Two companies each report CFO of ₹500 crore. One collected it from customers on profitable, repeating sales. The other squeezed it out by not paying suppliers for an extra month, selling its receivables to a bank and running down inventory. Same number, entirely different meaning. And next year, everything the second company leaned on reverses. So rank every rupee of CFO by how long it will last.
Tier 1, earned cash: profit converting on schedule. Net income plus steady non-cash add-backs, with working capital taking its predictable growth toll. It repeats as long as the business does. It's the only tier that deserves a multiple.
Tier 2, structural float. Here customers and suppliers finance operations through advances and negative working capital, so growth releases cash. You saw the mechanics with the working-capital ratios. It lasts, but only while growth lasts, and it runs in reverse when revenue shrinks. Grade it high, with a cyclicality asterisk.
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Which parts of operating cash flow can't you rely on?
Tier 3, episodic release. A one-time inventory drawdown after an over-stocked year. A collections catch-up on old receivables. A big advance on a single contract. The cash is real and fairly obtained, but it won't come again. Strip it out of the run-rate in your head.
Tier 4, borrowed cash flow: financing wearing an operating mask. Start with stretched payables. DPO jumping from 40 to 65 days manufactures one-time cash equal to ~25 days of purchases. Then it plateaus, and suppliers retaliate on price. Receivables can be factored or securitized, which pulls tomorrow's collections into today's CFO, and often the only disclosure is a footnote. Supply-chain finance has a bank pay your supplier now while you pay the bank later, so those payables are economically debt. Channel or dealer financing pushes the same trick one tier down. All of it is borrowing routed through the operating section. You catch it by watching DPO and DSO trends and reading the factoring and SCF notes. Look for receivables falling while revenue rises without a collections story to explain it.
Tier 5, cosmetic and classification. Ind AS interest-in-CFF flattery, which you restate away. One-off tax refunds. An SBC add-back that swells while the share count climbs, which the SBC section takes apart. Operating costs capitalized into CFI so they never touch CFO, the WorldCom move. The forensic modules own that one, though the capex/D&A ratio is your tripwire. None of this generates cash. It's presentation.
How do you tell whether a rise in CFO is sustainable?
The working question: when CFO grows, decompose the growth. ΔCFO = ΔNI + Δnon-cash + ΔWC-swing + Δother. If ΔNI explains it, you're looking at Tier 1. Carry on. If a payables swing explains it, that's Tier 4. Now you should expect next year's CFO to disappoint by the same amount. Watch for CFO growth that comes from Tier 3 or 4 for two years running while the P&L applauds. It's the most common early-warning pattern in the forensic case files, the shape of IL&FS and Carillion.