The financial measures that determine a company’s credit rating cluster into five families: leverage, interest coverage, cash flow, liquidity, and profitability. S&P Global Ratings anchors its corporate analysis on two ratios in particular — funds from operations (FFO) to debt, and debt to EBITDA — and supplements them with several cash flow coverage and payback metrics.1S&P Global Ratings. General: Corporate Method Those numbers never stand alone. Agencies restate the reported financials with their own adjustments, then read the resulting ratios against industry-specific benchmarks and a qualitative view of competitive position and management before landing on a letter grade.
Leverage: Debt Relative to Earnings
If any single category carries the most weight, it is leverage, and the ratio analysts reach for first is debt to EBITDA. EBITDA (earnings before interest, taxes, depreciation, and amortization) strips out accounting choices about depreciation schedules and financing structures, giving a rough proxy for cash generated by operations. Debt to EBITDA compares total borrowings against that earning power.
S&P publishes benchmark tables that map debt-to-EBITDA ranges to leverage assessments, with the thresholds shifting by industry volatility. For companies in standard-volatility industries, the benchmarks run roughly like this:1S&P Global Ratings. General: Corporate Method
- Minimal leverage: below 1.5x
- Modest leverage: 1.5x to 2.0x
- Intermediate leverage: 2.0x to 3.0x
- Significant leverage: 3.0x to 4.0x
- Aggressive leverage: 4.0x to 5.0x
- Highly leveraged: above 5.0x
Companies in steadier industries, such as regulated utilities, get more lenient thresholds. A utility at 4.0x debt-to-EBITDA might receive the same leverage assessment as an industrial company at 3.0x, because the utility’s cash flows are more predictable. Cyclical industries face the opposite treatment: the same ratio is judged more harshly.
Debt to equity also gets attention as a capital structure measure. It compares total liabilities to shareholders’ equity, showing how much of the asset base is funded by creditors versus owners. Agencies weight debt-to-EBITDA more heavily, though, because it ties debt to earning power rather than to an accounting-derived equity figure that share buybacks or accumulated goodwill can distort.
Interest Coverage
Carrying debt is only sustainable if the company can comfortably meet its interest payments. EBITDA to interest is the core coverage measure in S&P’s methodology. For standard-volatility industries, the benchmarks look like this:1S&P Global Ratings. General: Corporate Method
- Minimal risk: more than 15x
- Modest risk: 10x to 15x
- Intermediate risk: 6x to 10x
- Significant risk: 3x to 6x
- Aggressive risk: 2x to 3x
- Highly leveraged: below 2x
A coverage ratio below 2x in a normal-volatility industry signals that even a moderate earnings decline could leave the company struggling to meet interest. That is where downgrades become likely. Coverage above 6x, by contrast, gives enough cushion that creditors can weather a meaningful recession without serious concern.
S&P also calculates FFO plus interest paid divided by cash interest paid as a supplemental coverage ratio, capturing the same idea using cash-based earnings rather than EBITDA.2S&P Global Ratings. General: Corporate Methodology: Ratios and Adjustments EBITDA can include non-cash revenue or exclude real cash costs that flow through working capital, so grounding coverage in FFO ties it to actual dollars collected and spent.
Cash Flow: Following the Actual Money
Debt is paid with cash, not accounting earnings. S&P designates FFO-to-debt and debt-to-EBITDA as its two core credit ratios, then adds three cash flow payback measures: cash flow from operations (CFO) to debt, free operating cash flow (FOCF) to debt, and discretionary cash flow (DCF) to debt.1S&P Global Ratings. General: Corporate Method
Each measure peels away another layer. FFO starts with EBITDA and subtracts cash interest and cash taxes, producing cash generated from operations before working capital swings.2S&P Global Ratings. General: Corporate Methodology: Ratios and Adjustments CFO adjusts FFO for changes in working capital, showing whether the company is tying up more cash in inventory and receivables or freeing it. FOCF goes further by subtracting capital expenditures, revealing the cash left after maintaining and growing the asset base. DCF subtracts dividends, showing what is truly available for debt repayment.
For standard-volatility industries, S&P’s benchmarks set FOCF-to-debt at 15% to 25% for an intermediate leverage assessment and above 40% for minimal leverage.1S&P Global Ratings. General: Corporate Method Companies that consistently generate FOCF above 25% of total debt have strong internal capacity to reduce leverage without external financing. Consistency across cycles counts for a lot: a company with slightly higher leverage but rock-steady cash generation often receives a more favorable assessment than one with lower average leverage and wild year-to-year swings.
Liquidity: Surviving the Short Term
A company can be profitable on paper and still default if it runs out of cash at the wrong moment. Liquidity measures test whether immediate resources cover near-term obligations, and agencies use them as an initial screen before longer-term leverage analysis.
The current ratio divides current assets by current liabilities. Above 1.0, the company owns more assets maturing within a year than debts coming due in that window. The quick ratio, sometimes called the acid-test ratio, tightens the test by stripping out inventory, which can be slow or expensive to convert to cash, especially in industries with perishable goods or fast-moving technology. Keeping the quick ratio well above 1.0 signals a real buffer against sudden cash demands.
Beyond snapshot ratios, analysts look at how efficiently the company cycles cash through operations. The cash conversion cycle measures total time from paying suppliers for inventory to collecting cash from customers. A shorter cycle means less cash tied up in daily operations and less exposure to a liquidity crunch during a revenue slowdown. Industries with naturally long cycles, like aerospace manufacturing, are judged against different expectations than retailers collecting cash at the register.
Agencies also assess liquidity sources qualitatively: the size and remaining term of undrawn credit facilities, the timing of upcoming debt maturities, and the company’s demonstrated access to capital markets. A company with tight ratios but a large untapped revolving credit facility and no major maturities for two years is in a different position than one with the same ratios and a billion-dollar bond coming due next quarter.
Profitability and Its Consistency
Margins and returns show whether the business model generates enough income to sustain the capital structure over time. Gross margin reveals pricing power and production efficiency. Operating margin narrows to profit from core operations after overhead and selling costs. Net profit margin captures what remains after interest, taxes, and everything else.
Return on assets (ROA) measures how much profit the company squeezes from each dollar of its asset base. Return on equity (ROE) does the same for shareholder capital, though ROE can be artificially inflated by heavy borrowing: a company that loads up on debt reduces its equity base, making the return on whatever equity remains look impressive even if the underlying business is mediocre. Rating analysts read ROE alongside leverage ratios for exactly this reason.
Consistency matters even more than the level. A company delivering steady 15% operating margins through recessions and expansions presents a more creditworthy profile than one alternating between 25% and 5%. Consistent margins suggest durable competitive advantages, efficient cost management, and revenue streams that do not evaporate when the economy softens.
Agency Adjustments to the Reported Numbers
Rating agencies do not pull ratios directly from a company’s published financial statements. They restate those financials using their own adjustments, and the adjusted numbers can look dramatically different from the reported ones.
S&P calculates adjusted EBITDA by starting with reported revenue and operating expenses, then layering in modifications. These include adding back stock-based compensation expense, adjusting for operating lease obligations, removing non-recurring restructuring charges, adding cash dividends received from equity-method affiliates while excluding the reported equity income, and adjusting for pension and other post-retirement benefit obligations.2S&P Global Ratings. General: Corporate Methodology: Ratios and Adjustments Moody’s makes comparable adjustments for unfunded pension liabilities, operating leases, hybrid financial instruments, securitizations, and capitalized interest.3Moody’s Investors Service. Financial Statement Adjustments and Ratios
Operating leases show why this matters. Before recent accounting standards required companies to capitalize most leases on the balance sheet, a retailer operating entirely from leased stores could report far lower debt than one that owned its locations, even though both had comparable fixed payment obligations. Rating agencies have treated lease commitments as debt-like obligations for decades, long before accounting rules caught up. Even now, the agencies’ lease adjustments differ from what GAAP requires, so an agency’s adjusted debt figure for the same company will often be higher than what appears on the balance sheet.
The practical takeaway: published benchmarks about what debt-to-EBITDA level corresponds to a given rating assume agency-adjusted numbers. Comparing a company’s reported ratios against those thresholds without making similar adjustments gives a misleadingly optimistic picture.
Industry Context and Qualitative Overlay
Financial ratios never exist in a vacuum. S&P’s corporate methodology explicitly varies its leverage and coverage benchmarks across three tiers of industry volatility, and the differences are substantial. For low-volatility industries, a debt-to-EBITDA ratio of 4x to 5x falls into the “significant” leverage category, while the same ratio in a standard-volatility industry lands in the “aggressive” bucket.1S&P Global Ratings. General: Corporate Method
Beyond volatility classification, agencies evaluate competitive position within the industry: market share, barriers to entry, pricing power, product diversification, and geographic spread. A dominant player in a consolidated industry with high customer switching costs will be assessed more favorably than a marginal competitor in a fragmented market, even at identical financial ratios. Revenue concentration in a single product line or customer relationship is a red flag; diversification across business segments and regions is a positive, though far-flung international operations create their own oversight challenges.
Management quality and corporate governance round out the qualitative picture. Agencies assess strategic decision-making, risk appetite, financial policy (including stated leverage targets and acquisition philosophy), and the track record of the management team. Board independence, transparency in financial reporting, and clarity of stated financial policies all factor in. A management team with a history of aggressive debt-funded acquisitions will receive more skeptical treatment than one with disciplined capital allocation.
The final rating is not a formula output. Agencies combine the quantitative financial risk profile driven by the ratios above with the qualitative business risk profile driven by industry risk, competitive position, and country risk to reach a preliminary anchor. Management, governance, and financial policy assessments can then raise or lower that anchor by one or more notches. Two companies with identical debt-to-EBITDA ratios can end up several notches apart because one operates in a stable industry with a dominant market position while the other competes in a volatile sector with thin advantages.
What the Resulting Letter Grade Means
The three dominant rating agencies in the United States are S&P Global Ratings, Moody’s Investors Service, and Fitch Ratings, each registered with the SEC as a Nationally Recognized Statistical Rating Organization.4U.S. Securities and Exchange Commission. Current NRSROs Their scales differ slightly in notation but convey the same idea: the higher the grade, the lower the perceived risk of default.
S&P’s scale runs from AAA at the top through AA, A, BBB, BB, B, CCC, CC, C, and down to D for default, with plus and minus modifiers within most categories. Moody’s uses a parallel system starting at Aaa and stepping through Aa, A, Baa, Ba, B, Caa, Ca, and C, with numerical modifiers (1, 2, 3). Fitch follows S&P’s notation closely. The critical dividing line sits at BBB- (S&P and Fitch) or Baa3 (Moody’s). At or above that level qualifies as investment grade; BB+ or Ba1 and below is speculative grade, sometimes called high-yield or junk.5S&P Global Ratings. Understanding Credit Ratings
That boundary is not academic. Many pension funds, insurance companies, and bond index managers are restricted from holding speculative-grade debt. A drop from A to A- raises borrowing costs modestly. A drop from BBB- to BB+, crossing into speculative grade, can be catastrophic: bond index funds that track investment-grade benchmarks must sell, insurance companies and pension funds with investment-grade-only mandates must liquidate, and loan agreements often contain covenants tied to maintaining investment-grade status. The resulting flood of selling can push bond prices down sharply, spiking the company’s effective cost of capital precisely when it can least afford it. Analysts call these companies fallen angels, and the pattern of forced selling and liquidity pressure is one of the most dangerous feedback loops in corporate finance. That is what all those ratios ultimately determine.