Social security certificates pay a maturity lump sum with annual interest and deemed reinvestment through year nine. Rule 16 provides that on expiry of a certificate's maturity period the holder, or on death the nominee or legal heir, is entitled to a lump sum inclusive of interest: Rs. 1,500 for Rs. 500 certificates and Rs. 3,000 for Rs. 1,000 certificates. Annual interest accrues as specified in the Table and interest accruing up to the end of the ninth year is deemed reinvested and aggregated with the face value.