Scheme allows borrowers to carry forward the discount level they have reached to their new home.
HSBC borrowers with either the bank's Singapore Interbank Offered Rate-pegged (Sibor) loyalty package or its Sibor-pegged relationship- based loan package will now not lose any of the time-related loyalty discounts they have earned when moving house.
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For the relationship-based home loan package, HSBC customers see a year-on-year decrease in the interest spread until the 10th year, when it hits zero.
The Sibor-pegged loyalty home loan deal cuts the interest rate spread at the end of every anniversary year, up to the third year of the loan.
The two packages - both launched last year - are designed to reward longer-term borrowers.
Typically, loans pegged to the Sibor - the rate at which banks lend cash to one another - have either flat or increasing interest rate spreads.
Under the new arrangement, if a customer has a Sibor-pegged relationship-based loan and sells his property in the third year of the loan when the interest rate is 1.69 per cent - Sibor plus 1 per cent, assuming Sibor is 0.69 per cent - he can enjoy a first-year loan interest rate of 1.69 per cent on his new property.
From there, he can go on to enjoy the year-on-year decrease in interest rate spreads offered by his original Sibor-pegged deal with the bank.
Mr Sebastian Arcuri, HSBC's head of personal financial services, said that loan portability meant customers can enjoy the flexibility to redeem their loan, buy a new home and still benefit from a lower interest rate spread year on year.
He added that for customers to enjoy this benefit, they must have a total balance of $100,000 and above in deposits, investments and insurance with HSBC. They must also finance their new home loan, on a completed property, within six months.