Basic earnings per share is a dangerous illusion of profitability when evaluating unlisted or pre-IPO shares. To properly value a company you need to know exactly how many convertible bonds, stock options and warrants may dilute your future ownership.
Basic vs. Diluted EPS: Core Formulas and Differences in Capital Structure
To see how profitable a company actually is you need to look at its capital structure. Companies with “simple” capital structures have only standard common stock outstanding, so that earnings calculations are simple. But modern pre-IPO and unlisted companies almost always have “complex” capital structures.
These complex structures include financial instruments that are convertible into common shares at some future point. Growing companies have all the options: stock options (ESOPs), warrants and convertible debt. If these options are exercised, new shares are issued, increasing the total number of shares and reducing earnings per share.
Basic EPS does not consider this potential dilution at all. It is calculated by taking Net Income minus Preferred Dividends divided by the Weighted Average Common Shares Outstanding or WACSO. It is a snapshot of profitability based on the exact number of shares that exist today.
Diluted EPS includes all potential future shares. It re-calculates the share pool assuming all convertible instruments are exercised at once. Common share count must be adjusted for the exercise of all dilutive securities to present an accurate financial picture according to standard accounting practices.
Basic EPS vs Diluted EPS Comparison
| Metric | Denominator Used | Primary Use Case |
|---|---|---|
| Basic EPS | Current outstanding common shares only | Historical reporting of current state |
| Diluted EPS | Outstanding shares + all convertible/dilutive shares | Valuation modeling and investment analysis |
The Diluted EPS calculation employs two different accounting methods to find the true number of new shares, the Treasury Stock Method for options and warrants and the If-Converted Method for convertible debt. Both procedures replicate the mathematical fact of total dilution.
Calculating Dilution Impact on Shareholder Value (Step by Step)
To get a sense for how large the difference between these two metrics can be, we need to plug in a numerical example into the formulas. Consider a pre-IPO company looking at its financials for potential investors.
For example, suppose this company has a net income of ₹50 million and has 10 million common shares outstanding. The company has also convertible debt of ₹1,00,00,000 at an interest rate of 8% which can convert into 10,00,000 new shares. Additionally, employees have 5,00,000 stock options with a strike price of ₹50 and the current fair market value of a share is ₹100.
Step-by-Step Calculation
- Calculate Basic EPS: Divide the net income by the current outstanding shares.
Basic EPS = ₹5,00,00,000 / 1,00,00,000 shares = ₹5.00 per share
- Adjust the Numerator (If-Converted Method): If the convertible debt is converted to equity, the company no longer pays interest on that debt, which technically increases net income. Interest expense of ₹8,00,000 adjusted for corporate tax of 25% results in an add-back of ₹6,00,000. The net income has been revised to ₹5,06,00,000.
- Adjust the Denominator (Treasury Stock Method): The company receives cash of ₹2,50,00,000 when the employees exercise their 5,00,000 options at ₹50. Under the Treasury Stock Method, we assume the company uses this exact cash to buy back shares at ₹100 market price, resulting in 2,50,000 shares being repurchased. Less this from gross options and we are left with 2,50,000 net new dilutive shares.
- Calculate Final Diluted EPS: Add the 10,00,000 shares from the convertible debt and the 2,50,000 net new shares from options to the original 1,00,00,000 shares outstanding. The new denominator becomes 1,12,50,000 shares. Divide the adjusted net income of ₹5,06,00,000 by this new denominator to arrive at a Diluted EPS of ₹4.49.
In this case, basic reporting results in a profit of ₹5.00 per share. The economic reality is ₹4.49 per share assuming full dilution.
This is a fall of 10.2% in earnings per share, entirely as a result of the company’s capital structure. If you are a retail investor investigating pre-IPO allocations, to ignore this 10% difference is to have fundamentally flawed portfolio mathematics.
P/E Ratio Calculation: What EPS Should Investors Use for Valuation?
The most important multiple that investors use to determine whether an asset is over or under-valued is the Price-to-Earnings (P/E) ratio. The choice between Basic and Diluted EPS changes the perceived valuation because the P/E ratio is calculated by dividing the current share price by the Earnings Per Share.
Let’s say the pre-IPO shares for the hypothetical company in the previous section are priced at ₹150. If the investor uses the Basic EPS of ₹5.00, the computed P/E ratio is exactly 30x. So, the P/E ratio expands to 33.4x if the investor uses the Diluted EPS of ₹4.49 correctly. The investor is wrongly thinking they are getting shares at 30x on a simple metrics basis, when they are actually paying an 11% premium for the fully diluted asset.
Diluted EPS gives a more complete and conservative outlook on profitability per share. When considering alternative investments this conservative perspective is not discretionary, it is mandatory. Pre-IPO and unlisted companies typically have a large pool of ESOPs to retain early talent. Convertible notes are also a common financing vehicle for early-stage rounds. Generally the spread between Basic and Diluted EPS is much larger when viewing these particular assets than it is with mature, publicly traded blue-chip stocks. The diluted EPS is used to calculate the P/E ratio so that investors do not pay a premium based on an inflated earnings baseline.
Basic EPS vs Diluted EPS: Which Is Better For Investors?
For investors who are looking to value an asset before they buy it, diluted EPS is definitely the better measure. It provides for the worst case dilution scenario and gives you a built in margin of safety.
Basic EPS has limited use other than for accounting departments that need to report historical, point-in-time financial statements to regulators. That is a correct description of what happened in the past quarter, but it is a lagging indicator of future equity structure.
Diluted EPS is economic reality for active investment decisions. It makes sure you fully grasp how employee options and institutional convertible debt will eventually dilute your percentage ownership. Basic EPS as the only measure blinds investors to any impending structural changes in the pool of shares.
Can Diluted EPS Be Higher Than Basic EPS?
That seems to go against conventional wisdom, but there are some mathematical situations where the issuance of convertible securities actually raises the earnings per share. And these are known as “anti-dilutive” securities. Typically, this is the case with convertible debt. Anything saved by the company in interest expense by converting the debt is greater on a per-share basis than the new shares created, the resulting EPS calculation will go up.
However, accounting rules for corporations prohibit the use of anti-dilutive securities in Diluted EPS calculations for official reporting purposes. If the conversion raises the EPS, accountants would have to exclude that particular security from the formula. This strict anti-dilutive exclusion rule puts a mathematical cap on Diluted EPS. It may be the same as Basic EPS if a company has a very simple capital structure with no convertibles, but it may never be reported as higher than Basic EPS by law.
Disclaimer
This article is intended for educational and informational purposes only and should not be construed as investment or financial advice. Investors should evaluate their individual circumstances and consult a qualified financial advisor before making any investment decisions regarding unlisted or pre-IPO shares.
