---
name: buffett-financial-analysis
description: Analyzes a company's financial statements to identify whether it has a durable competitive advantage and is a potential long-term investment opportunity, using Warren Buffett's framework from "Warren Buffett and the Interpretation of Financial Statements" by Mary Buffett and David Clark. Use this skill when the user asks to analyze a company's financials, evaluate an investment opportunity, or assess whether a business has a moat or durable competitive advantage.
---

# Buffett Financial Statement Analysis

This skill applies Warren Buffett's framework for identifying companies with a **durable competitive advantage (DCA)** — the single most important factor in his investment approach. The goal is not to find cheap stocks, but to find exceptional businesses worth owning for 10–20+ years.

## Core Investment Philosophy

Buffett divides businesses into two groups:
1. **Companies with a durable competitive advantage** — sell a unique product/service or are the low-cost buyer/seller of a product the public consistently needs. Their earnings are consistent and grow over time.
2. **Mediocre companies** — compete in fiercely competitive markets, suffer boom/bust cycles, require constant capital reinvestment, and rarely create long-term shareholder wealth.

**What creates a DCA:**
- Selling a unique product (Coca-Cola, Wrigley, Hershey, Pepsi)
- Selling a unique service (Moody's, American Express, H&R Block)
- Being the low-cost buyer/seller of a needed product (Walmart, Costco, Burlington Northern)

**The key word is "durability"** — look for *consistency* across 5–10 years of data, not a single good year.

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## Step-by-Step Analysis Framework

When analyzing a company, work through all three financial statements in order. Request 10 years of data where possible — single-year snapshots are nearly worthless for this analysis.

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### PART 1: INCOME STATEMENT ANALYSIS

#### 1. Gross Profit Margin
**Formula:** Gross Profit ÷ Total Revenue

| Margin | Interpretation |
|--------|---------------|
| ≥ 40%  | Strong sign of potential DCA — pricing power above competition |
| 20–40% | Competitive industry; possible DCA but investigate further |
| ≤ 20%  | Fierce competition; no sustainable advantage |

**Reference points:** Moody's: 73%, Coca-Cola: 60%+, Wrigley: 51%, Burlington Northern: 61% vs. United Airlines: 14%, GM: 21%, U.S. Steel: 17%.

**Critical:** Check this number *consistently* over 10 years. One-time high margins mean nothing.

#### 2. Selling, General & Administrative (SGA) Expenses
**Formula:** SGA ÷ Gross Profit

| Ratio   | Interpretation |
|---------|---------------|
| < 30%   | Fantastic — strong sign of DCA |
| 30–80%  | Acceptable — many DCA companies fall here |
| ≥ 100%  | Danger sign — highly competitive, company losing money |

**Watch for wild year-to-year variation** — that signals a company without a DCA reacting to competitive pressure. GM swung from 28% to 83%; Ford hit 89%–780%.

#### 3. Research & Development (R&D) Expenses
- **Little or no R&D = good.** Companies with a true DCA don't need to constantly reinvent their products (Coca-Cola, Wrigley, Moody's have zero R&D).
- **High R&D = risk.** If the competitive advantage depends on patents or technology, it is fragile — patents expire, technology gets disrupted.
- **Rule:** If a company *must* spend heavily on R&D to maintain its advantage, the advantage is not durable. Avoid.
- Intel (30% of gross profit on R&D), Merck (29% R&D + 49% SGA = 78% combined) are examples of DCA fragility.

#### 4. Depreciation as % of Gross Profit
- Companies with DCA have **lower** depreciation relative to gross profit because their products don't change, so their plant/equipment lasts longer.
- Coca-Cola: ~6%, Wrigley: ~7%, P&G: ~8%
- GM: 57–72% — capital-intensive, constantly retooling
- Lower = better.

#### 5. Interest Expense as % of Operating Income
- **Consumer products DCA companies: < 15%** is the target.
- **Compare within the same industry** — Wells Fargo at 30% is excellent for banking; 30% for a manufacturer is bad.
- Procter & Gamble: 8%, Wrigley: 7% vs. Goodyear: 49%, American Airlines: 92%
- Companies with DCA tend to carry little debt, so little interest expense.
- **Red flag:** If interest expense as a % of operating income spikes dramatically (Bear Stearns went from 70% to 230% before collapse), danger is imminent.

#### 6. Net Earnings Margin
**Formula:** Net Earnings ÷ Total Revenue

| Margin  | Interpretation |
|---------|---------------|
| > 20%   | Strong sign of DCA |
| 10–20%  | Gray area — investigate thoroughly |
| < 10%   | Likely highly competitive; no sustainable advantage |

**Exception:** Banks and financial companies — abnormally high net margins may signal excessive risk-taking, not a DCA.

**Reference:** Coca-Cola: 21%, Moody's: 31% vs. Southwest Airlines: 7%, GM: 3% (in good years).

**Look for consistent upward trend** — not just absolute margin level.

#### 7. Per-Share Earnings (EPS) — 10-Year Trend
This is one of the most important single indicators.

**Ideal pattern (Buffett wants to see):**
- Consistent upward trend over 10 years
- No large losses or erratic swings
- Example: $1.30 → $1.42 → $1.48 → $1.60 → $1.65 → $1.95 → $2.06 → $2.17 → $2.37 → $2.68 → $2.95

**Red flag pattern:**
- Wild swings, losses mixed with profits, downward trend
- Example: $8.53 → $6.68 → $5.24 → $1.77 → $3.35 → $5.03 → $6.39 → ($6.05) loss → $3.89 → ($0.45) loss → $2.50

**Note:** Also look at *total net earnings*, not just per-share, since buybacks can inflate EPS even when actual profits are flat or declining.

#### 8. Income Taxes Paid (Truth Test)
- Take reported pre-tax income and multiply by ~35% (US corporate rate, adjust for current rates).
- If taxes paid ≠ approximately 35% of pre-tax income, question the accuracy of reported earnings.
- Companies trying to mislead the IRS are usually also misleading shareholders.

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### PART 2: BALANCE SHEET ANALYSIS

#### 9. Cash & Cash Equivalents
- **Large cash pile from operations (not from debt issuance or asset sales) = strong DCA signal.**
- Check 7+ years of balance sheets: Is cash growing consistently from business operations alone?
- Little cash + large debt = mediocre business struggling to survive.
- Large cash + little/no debt + no new share issuance + consistent earnings = excellent DCA candidate.

#### 10. Inventory (Manufacturing Companies)
- Look for inventory and net earnings **rising in tandem** over time — indicates profitable growth.
- Inventory that rapidly ramps up then crashes = boom/bust competitive industry. Avoid.

#### 11. Net Receivables vs. Competitors
- Compare Net Receivables as a % of Gross Sales against industry peers.
- Consistently lower than competitors = pricing/demand advantage (customers pay faster).

#### 12. Property, Plant & Equipment (PP&E)
- DCA companies **don't need to constantly upgrade** their plant/equipment — their products don't change.
- They replace equipment when it wears out, not before.
- Companies without DCA must constantly retool to stay competitive, generating ongoing debt.
- Compare Wrigley ($1.4B PP&E, $1B debt, $500M earnings) vs. GM ($56B PP&E, $40B debt, losing money).

#### 13. Goodwill
- Rising goodwill = company is acquiring other businesses. Are those businesses also DCA companies?
- Companies with DCA rarely sell below book value — so acquisitions of DCA companies always create goodwill.
- Stable goodwill = not acquiring, or buying at/below book value.

#### 14. Long-Term Debt — The Most Critical Balance Sheet Indicator
**Rule: Little or no long-term debt = good long-term bet.**

- DCA companies are so profitable they self-finance and rarely need debt.
- Check 10 years of balance sheets for consistently low or no long-term debt.
- **Key test:** Can the company pay off all long-term debt from 3–4 years of net earnings?
  - Coca-Cola and Moody's: can pay off in 1 year ✓
  - Wrigley, Washington Post: can pay off in 2 years ✓
  - GM, Ford: could spend every dime of earnings for 10+ years and still not pay it off ✗

**Post-LBO exception:** If a DCA company has excessive debt from a leveraged buyout, consider its bonds instead of equity — earnings will be focused on debt payoff, not growth.

#### 15. Short-Term Debt (for Financial Institutions)
- Avoid banks/financials with more short-term debt than long-term debt.
- Wells Fargo: 57¢ short-term per $1 long-term (conservative) ✓
- Bank of America: $2.09 short-term per $1 long-term (aggressive) ✗
- Short-term borrowing to fund long-term assets is the classic recipe for financial collapse.

#### 16. Retained Earnings — Warren's Secret Weapon
- **Growing retained earnings year-over-year = one of the strongest DCA indicators.**
- Formula: Prior retained earnings + Net earnings − Dividends − Stock buybacks = New retained earnings
- Annual growth rates of Buffett favorites: Coca-Cola: 7.9%, Wrigley: 10.9%, Burlington Northern: 15.6%, Wells Fargo: 14.2%, Berkshire Hathaway: 23%
- Negative retained earnings from losses = mediocre business.
- Negative retained earnings from profitable companies that returned all capital to shareholders (like Microsoft historically) = can be a DCA company, but verify with earnings history.

#### 17. Treasury Stock
- **Presence of treasury stock + history of buybacks = hallmark of DCA.**
- Only companies generating excess cash can afford consistent buybacks.
- Also increases per-share earnings (fewer shares = higher EPS per dollar of net income).

#### 18. Return on Shareholders' Equity (ROE)
**Formula:** Net Earnings ÷ Shareholders' Equity

- DCA companies consistently show **higher-than-average ROE**.
- Coca-Cola: 30%, Wrigley: 24%, Hershey's: 33%, Pepsi: 34%
- Airlines (no DCA): United: 15% (profitable years), American: 4%, Delta/Northwest: negative
- **Caution:** Very high ROE may be from leverage (debt) rather than genuine business strength. Test: Add treasury stock back to equity, recalculate ROE — if still high, it's real.

#### 19. Debt-to-Equity Ratio (Adjusted for Treasury Stock)
**Formula:** Total Liabilities ÷ (Shareholders' Equity + Treasury Stock)

| Ratio (non-financial companies) | Interpretation |
|--------------------------------|---------------|
| < 0.80                         | Likely DCA |
| > 0.80                         | Investigate further |

- Add back treasury stock value before comparing — otherwise buyback-heavy companies look artificially leveraged.
- P&G adjusted: 0.71, Wrigley adjusted: 0.68, Goodyear: 4.35, Ford: 38.0
- Banks are a special case — ratios of 7–10x are normal; look for lower-than-peers as the signal.

#### 20. Preferred Stock
- **Absence of preferred stock = good sign.** DCA companies don't need expensive external capital.
- Preferred dividends are not tax-deductible (unlike interest), making it costly money.
- Companies that issue preferred stock often need capital they can't generate internally.

#### 21. Return on Total Assets
**Formula:** Net Earnings ÷ Total Assets

- Higher is generally better, but **very high returns on assets may signal fragility** in the DCA.
- Coca-Cola: 12% (huge asset base = high barrier to entry) ✓
- Moody's: 243% (tiny asset base = low barrier to entry, vulnerable to new competition) ⚠️
- High assets = high cost for a competitor to replicate = more durable DCA.

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### PART 3: CASH FLOW STATEMENT ANALYSIS

#### 22. Capital Expenditures as % of Net Earnings (10-Year Total)
**Formula:** 10-year total capex ÷ 10-year total net earnings

| Ratio  | Interpretation |
|--------|---------------|
| < 25%  | Strong DCA signal |
| 25–50% | Possible DCA — investigate |
| > 50%  | Capital-intensive; DCA questionable |
| > 100% | Company burning through more cash than it earns on capex alone |

**Reference points:**
- Moody's: 5%, Coca-Cola: 19%, American Express: 23%, Altria: 20%, P&G: 28%
- Wrigley: 49% (borderline but still DCA)
- GM: 444% more than earnings, Goodyear: 950% more — funded by debt

#### 23. Stock Buybacks History
- Check "Issuance (Retirement) of Stock, Net" in the financing activities section.
- **Consistent, year-after-year buybacks = strong DCA indicator.**
- Companies buy back shares only when they have excess free cash flow.

#### 24. Free Cash Flow
- Operating Cash Flow − Capital Expenditures = Free Cash Flow
- DCA companies generate substantial, growing free cash flow.
- Negative or shrinking free cash flow over multiple years = serious concern.

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### PART 4: VALUATION — THE EQUITY BOND FRAMEWORK

Buffett treats shares of DCA companies as **"equity bonds"** — the earnings per share are like the coupon payment on a bond, but one that grows every year.

#### Initial Yield Calculation
**Formula:** EPS (pretax) ÷ Purchase Price = Initial Pretax Yield

- Think of this like a bond yield: you're buying $X of pretax earnings per dollar invested.
- Then project earnings growth forward at the historical rate (use 10-year average EPS growth).

#### Capitalized Value (What Is the Stock Worth?)
**Formula:** Annual pretax EPS ÷ Current long-term corporate bond rate = Intrinsic value per share

- If pretax EPS is $3.96 and corporate bonds yield 6.5%: $3.96 ÷ 0.065 = $60/share intrinsic value.
- Compare this to the current stock price.

#### When to Buy
- **Bear markets** — even DCA companies fall in broad selloffs; lower price = higher initial yield.
- **One-time solvable problems** — great business + temporary issue (New Coke, scandal, etc.) = buying opportunity. Key word: *solvable*.
- When the company's stock price implies a yield that is attractive relative to other long-term investments.
- Avoid: Peak bull markets when P/E ratios reach 40+ on DCA companies.

#### When to Sell
1. When you find a significantly better opportunity at a better price.
2. When the company appears to be losing its DCA (e.g., newspapers when internet disrupted them).
3. When P/E reaches 40+ in a raging bull market — consider rotating to Treasuries and waiting.
4. **Default position: Never sell.** The longer you hold a true DCA company, the better your compounding return. Selling also triggers taxes, which destroys compounding.

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## Summary Scorecard

Use this checklist when analyzing a company. The more checks, the stronger the DCA signal:

### Income Statement ✓
- [ ] Gross profit margin consistently ≥ 40% over 10 years
- [ ] SGA expenses as % of gross profit ≤ 80% and stable
- [ ] Little or no R&D expense
- [ ] Low depreciation as % of gross profit (< 15%)
- [ ] Interest expense < 15% of operating income (for non-financials)
- [ ] Net earnings margin consistently > 20%
- [ ] EPS shows consistent upward trend over 10 years (no large losses)
- [ ] Income taxes paid ≈ 35% of pre-tax earnings (integrity check)

### Balance Sheet ✓
- [ ] Large cash pile built from operations, not debt
- [ ] Inventory grows in tandem with net earnings
- [ ] Long-term debt payable in < 4 years of net earnings
- [ ] Little or no long-term debt on balance sheet for 10 years
- [ ] Growing retained earnings year-over-year
- [ ] Presence of treasury stock / history of buybacks
- [ ] ROE consistently > 15–20% (verify it's not from leverage)
- [ ] Adjusted debt/equity < 0.80 (non-financials)
- [ ] No preferred stock

### Cash Flow ✓
- [ ] Capital expenditures < 25% of net earnings (10-year average)
- [ ] Consistent stock buyback program
- [ ] Growing positive free cash flow

### Valuation ✓
- [ ] Initial pretax yield is attractive relative to corporate bond yields
- [ ] Capitalized value (EPS ÷ bond rate) exceeds current market price
- [ ] P/E ratio is not at historic highs (avoid P/E > 40)
- [ ] Business has a one-time solvable problem (opportunistic entry)

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## Red Flags — Companies to Avoid

- High, volatile, or rising R&D expense (patent cliffs, tech disruption risk)
- Consistent losses or erratic per-share earnings history
- Long-term debt that would take more than 5 years of earnings to repay
- Capital expenditures exceeding net earnings
- SGA expenses near or above 100% of gross profit
- Declining or negative retained earnings from losses
- Heavy use of short-term debt to fund long-term assets
- Frequent issuance of new shares (diluting existing shareholders)
- EBITDA-focused management communication ("EBITDA is stupid" — Buffett)

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## How to Use This Skill

When a user asks you to analyze a company:

1. **Ask for the data** if not provided: Request 10 years of income statements, balance sheets, and cash flow statements. Alternatively, use public sources (SEC EDGAR 10-K filings, Yahoo Finance, Macrotrends.net).

2. **Work through each section** of this framework systematically.

3. **Calculate the key ratios** listed above for each available year — consistency is more important than any single year's number.

4. **Render a verdict** on whether the company shows signs of a durable competitive advantage, explaining which indicators support or contradict the thesis.

5. **Provide a valuation estimate** using the equity bond framework if data permits.

6. **Be explicit about uncertainties** — missing data, recent business model changes, or industries where the standard thresholds may not apply (financial institutions, asset-heavy industries, capital-light software).

Remember: The goal is not to find the cheapest stock, but to find the *best business* at a *fair price* — one you'd be comfortable owning for 20 years.