Finance Day 0 Cheat Sheet: Formulas, Ratios and Interview Answer Framework
A credit committee has ten minutes to decide whether a fast-growing borrower is a great business or a future default. The numbers on the screen look impressive - revenue is up, profit is positive - but one weak cash-flow line or leverage ratio can change the decision completely.
- Finance is three questions: where should money be invested, how should it be financed, and how much value is created.
- Never read profit alone. Connect P&L profit to balance-sheet capital and cash-flow reality.
- Ratio answers need four parts: formula, direction, benchmark, and business reason.
- Valuation is cash flow plus risk. Higher growth creates value only when returns exceed cost of capital.
- Working capital is hidden strategy. Receivable days, inventory days and payable days reveal bargaining power and operating discipline.
- For banks and NBFCs, use lender metrics: NIM, GNPA, NNPA, credit cost and capital adequacy, not manufacturing-style ratios.
- The safest interview structure: business model - financial statements - ratios - cash flow - valuation - risks - recommendation.
The Big Picture: Finance Is a Ladder, Not a Formula List
Day 0 finance prep becomes easy when you stop memorising isolated ratios and climb the ladder: first understand the business, then the statements, then performance, risk, cash flow, valuation and finally the investment or credit view.
The Core Explanation: The 7 Moves That Cover Most Finance Questions
Finance is the language of resource allocation. In interviews, the same logic appears as ratio analysis, valuation, credit assessment, working-capital diagnosis, capital budgeting or business performance review.
The Three Statements in One Flow
The P&L shows performance over a period, the balance sheet shows financial position at a point in time, and the cash-flow statement explains the movement in cash. The trap is treating them separately.
Formula Card 1: Profitability and Efficiency Ratios
Use these when the question asks whether a company is earning enough from its sales, assets or shareholder capital. Always compare with peers, history and business model.
The DuPont Shortcut: Where ROE Really Comes From
ROE can look excellent for three very different reasons: superior margins, fast asset turns or high leverage. DuPont analysis separates these drivers so you do not praise a risky company as an efficient one.
Formula Card 2: Liquidity, Leverage and Working Capital
These ratios answer a survival question: can the firm fund operations, handle shocks and repay debt without destroying growth?
Formula Card 3: Solvency, Cash Flow and Valuation
These ratios help you move from accounting performance to enterprise value. A company can report profit and still destroy value if returns are below the cost of capital or cash conversion is weak.
Formula Card 4: Bank and NBFC Ratios
For banks and NBFCs, do not use inventory days or debt to EBITDA as your main lens. Lending businesses are judged on spread, asset quality, credit cost, funding and capital buffers.
Worked Example: Diagnose One Company in 90 Seconds
Assume a non-financial company has revenue of ₹1,000 crore, EBITDA of ₹180 crore, depreciation of ₹40 crore, interest expense of ₹30 crore, tax rate of 25%, debt of ₹300 crore, cash of ₹50 crore, book equity of ₹500 crore, capex of ₹60 crore and increase in net working capital of ₹20 crore.
A crisp conclusion would be: “This looks financially healthy on leverage and cash flow, with 16.5% ROE and positive FCFF. I would still compare margins and working-capital days with peers before calling it attractive.”
Definitions You Should Be Able to Say in One Breath
- Value - Aswath Damodaran: “The value of an asset is the present value of the expected cash flows on that asset.”
- Accounting equation: Assets = Liabilities + Equity.
- Enterprise value: Market value of operating assets, usually equity value plus net debt and other financing claims.
- Free cash flow: Cash available after operating needs and reinvestment required to sustain the business.
- WACC: Weighted average required return expected by all capital providers, adjusted for capital structure.
- ROIC: After-tax operating profit generated per rupee of invested capital.
Case Study: Bajaj Finance and the Discipline Behind Fast Lending
Bajaj Finance shows why financial analysis must combine growth, risk, funding and capital, not just headline profit.
Bajaj Finance built one of India’s most visible consumer-finance franchises around point-of-sale lending, personal loans, cards, merchant relationships and repeat-customer cross-sell. The visible story is growth. The finance story is more demanding: every loan must earn enough spread to cover funding cost, operating cost, expected credit loss and capital cost.
The primary driver of the model has been disciplined risk-adjusted lending at scale - not merely aggressive loan growth. Supporting drivers include wide distribution partnerships, data-led customer segmentation, strong collections processes, diversified borrowing sources and capital buffers. This matters because Indian NBFCs operate under RBI supervision, face liquidity-cycle risk and can be affected when regulators tighten risk weights or digital-lending norms.
The interview takeaway is powerful: in finance, growth is not automatically good. Growth creates value only when pricing, risk control, funding and capital discipline work together.
How AI Changes Finance Day 0 Prep
AI is changing both finance work and finance interviews. The advantage goes to students who can use AI for sharper analysis without outsourcing judgement.
Interview Relevance
“If I give you the financial statements of a company, how will you quickly assess whether it is financially healthy and attractively valued?”
When you quote any ratio, add one sentence beginning with “This means...” That turns memorisation into financial judgement.
Common Mistake
The biggest error is reciting formulas without interpretation. It costs candidates because finance interviews test judgement, not memory. One-line fix: for every ratio, state formula - direction - benchmark - business reason.
What to Revise Next
This is the final lesson in the finance revision journey. Your natural capstone is a 45-minute mock: pick one listed Indian company, read its latest annual report summary, compute 8-10 core ratios, write a one-page investment or credit view, and defend it aloud.