Thanks Sanjay ji for sharing the file. Very useful
This file states that if the HUF consists only of Husband and wife, then the tax burden will be on the individual only and not on HUF. so there's no benefit of such an HUF.
Minimum number of coparceners. An HUF can consist of just two members, one of whom is a coparcener. However, for tax purposes, the income of such an entity would not be taxed in the hands of the HUF; it would be taxed in the hands of the sole coparcener. For an entity to be taxed as an HUF, it should have at least two coparceners. Thus, the income of an HUF consisting of a husband and wife would not be taxed in the hands of the HUF, except in cases where the husband has received funds on the partition of a larger HUF.