Fixed vs Floating Home Loan Interest Rates: What a Rate Change Actually Costs

A fixed rate stays the same for your loan's term (or a defined period), giving predictable EMIs but usually starting a little higher than a floating rate. A floating rate moves with the lender's benchmark — in India, almost always a repo-linked rate that follows RBI policy — so your loan gets cheaper when rates fall and more expensive when they rise.

What actually happens when the rate changes

When a floating rate moves, most lenders keep your EMI the same at first and quietly extend your tenure instead — you only see the EMI itself rise once the tenure extension hits the lender's cap. Either way, the underlying cost is the same: more of your future payments go toward interest than they would have at the old rate. The worked example below shows the EMI-recompute version — the same rate change, but with the tenure held fixed and the EMI adjusted instead, which is what the Floating Rate Simulator on the calculator itself models.

A worked example

Take a ₹50L loan at 8.5% over 20 years — the same loan used throughout these guides. Suppose the rate rises to 9.5% starting in year 5 and stays there for the rest of the tenure:

The EMI rises from ₹43,391 to ₹46,141 a month — and over the life of the loan, that one-point rate increase adds ₹5.28L in total interest, on top of what the loan would have cost at the original rate.

Why people still choose floating

Floating rates usually start lower than fixed rates on the same loan, and RBI rate cycles move in both directions — a floating-rate borrower who took a loan before a rate-cutting cycle benefits automatically, with no refinancing needed. Fixed rates trade that upside away for certainty. Most Indian home loans are floating by default for exactly this reason, but it's worth knowing what a rate rise would actually cost you before assuming it won't matter.