NSS offers an interest rate of 9% whereas NSC offers 8.50% and 8.8% interest rate for NSC VIII Issue and NSC IX Issue respectively.
Income tax rebate for both the invested principal as well as the earned interest up to RS. 9000/- is offered by NSS whereas interest on NSC will be taxable.
Interest shall be compounded annually in case of NSS but it is half yearly for NSC.
Nobody can avail a loan from bank pledging NSS as security. But you can get a loan from bank keeping NSC as collateral security.