To calculate amortization in EBITDA, add together the annual amortization expense for every finite-lived intangible asset the company owns, then add that total back to net income along with interest, taxes, and depreciation. The full formula is EBITDA = Net Income + Interest + Taxes + Depreciation + Amortization. The amortization line captures non-cash charges for assets like patents, software licenses, customer lists, and acquired trade names, and adding it back shows what the business generates before those accounting entries reduce reported profit.
The Formula and Why Amortization Gets Added Back
The SEC defines EBITDA as earnings before interest, taxes, depreciation, and amortization, with “earnings” meaning net income under GAAP.1U.S. Securities and Exchange Commission. Non-GAAP Financial Measures That order tells you the mechanics: start at the bottom of the income statement and add back four things that obscure operating cash generation. Interest and taxes reflect financing and tax structure, not operations. Depreciation and amortization reduce reported profit without anyone writing a check.
Amortization is the intangible-asset version of depreciation. When a company buys a patent for $500,000 and spreads that cost over ten years, the $50,000 annual charge hits the income statement but no cash leaves the business. Adding it back to net income restores the picture of operating cash performance.
Which Intangibles Produce the Add-Back
Only intangible assets with a finite useful life are amortized. Indefinite-lived intangibles get tested for impairment instead and produce no recurring amortization expense to add back.2Financial Accounting Standards Board. Summary of Statement No. 142 The finite-lived category includes:
- Patents, which under federal law run 20 years from the filing date.3Office of the Law Revision Counsel. 35 USC 154 – Contents and Term of Patent; Provisional Rights
- Software licenses, amortized over the contractual license term.
- Franchise agreements running for a defined period.
- Customer relationships and non-compete agreements acquired in a business purchase, amortized over 15 years for tax purposes under IRC Section 197.4eCFR. 26 CFR 1.197-2 – Amortization of Goodwill and Certain Other Intangibles
- Copyrights and trademarks with a defined expiration or expected commercial life.
When one business buys another, most of the acquired intangibles fall under Section 197 and get amortized ratably over a flat 15-year period from the month of acquisition, regardless of actual expected life.5Office of the Law Revision Counsel. 26 USC 197 – Amortization of Goodwill and Certain Other Intangibles That list covers goodwill, customer lists, workforce-in-place value, government licenses, covenants not to compete, and trade names. Self-created intangibles developed internally, like a patent your own engineers filed, don’t fall under the 15-year Section 197 rule; they follow the useful-life estimate management adopts for book purposes and asset-specific rules for tax purposes.
Calculating Each Asset’s Annual Expense
Most intangibles are amortized using the straight-line method. GAAP calls for a method that reflects how the asset’s economic benefits are consumed, but straight-line is the default when that pattern cannot be reliably determined. The calculation is:
Annual Amortization = (Original Cost − Salvage Value) ÷ Useful Life in Years
Salvage value is almost always zero for intangibles, because the asset is worthless once the legal protection or contractual term ends. A $200,000 patent with 20 years of remaining term and no residual value produces $10,000 in annual amortization. A $750,000 customer list amortized over 15 years produces $50,000 per year.
Mid-Year Acquisitions
If the asset is acquired partway through the year, prorate the first year by the number of months owned. That $750,000 customer list purchased on April 1 produces nine months of amortization in year one: $50,000 × (9 ÷ 12) = $37,500. Full years each carry $50,000, and the final year picks up the remaining three months.
Revised Useful Life
When management revises the estimated useful life of an intangible, GAAP handles the change prospectively. The remaining book value gets spread over the new remaining life, and prior periods are not restated. The current period’s amortization figure, and therefore the add-back, will jump or drop accordingly. Footnotes should disclose the change.
Where to Find the Number on the Statements
If you’re working from a company’s published financials rather than building the number asset by asset, three places carry it.
The statement of cash flows is usually the cleanest source. Under the indirect method, the operating activities section lists amortization as an explicit add-back to net income. Some companies show it on its own line; others combine it with depreciation under a single heading.
The income statement sometimes breaks amortization out inside operating expenses, but more often it is bundled with depreciation or buried in a broader cost category.
The footnotes are where the detail lives. SEC rules require companies to report accumulated amortization for intangible assets separately on the balance sheet or in the notes, and to disclose the amount assigned to each major class of intangibles along with the weighted-average amortization period.6eCFR. 17 CFR 210.5-02 – Balance Sheets When amortization is not broken out on the face of the income statement, the notes must disclose the total for the period. If the cash flow statement gives you a combined D&A figure, the footnotes are where you split it.
Worked Example
A software company reports the following for the year:
- Net income: $1,200,000
- Interest expense: $180,000
- Income tax provision: $400,000
- Depreciation on servers and office equipment: $150,000
- Amortization on patents and acquired software: $220,000
EBITDA = $1,200,000 + $180,000 + $400,000 + $150,000 + $220,000 = $2,150,000.
The $220,000 amortization figure comes from the footnotes, which disclose $120,000 for a patent portfolio ($2.4 million cost over 20 years) and $100,000 for acquired software licenses ($500,000 over 5 years). Neither charge required a cash outlay during the year, so both belong in the add-back.
Goodwill Is Usually Not in the Number
Goodwill is the premium a buyer pays over the fair value of identifiable assets in an acquisition, and its treatment depends on the company. Public companies do not amortize goodwill under U.S. GAAP; they test it for impairment at least annually and record a loss only when carrying value exceeds fair value.2Financial Accounting Standards Board. Summary of Statement No. 142 There is no recurring goodwill expense to add back. When an impairment loss does hit the income statement, it is a non-cash charge and gets added back, but as a one-off rather than a predictable annual figure.
Private companies can elect to amortize goodwill on a straight-line basis over ten years, or a shorter period if a shorter life is more appropriate. If the election is made, that annual goodwill amortization becomes part of the amortization add-back like any other finite-lived intangible.
For a public company, then, the “A” in EBITDA covers only finite-lived intangibles such as patents and licenses. For a private company that elected the goodwill alternative, it also covers goodwill amortization. Mixing the two approaches can produce very different EBITDA figures for acquisition-heavy businesses.
Book Amortization, Not Tax Amortization
The amortization number for EBITDA comes from the GAAP financial statements, not the tax return. The two figures rarely match. Book amortization uses management’s best estimate of useful life; tax amortization for acquired intangibles is locked at 15 years under Section 197.5Office of the Law Revision Counsel. 26 USC 197 – Amortization of Goodwill and Certain Other Intangibles A patent with a 10-year book life and a 15-year tax life produces higher book amortization each year in the early years, creating a timing difference that shows up on the balance sheet as a deferred tax liability. None of that changes the EBITDA calculation; it only explains why the footnote figure will not tie to the tax return.
Standard EBITDA vs. Adjusted EBITDA
Many companies publish “Adjusted EBITDA” next to standard EBITDA. The adjusted version begins with the same formula and then strips out additional items management considers non-recurring or non-operational: stock-based compensation, restructuring charges, one-time legal settlements, gains or losses on asset sales, purchase-price-accounting adjustments from acquisitions, or accelerated amortization from shortened useful lives.
For the amortization component of standard EBITDA there is no judgment call. You add back the full period expense as reported. Judgment enters only when a company labels its number “Adjusted.” The SEC’s position is that an operating expense that occurs repeatedly, even at irregular intervals, is recurring, and excluding it from a non-GAAP measure can be misleading.1U.S. Securities and Exchange Commission. Non-GAAP Financial Measures If a figure you’re working with is labeled Adjusted EBITDA, get the reconciliation back to net income and read each add-back before relying on it.