CRR, SLR, Repo Rate, Bank Rate and OMO Explained

The central bank wants to reduce inflation. Should it buy government securities or sell them? Should it raise the repo rate or lower it? And why do CRR and SLR appear in the same chapter when they are different requirements?

If these questions feel like a collection of opposite arrows, start with one habit: follow the money before naming the effect.

A central bank can influence the amount banks must retain, the cost of borrowing, and the reserves available in the banking system. Each instrument begins at a different point in that process.

Think of an orchard with carefully managed irrigation. Water supports growth, but opening every gate is not always helpful. Credit control works through similar questions about availability, cost and balance. The comparison below will help you identify the instrument; the examples will help you explain it.

The five instruments at a glance

Instrument	What it concerns	A tightening action
Cash Reserve Ratio, or CRR	Required cash balances with RBI	Raise the ratio
Statutory Liquidity Ratio, or SLR	Required holdings of eligible liquid assets	Raise the ratio
Repo rate	Cost of RBI lending through repurchase agreements	Raise the rate
Bank Rate	RBI’s standard discount rate, aligned with MSF	Raise the rate
Open market operations, or OMO	RBI purchases and sales of government securities	Sell securities

For the usual classroom question, the opposite actions ease credit conditions. Always add other things remaining unchanged to your reasoning: an instrument’s expected influence is not a promise about the final amount of borrowing.

The NCERT Money and Banking chapter places reserve requirements, Bank Rate and open market operations among general, or quantitative, credit-control methods. They influence overall monetary conditions. Methods aimed at particular uses of credit, such as changing margin requirements, belong to a different part of the discussion.

If the role of commercial banks is still new to you, begin with our Money and Banking guide.

CRR: the cash balance requirement

Cash Reserve Ratio is the prescribed proportion of net demand and time liabilities that scheduled commercial banks must maintain as cash balances with RBI. These required balances do not earn interest.

NDTL means net demand and time liabilities. Demand liabilities are payable on demand; time liabilities are payable otherwise than on demand. The regulatory calculation includes adjustments, so NDTL should not automatically be treated as identical to a bank’s total deposits.

For a school numerical that explicitly supplies deposits as the calculation base, use that base. You do not need to reconstruct a regulatory return.

The formula is:

Required CRR balance = Relevant liability base x CRR / 100

A higher ratio requires a larger balance for the same base. A lower ratio releases part of the previously required balance for other uses. RBI’s commercial-bank CRR and SLR directions provide the underlying definitions and requirements.

Example 1: a CRR increase

A fictional bank has NDTL of Rs 2,000 crore. CRR rises from 4% to 5%, with NDTL unchanged.

Calculation	Amount
Original requirement: 2,000 x 4 / 100	Rs 80 crore
New requirement: 2,000 x 5 / 100	Rs 100 crore
Additional required balance: 100 - 80	Rs 20 crore

The bank must now maintain Rs 20 crore more as required CRR balances. That is the direct answer.

Do not automatically write that loans fall by exactly Rs 20 crore. The bank’s response depends on its existing excess reserves, funding and other decisions. A reserve requirement is one constraint on lending, not a complete forecast of it.

Example 2: a falling ratio with a growing base

Now try a more interesting question:

• Original NDTL: Rs 1,000 crore; original CRR: 5%.
• New NDTL: Rs 1,400 crore; new CRR: 4%.

Original requirement = 1,000 x 0.05 = Rs 50 crore.

New requirement = 1,400 x 0.04 = Rs 56 crore.

The ratio falls, yet the required amount rises by Rs 6 crore. The larger liability base outweighs the lower percentage.

To isolate the effect of the rate cut, compare requirements on the same new base: 5% of Rs 1,400 crore would be Rs 70 crore. The cut lowers that requirement to Rs 56 crore, a release of Rs 14 crore relative to the unchanged-rate case.

Both statements are correct. One compares two actual situations; the other isolates the policy change.

SLR: the liquid-asset requirement

Statutory Liquidity Ratio requires banks to maintain a prescribed share of NDTL in eligible liquid assets. These can include cash, gold and qualifying unencumbered securities. Government securities are an important example.

SLR is a requirement on the bank’s asset holdings. It should not be described as another identical cash deposit with RBI. Nor should you assume that every asset meeting SLR is idle or earns nothing: interest-bearing government securities can provide income.

The formula is:

Required SLR assets = Relevant liability base x SLR / 100

A higher requirement can restrict the room for other assets, including loans, if the bank must adjust its holdings to meet it. A lower requirement creates flexibility; it does not order the bank to sell securities and lend the proceeds.

Example 3: required holdings versus an actual shortfall

Suppose NDTL is Rs 2,000 crore, SLR is 20%, and eligible SLR assets are worth Rs 450 crore.

Required holdings = 2,000 x 20% = Rs 400 crore.

Excess eligible holdings = 450 - 400 = Rs 50 crore.

If SLR rises to 22%, the new requirement is:

2,000 x 22% = Rs 440 crore.

The bank still has Rs 10 crore above the minimum. It does not need to acquire another Rs 40 crore of assets merely because the requirement rose by that amount. Its existing holdings already cover the increase.

Now change one fact. If eligible holdings were only Rs 420 crore, the shortfall against the new requirement would be:

440 - 420 = Rs 20 crore.

The question to ask is: What does the bank already hold?

CRR and SLR: the distinction to remember

Use the phrase cash balance requirement for CRR and eligible liquid-asset requirement for SLR. RBI’s reserve-requirement guidance explains this distinction, including the absence of interest on required CRR balances.

Can you subtract CRR and SLR from deposits?

You can do so in a simplified allocation exercise when the question explicitly asks for it.

Suppose the exercise gives a common base of Rs 1,000 crore, CRR of 5%, SLR of 20%, and assumes separate holdings with no other requirements.

• CRR allocation: Rs 50 crore.
• SLR allocation: Rs 200 crore.
• Amount outside these two allocations: 1,000 - 50 - 200 = Rs 750 crore.

Label Rs 750 crore precisely. It is the remainder in this simplified allocation, not proof that the bank will make Rs 750 crore of loans.

Also, do not automatically use 1 / (CRR + SLR) as a real-world money multiplier. For a classroom multiplier problem, use the reserve ratio and assumptions stated in that problem. Our credit creation and deposit multiplier guide works through that separate model.

Repo rate: the price of borrowing through a repo

A repurchase agreement, shortened to repo, combines a securities transaction with an agreement to reverse it at a specified later date and price. In an RBI liquidity-injecting repo, the bank receives funds against eligible securities and repays under the agreed terms.

The policy repo rate is the key policy interest rate decided by the Monetary Policy Committee. Raising it tends to make borrowing conditions more expensive; lowering it tends to ease them. The RBI’s account of monetary-policy instruments explains the policy rate and related facilities.

Keep rate and operation separate:

• The repo rate describes a price of borrowing.
• A repo operation supplies an amount of liquidity for a specified period.

A question about a 25-basis-point cut is asking about a rate change. A question about a repo auction supplying Rs 10,000 crore is asking about an operation’s size. You cannot convert one into the other without more information.

Example 4: basis points and borrowing cost

Suppose an exercise changes an annual interest rate from 6.50% to 6.25%.

The reduction is:

0.25 percentage points = 25 basis points.

It is not a 25% reduction in the rate. The relative percentage reduction is approximately 3.85%, which is a different calculation.

For a hypothetical Rs 100 crore, seven-day borrowing, assume simple interest, a 365-day year, and that these rates apply to the full borrowing period.

Interest = Principal x Annual rate / 100 x Days / 365

At 6.50%:

Rs 100 crore x 0.065 x 7 / 365 = approximately Rs 12.47 lakh.

At 6.25%:

Rs 100 crore x 0.0625 x 7 / 365 = approximately Rs 11.99 lakh.

Saving = approximately Rs 47,945.

This is an illustration of interest arithmetic, not a claim that every RBI auction clears at the policy rate or that a customer’s loan instantly reprices by the same amount.

Bank Rate: related to repo, but a separate concept

The Bank Rate is RBI’s standard rate for buying or rediscounting eligible bills of exchange and commercial paper. Rediscounting means discounting a bill again after it has already been discounted by another institution.

In the familiar textbook explanation, a higher Bank Rate makes central-bank finance more expensive and discourages credit expansion. The reverse direction supports easier credit conditions.

In India’s operating framework, Bank Rate is aligned with the Marginal Standing Facility, or MSF, rate. MSF provides eligible banks with overnight liquidity against eligible collateral under prescribed conditions.

For a comparison answer, identify repo by its repurchase agreement and Bank Rate by its standard discount-rate definition. Avoid relying solely on the shortcut that one is short-term and the other is long-term. That misses the defining transaction and the Bank Rate’s alignment with MSF.

Open market operations: follow RBI’s payment

In the comparison here, OMO means RBI’s outright purchases or sales of government securities to alter durable liquidity. RBI’s government-securities primer explains the direction: purchases supply liquidity and sales absorb it.

The easiest memory aid is to picture the payment:

RBI buys securities → RBI pays → banking-system reserves rise.

RBI sells securities → buyers pay RBI → banking-system reserves fall.

The securities and the money move in opposite directions. Follow the money when deciding whether the operation injects or absorbs liquidity.

Example 5: purchase from a bank

RBI buys securities from Bank A for Rs 300 crore. Ignore valuation gains, accrued interest and all other transactions.

Bank A’s immediate asset changes are:

Asset	Change
Government securities	Minus Rs 300 crore
Reserve balance with RBI	Plus Rs 300 crore
Total assets from this exchange alone	No change

The bank has exchanged one asset for another. Its reserves increase, but there is no automatic new customer deposit in this particular transaction because the seller was the bank itself.

If the seller were a non-bank customer paid through their bank, the immediate accounting would differ: their bank deposit and the bank’s reserves would rise. Always identify the seller before describing the deposit effect.

Example 6: purchase and sale in the same period

RBI buys securities for Rs 500 crore and sells securities for Rs 180 crore. Assume these are the only liquidity operations in the exercise.

Net reserve injection = 500 - 180 = Rs 320 crore.

The answer is neither Rs 500 crore nor Rs 680 crore. You must subtract the absorption from the injection.

Now reverse the amounts. Purchases of Rs 180 crore and sales of Rs 500 crore produce a net absorption of Rs 320 crore.

Repo versus outright OMO

Both can involve government securities, but a repo has an agreed reversal. An outright purchase has no such built-in repurchase commitment.

Some textbooks use OMO broadly enough to include repos. When asked to compare repo with OMO, make your meaning explicit by writing outright OMO. This avoids an unnecessary disagreement over terminology.

An outright operation’s effect is described as durable because it does not automatically unwind on a repo repayment date. That does not mean RBI can never offset it with another operation later.

Reverse repo, SDF and the policy corridor

You may also encounter reverse repo, under which RBI absorbs funds against securities, rather than supplying funds to banks.

A useful update for older notes: in April 2022, RBI introduced the Standing Deposit Facility, or SDF, as the floor of the liquidity-adjustment-facility corridor, replacing fixed-rate reverse repo in that role. SDF absorbs funds without RBI supplying collateral. MSF forms the upper end of the corridor.

The RBI announcement introducing SDF also retained fixed-rate reverse repo in the toolkit. So neither of these statements is accurate: “reverse repo was abolished” or “fixed reverse repo must always be the corridor floor.”

For a basic reverse-repo question, explain its absorption mechanism. For a question about the operating corridor, distinguish it from SDF.

How to explain inflation control in an answer

A good answer connects the instrument to banks, borrowing and spending. For a repo-rate increase, write:

A higher repo rate raises the cost of RBI borrowing and tends to tighten wider borrowing conditions. Costlier credit can discourage interest-sensitive consumption and investment, moderating aggregate demand and easing demand-driven inflationary pressure over time.

Then adapt the middle of the chain to the instrument named. A CRR answer should discuss required balances; an outright OMO-sale answer should discuss the payment to RBI and reserve absorption. Replacing only the instrument’s name produces an incomplete explanation.

Why use words such as tends to and over time? Banks and borrowers do not all respond immediately. Loan contracts, funding costs, risk assessments and demand for borrowing matter. Monetary policy cannot directly grow a failed crop or repair a blocked supply route either.

The Bank of England’s explanation of money creation is useful for understanding why lending is not simply an automatic multiplication of reserves. The same conceptual caution helps us interpret these classroom exercises without treating them as exact lending forecasts.

A case-study method you can reuse

Read this fictional case:

Demand-driven inflation is rising. The central bank increases the policy repo rate, raises CRR and sells government securities. Explain the intended effect on credit conditions.

Build the answer in three steps:

1. Identify each action. A rate increase, a higher reserve requirement and an outright OMO sale.
2. Explain each immediate channel. More expensive RBI borrowing; more required cash balances for a given liability base; reserve absorption through securities sales.
3. Connect them to the objective. Together, they tend to restrain credit growth and interest-sensitive spending, reducing demand pressure.

Now consider a less tidy case:

The central bank leaves the repo rate unchanged but buys securities after a temporary shortage of banking-system liquidity.

You can identify an injection of reserves. You cannot conclude from that fact alone that the central bank has abandoned inflation control. Managing liquidity and changing the policy interest rate are distinct decisions.

Eight questions to practise

Try these before looking at the answers. All figures are hypothetical; ignore other changes unless stated.

1. NDTL is Rs 800 crore. CRR rises from 4% to 4.5%. Find the additional required cash balance.
2. NDTL is Rs 1,500 crore and SLR is 20%. Eligible SLR holdings are Rs 275 crore. Find the shortfall.
3. A rate falls from 7% to 6.5%. Express the fall in percentage points and basis points.
4. RBI sells securities for Rs 90 crore. Does this inject or absorb reserves?
5. RBI buys securities for Rs 240 crore and sells securities for Rs 310 crore. Find the net effect.
6. A bank already holds Rs 390 crore of eligible assets. Its SLR requirement rises from Rs 350 crore to Rs 380 crore. Must it acquire more assets solely to meet the new minimum?
7. NDTL changes from Rs 600 crore to Rs 800 crore while CRR falls from 5% to 4%. How does the required amount change?
8. A repo-rate cut occurs, but a business sees no profitable reason to expand. Must it take a new loan?

Answers and working

1. Old balance = 800 x 4% = Rs 32 crore. New balance = 800 x 4.5% = Rs 36 crore. Additional requirement: Rs 4 crore.
2. Required assets = 1,500 x 20% = Rs 300 crore. Shortfall: Rs 25 crore.
3. 0.5 percentage points, or 50 basis points.
4. Absorbs Rs 90 crore, because buyers pay RBI.
5. 240 - 310 = -70. Net absorption: Rs 70 crore.
6. No. It still has Rs 10 crore above the new minimum, assuming all holdings remain eligible and their value is unchanged.
7. Old balance = Rs 30 crore; new balance = Rs 32 crore. The required amount rises by Rs 2 crore, despite the ratio cut.
8. No. Easier borrowing conditions do not create a business opportunity by themselves.

Frequently asked questions

1. What is the quickest way to distinguish CRR from SLR?

CRR concerns required cash balances with RBI. SLR concerns eligible liquid-asset holdings, which can include qualifying securities. Start by identifying the asset required.

2. Does RBI pay interest on CRR balances?

No interest is paid on the required CRR balances of scheduled commercial banks. Do not confuse those balances with funds placed under an interest-bearing facility such as SDF.

3. Does SLR mean money is earning nothing?

No. A bank can earn interest on qualifying government securities held toward SLR. Cash and securities do not have identical income characteristics.

4. Does a lower CRR guarantee more loans?

No. It reduces the required cash balance for a given liability base. How banks use the resulting flexibility depends on their circumstances and demand from suitable borrowers.

5. Are repo rate and Bank Rate the same?

No. Repo relates to borrowing through a repurchase agreement. Bank Rate has a standard discount-rate definition and is aligned with MSF. Similar policy directions do not make the terms interchangeable.

6. Why does an OMO purchase inject liquidity?

RBI pays for the securities it buys. That payment adds banking-system reserves. Think about who pays whom before following the securities themselves.

7. Is a repo an outright purchase?

No. A repo includes an agreed reversal. An outright purchase does not carry that built-in repurchase commitment.

8. Is a 25-basis-point cut the same as a 25% cut?

No. Twenty-five basis points equal 0.25 percentage points. A fall from 6.50% to 6.25% is a 25-basis-point cut, not a 25% cut.

9. Should I use today’s policy rates in a numerical?

Use the rates given in the question. If asked for current rates, check RBI’s latest published figures and specify their effective date. Do not replace an exercise’s assumptions with a remembered news headline.

10. What should an answer on credit control always include?

Name the instrument, explain what changes for the bank, and connect that change to the likely effect on credit and spending. For a numerical, also show the calculation base, rate, working and unit. Those steps make your reasoning visible even before the final answer.