There is a specific circular for NSC for allowing deduction of interest on NSC
Person to whom deduction is admissible - The deduction under section 80C can be claimed by the person who has contributed the monies out of his income chargeable to tax. It can be claimed by the first-named person in a joint holding if the first-named person has so contributed the amount.
The deduction under section 80C is to be given to the person who has purchased the NSCs out of his income chargeable to tax.
The interest accruing on the subscripttion to the NSCs will be included in the hands of the person who has subscribed from his income chargeable to tax.
The amount of interest re-invested will satisfy the test of having been paid out of income chargeable to tax to get the NSC and so will be entitled to deduction under section 80C.
Where subscripttion to the NSCs in the name of any member of the HUF, is shown by the family to have been made out of its income chargeable to tax and the beneficial ownership in such certificates vests in the family, the family would be entitled to a deduction under section 80C with reference to such contribution.
The interest accrued would be included in the hands of the persons who purchased the NSC out of their income chargeable to tax.—Circular : No. 405 [F. No. 178/1/84-IT(A-I)], dated 15-1-1985 as corrected by Circular : No. 418 [F. No. 178/1/84-IT(A-I)], dated 2-5-1985.
whereas there is no such circular for FD. Also a time deposit has both option i. e. interest can be compounded and not be compounded i. e. interest amount can be withdrawn periodically. So there is no uniformity in the time deposits whereas in case of NSC interest is reinvested compulsorily.