What’s actually involved
A balance transfer means a new lender pays off your outstanding loan with the current lender, and you continue repaying - now to the new lender, typically at a lower rate. This isn’t free: most current lenders charge a foreclosure or prepayment charge for closing the loan early, and most new lenders charge a processing fee to originate the transferred loan. Both costs need to be weighed against what the lower rate actually saves you.
Why timing matters more than the rate gap alone
Loans are typically structured so that early EMIs are weighted more toward interest, and later EMIs are weighted more toward principal - a standard feature of reducing-balance amortization. This means the bulk of your interest savings from a lower rate are realized earlier in the loan’s life. Transferring a loan with five years remaining on a twenty-year tenure captures meaningfully less benefit than transferring the same rate gap with eighteen years remaining, simply because there’s less interest left to save regardless of the rate.
A rough way to think about it
Compare two numbers: the total interest you’d pay over the remaining tenure at your current rate, versus the total interest at the new rate plus the transfer costs (foreclosure charge plus new processing fee). If the second number is meaningfully lower, the transfer is worth considering. If the gap is small, or if you’re already well into the loan’s tenure, the paperwork and cost may not be worth what’s actually left to save.