There is not any general public document for a particular "HDB accrued curiosity 90 27." This is likely an internal reference quantity or deal with. Accrued interest is actually a vital element of HDB flat ownership, especially for owners who used their CPF Ordinary Account (OA) to finance their property. Whenever you sell your HDB flat, you need to refund the principal quantity of CPF used for the downpayment, grants, and month-to-month installments, along with website the accrued desire, again into your CPF account. This fascination is the amount your CPF financial savings would have gained if that they had remained as part of your OA, calculated for the prevailing CPF OA curiosity price (currently two.5% per annum) and compounded annually. The refund is obligatory, and It truly is deducted from your revenue proceeds. You can Look at the precise quantity of CPF used and accrued desire about the CPF Site's "Home Possession" dashboard by logging in along with your Singpass.