How to Calculate Amortization Accounting

Amortization is a financial accounting process that allocates the cost of a long-term asset over its useful life. This guide explains how to calculate amortization, including the formula, schedule, and key differences from depreciation.

What is Amortization?

Amortization is the systematic allocation of the cost of a tangible or intangible asset over its useful life. It's primarily used for financial reporting and tax purposes, particularly for assets like property, plant, and equipment (PP&E).

The main purposes of amortization are:

To spread the cost of an asset over its useful life
To match expenses with revenue
To provide a more accurate picture of a company's financial position
To comply with accounting standards and regulations

Amortization differs from depreciation, which is used for tax purposes. While both processes reduce the value of an asset over time, amortization is an accounting concept, whereas depreciation is a tax concept.

How to Calculate Amortization

Calculating amortization involves several steps. First, you need to determine the asset's cost, its salvage value (if any), and its useful life. Then, you calculate the annual amortization expense using the straight-line method or another appropriate method.

Step-by-Step Calculation

Determine the asset's initial cost
Estimate the asset's salvage value at the end of its useful life
Calculate the depreciable base (initial cost - salvage value)
Determine the asset's useful life in years
Divide the depreciable base by the useful life to get the annual amortization expense

Important Note

The salvage value is the estimated value of the asset at the end of its useful life. If the asset has no salvage value, this amount is zero.

Amortization Formula

The basic formula for calculating annual amortization expense is:

Amortization Expense Formula

Annual Amortization Expense = (Initial Cost - Salvage Value) / Useful Life

For example, if a company purchases a machine for $10,000 with an estimated salvage value of $1,000 and a useful life of 5 years, the annual amortization expense would be:

Example Calculation

Annual Amortization Expense = ($10,000 - $1,000) / 5 = $1,800

Amortization Schedule

An amortization schedule is a table that shows the allocation of an asset's cost over its useful life. It typically includes columns for the period, beginning book value, amortization expense, accumulated amortization, and ending book value.

Creating an Amortization Schedule

List each period (usually years)
Calculate the beginning book value for each period
Apply the annual amortization expense
Calculate accumulated amortization
Determine the ending book value

Here's a sample amortization schedule for our $10,000 machine example:

Year	Beginning Book Value	Amortization Expense	Accumulated Amortization	Ending Book Value
1	$10,000	$1,800	$1,800	$8,200
2	$8,200	$1,800	$3,600	$6,400
3	$6,400	$1,800	$5,400	$4,600
4	$4,600	$1,800	$7,200	$2,800
5	$2,800	$1,800	$9,000	$1,000

Amortization vs. Depreciation

While both amortization and depreciation reduce the value of an asset over time, they serve different purposes and are used in different contexts.

Aspect	Amortization	Depreciation
Purpose	Financial accounting	Tax accounting
Asset Types	Tangible and intangible assets	Tangible assets only
Calculation Methods	Straight-line, declining balance, etc.	Straight-line, declining balance, etc.
Accounting Impact	Reduces asset value on balance sheet	Reduces taxable income
Reporting	Income statement, balance sheet	Income statement

Companies must use both amortization and depreciation for assets that have both financial and tax implications. The difference between the two amounts is typically reported as deferred taxes.

FAQ

What is the difference between amortization and depreciation?

Amortization is used for accounting purposes to allocate the cost of intangible assets over their useful life, while depreciation is used for tax purposes to reduce the taxable value of tangible assets.

How often should amortization be calculated?

Amortization is typically calculated annually, but some companies may use monthly or quarterly periods for more precise reporting.

Can amortization be used for land?

No, land is not subject to amortization because it has an indefinite useful life. However, improvements to land can be amortized.

What happens when an asset's useful life is extended?

If an asset's useful life is extended, the annual amortization expense decreases, which may affect the company's financial statements.

Is amortization required for all assets?

Amortization is required for intangible assets and some tangible assets that have a finite useful life. Not all assets require amortization.