How Banks Decide Your Home Loan Interest Rate: Benchmark Plus Spread

By BillCut
Last updated: September 2026

A new floating rate home loan is priced as an external benchmark plus a spread. The benchmark is the bank’s choice from four the Reserve Bank of India permits, and it must reset at least once every three months. The spread is the bank’s own, and once set it is far harder to change than most borrowers assume.

How Do Banks Decide a Home Loan Interest Rate?

In two parts, governed by different rules. The Reserve Bank of India’s Interest Rate on Advances Directions, 2016, updated as on 1 October 2025, require that all new floating rate personal or retail loans, housing among them, be benchmarked to an external benchmark from 1 October 2019. The same applies to floating rate loans to micro and small enterprises, and from 1 April 2020 to medium enterprises.

The benchmark is not a free choice. The directions permit four: the Reserve Bank of India policy repo rate, the Government of India three month treasury bill yield published by Financial Benchmarks India Private Limited, the six month treasury bill yield published by the same body, and any other benchmark market interest rate published by it.

On top of that sits the spread, which is the bank’s own margin. Together they make your rate.

Component	Who decides it	How often it can change
External benchmark	The bank picks one of four permitted benchmarks	Resets at least once every three months
Credit risk premium, part of the spread	The bank, based on your credit assessment	Only when your credit assessment undergoes a substantial change
Operating cost and other spread components	The bank	Once in three years, with an exception allowing an earlier reduction

One further rule shapes the market. The adoption of multiple benchmarks by the same bank is not allowed within a loan category, so a bank cannot offer one borrower a repo linked home loan and another a treasury bill linked one. Whatever benchmark it has chosen for housing applies to every housing borrower it takes on.

What Is the Spread, and Why Does It Matter More Than the Benchmark?

Because the benchmark is the same for every borrower at that bank, and the spread is not. Two people taking a home loan from the same bank on the same day sit on the same benchmark. Any difference between their rates is spread.

The directions state that banks are free to decide the spread over the external benchmark. What they are not free to do is move it at will afterwards. The credit risk premium may undergo change only when the borrower’s credit assessment undergoes a substantial change, and other components of the spread, including operating cost, may be altered once in three years, with an exception permitting an earlier reduction for customer retention on justifiable grounds.

Read that carefully and a practical conclusion follows. The number you negotiate at sanction is the number you keep. If you accept a quarter point more spread than you needed to, you are not accepting it for this quarter. You are accepting it until your credit assessment changes substantially or the bank chooses to reduce it.

This also answers the question borrowers ask when policy rates fall and their instalment does not move as much as expected. A benchmark cut reaches you at the next reset, which is at least quarterly, and it reaches every borrower on that benchmark equally. What does not move is the spread. A bank that cut its spread for new customers while leaving yours in place has done nothing irregular, because the components of your spread are governed by the change rules above rather than by what it is quoting this month. The gap between a new customer’s rate and yours is usually spread rather than benchmark, which is why it persists.

The cost is larger than it looks. Take an illustrative Rs 50,00,000 home loan over twenty years. These are worked examples at representative rates, not any lender’s terms.

Rate	Monthly instalment	Total interest
8.00 per cent	Rs 41,822	Rs 50,37,281
8.25 per cent	Rs 42,603	Rs 52,24,788
8.50 per cent	Rs 43,391	Rs 54,13,879

A quarter of a percentage point is Rs 781 a month and about Rs 1,87,507 over the life of the loan. Half a point is Rs 1,569 a month and about Rs 3,76,598. That is the value of the conversation most borrowers do not have, because they are told the rate rather than asked about it.

What Does Your Own Profile Actually Change?

The credit risk premium, which is one component of the spread. It is where your credit record, income and obligations are priced, and it is the only part of the rate that is about you rather than about the bank or the market.

That premium is set from an assessment made at sanction. The record it draws on is maintained under the Reserve Bank of India’s Credit Information Reporting Directions, 2025, which require credit information to be kept updated fortnightly, as on the fifteenth and the last day of each month, with submission within seven calendar days, and give you one free full credit report including your score once in each January to December year.

The practical order is therefore the opposite of what most people do. Pull the free report and correct anything wrong on it before you apply, because the assessment made at sanction is the one you live with. Correcting an error afterwards does not automatically reprice your loan; the directions only allow the credit risk premium to change on a substantial change in assessment, which is a higher bar than a tidied report. How the record is built is set out in how credit bureaus work in India, and what a lender is required to check is in personal loan eligibility.

What About MCLR and Older Home Loans?

MCLR still exists, and if your loan predates October 2019 it may well still be on it. What changed is that new floating rate retail loans cannot be priced that way any more.

The distinction matters because the two behave differently. An external benchmark linked loan moves with a published market rate and must reset at least once in three months. An MCLR linked loan moves with the bank’s own marginal cost of funds calculation and resets on the periodicity in the contract, which is commonly a year.

Question	External benchmark linked	MCLR linked
Applies to	New floating rate retail loans from 1 October 2019	Loans priced before that, still running
What the rate follows	A published external benchmark	The bank’s own marginal cost of funds
Reset frequency	At least once in three months	As per the loan contract
Transparency to the borrower	The benchmark is published and observable	The calculation is the bank’s own

If you are on an older loan and a rate cut does not seem to reach you, this is usually why. It is worth asking your bank what your loan is benchmarked to before assuming the bank is withholding a reduction.

What Happens to Your Rate After Sanction?

The benchmark moves and your loan moves with it, at least quarterly. What the lender must do at that point is set out in the Reserve Bank of India’s directions on the reset of floating interest rates, updated as on 1 October 2025.

At a reset the lender must communicate clearly the possible impact of a change in the benchmark on the instalment, the tenor or both, and communicate any resulting increase immediately. The borrower must be given the choice of an enhanced instalment, an elongated tenor, or a combination of both, and to prepay in part or in full at any point during the tenor. Elongation of tenor must not result in negative amortisation.

There is also a statement you are entitled to and probably have never opened. At the end of each quarter the lender must provide a statement enumerating at minimum the principal and interest recovered to date, the instalment amount, the number of instalments left and the annualised rate for the entire tenor. On a twenty year loan that is the only regular document that tells you where you actually are.

If the instalment rather than the rate is the problem, the tenor option has a cost of its own, set out in changing your loan tenure. And if a card balance is what is squeezing the instalment, you can look at what a structured repayment would cost through BillCut’s debt refinancing service.

Who Should and Should Not Try to Move Their Rate?

Push at sanction, always. That is the one moment the spread is genuinely negotiable, and it is the number that persists.

Ask for a spread reduction if you have been with the bank a while and your position has improved. The directions permit a reduction in the non credit risk components of the spread earlier than three years for customer retention on justifiable grounds, so the request is not unreasonable and the bank has a stated route to grant it.

Consider moving lenders if the gap is wide and your loan is eligible for free prepayment. Under the Reserve Bank of India’s Pre-payment Charges on Loans Directions, 2025, applying to loans sanctioned or renewed on or after 1 January 2026, no pre-payment charges may be levied on floating rate loans granted to individuals for purposes other than business, irrespective of the source of funds and with no minimum lock-in. The four conditions that decide whether yours qualifies are set out in this guide to prepayment charges.

Do not chase a quarter point on an older loan without checking the costs of moving, which sit outside the rate and can exceed a year of the saving.

Do not assume a fixed rate is safer because it does not move. It is priced higher at the outset for precisely that reason, and the comparison to make is the annual percentage rate rather than the headline.

What Should You Ask Before You Sign?

Five questions, and the first three decide the rate.

Ask	Why it matters
Which external benchmark is this loan linked to	One of four is permitted, and the bank uses only one across housing
What is the spread, and what is the credit risk premium within it	The spread is the negotiable part. The premium inside it is the part that is about you
What would reduce the spread	Ask before signing, because the premium changes only on a substantial change in assessment
How often does the rate reset	At least once in three months on an external benchmark loan. Confirm the date
May I have the Key Facts Statement	It carries the annual percentage rate computation sheet and the amortisation schedule

The Key Facts Statement comes from the Reserve Bank of India’s circular on the Key Facts Statement for loans and advances, and it is the document that lets you compare two offers properly, because it folds the fees into one figure. A quarter point of spread and a one per cent processing fee are not the same shape of cost, and the annual percentage rate is the only place they are expressed in the same units.

Frequently Asked Questions

This article is for information only. It is not financial advice and it does not recommend any lender or loan. Benchmarks, spreads, rates and regulatory requirements change, and every figure in the worked examples is illustrative rather than any lender’s actual terms, so confirm the current position with the Reserve Bank of India and with your bank, and read the Key Facts Statement and the sanction letter before accepting any home loan offer.