Strategic Management and Corporate Finance · Project Evaluation

Project Financing and Social Cost Benefit Analysis Explained

Updated 11 October 2026 · Fact-checked

Project financing means funding a project from equity, debt and other sources, and checking that its cash flows can repay lenders. DSCR = net operating cash available ÷ debt service (interest + principal). Social cost benefit analysis judges a project by its value to society, using UNIDO or Little-Mirrlees methods.

Understand Project Financing and Social Cost Benefit Analysis

A project needs money before it earns any. Project financing is the plan for raising that money. The usual sources are promoters' equity, preference capital, term loans from banks and financial institutions, debentures, subsidies and incentives, venture capital or private equity, external commercial borrowings, and internal accruals. Lenders look at the project's own cash flows to judge whether they will be repaid.

The key lender test is the Debt Service Coverage Ratio (DSCR). It compares the cash the project generates in a year with the cash needed to pay interest and instalments of principal in that year. A DSCR above 1 means the project covers its debt payments. Lenders usually want a comfortable margin above 1, and the exact level they ask for depends on the lender and the sector. Do not state one figure as a fixed rule in the exam; say it is the lender's norm.

A private appraisal uses market prices and looks at the investor's profit. A social cost benefit analysis (SCBA) asks a wider question: does the project add to national welfare? Market prices can be distorted by taxes, subsidies, controls, unemployment and a scarce foreign exchange. SCBA corrects for these by using adjusted prices, often called shadow prices, and by considering income distribution and savings.

Two classic approaches are taught. The UNIDO approach values everything in terms of consumption (present or future) at domestic prices. It moves in stages: first calculate the net benefit at market prices, then adjust to shadow prices (social values), then add the impact on savings and investment, and then the impact on income distribution. The Little-Mirrlees (L-M) approach values everything in terms of international (border) prices and uses public income in terms of free foreign exchange as the common measure (the numeraire). Traded goods are valued at border prices. Non-traded goods are valued by their cost of production, broken down into traded inputs and labour, using conversion factors.

Key rules to remember

Debt Service Coverage Ratio (DSCR): DSCR = (PAT + Depreciation + Interest on term loan + other non-cash charges) ÷ (Interest on term loan + Repayment of principal in the year); Use the year's figures. Interest is added back in the numerator because it is also part of debt service in the denominator. Some texts use PAT + depreciation + interest; follow the question's given data.
Average DSCR: Average DSCR = Σ (annual cash available for debt service) ÷ Σ (annual debt service) over the loan period; Total cash available divided by total debt service. It is not the simple mean of yearly ratios unless the question says so.
Net social benefit: Net social benefit = Social benefits − Social costs (both at shadow prices); Discount at the social discount rate to get social NPV.
Shadow price: Shadow price = Market price × Conversion factor; The conversion factor is below 1 when the market price overstates the social value, and above 1 when it understates it.
Social NPV: Social NPV = Σ [Net social benefit in year t ÷ (1 + r)^t], t = 0 to n; r is the social discount rate. Accept the project if social NPV is positive.

How to solve Project Financing and Social Cost Benefit Analysis questions

Identify whether the question is about financing, the DSCR, or social appraisal. Then follow the steps below.

1Read the question and mark the data: loan amount, interest rate, repayment schedule, PAT, depreciation, and any shadow prices or conversion factors.
2For a financing question, list the sources (equity, preference, term loan, debentures, subsidy, venture capital, ECB) and say why each suits the project.
3For DSCR, compute the numerator (cash available for debt service) and the denominator (interest plus principal) for each year.
4Divide year by year. If asked for an average, add the numerators and the denominators separately, then divide.
5Compare with the lender's norm or the figure given and state a conclusion: can the project service its debt?
6For SCBA, first state the approach asked: UNIDO or Little-Mirrlees. Name the numeraire and the price basis.
7Adjust the market values to shadow prices using the given conversion factors and compute the net social benefit and social NPV.
8Write the final conclusion: accept or reject on social grounds, and mention any non-quantified benefits or costs.

Quickest way: Fast DSCR and SCBA check

When to use it: Use when the question gives annual figures and asks for a DSCR or a quick accept or reject decision.

Write one row for each year: cash available, interest, principal, debt service.
Compute cash available = PAT + depreciation + interest (add other non-cash items if given).
Compute debt service = interest + principal for the same year.
Divide and write the ratio next to each row; do not round until the end.
For SCBA, multiply each item by its conversion factor and sum; positive social NPV means accept.

Common mistakes in Project Financing and Social Cost Benefit Analysis

Leaving interest out of the DSCR numerator
Students take PAT + depreciation only, forgetting that PAT is after interest.
Fix: Add back interest on the term loan, since the denominator includes it.
Using total debt instead of the year's debt service
The loan amount is given and looks like the denominator.
Fix: Use only that year's interest and principal instalment.
Averaging yearly ratios when asked for the average DSCR
It looks quicker.
Fix: Sum the numerators, sum the denominators, then divide.
Mixing up the UNIDO and Little-Mirrlees numeraires
Both use shadow prices, so they sound alike.
Fix: UNIDO: consumption at domestic prices. L-M: public income in free foreign exchange at border prices.
Treating a positive private NPV as proof of social worth
Students stop at the financial appraisal.
Fix: State that market prices may be distorted and that SCBA adjusts for it.

Worked examples

Example 1

A project has the following for Year 1: PAT ₹30 lakh, depreciation ₹20 lakh, interest on term loan ₹10 lakh, principal repayment ₹25 lakh. Calculate the DSCR and comment.

Show the solution

Cash available = PAT + depreciation + interest = 30 + 20 + 10 = ₹60 lakh.
Debt service = interest + principal = 10 + 25 = ₹35 lakh.
DSCR = 60 ÷ 35 = 1.71 (approximately).

Answer: DSCR is about 1.71. The project generates about ₹1.71 of cash for every ₹1 of debt service, so it covers its payments with a margin. Whether the margin is enough depends on the lender's norm.

Example 2

A project's market-price benefits are ₹5,00,000 a year and labour costs at market price are ₹2,00,000 a year. Labour has a conversion factor of 0.6, and benefits (traded output) a conversion factor of 1.2. Other costs are ₹1,00,000 at a conversion factor of 1. Find the annual net social benefit.

Show the solution

Social benefits = 5,00,000 × 1.2 = ₹6,00,000.
Social labour cost = 2,00,000 × 0.6 = ₹1,20,000.
Other costs = 1,00,000 × 1 = ₹1,00,000.
Total social costs = 1,20,000 + 1,00,000 = ₹2,20,000.
Net social benefit = 6,00,000 − 2,20,000 = ₹3,80,000.

Answer: The annual net social benefit is ₹3,80,000, against a market-price net benefit of ₹2,00,000. Discount these at the social discount rate to find the social NPV.

Exam tips

Write the DSCR formula first, then show a year-wise table. Marks are given for method.
In theory answers, contrast UNIDO and Little-Mirrlees in a short two-column list: numeraire, price basis, treatment of non-traded goods.
Link financing sources to the project's nature and risk, so the answer reads as analysis, not a list.
Always end with a clear conclusion on whether to accept, reject or restructure the financing.

Practice questions from Project Evaluation

Project Financing and Social Cost Benefit Analysis: frequently asked questions

What is the DSCR formula in project finance?

DSCR = cash available for debt service ÷ debt service. Cash available is usually PAT + depreciation + interest, and debt service is interest plus principal repayment in the year. A ratio above 1 means the project covers its debt payments.

What is the difference between UNIDO and Little-Mirrlees approaches?

UNIDO values benefits and costs in terms of consumption at domestic prices. Little-Mirrlees values them at international (border) prices, with public income in free foreign exchange as the numeraire. Both use shadow prices to correct market distortions.

Why is social cost benefit analysis needed?

Market prices may not reflect true social value because of taxes, subsidies, controls and unemployment. SCBA looks at the project's effect on national welfare, which matters for public and infrastructure projects.

What are the main sources of project finance in India?

These include promoters' equity, preference shares, term loans from banks and financial institutions, debentures, venture capital and private equity, subsidies, external commercial borrowings and internal accruals. The mix depends on the project's risk and cash flows.