A BIR Certificate to be accomplished and issued in case of increase or decreases in exemption, change of status, change in the person of employer, change in the type of employment, acquiring employment after having registered as engaged in business or exercise of profession, change in the working status of the spouse, execution of the "waiver to claim the Additional Exemption" by the husband, or revocation of the previously executed "waiver to claim the Additional Exemption" by the husband.