Adjusted EBITDA is a non-GAAP financial metric that companies construct by taking their reported earnings and adding back expenses they wish investors to ignore — depreciation, amortization, interest, taxes, stock-based compensation, restructuring charges, and an expanding catalog of items labeled "one-time" or "non-recurring." The result is a number that is always higher than GAAP net income, often dramatically so, and that presents a version of the company's financial performance from which the costs of doing business have been surgically removed. Understanding what is adjusted out — and why — is the most important analytical skill an investor can develop for evaluating modern corporate earnings.
GAAP Versus Non-GAAP: Two Versions of the Truth
Generally Accepted Accounting Principles — GAAP — are the standardized rules that govern how public companies record and report their financial results. GAAP requires the recognition of all revenues and expenses, including non-cash expenses like stock-based compensation and depreciation. GAAP net income is the number that appears on the income statement filed with the SEC. It is audited. It is regulated. It is the legal truth.
Non-GAAP earnings are alternative metrics that companies present alongside GAAP results, purportedly to give investors a "clearer picture" of the underlying business performance by stripping out items that management considers non-representative. The SEC requires that every non-GAAP metric be accompanied by a reconciliation to the nearest GAAP equivalent — a table showing exactly what was added back or removed. But the reconciliation is typically buried in the supplemental tables of the earnings release, while the non-GAAP number is featured in the headline, the press release title, and the CEO's opening remarks on the earnings call.
The gap between GAAP and non-GAAP earnings has widened consistently over the past two decades. For S&P 500 companies in aggregate, non-GAAP earnings exceed GAAP earnings by approximately 15 to 25 percent in a typical year. For high-growth technology companies, the gap can exceed 100 percent — a company that reports a GAAP net loss of $500 million may simultaneously report positive adjusted EBITDA of $200 million. Both numbers are technically accurate. They describe different realities.
Stock-Based Compensation: The Largest Adjustment
The single largest and most consequential non-GAAP adjustment is the exclusion of stock-based compensation. SBC is the cost of equity grants — options, restricted stock units, and performance share units — issued to employees as part of their compensation. Under GAAP, SBC is recognized as an expense on the income statement, valued at the grant date fair value using options pricing models. Under adjusted EBITDA, SBC is added back as though it were not a real cost.
SBC is a real cost. When a company issues new shares to employees, it dilutes existing shareholders — each outstanding share represents a smaller fraction of the company's total equity. A company that issues 3 percent of its outstanding shares annually in SBC is imposing a 3 percent annual dilution on every existing shareholder. The economic effect is identical to the company paying employees in cash and then conducting a secondary offering to raise the cash — a transaction that would be universally recognized as an expense. The SBC adjustment removes this cost from the earnings calculation while the dilution it creates persists in the share count.
For some technology companies, SBC represents 15 to 25 percent of total revenue. A company with $10 billion in revenue and $2 billion in SBC is paying one-fifth of its top line to employees in equity. Excluding this cost from earnings is the equivalent of a manufacturing company excluding the cost of raw materials — it produces a profit figure that bears no relationship to the economic reality of the business.
"One-Time" Charges That Recur Every Year
The second category of non-GAAP adjustments — restructuring charges, acquisition-related costs, litigation settlements, and asset impairments — is labeled "one-time" or "non-recurring." The label implies that these charges are anomalous events that distort the company's underlying operational performance and should therefore be excluded from the investor's assessment.
The empirical reality is that these charges recur with remarkable consistency. A study of S&P 500 companies found that more than 80 percent of companies reporting "non-recurring" charges in one year report similar charges in the following year. A company that restructures annually is not experiencing a one-time event. It is operating a business that requires continuous restructuring — a structural characteristic that adjusted EBITDA systematically conceals.
Acquisition-related costs are particularly problematic. A company that grows through serial acquisitions incurs integration costs, inventory fair-value adjustments, and amortization of acquired intangible assets with every deal. These costs are a direct consequence of the company's chosen growth strategy. Excluding them from earnings presents a version of the company's performance that reflects organic operations while the balance sheet reflects acquisition-driven growth — a fundamental inconsistency that the reconciliation table reveals but that the headline number obscures.
How to Read an Earnings Release
The disciplined investor reads the earnings release in reverse order. Begin with the GAAP reconciliation table. Identify every item that has been adjusted out. Calculate the total adjustment as a percentage of GAAP revenue. If the total exceeds 10 percent of revenue, the adjusted number is presenting a materially different business than the one that actually exists.
Next, examine the SBC line. Calculate SBC as a percentage of revenue and compare it to the company's peers. If SBC is 20 percent of revenue, the company is paying one-fifth of its sales in equity grants. Determine whether the share count is growing (indicating the dilution is real and ongoing) or stable (indicating the company is buying back shares to offset the dilution — a buyback program funded by the SBC expense it has excluded from adjusted earnings).
Then examine the "one-time" charges. Compare the current quarter's adjustments to the prior four quarters. If similar charges appear in three or more of the five most recent quarters, they are not one-time. They are operating costs that the company has chosen to classify as non-recurring.
Only after completing this analysis should the investor consider the adjusted EBITDA figure — and even then, the figure should be evaluated as one data point among several, not as the definitive measure of the company's profitability. The company that presents adjusted EBITDA as its primary metric is asking the investor to evaluate a version of the business from which the costs of compensation, growth, and operational complexity have been removed. The investor who accepts that invitation is evaluating a fiction.
The Regulatory Landscape
The SEC has issued guidance repeatedly warning companies against presenting non-GAAP metrics in a manner that gives them "undue prominence" relative to GAAP results. Regulation G requires reconciliation to the nearest GAAP measure. The SEC's Division of Corporation Finance has issued comment letters to hundreds of companies challenging specific non-GAAP adjustments that the staff considers misleading.
Despite this scrutiny, the practice has expanded rather than contracted. Non-GAAP metrics are now the default language of earnings calls, investor presentations, and executive compensation targets. The incentive structure is self-reinforcing: companies that present higher non-GAAP earnings attract higher valuations, which reduces their cost of capital, which funds the operations that generate the adjusted metrics. The investor who relies solely on adjusted EBITDA is participating in a valuation framework that has been deliberately constructed to present the most favorable possible version of reality.