This question has baffled me for quite a long time. When you use your CPF money to service your housing loan, CPF will compute accrued interest on the amount you withdraw from CPF until you sell the house. The accrued interest reflects the amount of interest you would get in your CPF account had you not used it to service the loan. When you sell the house, the principal and accrued interest have to be returned to CPF. This raises several other related questions – should accrued interest affects the attractiveness of the housing purchase and is better to use CPF or cash to service the housing loan?
 
To better appreciate and answer these questions, it is best to consider a typical scenario and leave CPF out of the picture for the time being. Let us assume that you intend to purchase a HDB flat for $500K. HDB agrees to loan …