It's possible that you could have lost your National Savings Certificate or NSC, as they are popularly called. An investor can apply for a duplicate certificate as follows.
An investor should apply in the prescribed form for duplicate certificate in respect of lost, stolen, destroyed, mutilated or defaced certificates (NC29).
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The application shall be accompanied by a statement showing particulars of certificates and furnish an indemnity bond in the prescribed form with one or more sureties or with a bank guarantee is required.
In case of mutilated or defaced certificates, no indemnity bond is required.
A National Savings Certificate or NSC as it's popularly known are issued at the post offices and are extremely secure instruments that help you get tax benefits under Section 80C of the Income Tax Act.
Compared to an NSC, the Public Provident Fund (PPF) has always been more popular on account of its tax-free interest. However, PPF has a maximum investment limit of Rs 70,000 per annum (this means the maximum amount one can invest in PPF every year is capped at Rs 70,000).