How home loan balance transfer savings are actually calculated
Every bank's balance transfer page tells you the new rate is lower. None of them show you the arithmetic that decides whether switching is actually worth it. Here it is.
Published 25 July 2026
The question isn't "is the new rate lower"
It almost always is — that's the pitch. The question that actually matters is whether the interest you save over the rest of your tenure is bigger than what it costs you to switch. Those are two different numbers, and the second one is the one lenders' marketing pages don't total up for you.
Step 1: the EMI difference
Take a ₹50 lakh loan with 15 years (180 months) remaining at 9.5%. Using the standard reducing-balance EMI formula (EMI = P·i·(1+i)n / ((1+i)n − 1), i = monthly rate), the EMI works out to roughly ₹52,211. Move the same outstanding balance and remaining tenure to a new offer at 8.5%, and the EMI drops to roughly ₹49,237 — a monthly saving of about ₹2,974.
Step 2: the switching cost, itemized
That monthly saving isn't free. A realistic switching cost for this loan looks something like:
- Processing fee at the new lender, ~0.5% of the loan: ₹25,000
- GST at 18% on that fee: ₹4,500
- MOD / mortgage stamp duty and registration (state-dependent, ~0.3% used here): ₹15,000
- Legal opinion, valuation, CERSAI and documentation: roughly ₹15,000 combined
Total: around ₹59,600. The stamp duty line is the one people miss most often — it varies by state and is easy to leave out of a back-of-envelope estimate, but it's frequently the single largest item after the processing fee.
Step 3: break-even
Break-even is the smallest number of months where cumulative EMI savings catch up to the total switching cost: ₹59,600 ÷ ₹2,974 per month ≈ 20 months. If you plan to hold the loan (or the property) for longer than that, the switch has paid for itself and everything after is savings. If you expect to sell, refinance again, or foreclose before then, the switch may not be worth it regardless of how attractive the new rate looks.
Step 4: net benefit over the full remaining tenure
Break-even answers "when." Net benefit answers "how much, in total." Run both schedules to completion: total interest at 9.5% over the remaining 180 months is about ₹43.98 lakh; at 8.5% it's about ₹38.63 lakh — interest saved of roughly ₹5.35 lakh over the life of the loan. Net that against the ₹59,600 switching cost and the net benefit is about ₹4.76 lakh.
Two things this example leaves out on purpose
It assumes you keep the same EMI amount and let the lower rate shorten your effective burden, and it assumes floating-rate terms — where RBI rules mean your current lender can't charge a foreclosure penalty. A fixed-rate loan usually carries a foreclosure penalty (typically 2–4% of the prepaid amount), which changes the switching-cost side of this math and should never be assumed away.
Run it on your own numbers
The math above is the same math the Balance Transfer Advisor runs, itemized and shown with every assumption used — so you're not taking our word for the break-even month, you can see how it was reached.
Important information
Valculator is an information and illustration tool. It is not a SEBI-registered investment adviser and not a lending institution.
Loan figures above are a comparative analysis of the offers you entered, not an endorsement of any lender or loan product.
Any investment or growth figures shown are illustrations at an assumed rate you can adjust — never a predicted or promised return. Valculator does not recommend specific mutual funds, securities, or investment products.
All calculations use the assumptions listed in "View assumptions" and the details you entered. Verify final figures with your lender before making a decision.