To redeem SGB follow the process mentioned below
The investor shall inform the requisite authority i.e. bank, post office etc at least before 30 days of the coupon date about the redemption desired.The application for redemption can in no case be filed for later than one day before the coupon date.On successful acceptance of the application, redemption proceeds will be credited to the bank account of the investor.If any changes have taken place in the particulars like bank account number, email ids, etc then the investor must intimate the bank/SHCIL/PO promptly.