Start with the current loan
Find the outstanding balance, interest rate, remaining loan period and lock-in end date. Check whether a legal subsidy must be repaid if you leave.
Ask about repricing
Your current bank may offer a different package. Compare its fees and future rates with offers from other lenders.
Use the same loan period
Extending the loan can lower monthly payments while increasing total interest. Compare offers over the same remaining period.
Include all switching costs
Deduct legal fees, valuation charges, penalties and subsidy repayments from the expected interest saving. Then consider how long you plan to keep the loan.