Recently read about CPF's accrued interest, and how one have to pay back when HDB flat is sold. If already finished paying the HDB loan, is it possible to repay the amount that was used to purchase the flat so that the accrued interest stop snow-balling? Let's say used CPF to pay for downpayment and the loan was serviced using all cash. Can one repay the CPF portion and hence stop the interest from accruing?