There is not any community report for a certain "HDB accrued curiosity 90 27." This is probably going an inside reference range or deal with. Accrued curiosity is really a critical ingredient of HDB flat possession, especially for owners who used their CPF Everyday Account (OA) to finance their residence. If you market your HDB flat, you need to refund the principal quantity of CPF used for the downpayment, grants, and every month installments, more info combined with the accrued curiosity, again into your CPF account. This fascination is the amount your CPF savings would've attained if they had remained as part of your OA, calculated with the prevailing CPF OA interest level (at the moment 2.five% for each annum) and compounded yearly. The refund is obligatory, and It really is deducted from the gross sales proceeds. It is possible to Verify the precise volume of CPF utilized and accrued desire within the CPF website's "Household Ownership" dashboard by logging in with all your Singpass.