Interest on NSC is only taxable and not the whole maturity amount
Since NSC is for 6 years every year accrued interest on the NSC is taxable as per the NSC table but the same interest is also allowed u/s 80C as deduction (Subject to 1 Lakh limit) since interest earned is reinvested but 6th year interest is not allowed as deduction since it dosenot get reinvested