Adjustable-Rate Mortgage (ARM)

An Adjustable-Rate Mortgage (ARM) is a home loan with an interest rate that changes periodically based on a benchmark index (like SOFR or MCLR) after an initial fixed-rate period.

Key Features:

• Initial fixed period (e.g., 3, 5, 7 years) with lower interest rate
• After that, rate adjusts at regular intervals (annually, semi-annually)
• Rate adjustments are tied to a market index plus a fixed margin
• Often includes rate caps to limit how much the rate can rise per adjustment or over the loan’s life

ARMs are ideal for borrowers expecting:

• To sell or refinance before the adjustment period
• Short-term homeownership
• An interest rate environment where rates may fall

A young couple in Bengaluru takes a home loan of 60 lakh from a bank to buy a flat in Electronic City. The bank offers them an adjustable-rate mortgage where the interest rate is linked to the repo rate. In the first year, the repo rate is low, so their EMI stays manageable at around 48,000 per month. After a year, the RBI increases the repo rate, and the bank adjusts their loan rate upward. Their EMI rises to about 51,500 per month even though the loan amount remains the same.

A year later, the repo rate is reduced again due to economic conditions, and the bank accordingly lowers their mortgage rate. Their EMI drops slightly, giving them some relief. Throughout the loan tenure, their EMI keeps changing depending on RBI rate movements. This becomes a typical adjustable-rate mortgage because the couple does not have a fixed EMI; instead, their payments move up or down based on changes in benchmark interest rates.

• 1980s (U.S.): ARMs introduced to counter high inflation
• 2000s: Widely used in subprime lending (often with aggressive terms)
• Post-2008 GFC: Tighter regulations and better disclosures were mandated
• 2020s: ARMs regained popularity as fixed rates climbed in response to inflation