Amortization

Amortization has two closely related meanings, both about spreading a cost over time. In the asset sense, it is the gradual expensing of an intangible asset — something with value but no physical form, such as a patent, goodwill, or purchased software — across its useful life, the same way depreciation spreads the cost of a physical asset.

In the loan sense, amortization is the schedule by which a loan’s principal is paid down over its term. An amortization schedule shows how each payment splits between interest and principal, with the principal portion growing as the balance shrinks — which is why early payments are mostly interest and later ones mostly principal.

Expensing a long-lived intangible all at once would distort a single period’s profit and understate the asset’s value in every period after. Amortization matches the cost to the periods that benefit from it, so the P&L and the balance sheet both stay closer to economic reality.

On the loan side, splitting each payment between interest (an expense) and principal (a reduction of a liability) is what keeps a loan recorded correctly — a frequent cleanup finding is a loan where every payment was booked entirely to expense, leaving the liability balance wrong for years.

They are the same idea applied to different assets. Amortization spreads the cost of intangible assets — patents, goodwill, software. Depreciation spreads the cost of tangible, physical assets — equipment, vehicles, buildings. The accounting mechanics are parallel; the distinction is simply whether you can touch the asset. How either is calculated for a tax return follows separate tax rules confirmed with your CPA or EA.