The concept of HUF under Hindu law as well as Income-tax Act, 1961 is the same. As stated earlier, HUF is purely a creature of law and cannot be created by an act of parties (except in case of adoption and reunion). A HUF is a fluctuating body, its size increases with birth of a male member in the family and decreases on death of a member of the family. Females go and come into HUF on marriage. In case of a sole male Hindu, strictly speaking, a HUF comes to existence automatically upon his marriage. It has been held by the Hon'ble Supreme Court in Gowli Buddanna v/s. CIT [(1966) 60 ITR 293 (SC)] that to constitute a joint Hindu family, it is not necessary that there has to be more than one coparcener in the family; a husband and wife can validly constitute a HUF.