Inside the Cash Machine Screen: FCF Yield With Guardrails
Zorro's Cash Machine screen pairs an 8% free-cash-flow-yield floor with margin and debt guards - here is why FCF yield alone is not enough.
A single ratio is easy to game
Free-cash-flow yield - free cash flow divided by market cap - is one of the more honest valuation metrics available, because free cash flow is harder to dress up than reported earnings. It survives a lot of the accounting choices that inflate net income. But "harder to game" is not "impossible to game," and a screen built on FCF yield alone will still surface businesses where the number is real but temporary: a company that sold a division, one that deferred maintenance capital spending it will have to spend eventually, or one whose working capital swung in its favor for a single quarter. None of those show up as a red flag in the FCF yield figure itself.
Zorro's screener handles this with a preset called "Cash machine," one of eight one-click screens across the stock universe. Rather than ranking on FCF yield by itself, it requires four conditions at once, and each one is there to catch a specific way the headline number can mislead.
The four conditions
The screen requires: free-cash-flow yield of at least 8%, operating margin of at least 10%, debt-to-equity below 1.5 (or simply unreported), and positive trailing EPS. It also excludes bank-like businesses entirely, for a reason worth explaining before the four numeric conditions.
A lender's "free cash flow" isn't the same thing as an operating company's. For a bank, most of what would show up as cash flow is loan origination and deposit movement - balance-sheet activity, not owner earnings left over after running the business. Comparing that figure to a manufacturer's or a software company's FCF yield is comparing two different concepts that happen to share a name, so the screen - like the rest of the site's value model - drops financials from consideration rather than ranking them on a number that doesn't mean the same thing for their business.
That leaves the four conditions to do the filtering on everything else. The 8% FCF-yield floor is the headline test, but on its own it would let through a company whose free cash flow is real this year and nowhere close to repeatable - a retailer that let inventory run down, for instance, generates a cash inflow that reverses the moment it restocks. The operating-margin floor is the check against that: a double-digit operating margin means the core business is actually profitable on a recurring basis, not just cash-rich in a given period from a balance-sheet shuffle. A company can show high FCF yield with a thin or negative operating margin - that combination is exactly what this screen is built to exclude.
Why the debt ceiling sits where it does
The 1.5x debt-to-equity ceiling is deliberately looser than some of the screener's other presets. The site's Quality compounder screen caps leverage at 1x, tighter than Cash machine's 1.5x, because it is also demanding 15% operating margins and 15% ROIC - a stricter combination overall that can afford a tighter debt test without excluding almost everything. Cash machine leans more heavily on the cash-flow and margin tests and leaves more room on the balance sheet, on the logic that a free-cash-flow-rich business can service more debt than a low-margin one before that debt becomes a real risk. It is not that debt doesn't matter here - a name with no debt-to-equity figure reported at all still passes, since there's nothing to flag, but a highly levered one with debt-to-equity above 1.5 is cut regardless of how good its FCF yield looks, because a downturn or a refinancing at a worse rate hits a heavily indebted cash generator harder than it hits one funded mostly by equity.
The positive-EPS requirement closes the last gap: a business can generate free cash flow for a stretch while posting GAAP losses, usually from non-cash charges like depreciation or amortization running well ahead of real wear on the assets, or from one-off items below the operating line. That is not automatically a bad sign, but it is a different story than a business that is both cash-generative and profitable on paper, and this screen is built to find the latter.
What it leaves out
Cash machine says nothing about valuation beyond the FCF yield floor itself - it does not test price-to-earnings or price-to-book, so a stock can clear every condition here while still looking expensive on other measures, or vice versa. It also says nothing about growth: a shrinking but highly cash-generative business can pass this screen just as easily as a growing one, which is a real difference from a screen like GARP that specifically wants growth alongside a reasonable price. And like every preset on the screener, it is computed from the last reported financials, not a forecast - a company passing today can fail next quarter if a margin compresses or free cash flow comes in lighter, and nothing about clearing four conditions in a backward-looking dataset says anything about where the stock trades from here.
The deeper piece on how FCF yield itself gets mismeasured - capex timing, stock-based compensation add-backs, and the other places the ratio quietly breaks - is worth reading alongside this one; this screen's margin and debt floors are the guardrails built around exactly those failure modes, not a substitute for understanding them.