Deduction for housing loan principal repayment under 80c

No

since the same is repaid by the husband, it will be allowed to husband only u/s 80C of chapter VIA.

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No.

The deduction can not be allowed to your wife.

For deduction there are few criteria like you should own the house, loan should be granted in your name, the payment should be done from your account etc.

On the basis of above your wife can not avail the deduction u/s 80C.