Advanced Financial Management · Valuation for acquisitions and mergers

Market-Based Valuation: P/E Ratio and Earnings Yield for ACCA AFM

Updated 11 October 2026 · Fact-checked

Market-based valuation estimates a target's value from how the market prices similar companies. Equity value = maintainable earnings × P/E ratio. Earnings yield is the inverse of the P/E (earnings ÷ value). Choose a comparable P/E, adjust it for risk and growth, and apply it to the target's earnings.

Understand Market-Based Valuation: P/E and Earnings Yield

A market-based valuation asks one question: what does the market pay for each rupee, dollar or pound of earnings in similar companies? You then apply that price to your target's earnings.

The price-earnings (P/E) ratio is share price ÷ earnings per share (EPS). Equivalently, it is total market capitalisation ÷ total earnings. A P/E of 12 means investors pay 12 times annual earnings. The earnings yield is the inverse: EPS ÷ share price. A P/E of 12.5 gives an earnings yield of 8%.

To value a target, you take a P/E from a comparable listed company or from the sector average. You apply it to the target's maintainable earnings, meaning earnings after tax and after removing one-off items. The result is the equity value. Divide by the number of shares for a value per share.

The comparable's P/E rarely fits exactly. A higher P/E reflects higher expected growth or lower risk. So you adjust. If the target is riskier, smaller, or unlisted, reduce the P/E. A discount for an unlisted target is often applied to reflect illiquidity. The size of the discount is a judgement, so state it and justify it. If the target has stronger growth prospects, you may justify a higher P/E.

This method is quick but crude. It relies on current earnings, which accounting policies can distort. It assumes the comparable is truly similar. It also uses a market price that may itself be over- or under-valued. In an acquisition, the P/E gives a starting value. Synergies and a bid premium come on top, so treat it as a check on other methods, not the final price.

Key rules to remember

P/E ratio: P/E = market price per share ÷ EPS = market capitalisation ÷ total earnings; Use earnings after tax and after preference dividends.
Earnings yield: Earnings yield = EPS ÷ share price = 1 ÷ P/E; A P/E of 8 gives an earnings yield of 12.5%.
Equity value using P/E: Equity value = maintainable earnings × P/E ratio; Divide by the number of shares for a value per share.
Equity value using earnings yield: Equity value = maintainable earnings ÷ earnings yield; Gives the same answer as the P/E method.
Enterprise value multiple: Enterprise value = equity value + debt − cash; EV/EBITDA = EV ÷ EBITDA; Useful when capital structures differ. Convert EV back to equity by deducting net debt.
Link between P/E and growth: P/E ≈ payout ratio × (1 + g) ÷ (ke − g); Applies when dividends grow at constant rate g and earnings are the base. It shows why higher growth and lower risk raise P/E.

How to solve Market-Based Valuation: P/E and Earnings Yield questions

Use this order for any market-based valuation question. Show each step, because marks are given for method and for judgement.

1Identify the target's maintainable earnings. Start with profit after tax and remove one-off gains, one-off costs and any items that will not continue.
2Deduct preference dividends if you are valuing ordinary equity.
3Select the comparable P/E or earnings yield. Use a close competitor or sector average, and note that it comes from listed companies.
4Adjust the P/E for differences in risk, size, growth, gearing and liquidity. State the adjustment and the reason, for example a 20% discount for an unlisted company.
5Multiply earnings by the adjusted P/E, or divide by the adjusted earnings yield, to get equity value.
6Convert to value per share if required, and compare with the current share price or the offer price to show the premium.
7Comment on limitations and on synergies. Say what the answer means for the bid decision.

Quickest way: Earnings × adjusted P/E in four lines

When to use it: Use when the question gives one comparable P/E and asks for a quick target value, or when you need a cross-check against a DCF.

Write earnings after tax and strip out one-offs.
Write the comparable P/E, then the adjusted P/E with a one-line reason.
Multiply to get equity value, then divide by shares for price per share.
Add one sentence on reliability, for example that the comparable may not be a perfect match.

Common mistakes in Market-Based Valuation: P/E and Earnings Yield

Using the acquirer's P/E to value the target without comment.
It is the only P/E given in the data.
Fix: Say that the acquirer's P/E reflects its own risk and growth. Use it only if the target is similar, and adjust or explain otherwise.
Using profit before tax or profit before interest as earnings.
The first profit line in the data is picked up without checking.
Fix: Use profit after tax and after preference dividends for an equity P/E. Use EBITDA only with an EV multiple.
Not removing one-off items from earnings.
Students focus on the calculation and skip the scenario detail.
Fix: Read the scenario for exceptional gains, closures or restructuring costs. Adjust earnings and say why.
Confusing earnings yield with P/E, and multiplying by yield.
Both are shown as comparables and look alike.
Fix: Remember yield = 1 ÷ P/E. Divide earnings by the yield, or multiply by the P/E.
Giving a single figure with no judgement on risk, growth or liquidity.
The number feels like the whole answer.
Fix: State the adjustment, give a reason and note limitations. Professional skills marks reward analysis and commercial judgement.
Applying an EV multiple and quoting the result as equity value.
The last step of deducting net debt is forgotten.
Fix: Always deduct debt and add cash after applying EV/EBITDA to reach equity value.

Worked examples

Example 1

Target Co is unlisted. Profit after tax is $6.0 million, which includes a one-off after-tax gain of $0.8 million. It has 10 million shares. A listed competitor has a P/E of 14. Because Target Co is unlisted and smaller, you decide to apply a 25% discount to the P/E. Value Target Co's equity and each share.

Show the solution

Maintainable earnings = 6.0 − 0.8 = $5.2 million.
Adjusted P/E = 14 × (1 − 0.25) = 10.5.
Equity value = 5.2 × 10.5 = $54.6 million.
Value per share = 54.6 ÷ 10 = $5.46.

Answer: Equity value is $54.6 million, or $5.46 per share. This is a starting value before any synergies or bid premium. The 25% discount is a judgement and the value is sensitive to it.

Example 2

Bidder plc is considering buying Tiny Ltd. Tiny's earnings after tax are $3.0 million. Listed companies in the sector have an average earnings yield of 8%. Tiny has higher growth prospects than the sector, and you decide that an earnings yield of 7.5% is appropriate. It has 4 million shares. Value Tiny and compare with an offer of $11 per share.

Show the solution

Equity value = earnings ÷ earnings yield = 3.0 ÷ 0.075 = $40.0 million.
Value per share = 40.0 ÷ 4 = $10.00.
Offer of $11 is above the estimated value by 11 − 10 = $1 per share.
Premium over estimated value = 1 ÷ 10 = 10%.

Answer: Tiny is worth about $40.0 million, or $10.00 per share. The $11 offer is a 10% premium over this estimate. Bidder should only pay it if synergies justify the extra cost. The lower yield reflects higher growth, which is the main judgement.

Exam tips

Always state why you adjusted the P/E. The reasoning earns marks as well as the arithmetic.
Check the earnings line. Look for one-offs, preference dividends and exceptional items before you multiply.
Give a range if the data allows it, such as using two comparable P/Es, and recommend a figure within it.
Add limitations in one or two sentences: reliance on one year of earnings, comparability, and market mispricing.
If the question asks for a bid price, compare your value with the offer and link the gap to synergies.

Practice questions from Valuation for acquisitions and mergers

Market-Based Valuation: P/E and Earnings Yield in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Market-Based Valuation: P/E and Earnings Yield: frequently asked questions

How do I use the P/E ratio in a takeover valuation?

Take a P/E from a comparable listed company. Adjust it for the target's risk, growth and liquidity. Multiply by the target's maintainable earnings to get the equity value. Compare the result with the offer price.

What is the difference between P/E and earnings yield?

They are inverses. P/E is price ÷ EPS and earnings yield is EPS ÷ price. A P/E of 10 equals an earnings yield of 10%. Use whichever the question provides.

Why would I reduce the P/E for an unlisted target?

Unlisted shares are harder to sell, so investors pay less for them. The target may also be smaller and riskier. A discount is a judgement, so state the figure and justify it.

Can I use the acquirer's own P/E to value the target?

Only if the two companies have similar risk and growth. Otherwise the acquirer's P/E will misprice the target. Say so in your answer and adjust or use a better comparable.