There isn't a general public history for a specific "HDB accrued interest ninety 27." This is likely an internal reference number or handle. Accrued desire is usually a significant ingredient of HDB flat possession, especially for proprietors who employed their CPF Normal Account (OA) to finance their residence. After you provide your HDB flat, you must refund the principal quantity of CPF used for the downpayment, grants, and month-to-month installments, together with the accrued fascination, back into your CPF account. This fascination is the amount your CPF discounts would have acquired if they had remained with your OA, calculated at the prevailing CPF OA fascination level (at present two.five% per annum) and compounded yearly. The refund is obligatory, and it's deducted through the gross sales proceeds. It is possible to Look at the precise quantity of CPF applied and accrued desire on the CPF Web site's more info "House Ownership" dashboard by logging in together with your Singpass.