EBITDA: what it means, how to calculate it and why it is not cash flow

EBITDA stands for earnings before interest, taxes, depreciation and amortization. It measures how much profit a company generates from its core operations, before the effects of how it is financed (interest), where it is taxed (taxes) and how it accounts for past investments (depreciation and amortization).

By stripping out those four items, EBITDA aims to isolate operating performance. It approximates the cash a business produces from running its operations and makes it easier to compare companies that carry different levels of debt or invest in assets at different times.

There are two equivalent ways to reach EBITDA. The top-down path starts from operating profit (also called EBIT) and adds depreciation and amortization back. The bottom-up path starts from net income and adds back taxes, interest and depreciation and amortization.

• EBITDA = operating profit + depreciation + amortization.
• EBITDA = net income + taxes + interest + depreciation + amortization.

Example: a company with $100k of net income, $40k of taxes, $30k of interest and $80k of depreciation and amortization has an EBITDA of $250k. The same result comes from its $170k of operating profit plus $80k of depreciation and amortization. On $1 million of revenue, that is a 25% EBITDA margin.

Depreciation and amortization are non-cash charges. They spread the cost of assets bought in the past, machines, software, acquired intangibles, across several years, even though no cash leaves the business in the period. Adding them back removes an accounting effect that says little about how the operation is performing today.

Removing interest and taxes serves a related purpose. Interest reflects the capital structure, how much debt a company chose to take on, and taxes reflect the jurisdiction it operates in. Neither is about operating quality. That is what lets EBITDA sit close to operating margin while making two companies with very different financing comparable on the same footing.

The most common mistake is treating EBITDA as cash flow. It is not. EBITDA ignores capital expenditures, the cash a company spends to buy or replace assets, and it ignores changes in working capital, the cash tied up in receivables, payables and inventory. A business can post a healthy EBITDA and still burn cash.

To see real cash generation you need to keep going: subtract capex and working capital changes to reach free cash flow, and read the full cash flow statement. EBITDA is a proxy for operating cash generation, useful and quick, but it is a proxy, not the cash itself.

Adjusted EBITDA goes one step further and removes items management considers one-off or non-operational: restructuring costs, litigation, stock-based compensation, gains or losses on asset sales, or expenses tied to an acquisition. The goal is to show the recurring earning power of the business without the noise of unusual events.

The catch is that these adjustments are discretionary. What one company calls a one-off, another books as a normal cost, so adjusted EBITDA can be stretched to flatter a weak quarter. This is why investors like Warren Buffett have long been skeptical of leaning on EBITDA, and especially adjusted EBITDA, in place of real earnings. Read the adjustments line by line before trusting the number.

Software has very low marginal cost, so a mature SaaS can reach EBITDA margins well above what heavy-asset industries manage. But early-stage SaaS often runs a thin or negative EBITDA on purpose, reinvesting every dollar into growth. That is why profitability is usually read together with growth rather than in isolation.

The Rule of 40 captures that balance: growth rate plus profit margin (often an EBITDA or free cash flow margin) should clear 40%. The context keeps expanding, with Gartner projecting worldwide spending on SaaS applications approaching $300 billion in 2025, which is why investors, and consultancies like McKinsey and Bain, still lean on EBITDA multiples to value these businesses even as the mix of growth and profit shifts.