Journal Entries for Amortization

Quick Answer: Amortization is the systematic allocation of an intangible asset's cost over its useful life. The journal entry debits Amortization Expense and credits Accumulated Amortization (or the intangible asset directly). For loan amortization, each payment splits between Interest Expense and Loan Payable principal reduction.

Amortization serves two distinct purposes in accounting: the write-down of intangible assets over their useful lives, and the gradual repayment of loan principal over time. Both concepts share the same name but involve different journal entries. This guide covers both types in detail, with clear examples for each scenario.

Amortization of Intangible Assets

Intangible assets — such as patents, copyrights, trademarks, software licenses, and customer lists — provide economic benefits over multiple periods. Rather than expensing the entire cost upfront, amortization spreads the cost over the asset's useful life, matching the expense to the revenue it helps generate.

Under US GAAP (ASC 350), intangible assets with finite useful lives are amortized. Intangible assets with indefinite useful lives (such as certain trademarks or goodwill) are not amortized but are tested for impairment annually. Under IFRS (IAS 38), the approach is similar, with some differences in revaluation rules.

Example: Amortizing a Patent

Suppose your company acquires a patent for $60,000 with a legal life of 20 years and an estimated useful life of 10 years. The annual amortization using the straight-line method is $6,000 per year ($60,000 / 10 years), or $500 per month.

Monthly journal entry:

Note: Some companies credit the intangible asset account directly rather than using a contra-asset account. Both approaches are acceptable, but the contra-asset method (Accumulated Amortization) is preferred because it preserves the original cost on the balance sheet.

Example: Amortizing Software License

Your company purchases a 3-year software license for $36,000. The monthly amortization is $1,000 ($36,000 / 36 months).

This is similar in structure to how you would record depreciation on tangible assets, but the terminology and account names differ.

Amortization Methods

The straight-line method is the most common approach for intangible asset amortization, but other methods are permitted when the pattern of economic benefits supports them.

Straight-Line Method

Annual amortization = Cost / Useful Life. This is the default method under both US GAAP and IFRS unless another method better reflects the asset's consumption pattern.

Units-of-Production Method

If an intangible asset's benefit is tied to output (e.g., a patent used to produce a specific product), amortization can be based on actual production relative to total estimated output.

Amortization per unit = Cost / Total estimated units. Periodic amortization = Units produced in period × Amortization per unit.

Accelerated Methods

While less common for intangibles, accelerated amortization may be appropriate when the economic benefits decline over time. Under US GAAP, accelerated methods are permitted if they better reflect the consumption pattern. IFRS requires the method that most faithfully represents the expected consumption of economic benefits.

Loan Amortization Journal Entries

Loan amortization refers to the process of paying off a loan through scheduled payments that cover both interest and principal. Each payment reduces the outstanding balance, and the portion allocated to principal increases over time while the interest portion decreases.

Example: Monthly Loan Payment

Your company has a $100,000 term loan at 6% annual interest with monthly payments of $1,933. In the first month, $500 goes to interest and $1,433 reduces the principal.

This entry demonstrates the two components of every amortizing loan payment. For a comprehensive treatment of interest costs, see our guide to journal entries for interest expense.

Amortization Schedule Illustration

Here is how the payment allocation shifts over the first six months of the same loan:

Month	Payment	Interest	Principal	Remaining Balance
1	$1,933	$500	$1,433	$98,567
2	$1,933	$493	$1,440	$97,127
3	$1,933	$486	$1,447	$95,680
4	$1,933	$478	$1,455	$94,225
5	$1,933	$471	$1,462	$92,763
6	$1,933	$464	$1,469	$91,294

As the table shows, the interest portion decreases each month as the principal balance declines. This is the hallmark of an amortizing loan.

Amortization of Deferred Financing Costs

When a business obtains a loan, it often incurs financing costs such as origination fees, legal fees, and commitment fees. Under US GAAP, these costs are capitalized as a deferred asset and amortized over the loan term using the effective interest method (or straight-line if the results are not materially different).

Example: Amortizing Loan Origination Fees

Your company pays $4,000 in loan origination fees on a 5-year term loan. The annual amortization is $800 per year.

Amortization of Prepaid Expenses

Prepaid expenses such as insurance premiums and rent are amortized as the benefit is consumed. While accountants often use the term "amortization" for this process, the journal entries are technically expense recognition entries. For detailed guidance, see our article on journal entries for prepaid expenses.

Example: Amortizing Prepaid Insurance

You pay $12,000 for a 12-month insurance policy. Each month:

This follows the same pattern as journal entries for insurance premiums, where the initial payment is capitalized and then recognized over the coverage period.

Impairment of Amortizable Intangible Assets

If an intangible asset's recoverable amount falls below its carrying value, an impairment loss must be recognized. This can happen due to legal challenges to a patent, market changes reducing a trademark's value, or technological obsolescence of software.

Example: Patent Impairment

A patent with a carrying value of $35,000 is determined to have a recoverable value of only $20,000 due to a competing technology.

After impairment, the patent's new carrying value is $20,000, and future amortization is calculated on this revised amount over the remaining useful life. This is analogous to the treatment for accrued expenses where an estimate must be revised when new information becomes available.

Key Differences: Amortization vs. Depreciation

Feature	Amortization	Depreciation
Asset type	Intangible assets	Tangible fixed assets
Salvage value	Generally zero	Often has residual value
Default method	Straight-line	Varies (straight-line, declining balance, units-of-production)
Contra account	Accumulated Amortization	Accumulated Depreciation
Impairment testing	Required for finite-life and indefinite-life intangibles	Required when indicators exist (GAAP); annually (IAS 36)

Common Mistakes in Amortization Accounting

• Amortizing goodwill: Under both US GAAP and IFRS, goodwill is not amortized. It is tested for impairment annually instead.
• Ignoring residual value: While most intangibles have zero residual value, some (like a patent that can be sold at the end of its useful life) may have a residual value that reduces the amortizable amount.
• Using the wrong useful life: The useful life should reflect the period over which the asset provides economic benefit — not necessarily its legal life. A 20-year patent expected to be superseded in 8 years should be amortized over 8 years.
• Failing to reassess useful life: If circumstances change (e.g., a competitor enters the market), the remaining useful life should be reassessed and amortization adjusted prospectively.

Summary of Key Journal Entries

Transaction	Debit	Credit
Amortize intangible asset	Amortization Expense	Accumulated Amortization
Loan payment (interest + principal)	Interest Expense + Loan Payable	Cash
Amortize deferred financing costs	Interest Expense	Deferred Financing Costs
Amortize prepaid expense	Expense account	Prepaid asset
Impairment of intangible asset	Impairment Loss	Accumulated Amortization

Proper amortization accounting ensures that the cost of intangible assets and loan principal repayments are systematically recognized in the correct periods. Whether you are writing down a patent over its useful life or allocating loan payments between interest and principal, these journal entries keep your financial statements accurate and compliant with GAAP and IFRS.