Home › Library › Capital Structure & Cost of Capital
JAIIB Paper 3 • Accounting & Financial Management for Bankers (AFM) ⭐⭐⭐⭐⭐

Capital Structure & Cost of Capital

How firms decide their debt-equity mix, and the single number — WACC — that summarises what all that capital actually costs. This guide covers Leverage/Gearing, Factors Influencing Capital Structure, the NI/NOI/Traditional theories, Taxation's impact, Cost of Debt/Preference/Equity, WACC, Weighted Marginal Cost of Capital, Optimal Capital Budget, and Floatation Cost — with a free WACC calculator and 50 exam-style MCQs with hidden answers.

📅 Updated: September 2026 • 29 min read

1 Meaning of Capital Structure

🏗ī¸
Definition

Capital Structure is the mix of a firm's long-term sources of finance — debt, preference capital, and equity — used to fund its assets. Capital Structuring is the process of deciding the optimal proportion of each.

2 Leverage / Gearing

⚖ī¸
Definition

Financial Leverage (Gearing) is the use of debt to magnify returns to equity shareholders — sometimes called "trading on equity." If return on investment exceeds the cost of debt, leverage boosts ROE; if not, it magnifies losses.

JAIIB tip: Higher leverage raises financial risk (fixed interest obligations regardless of performance) even while it can raise expected ROE — the classic risk-return trade-off applied to capital structure.

3 Factors Influencing Capital Structure

Business Risk

Volatile-earnings businesses should use less debt.

Tax Considerations

Interest is tax-deductible, favouring debt over equity.

Control Considerations

Promoters may prefer debt to avoid diluting ownership/control via fresh equity.

Asset Structure

Firms with tangible, collateralisable assets can support more debt.

4 Theories of Capital Structure

TheoryCore Claim
Net Income (NI) ApproachDebt is always cheaper than equity — more debt continuously lowers WACC and raises firm value (implying near-100% debt is optimal).
Net Operating Income (NOI) ApproachOverall cost of capital is constant regardless of capital structure — capital structure is irrelevant to firm value.
Traditional ApproachA moderate, optimal mix of debt exists — WACC first falls, then rises as leverage increases, tracing a U-shaped curve.
JAIIB tip: Both the NI and NOI approaches rest on simplifying assumptions — no taxes, no transaction costs, and perfect capital markets — which is why the more balanced Traditional Approach is generally regarded as the most realistic.

5 Taxation and Capital Structure

Because interest is tax-deductible while dividends are not, debt enjoys a built-in "tax shield" that lowers its effective cost — making a debt-inclusive capital structure generally cheaper than an all-equity one, up to the point where rising financial distress risk offsets this tax advantage.

6 Cost of Debt, Preference and Equity

Cost of Debt (Kd) = Interest Rate × (1 − Tax Rate) The after-tax cost, since interest enjoys a tax shield
Cost of Preference (Kp) = Preference Dividend ÷ Net Proceeds No tax adjustment, since dividends are not tax-deductible
Cost of Equity (Ke) = D1 ÷ P0 + g  (Dividend Growth Model) Alternatively estimated via CAPM: Ke = Rf + β(Rm − Rf)

7 Weighted Average Cost of Capital (WACC)

WACC = WeKe + WpKp + WdKd(1−t) W = weight (proportion) of each capital source, ideally at market value

WACC is the blended, average cost of all a firm's capital sources — the minimum return a firm's investments must earn to satisfy all its capital providers.

8 Factors Affecting WACC & Marginal Cost of Capital

Capital Structure Changes

Shifting the debt-equity mix directly changes WACC.

Market Interest Rates

Rising rates raise the cost of new debt.

Credit Rating

A downgrade raises the required return on both debt and equity.

Weighted Marginal Cost of Capital (WMCC)

The cost of the next rupee of capital raised — rises once cheaper sources (like retained earnings) are exhausted and costlier new equity/debt must be tapped.

9 Optimal Capital Budget, Floatation Cost & Misconceptions

Optimal Capital Budget

The point where the Investment Opportunity Schedule (projects ranked by IRR) intersects the WMCC — accept all projects with IRR above WMCC.

Floatation Cost

Costs of issuing new securities (underwriting fees, etc.) — reduces net proceeds and raises the effective cost of new capital.

JAIIB tip — a common misconception: WACC is not a universal hurdle rate for every project a firm considers. It reflects the firm's average risk — projects materially riskier or safer than the firm's typical business should be evaluated using a risk-adjusted discount rate, not the plain WACC.

🧮 WACC Calculator

Enter your capital structure and component costs to compute the Weighted Average Cost of Capital.

Capital Structure

Results

Weight of Equity—
Weight of Debt—
After-Tax Cost of Debt—
WACC—

✓ Key Takeaways

  • Financial Leverage magnifies both returns and risk to equity shareholders through the use of debt.
  • The Traditional Approach is the most realistic capital structure theory, positing a U-shaped WACC curve with a genuine optimal mix — unlike the extreme NI and NOI theories.
  • Interest's tax deductibility makes debt's after-tax cost lower than its stated rate: Kd × (1−t).
  • WACC blends the after-tax cost of debt with the cost of preference and equity, weighted by market value proportions.
  • WACC should not be applied blindly to every project — it reflects average firm risk, not project-specific risk.

📝 Top 50 JAIIB-Style MCQs on Capital Structure & Cost of Capital

Test your understanding with these 50 practice MCQs, closely modelled on the pattern expected in the JAIIB AFM exam — including combination-answer questions. Each question has 5 options — the correct answer is hidden by default; tap "Show Answer" to reveal it along with a short explanation.

🏗ī¸ Meaning of Capital Structure
1 Capital Structure refers to the mix of a firm's:
A. Current assets only
B. Long-term sources of finance — debt, preference and equity
C. Short-term trade payables
D. Inventory holding
E. Contingent liabilities
Answer: B. Capital Structure is the mix of long-term financing sources.
2 "Capital Structuring" is the process of:
A. Deciding the optimal proportion of debt, preference and equity
B. Preparing the Trial Balance
C. Filing GST returns
D. Auditing fixed assets
E. Reconciling bank statements
Answer: A. Capital Structuring decides the optimal financing mix.
3 Which of the following are components of Capital Structure? (i) Equity (ii) Preference Capital (iii) Long-term Debt
A. (i) only
B. (i) and (ii) only
C. (iii) only
D. All of (i), (ii) and (iii)
E. None of these
Answer: D. All three are Capital Structure components.
4 Capital Structure decisions primarily fall under which broader financial decision?
A. Investment Decision
B. Financing Decision
C. Dividend Decision
D. Working Capital Decision
E. Audit Decision
Answer: B. Capital Structure falls under the Financing Decision.
5 Short-term trade payables and bank overdrafts are generally:
A. Included in Capital Structure analysis
B. Excluded from Capital Structure, which focuses on long-term sources
C. The only components of Capital Structure
D. Irrelevant to any financial decision
E. A form of equity
Answer: B. Capital Structure focuses on long-term sources only.
⚖ī¸ Leverage / Gearing
6 Financial Leverage is the use of:
A. Debt to magnify returns to equity shareholders
B. Only equity, with no debt
C. Inventory to boost sales
D. Fixed assets to reduce tax
E. Cash reserves only
Answer: A. Financial Leverage uses debt to magnify equity returns.
7 "Trading on equity" refers to:
A. Selling equity shares on a stock exchange
B. Using debt to boost the return earned by equity shareholders
C. Issuing bonus shares
D. Buying back shares
E. Paying dividends in shares
Answer: B. Trading on equity means using debt to boost equity returns.
8 Leverage boosts ROE when:
A. Return on investment exceeds the cost of debt
B. Return on investment is below the cost of debt
C. The firm has zero debt
D. Interest rates are irrelevant
E. The firm makes a loss always
Answer: A. ROI exceeding cost of debt is when leverage helps ROE.
9 Higher financial leverage generally means:
A. Lower financial risk
B. Higher financial risk, due to fixed interest obligations
C. No risk at all
D. Guaranteed higher profit always
E. Zero interest cost
Answer: B. Higher leverage raises financial risk.
10 A firm with volatile, unpredictable earnings should generally use:
A. More debt
B. Less debt (lower leverage)
C. Only preference shares
D. 100% debt financing
E. No equity at all
Answer: B. Volatile earnings warrant lower leverage.
đŸŽ¯ Factors Influencing Capital Structure
11 Interest being tax-deductible generally makes debt:
A. More expensive than equity in every case
B. Relatively cheaper than equity, all else equal
C. Irrelevant to capital structure
D. Illegal to use
E. Identical in cost to equity always
Answer: B. Tax deductibility makes debt relatively cheaper.
12 Promoters wishing to avoid dilution of control tend to prefer:
A. Fresh equity issuance
B. Debt financing
C. Selling the entire company
D. Issuing bonus shares only
E. Liquidation
Answer: B. Debt avoids dilution, unlike fresh equity.
13 Firms with substantial tangible fixed assets can generally support:
A. Less debt, since assets can't be pledged
B. More debt, since assets serve as collateral
C. No debt whatsoever
D. Only preference capital
E. Only short-term loans
Answer: B. Tangible assets support more debt as collateral.
14 Which of these are factors influencing capital structure? (i) Business risk (ii) Tax considerations (iii) Control considerations
A. (i) only
B. (i) and (ii) only
C. (iii) only
D. All of (i), (ii) and (iii)
E. None of these
Answer: D. All three are genuine influencing factors.
15 Market conditions (e.g., a booming stock market) may make it easier and cheaper for a firm to raise:
A. Debt only
B. Equity capital
C. Neither debt nor equity
D. Only government grants
E. Only bank overdrafts
Answer: B. Favourable markets ease equity fundraising.
📐 Theories of Capital Structure
16 The Net Income (NI) Approach suggests that firm value is maximised at:
A. Zero debt
B. Maximum possible debt (near 100%)
C. Exactly 50:50 debt-equity
D. Firm value is unaffected by debt
E. Only preference capital
Answer: B. NI Approach implies maximum debt is optimal.
17 The Net Operating Income (NOI) Approach claims that:
A. Capital structure directly determines firm value
B. Overall cost of capital is constant regardless of capital structure
C. 100% debt is always optimal
D. Equity is always cheaper than debt
E. Taxes have no relevance whatsoever
Answer: B. NOI claims overall cost of capital is constant.
18 The Traditional Approach to capital structure posits a WACC curve that is:
A. Perfectly flat (constant)
B. U-shaped, with a genuine optimal point
C. Continuously falling with more debt
D. Continuously rising with more debt
E. Irrelevant to firm value
Answer: B. Traditional Approach posits a U-shaped WACC curve.
19 The NI and NOI approaches share which common simplifying assumption?
A. Perfect capital markets, no taxes, no transaction costs
B. High transaction costs always
C. Government-controlled interest rates
D. Mandatory 100% equity financing
E. No investors exist in the market
Answer: A. Both assume perfect markets with no taxes/transaction costs.
20 Which theory is generally regarded as the most realistic for practical capital structure decisions?
A. Net Income Approach
B. Net Operating Income Approach
C. Traditional Approach
D. None of these are used in practice
E. Only the Agency Theory
Answer: C. The Traditional Approach is regarded as most realistic.
💰 Taxation and Capital Structure
21 Which of these enjoys tax deductibility, favouring debt over equity?
A. Dividend payments
B. Interest payments
C. Bonus share issuance
D. Share buybacks
E. Retained earnings
Answer: B. Interest payments are tax-deductible.
22 Because of the interest tax shield, a firm's effective cost of debt is:
A. Higher than its stated interest rate
B. Lower than its stated interest rate
C. Exactly equal to its stated interest rate always
D. Unrelated to the interest rate
E. Zero regardless of the rate
Answer: B. The tax shield lowers the effective cost of debt below the stated rate.
23 Dividend payments to shareholders are:
A. Fully tax-deductible for the paying company
B. Not tax-deductible for the paying company
C. Identical in tax treatment to interest
D. Always exempt from any tax
E. Deducted before computing net profit always
Answer: B. Dividends are not tax-deductible.
24 With taxes considered, moderate use of debt generally:
A. Increases WACC
B. Decreases WACC, up to a point
C. Has no effect on WACC
D. Eliminates the need for equity entirely
E. Increases tax liability without limit
Answer: B. Moderate debt lowers WACC due to the tax shield, up to a point.
25 The tax benefit of debt is eventually offset by:
A. Rising financial distress risk/costs at high leverage
B. A reduction in corporate tax rates to zero
C. The elimination of the interest tax shield entirely
D. Nothing; debt's tax benefit is unlimited
E. Equity becoming tax-deductible
Answer: A. Rising financial distress risk offsets the tax benefit at high leverage.
đŸ’ĩ Cost of Debt, Preference and Equity
26 Cost of Debt (after tax) is calculated as:
A. Interest Rate × (1 − Tax Rate)
B. Interest Rate × Tax Rate
C. Interest Rate Ãˇ Tax Rate
D. Interest Rate + Tax Rate
E. Interest Rate alone, with no tax adjustment
Answer: A. Kd = Interest Rate × (1 − Tax Rate).
27 Cost of Preference Capital is calculated as:
A. Preference Dividend Ãˇ Net Proceeds
B. Preference Dividend × Tax Rate
C. Preference Dividend × (1 − Tax Rate)
D. Net Proceeds Ãˇ Preference Dividend
E. Face Value Ãˇ Market Price
Answer: A. Kp = Preference Dividend Ãˇ Net Proceeds.
28 Under the Dividend Growth Model, Cost of Equity is:
A. D1 Ãˇ P0 + g
B. D1 × P0 − g
C. P0 Ãˇ D1
D. g Ãˇ D1
E. D1 − P0
Answer: A. Ke = D1 Ãˇ P0 + g under the Dividend Growth Model.
29 CAPM estimates Cost of Equity as:
A. Rf + β(Rm − Rf)
B. Rf − β(Rm − Rf)
C. Rm Ãˇ Rf
D. β Ãˇ Rf
E. Rf × Rm
Answer: A. CAPM: Ke = Rf + β(Rm − Rf).
30 Cost of Preference Capital does NOT receive a tax adjustment because:
A. Preference dividends are not tax-deductible
B. Preference capital doesn't exist in India
C. It is treated identically to debt
D. Tax rates don't apply to companies
E. Preference shares carry no dividend at all
Answer: A. Preference dividends aren't tax-deductible, so no adjustment.
📊 Weighted Average Cost of Capital (WACC)
31 WACC blends the cost of:
A. Only debt
B. Equity, preference and debt, weighted by their proportions
C. Only equity
D. Only current liabilities
E. Only inventory financing
Answer: B. WACC blends equity, preference and debt costs.
32 Weights in WACC are ideally based on:
A. Book value only, never market value
B. Market value of each capital source
C. Face value of shares only
D. Historical cost only
E. Tax rate only
Answer: B. Market value weights are the ideal, though book value is sometimes used.
33 WACC represents:
A. The minimum return a firm's investments must earn to satisfy all capital providers
B. The maximum possible return achievable
C. The tax rate applicable to the firm
D. Only the cost of equity
E. The GST rate on the firm's products
Answer: A. WACC is the minimum required return for all capital providers.
34 In the WACC formula, the debt component uses:
A. The pre-tax cost of debt
B. The after-tax cost of debt
C. The cost of equity instead
D. Zero cost always
E. The GST rate
Answer: B. WACC uses the after-tax cost of debt.
35 If a firm is entirely equity-financed, its WACC equals:
A. Zero
B. Its Cost of Equity
C. Its Cost of Debt
D. The tax rate
E. Cannot be determined
Answer: B. An all-equity firm's WACC equals its Cost of Equity.
📈 Factors Affecting WACC & Marginal Cost of Capital
36 WMCC stands for:
A. Weighted Marginal Cost of Capital
B. Working Money Circulation Cost
C. Working Margin Compliance Cost
D. World Market Currency Conversion
E. Weighted Market Cost Coverage
Answer: A. WMCC = Weighted Marginal Cost of Capital.
37 WMCC represents the cost of:
A. The firm's entire existing capital base
B. The next additional rupee of capital raised
C. Only retained earnings
D. Only preference capital
E. The firm's tax liability
Answer: B. WMCC is the cost of the next rupee raised.
38 WMCC typically rises once:
A. Cheaper sources like retained earnings are exhausted
B. The firm stops raising capital entirely
C. Tax rates fall to zero
D. Interest rates fall to zero
E. The firm becomes debt-free
Answer: A. WMCC rises once cheap sources like retained earnings run out.
39 A credit rating downgrade for a firm would typically:
A. Lower its WACC
B. Raise its WACC, via higher required returns on debt and equity
C. Have no effect on WACC
D. Eliminate the need for equity
E. Automatically reduce its tax rate
Answer: B. A downgrade raises WACC via higher required returns.
40 Rising market interest rates generally cause a firm's WACC to:
A. Fall
B. Rise, via the higher cost of new debt
C. Remain exactly unchanged
D. Become negative
E. Have no relation to WACC
Answer: B. Rising rates raise WACC via costlier new debt.
đŸŽ¯ Optimal Capital Budget, Floatation Cost & Misconceptions
41 The Optimal Capital Budget is found where:
A. The Investment Opportunity Schedule intersects the WMCC curve
B. Tax rates equal interest rates
C. WACC equals zero
D. All projects have identical IRR
E. Equity equals debt exactly
Answer: A. The IOS-WMCC intersection defines the Optimal Capital Budget.
42 A firm should accept projects whose IRR is:
A. Below WMCC
B. Above WMCC
C. Exactly zero
D. Unrelated to WMCC
E. Below the tax rate
Answer: B. Accept projects with IRR above WMCC.
43 Floatation Cost refers to:
A. The cost of issuing new securities, such as underwriting fees
B. The cost of paying dividends
C. The cost of repaying old debt
D. A form of tax refund
E. The cost of statutory audit
Answer: A. Floatation Cost is the cost of issuing new securities.
44 Floatation Cost affects cost of capital by:
A. Reducing net proceeds and raising the effective cost of new capital
B. Having no effect whatsoever
C. Lowering the effective cost of new capital
D. Eliminating the need to raise capital
E. Only affecting the tax rate
Answer: A. Floatation cost reduces net proceeds, raising effective cost.
45 A common misconception about WACC is that it should be used as:
A. A universal hurdle rate for every project, regardless of its risk
B. Only a theoretical concept with no practical use
C. The tax rate applicable to the firm
D. The GST rate
E. A measure of liquidity
Answer: A. Using WACC blindly for every project regardless of risk is the misconception.
🔁 Comprehensive Review
46 A project riskier than the firm's average business should be evaluated using:
A. The plain, unadjusted WACC
B. A risk-adjusted discount rate higher than WACC
C. A discount rate of zero
D. The Cost of Preference Capital only
E. No discount rate at all
Answer: B. Riskier projects need a higher, risk-adjusted rate.
47 Divisional/Project Cost of Capital differs from firm-wide WACC because:
A. Different divisions/projects may carry different risk levels
B. All divisions always carry identical risk
C. Tax rates differ by division always
D. WACC never varies across a firm
E. There is no such concept as divisional cost of capital
Answer: A. Different risk levels justify divisional/project-specific costs of capital.
48 An all-debt (100%) capital structure is considered unrealistic mainly because of:
A. Rising financial distress and bankruptcy risk at extreme leverage
B. Debt being illegal beyond a certain amount
C. Zero tax benefit from debt
D. Equity being mandatory by law
E. No lender ever offering debt
Answer: A. Financial distress risk makes 100% debt unrealistic.
49 Which of these would raise a firm's cost of equity? (i) Higher beta (ii) Rising risk-free rate (iii) Falling market risk premium
A. (i) only
B. (i) and (ii) only
C. (iii) only
D. All of (i), (ii) and (iii)
E. None of these
Answer: B. Higher beta and higher risk-free rate both raise cost of equity; falling risk premium would lower it.
50 For JAIIB purposes, the single most important reason bankers study capital structure and WACC is to:
A. Assess a borrower's financial risk profile and appropriate return benchmarks
B. Set the GST rate for a borrower
C. Calculate the Bank Reconciliation Statement
D. Draft a Letter of Credit
E. Compute the borrower's KYC risk category
Answer: A. Assessing financial risk/leverage is the practical banking application.

Continue your JAIIB preparation on AskBanker.in

Explore related topics: our Capital Investment Decisions & Term Loans guide, our Financial Management & Ratio Analysis guide, our Term Loan Assessment tool, and the complete JAIIB / CAIIB Library on AskBanker.in.

Disclaimer: This article is prepared for educational and exam-preparation purposes only, as of September 2026. Candidates should cross-check the latest official IIBF syllabus and current notifications before the exam.
↑