your accounting methods? Find the best accounting software to help automate your financial processes. Or get free recommendations from one of our software advisors.

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