Fixed, Floating and Hybrid: What an External Benchmark Does to Your EMI

Most comparisons of fixed and floating read as though they were two prices and you should pick the smaller one. They are not two prices. They are two allocations of the same risk — the risk that interest rates move over the next two decades — and the question is which side of it you would rather be on, given a household budget you actually have to live inside.

The good news for an Indian borrower is that the floating side has a defined, readable structure. You can find every component of it in your own sanction letter. No rate appears in this post; the framework and the regulator are named instead, because rates and benchmark values change and a figure typed here would mislead somebody on the day they read it.

What your rate is actually made of

A floating home loan rate has exactly two parts.

• The benchmark. An externally published rate the lender does not set. It moves with monetary conditions, and every borrower on the same benchmark sees the same movement at the same time.
• The spread. What the lender adds on top. It is conventionally split into an operating margin, which is the lender's own pricing, and a credit-risk premium, which reflects the assessment of you as a borrower.

The distinction matters because the two behave differently over the life of the loan. The benchmark is expected to move and your rate moves with it automatically at each reset. The spread is contractually sticky: your agreement will specify the circumstances in which each component may be revised — typically the operating margin only at long intervals and the credit-risk premium only on a material change in your credit standing. Find that clause. It is the difference between a rate that tracks the market and a rate the lender can move at will.

The external benchmark framework

Floating-rate retail loans in India are linked to an external benchmark under a framework of the Reserve Bank of India. Lenders choose their benchmark from a defined set of externally published rates and are required to adopt a uniform benchmark within a loan category, so a lender cannot offer two customers in the same product different benchmarks to muddy comparison.

The reason the framework exists is transmission. Under the previous internal-benchmark regimes, the rate a borrower paid was computed off a number the lender itself published, and reductions in policy rates reached existing borrowers slowly, if at all. An externally published benchmark is not the lender's to manage.

Two practical consequences. The benchmark part of your rate is verifiable — you can look it up rather than take it on trust. And a comparison between two lenders is really a comparison of spreads, since the benchmark component will move for both of them in the same direction at much the same time.

Resets: what changes, and what does not

A reset is the moment your rate is recomputed from the current benchmark value plus your spread. Under the framework, the rate on an externally benchmarked loan is reset at least once in three months, and the exact reset dates for your loan are in your sanction letter.

What changes at a reset is the applicable interest rate, and therefore the split of every future instalment between interest and principal. What does not change is your outstanding principal, your spread, or anything about the loan agreement itself. A reset is not a renegotiation and it is not a fresh sanction.

What is worth doing at each reset is dull and useful: check that the rate applied equals the published benchmark plus the spread in your agreement. Errors are uncommon, but they are undetectable if nobody looks, and the arithmetic takes a minute.

Does a reset move the instalment or the tenure?

When a floating rate rises, something has to give. A lender can hold your instalment level and extend the tenure, raise the instalment and hold the tenure, or do a combination of the two. Historically many lenders defaulted to extending the tenure, because a level instalment is invisible to the borrower — which is how people discovered, years later, that a loan they thought was ending had years still to run, or in extreme cases that the instalment no longer covered the interest accruing.

The Reserve Bank of India has since issued directions on the reset of floating interest rates on equated instalment based personal loans. Without paraphrasing text that has been amended, the thrust is about the borrower knowing and choosing: communication of the reset and its consequences, an option to switch to a fixed rate, a choice between enhancing the instalment or extending the tenure or both, the ability to prepay, and transparent disclosure of any charges for exercising these options. Read the current circular on the Reserve Bank's own site, and ask your lender which route it applies in the absence of an instruction from you.

Then decide deliberately. Extending the tenure protects this month's cash flow and costs more interest over the life of the loan; raising the instalment does the reverse. Run both on the EMI calculator with your own principal and residual term, and read the total interest line, not just the monthly figure.

What "fixed" usually means here

On most Indian home loan products, fixed does not mean fixed for the tenure. It means fixed for an initial period stated in the sanction letter, after which the loan converts to the lender's floating structure or is repriced at the lender's then-prevailing terms.

So there are three questions to ask of any fixed-rate offer, and the answers are all in the rate clause:

• Fixed for how long — a stated number of years, or the full tenure?
• What happens at the end of that period: automatic conversion to floating on the lender's benchmark and spread, or a fresh negotiation?
• What are the prepayment and foreclosure terms while the fixed period runs? This is where fixed and floating genuinely diverge, because the Reserve Bank's directions restricting prepayment and foreclosure charges are framed around floating-rate loans to individual borrowers, and a fixed-rate loan is a different case. The clause in your sanction letter governs.

A whole-tenure fixed rate is a real product and, for a household that needs absolute certainty about a monthly number, it can be worth what it costs. It simply is not what most fixed-rate offers are.

Hybrid structures, and the reset you forget about

Hybrid products fix the rate for an initial period and then float. They are attractive for a specific reason — the early years of an under-construction purchase, when you are also paying rent, are the years a household can least absorb an increase — and they carry a specific hazard, which is that the conversion date arrives long after everybody involved has stopped thinking about it.

If you take one, do two things on the day you sign. Put the conversion date in a calendar with a reminder a quarter ahead of it. And establish, in writing, exactly what happens on that date: which benchmark, what spread, and whether the spread was agreed at sanction or will be set at conversion. An unagreed spread is the whole risk of the product.

Switching: internal conversion versus refinancing

Two routes exist if you conclude your rate is out of line with the market.

Internal conversion. Your existing lender moves you to its current spread, or from fixed to floating, usually for an administrative fee. It is quick, involves no fresh security, and requires no new documents. It is also the route lenders would rather you took, which is a reason to ask for it before assuming you must move.

Refinancing to another lender. A new lender takes over the outstanding, which means a fresh credit appraisal, a fresh legal and technical appraisal on the property, new security documents, and the transfer of the original title documents between the two lenders. The saving has to be worth the process, and the honest comparison is the total interest over the residual tenure at each rate, net of every fee — not the difference between the two rates read aloud.

One warning worth stating plainly: a refinance is frequently offered alongside a top-up, and a top-up added to a refinance can quietly cancel the saving that motivated the move. Price the refinance on its own first.

What a rate change actually does to your schedule

It helps to see the mechanism rather than the headline. Your instalment is split each month between interest, computed on the outstanding principal at the applicable rate, and principal, which is whatever is left of the instalment after that.

When the rate rises and the instalment is held level, the interest slice grows and the principal slice shrinks. The balance therefore falls more slowly, and the loan takes longer to clear — which is the tenure extension, arriving quietly. When the rate falls and the instalment is held level, the reverse happens and the loan finishes early without anybody sending you a letter about it.

At the extreme, a level instalment can stop covering the interest accruing. The unpaid interest is then added to the balance, the balance grows, and the loan moves away from repayment rather than towards it. This is the failure mode the reset framework exists to prevent, and it is the reason the choice between raising the instalment and extending the tenure is presented to borrowers rather than made silently.

The defensive habit is simple. After every reset, look at two numbers on your statement: the outstanding principal, and the residual tenure. If the first is not falling and the second is not shrinking, ask the lender to explain why in writing.

The four lines in your sanction letter that matter

• The benchmark — which external rate your loan is linked to, named.
• The spread — the components, and the circumstances in which each may be revised.
• The reset frequency and dates — when your rate is recomputed.
• The reset consequence — whether the instalment or the tenure moves by default, and how you elect otherwise.

A borrower who can point to those four lines can audit their own loan for the next twenty years. A borrower who cannot is relying on a monthly debit being right. The terms above are defined in the property glossary, and the shorter answers are on the FAQ page.