Wednesday, 24 December 2025

Security Analysis: Principles & Technique by Benjamin Graham and David Dodd (Chapter 23 to 29)

 Part V – Analysis of the Income Account

17:32 – Start of Part V 19:50 – Chapter 23: The Significance of the Income Account 22:39 – Chapter 24: Extraordinary Losses and Profits 25:03 – Chapter 25: Misleading Artifices in the Income Account 27:52 – Chapter 26: Methods of Depreciation and Depletion 30:41 – Chapter 27: Amortization and Sinking Funds 33:16 – Chapter 28: Maintenance of Surplus Reserves 35:50 – Chapter 29: Relation of Depreciation to Maintenance


Here is a summary of Chapter 23: The Significance of the Income Account.

Summary of Chapter 23: The Significance of the Income Account

This chapter establishes the income account (or profit & loss statement) as the essential starting point for practical security analysis, while issuing a strong warning about its potential to mislead.

The Central Role:
The income account is the "heartbeat" of a company. It tells the financial story of how much money was earned (revenue), spent (expenses), and kept as profit. It is the primary source for determining a company's earnings power, which is the engine of intrinsic value.

The Critical Warning: "Appearances Can Be Deceiving"
Graham and Dodd stress that the numbers on an income statement are not pure facts. They can be "twisted, rearranged, or dressed up" to look better than reality. An investor who blindly trusts reported earnings is navigating with a "broken compass."

The Analyst's Core Task: Separation & Skepticism
The investor must become a detective, questioning the numbers to find the truth behind the report. The key is to separate:

  • Real, recurring profits from stable operations.

  • Temporary or illusory results caused by one-time events or accounting choices.

Why This Matters:
Since intrinsic value rests heavily on earnings, any distortion in the income account directly distorts the investor's estimate of value. Misreading profits can lead to paying too much for a weak business or overlooking a strong one.

The Dual Nature:
The chapter concludes that the income account is both:

  • Essential: It is the main source of earnings information.

  • Unreliable: It can be shaped by management and accounting methods.

Therefore, the wise investor treats it as a starting point for investigation, not the final word. The job is to analyze, adjust, and interpret the numbers to uncover the company's true, sustainable earning power.


Here is a summary of Chapter 24: Extraordinary Losses and Profits.

Summary of Chapter 24: Extraordinary Losses and Profits

This chapter teaches the analyst's first critical task when examining an income account: separating ordinary, recurring results from extraordinary, one-time events. This separation is essential to see a company's true earning power.

The Key Distinction:

  • Ordinary Items: Profits and losses from the company's regular, ongoing business activities. These repeat year after year and reflect the core operations.

  • Extraordinary Items: Unusual, non-recurring gains or losses that do not reflect normal business. Examples include profits from selling land, losses from natural disasters, or write-offs from bad investments.

Why the Separation Matters for Valuation:
Valuation depends on sustainable earning power. If extraordinary profits are counted as ordinary, the company will appear more profitable than it truly is. Conversely, overreacting to an extraordinary loss can make a healthy company seem weak. Both mistakes lead to poor investment decisions.

Management's Potential Artifice:
Graham and Dodd warn that management can use these items to manipulate perception:

  • They might hide weak operating performance behind a large, one-time asset sale gain.

  • They might "take a bath" by recording huge losses in one year (labeling them extraordinary) to make future years' results look cleaner by comparison.

The Analytical Discipline:
The investor must actively filter out the "noise" of extraordinary items. When analyzing earnings, these unusual gains or losses should be set aside to reveal the steady, underlying tune of normal operating performance.

The Core Lesson:
A company's intrinsic value is built on what it can earn steadily, not on one-time surprises. The analyst must be alert to these items to avoid being misled and to accurately assess the business's genuine financial strength.


Here is a summary of Chapter 25: Misleading Artifices in the Income Account.

Summary of Chapter 25: Misleading Artifices in the Income Account

This chapter exposes how companies can use accounting tricks and artifices to distort the income account, turning it from a clear window into a "painted glass" that obscures true performance.

The Core Warning:
Numbers can be twisted. Management may employ clever techniques to make earnings appear better (or worse) than economic reality, deliberately misleading investors.

Common Artifices Explained:
Graham and Dodd detail several manipulative practices:

  • Shifting Expenses: Delaying costs to boost current profits, or piling them into one year to make future years look stronger.

  • Inflating Revenues: Recording sales before they are earned or counting uncertain payments as guaranteed income, creating an illusion of growth.

  • Strategic Write-offs & Reserves: Taking large "non-recurring" write-offs to clean up past mistakes and make future results appear cleaner. If done repeatedly, it signals deeper operational weakness.

  • Manipulating Key Charges: Understating depreciation or creatively spreading out R&D costs to artificially inflate reported profits.

Consequences for the Investor:
Since investment decisions are based on reported earnings, manipulated numbers create an unstable foundation for intrinsic value. Trusting distorted figures leads to overpaying for weak companies or holding risky assets.

The Analyst's Duty – Active Detective Work:
This chapter reinforces that financial analysis is not a passive act. The analyst must:

  • Question reports, not accept them blindly.

  • Look for patterns (e.g., why did earnings suddenly improve?).

  • Test the substance behind glossy results to determine if gains came from real operations or "accounting creativity."

The Ultimate Caution:
Be suspicious when things look too perfect. This critical, skeptical mindset is essential before proceeding to analyze more technical areas like depreciation, which is the subject of the next chapter.


Here is a summary of Chapter 26: Methods of Depreciation and Depletion.

Summary of Chapter 26: Methods of Depreciation and Depletion

This chapter explains that depreciation (for man-made assets) and depletion (for natural resources) are real economic costs that must be properly accounted for, as they directly impact reported profits and intrinsic value.

The Economic Reality:
Assets wear out (machines, buildings) and resources are consumed (oil, minerals). If these costs are not fairly charged against earnings, the company is "living on borrowed time," as eventual replacement will require funds that haven't been set aside.

Key Methods & Their Impact:

  • Straight-Line: Spreading an asset's cost evenly over its life.

  • Accelerated: Loading more expense into the early years.
    Different methods change the pattern of reported earnings, even though the long-term economic cost is the same.

The Analyst's Critical Task:
The investor must check if these charges are reasonable.

  • Too little expense inflates profits, misleading investors about true profitability.

  • Too much expense can hide real earning power.
    Both distortions create a false picture of intrinsic value.

A Warning Against Manipulation:
Graham and Dodd stress these are not optional accounting entries but unavoidable facts of business. Companies that treat them honestly show respect for shareholders. Those that manipulate them—to smooth earnings or reduce taxes—are playing a dangerous game that ultimately misrepresents the company's health.

The Lesson:
To trust reported earnings, the analyst must ensure that the accounting for the wearing out of assets and resources is fair and realistic. This scrutiny is a prerequisite for accurate analysis.


Here is a summary of Chapter 27: Amortization and Sinking Funds.

Summary of Chapter 27: Amortization and Sinking Funds

This chapter examines two related practices—amortization and sinking funds—that deal with a company's long-term planning and prudence in meeting future obligations.

1. Amortization:

  • Purpose: The gradual repayment of debt or the systematic writing off of intangible assets (like patents or goodwill) over their useful life.

  • Logic: It spreads a large future cost or repayment into smaller, regular installments, reducing risk and avoiding a crushing single payment.

  • Importance for Analysis: If the cost of intangibles is ignored, earnings are overstated, making the business appear stronger than it truly is. Proper amortization aligns costs with the period of benefit.

2. Sinking Funds:

  • Purpose: A formal method to prepare for repaying long-term debt (like bonds). Instead of needing a large lump sum at maturity, the company sets aside money regularly into a dedicated fund.

  • Value to Investors: They offer a sense of security and reduce default risk by ensuring funds are being accumulated.

Critical Analyst's Check – Reality vs. Promise:
Graham and Dodd warn that not all sinking funds are equally safe. The analyst must verify: Is the fund made of real, segregated cash, or is it just an accounting promise? If the company can use the money for other purposes, the protection is illusory.

The Overarching Theme – Prudence:
Like depreciation, these practices highlight that a sound business doesn't just maximize current profits but plans for inevitable future obligations. Amortization anticipates maturing debts, and sinking funds ensure the means to repay them.

Connection to Cash Flow:
This analysis naturally leads to the next question: What is the real cash impact of all these charges (depreciation, depletion, amortization, sinking funds)? How do they affect the company's actual cash position, not just its accounting profits? This sets up the discussion in the following chapter.


Here is a summary of Chapter 28: Maintenance of Surplus Reserves.

Summary of Chapter 28: Maintenance of Surplus Reserves

This chapter analyzes surplus reserves—profits held back instead of paid out as dividends. It explores their dual nature as both a protective cushion and a potential tool for manipulation.

The Protective Purpose:
Reserves act as a financial cushion against future uncertainties like losses, accidents, or downturns. They allow a company to absorb shocks without collapsing, demonstrating management's foresight and prudence.

The Risk of Misuse:
Graham and Dodd warn reserves can be manipulated. Management might hold back excessive profits not for safety, but to artificially shrink reported earnings. This can make the company look less successful, potentially depressing the stock price to benefit insiders or conceal true performance.

The Analyst's Key Questions:
The investor must scrutinize reserves to distinguish prudence from artifice:

  • Is the reserve justified by genuine risks (e.g., equipment breakdown, lawsuits)?

  • Or is it a convenient way to hide real earnings?

The Principle of Balance:
A wise company maintains reserves that are reasonable in size—neither too small (leaving the firm exposed) nor too large (misrepresenting profits and depriving shareholders). The reserve should match the actual needs of the business.

The Household Analogy:
Reserves are likened to a household's emergency fund: essential for security, but if over-stuffed, they raise suspicion about what is being hidden.

Integration with Overall Analysis:
Reserves must be analyzed alongside dividends, earnings, and real financial risks to get a complete picture. This leads directly to the next critical issue: How do reserves connect to the actual physical maintenance of assets? Because reserves are meant to ensure the company's operational health, not just exist on paper.



Here is a summary of Chapter 29: Relation of Depreciation to Maintenance.

Summary of Chapter 29: Relation of Depreciation to Maintenance

This chapter connects the accounting concept of depreciation with the physical reality of asset maintenance, arguing that true financial health depends on both.

The Core Argument:
Depreciation is an accounting measure of asset wear and tear, but the real-world counterpart is maintenance—the actual spending on repairs, replacements, and upkeep. If a company records depreciation but neglects maintenance, its reported earnings are misleading and its long-term value is threatened.

The Danger of "Cash Flow Illusion":
A company can show high profits today by skimping on maintenance, but this "borrows from tomorrow." Eventually, it will face large, catch-up expenditures that erode future earnings, lower dividends, and can even threaten survival.

Warning on Depreciation Methods:
Accounting choices can disguise reality:

  • Straight-line depreciation might show steady profits while equipment wears out faster in practice.

  • Companies might overstate depreciation to reduce taxes, making profits appear lower than the actual cash flow.

The Analyst's Critical Task:
The investor must compare the depreciation recorded on the income statement with the actual capital expenditures and maintenance spending on the cash flow statement or in the notes. This reveals whether the company is truly reinvesting in its productive capacity.

The Ultimate Lesson:
Earnings are meaningful only if assets are properly maintained. True intrinsic value lies in a business's ability to sustain its operations at consistent quality and cost. Understanding this link is essential before moving to the balance sheet, which provides a snapshot of the company's overall financial structure.

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