How a card balance transfer actually works
The technique
The promo is a window, not a rate cut
A balance transfer moves an outstanding balance to another card, or to a transfer facility on the same issuer, at a reduced rate for a fixed period, commonly three to six months. The rate that matters is not the promotional one but the one the balance reverts to when the window closes, usually the card's standard rate, around 3.5 percent a month plus GST. The fee is charged upfront and not refunded if you clear early.
Three things happen on the day the transfer goes through. The original card's balance falls to zero, so its limit is free again. The new card carries the balance at the promotional rate, with the fee on top. And a clock starts that most people do not put in their calendar.
During the window, the receiving card's minimum-due rules usually still apply, so you are asked for a small percentage each month even at 0 percent, and paying only that leaves most of the balance to hit the standard rate when the window closes. New purchases on that card are typically outside the promo and accrue at full rate, often with no interest-free period while a transferred balance is outstanding. So the arithmetic on a transfer is about how much is left on the last day of the window, not the promotional rate.
- The fee on ₹1 lakh at 2 percent is ₹2,000, plus 18 percent GST, ₹2,360: a little over half of one month's interest at the standard rate (₹4,130), which is why a transfer looks free at a glance






