What Is Interest Rate? The One Number That Moves Your Loans and Your Savings in Opposite Directions

An interest rate is the cost of borrowing money, or the reward for lending it, expressed as a percentage of the amount involved, usually over a year. If you borrow money, the interest rate is what you pay the lender for the use of their money. If you deposit money in a savings account or fixed deposit, the interest rate is what the bank pays you for the use of yours.

Every interest rate you encounter, whether on a home loan, a credit card, or a savings account, ultimately traces back to a small set of benchmark rates set by a country’s central bank, which in India is the Reserve Bank of India (RBI).

Where interest rates actually come from

The RBI sets a key benchmark called the repo rate, the rate at which it lends short-term funds to commercial banks. When the RBI raises the repo rate, borrowing becomes more expensive for banks, and banks generally pass that higher cost on to customers through higher loan rates. When the RBI cuts the repo rate, the opposite tends to happen. The RBI’s Monetary Policy Committee reviews and sets the repo rate at scheduled bi-monthly meetings, based primarily on its inflation target and broader economic conditions.

Most Indian retail loans (home loans, personal loans) taken after October 2019 are linked to an External Benchmark Lending Rate (EBLR), which is directly tied to the repo rate, meaning your loan’s interest rate can move up or down within a defined period after the RBI changes its rate.

Nominal rate versus effective (real) rate

The nominal interest rate is the stated rate before accounting for compounding frequency or inflation. The effective annual rate accounts for how often interest compounds, which can make the actual return or cost slightly higher than the nominal rate suggests. Separately, the real interest rate subtracts inflation from the nominal rate, which tells you how much actual purchasing power you’re gaining or losing. A savings account paying 6% interest during a year when inflation runs at 5% is only growing your real wealth by roughly 1%, even though the nominal number looks like a solid return.

Fixed versus floating interest rates

A fixed interest rate stays the same for an agreed period (or the entire loan tenure), giving predictability regardless of what happens in the broader rate environment. A floating interest rate moves with a benchmark, offering the possibility of paying less if rates fall, but also the risk of paying more if rates rise. Which is better depends on your risk tolerance and your view of where rates are headed, though predicting rate direction reliably is notoriously difficult even for professional economists.

Why the same rate change affects you differently depending on which side you’re on

A rate hike is bad news if you’re a borrower with a floating-rate loan (your EMI or tenure typically increases) but good news if you’re a saver with a fixed deposit maturing soon (new deposits will likely offer better rates). This is why interest rate news gets covered so heavily, it doesn’t affect everyone the same way, and most people are simultaneously a borrower (home loan, credit card) and a saver (deposits, provident fund) at different points.

Bottom Line

An interest rate is the price of money over time, set at the top by the central bank and passed down through banks to every loan and deposit product you use. Understanding whether a rate is fixed or floating, and what it looks like after adjusting for inflation, matters more for your actual financial outcome than the headline percentage alone.

This article is for general information and isn’t personalized financial advice.

Sources

• Reserve Bank of India – Monetary Policy