Why do PE models often rely on EBITDA as a starting point, and what adjustments are typically made to arrive at sustainable cash flow?

• A. EBITDA is widely available and comparable; adjust for non-recurring items, owner-run expenses, and one-time costs; further convert to FCF by deducting taxes, capex, and changes in working capital
• B. EBITDA already equals cash flow; no adjustments
• C. EBITDA should be modified by adding back all debt payments
• D. EBITDA is not used in valuation

Answer: (A)

Starting from EBITDA makes sense because it cleanly reflects ongoing operating performance while stripping out financing, taxes, and non-cash accounting items, making it easy to compare across different companies. To turn that into a sustainable cash flow, you normalize EBITDA by removing non-recurring items, owner-related expenses, and other one-time costs so you’re looking at the amount the business can generate from its core operations on a repeatable basis. Then you convert that normalized figure into cash flow by deducting cash taxes, maintenance capital expenditure (the capex needed to keep the business running), and changes in working capital. The result is a cash-flow measure that more accurately represents what the business can generate and deploy for debt service or distributions, rather than EBITDA alone.

EBITDA is not cash flow, and debt payments are financing decisions rather than operating cash flow; EBITDA is indeed used in valuation as a starting point, but the real driver for sustainable cash flow is the set of adjustments that yields after-tax, maintenance-level cash flow plus working-capital considerations.