Bank Balance Sheet and Key Ratios: CASA, NIM, CD Ratio
Bank balance sheet notes for banking exams: Form A liabilities and assets, CASA ratio, net interest margin, credit-deposit ratio, CRAR and NPA norms.
By GK24 Editorial Team· Published · 5 min read

A bank does not sell goods; it sells the use of other people's money. That is why its balance sheet looks nothing like a factory's. Deposits, which a saver thinks of as his money in the bank, sit on the liabilities side, and loans, which a borrower thinks of as the bank's money with him, sit on the assets side. Every banking paper tests this one reversal, and then tests the ratios that are read off the two sides: the CASA ratio, the net interest margin, the credit-deposit ratio and the capital and asset-quality ratios. The notes below explain the statement and each ratio, with the formulas in the form examiners use.
The statutory form of a bank's balance sheet
Section 29 of the Banking Regulation Act, 1949 requires every banking company to prepare its balance sheet and profit and loss account as on the last working day of the accounting year in the forms set out in the Third Schedule to the Act. Form A is the balance sheet and Form B is the profit and loss account. The financial year of banks in India closes on 31 March, and listed banks publish unaudited results every quarter. Section 17 of the same Act requires a banking company to transfer a part of each year's profit, not less than twenty per cent, to a statutory reserve fund before declaring any dividend.
Liabilities and assets, side by side
| Liabilities (sources of funds) | Assets (uses of funds) |
|---|---|
| Capital | Cash and balances with the Reserve Bank of India |
| Reserves and surplus | Balances with banks and money at call and short notice |
| Deposits (demand and time) | Investments (government and other approved securities) |
| Borrowings | Advances (loans, cash credit, overdrafts, bills purchased) |
| Other liabilities and provisions | Fixed assets and other assets |
Deposits are the largest liability of a commercial bank and advances are usually its largest asset. Demand deposits are current and savings balances repayable on demand; time deposits are fixed and recurring deposits repayable after an agreed term. The cash reserve the bank keeps with the Reserve Bank under the Reserve Bank of India Act and the approved securities it holds for the statutory liquidity requirement under Section 24 of the Banking Regulation Act both appear on the assets side, even though they are held because the law commands it.
CASA ratio
CASA stands for current account and savings account. The CASA ratio is the share of these two deposits in total deposits, written as current plus savings deposits divided by total deposits, in per cent. Current accounts pay no interest and savings accounts pay a low rate, so a bank with a high CASA ratio buys its funds cheaply. A bank that depends on bulk term deposits and certificates of deposit pays more for the same rupee and earns a thinner spread. CASA is therefore read as a measure of the quality, not the quantity, of a bank's deposit base.
Net interest income and net interest margin
Net interest income, or NII, is interest earned minus interest expended. The net interest margin, or NIM, expresses that income as a proportion of the assets that produced it: net interest income divided by average earning assets, in per cent. Fee income, treasury profits and commissions are not part of NIM; they are grouped as other income. A bank raises its margin by lowering its cost of deposits, by lending at better yields, or by holding fewer idle assets. The spread, the difference between the yield on advances and the cost of deposits, is the same idea stated without a denominator.
Credit-deposit ratio
The credit-deposit ratio, also called the CD ratio, is total advances divided by total deposits, in per cent. It says how much of every hundred rupees of deposits the bank has lent. A very low ratio means idle funds and lost interest income; a ratio above one hundred means the bank is lending more than it has collected as deposits and is funding the gap with borrowings. Under the Lead Bank Scheme, banks are expected to maintain a credit-deposit ratio of at least sixty per cent in their rural and semi-urban branches, and district consultative committees review districts that fall below it.
Capital and asset-quality ratios
| Ratio | Formula | What it shows |
|---|---|---|
| CRAR (capital adequacy) | Tier 1 plus Tier 2 capital divided by risk-weighted assets | Cushion against losses; minimum nine per cent for Indian banks |
| Gross NPA ratio | Gross non-performing assets divided by gross advances | Share of the loan book that has stopped paying |
| Provision coverage ratio | Provisions held divided by gross non-performing assets | How much of the bad loan book is already provided for |
| Return on assets | Net profit divided by average total assets | Profit earned on each rupee of the balance sheet |
| Cost-to-income ratio | Operating expenses divided by net interest income plus other income | Efficiency; a lower figure is better |
A loan becomes a non-performing asset when interest or instalment remains overdue for more than ninety days. Such an account is classified as sub-standard for the first twelve months, as doubtful once it has stayed sub-standard beyond twelve months, and as a loss asset when recovery is not expected at all. Net non-performing assets are gross non-performing assets minus the provisions held against them.
Items below the balance sheet
Bank guarantees, letters of credit, acceptances and forward exchange contracts create a liability only if the customer defaults, so they are not added to the balance sheet totals. Form A shows them separately as contingent liabilities, and bills for collection are shown as a contra item. Basel III added two liquidity ratios to this reading: the liquidity coverage ratio, high-quality liquid assets against thirty days of net outflows, and the net stable funding ratio, both to be kept at a hundred per cent or more.
Exam Point of View
Three question types repeat. First, place an item on the correct side: deposits are a liability, advances and money at call are assets. Second, state a formula: CASA over total deposits, interest earned minus interest expended for net interest income, advances over deposits for the credit-deposit ratio, and capital over risk-weighted assets for CRAR; the inverted formula is always among the options. Third, give a number: 90 days for a non-performing asset, 12 months from sub-standard to doubtful, 9 per cent CRAR for Indian banks against the Basel 8 per cent, 60 per cent credit-deposit ratio under the Lead Bank Scheme, and 30 days for the liquidity coverage ratio. The traps are the Basel figure offered in place of the Indian one, the old 180-day norm for a non-performing asset, and the Second Schedule of the Reserve Bank of India Act offered where the Third Schedule of the Banking Regulation Act is meant.
Important Facts
| Balance sheet form | Form A, Third Schedule, Banking Regulation Act, 1949 (Section 29) |
|---|---|
| Profit and loss form | Form B, Third Schedule, Banking Regulation Act, 1949 |
| CASA ratio | (Current account deposits + savings account deposits) divided by total deposits |
| Net interest income | Interest earned minus interest expended |
| Net interest margin | Net interest income divided by average earning assets |
| Credit-deposit ratio | Total advances divided by total deposits; 60 per cent expected in rural and semi-urban branches |
| CRAR minimum | 9 per cent for Indian banks; Basel minimum 8 per cent; capital conservation buffer 2.5 per cent |
| NPA trigger | Interest or instalment overdue for more than 90 days |
| Asset classes | Standard, sub-standard (up to 12 months), doubtful, loss asset |
| Statutory reserve | Section 17 requires at least 20 per cent of yearly profit to be transferred to the reserve fund |
| Liquidity ratios | Liquidity coverage ratio over 30 days and net stable funding ratio over one year, both 100 per cent or more |
| Accounting year | Closes on 31 March; results published every quarter |
Practice MCQs on this topic
Which of the following items appears on the liabilities side of a commercial bank's balance sheet?
- A.Advances to customers
- B.Investments in government securities
- C.Deposits of customers
- D.Cash balances with the Reserve Bank of India
Show answer
Explanation
The correct answer is C, deposits of customers. A deposit is money the bank owes back to the depositor, so it is a claim on the bank and is shown under liabilities in Form A of the Third Schedule to the Banking Regulation Act, 1949, along with capital, reserves and surplus, borrowings and other liabilities and provisions. Deposits are normally the largest liability of a commercial bank.
Option A, advances, is wrong because a loan is money owed to the bank and therefore its asset. Option B, investments in government securities, is also an asset; banks hold such approved securities partly to meet the statutory liquidity requirement under Section 24. Option D, cash balances with the Reserve Bank, is an asset too, even though the cash reserve ratio compels the bank to keep it. Candidates who think in the depositor's language, that the money is theirs and the loan is the bank's, invert both sides; the balance sheet is written from the bank's point of view.
The CASA ratio of a bank is the proportion of which of the following to its total deposits?
- A.Cash and statutory liquidity holdings
- B.Current account and savings account deposits
- C.Capital and surplus
- D.Credit and advances to small borrowers
Show answer
Explanation
The correct answer is B, current account and savings account deposits. CASA is short for current account and savings account, and the CASA ratio is current plus savings deposits divided by total deposits, shown as a percentage. It matters because a current account earns the depositor no interest and a savings account only a low rate, so these are a bank's cheapest funds; a high CASA ratio lowers the cost of deposits and widens the spread.
Option A describes cash reserves and statutory liquidity holdings, which belong to the assets side and are governed by the cash reserve ratio and Section 24 of the Banking Regulation Act, not by CASA. Option C, capital and surplus, is the owners' stake and is used in the capital adequacy ratio. Option D invents a lending ratio; the share of advances in deposits is the credit-deposit ratio, a different measure altogether. The trap in this question is reading the letter C as credit or cash instead of current.
Net interest income of a bank is calculated as
- A.Total income minus operating expenses
- B.Interest earned minus interest expended
- C.Net profit minus provisions and contingencies
- D.Interest earned minus operating expenses
Show answer
Explanation
The correct answer is B, interest earned minus interest expended. Net interest income, written as NII, is the core earning of a bank: the interest it collects on advances and investments less the interest it pays on deposits and borrowings. Expressed against average earning assets it becomes the net interest margin, the ratio examiners pair with it.
Option A, total income minus operating expenses, leaves interest paid inside the figure and mixes in fee and treasury income, so it describes neither net interest income nor operating profit correctly. Option C reverses the order of the profit and loss account: provisions and contingencies are deducted from operating profit to reach net profit, so net profit minus provisions is not a defined figure. Option D subtracts the wrong expense, operating expenses such as salaries and rent, from interest earned; those expenses belong to the cost-to-income ratio. Remember that net interest income counts only interest on both sides, and other income is kept separate.
A bank's credit-deposit ratio is obtained by dividing
- A.Total deposits by total advances
- B.Total advances by total deposits
- C.Total advances by risk-weighted assets
- D.Net profit by total deposits
Show answer
Explanation
The correct answer is B, total advances by total deposits. The credit-deposit ratio, usually written as the CD ratio and given in per cent, shows how much of every hundred rupees of deposits a bank has lent out. A low ratio points to idle funds and lost interest income, while a ratio above a hundred per cent means lending exceeds deposits and the gap is being filled by borrowings.
Option A inverts the formula and gives the deposit-credit ratio, which is not the measure the question names; an inverted option is the commonest distractor in this chapter. Option C uses risk-weighted assets, the denominator of the capital to risk-weighted assets ratio, which measures capital adequacy and not deployment of deposits. Option D, net profit over deposits, is a profitability idea closer to return on assets. Remember also that under the Lead Bank Scheme banks are expected to keep a credit-deposit ratio of at least sixty per cent in rural and semi-urban branches.
Under which Schedule of the Banking Regulation Act, 1949 are the forms of a bank's balance sheet and profit and loss account prescribed?
- A.First Schedule
- B.Second Schedule
- C.Third Schedule
- D.Fourth Schedule
Show answer
Explanation
The correct answer is C, the Third Schedule. Section 29 of the Banking Regulation Act, 1949 requires every banking company to prepare, as on the last working day of its accounting year, a balance sheet and a profit and loss account in the forms set out in the Third Schedule to the Act. Form A of that Schedule is the balance sheet and Form B is the profit and loss account, which is why bank accounts across India look alike and can be compared ratio by ratio.
Option A, the First Schedule, and Option D, the Fourth Schedule, do not carry these forms. Option B, the Second Schedule, is the familiar trap, but the Second Schedule that matters to banking is in the Reserve Bank of India Act, 1934: a bank listed in it is called a scheduled bank. Candidates mix the two Acts, so fix the pair in memory as forms in the Third Schedule of the Banking Regulation Act, scheduled banks in the Second Schedule of the Reserve Bank of India Act.
A loan account is classified as a non-performing asset when the interest or instalment remains overdue for more than
- A.30 days
- B.60 days
- C.90 days
- D.180 days
Show answer
Explanation
The correct answer is C, 90 days. Under the income recognition and asset classification norms followed by banks in India, a term loan becomes a non-performing asset when interest or an instalment of principal remains overdue for more than ninety days. The same ninety-day rule is applied, in its own form, to cash credit and overdraft accounts that stay out of order and to crop loans through the season rule.
Option A, thirty days, and Option B, sixty days, describe an account that is merely overdue; such an account is flagged as a special mention account, so that the bank acts before it slips, but it is still a standard asset. Option D, a hundred and eighty days, is the old Indian norm, replaced when the ninety-day international practice was adopted, and it survives only in stale study material. After the ninety-day mark the account is sub-standard for twelve months, doubtful thereafter, and a loss asset when no recovery is expected.
The capital to risk-weighted assets ratio that the Reserve Bank of India requires scheduled commercial banks to maintain as a minimum is
- A.6 per cent
- B.8 per cent
- C.9 per cent
- D.12 per cent
Show answer
Explanation
The correct answer is C, 9 per cent. The capital to risk-weighted assets ratio, or CRAR, is Tier 1 plus Tier 2 capital divided by risk-weighted assets, and the Reserve Bank of India requires Indian scheduled commercial banks to keep it at a minimum of nine per cent, with a capital conservation buffer of 2.5 per cent of risk-weighted assets held on top of it in common equity.
Option B, eight per cent, is the Basel minimum set by the Basel Committee on Banking Supervision; the Indian requirement is deliberately one percentage point stricter, and this pair is the favourite trap of the chapter. Option A, six per cent, is close to the Tier 1 figures in the framework but is not the total requirement. Option D, twelve per cent, is higher than the norm and belongs to no rule, although many large banks do report a ratio above it. Risk weights are why the denominator is not simply total assets: a government security carries far less weight than an unsecured loan.
Which of the following is shown as a contingent liability, that is, as an off-balance-sheet item, in a bank's accounts?
- A.Term deposits accepted from the public
- B.Bank guarantees issued on behalf of customers
- C.Cash credit limits already drawn by borrowers
- D.Government securities held as investments
Show answer
Explanation
The correct answer is B, bank guarantees issued on behalf of customers. A guarantee becomes a payment only if the customer fails to perform, so it is not added to the totals of the balance sheet; Form A shows guarantees, letters of credit, acceptances and forward exchange contracts separately as contingent liabilities, and bills for collection appear as a contra item. These exposures still carry risk, which is why they attract capital charges and are watched by supervisors.
Option A, term deposits, is a certain liability on the balance sheet itself. Option C is wrong because a drawn cash credit limit is an advance and sits among assets; only the undrawn portion is an off-balance-sheet commitment. Option D, government securities, is an ordinary asset held partly for the statutory liquidity requirement. The examiner tests the idea of a liability that may or may not arise, so read the word contingent as conditional on default.
A sub-standard asset of a bank is reclassified as a doubtful asset when it has remained sub-standard for a period exceeding
- A.6 months
- B.12 months
- C.18 months
- D.36 months
Show answer
Explanation
The correct answer is B, 12 months. Asset classification moves in steps. An account that stays overdue beyond ninety days becomes a non-performing asset and is first called sub-standard; once it has remained sub-standard for more than twelve months it is reclassified as doubtful, and it is called a loss asset when the bank or its auditors or the inspection find it irrecoverable, whether or not some salvage value remains.
Option A, six months, and Option C, eighteen months, belong to no stage of this ladder and are offered because they sound like plausible supervisory periods. Option D, thirty-six months, is wrong as a trigger, although the doubtful category is itself divided by age, up to one year, one to three years and more than three years, with rising provisioning. The practical point for the exam is that provisioning rises at every step, which is why classification, not merely recovery, decides a bank's reported profit.
The liquidity coverage ratio introduced under the Basel III framework requires a bank to hold high-quality liquid assets sufficient to meet its net cash outflows over a stress period of
- A.7 days
- B.30 days
- C.90 days
- D.one year
Show answer
Explanation
The correct answer is B, 30 days. The liquidity coverage ratio asks a bank to hold enough unencumbered high-quality liquid assets, mainly cash, balances with the central bank and government securities, to survive thirty calendar days of a severe stress scenario without fresh funding. The ratio is to be maintained at a hundred per cent or more, which means the stock of such assets must at least equal the estimated net outflow of those thirty days.
Option A, seven days, is too short and matches no Basel standard. Option C, ninety days, borrows the number from the non-performing asset rule and is the trap here. Option D, one year, is the horizon of the companion standard, the net stable funding ratio, which compares available stable funding with required stable funding over a year and is also kept at a hundred per cent. Pair the two in memory: liquidity coverage for thirty days of stress, net stable funding for a year of structure.
Frequently Asked Questions
Why are deposits a liability and loans an asset for a bank?
A bank keeps its books from its own side. A deposit is money it must return to the depositor, so it is a claim against the bank and appears under liabilities. A loan is money a borrower must return to the bank, so it is a claim the bank holds and appears under assets, along with cash, balances with the Reserve Bank and investments.
What does a high CASA ratio mean for a bank?
It means a larger share of the bank’s deposits sits in current and savings accounts, which pay no interest or a low rate. The bank’s cost of deposits falls, its spread widens and its net interest margin improves, so a high CASA ratio is read as a sign of a strong, low-cost deposit base.
How is the credit-deposit ratio different from the capital adequacy ratio?
The credit-deposit ratio divides advances by deposits and shows how much of the deposits a bank has lent. The capital adequacy ratio, or CRAR, divides Tier 1 and Tier 2 capital by risk-weighted assets and shows how much loss the bank can absorb. One is about deployment of funds, the other about the cushion of capital.
When does a loan become a non-performing asset in India?
When interest or an instalment of principal remains overdue for more than ninety days. The account is then sub-standard for twelve months, doubtful after that, and a loss asset when it is found irrecoverable. An account overdue for less than ninety days is flagged as a special mention account but is still a standard asset.
What are off-balance-sheet items of a bank?
They are exposures that become a liability only on a condition, such as bank guarantees, letters of credit, acceptances and forward exchange contracts. Form A shows them below the balance sheet as contingent liabilities, and bills for collection as a contra item, because no money has moved yet.
Sources
- The Banking Regulation Act, 1949: Sections 17, 24 and 29 with the Third Schedule — Government of India
- Master Circular: Prudential norms on income recognition, asset classification and provisioning — Reserve Bank of India
- Master Circular: Basel III capital regulations — Reserve Bank of India





