Is the Udhiyah obligatory upon the husband and wife separately if both of them are working?

The Udhiyah (sacrifice) is a Sunnah, not an obligation, according to the majority of scholars. It is prescribed for those who are able to perform it, whether male or female. It is permissible for a man to include his wife in the reward of the Udhiyah, based on the statement of Abu Ayyub al-Ansari: "A man used to sacrifice a sheep on behalf of himself and his household." There is no harm if each of them offers a separate sacrifice.