Repeal of specified tax laws triggers cancellation of registrations and requires return of licences within a three month compliance period. Repeal of specified state taxation enactments takes effect from the Act's commencement, expressly abrogating listed laws on betting, entertainment, luxuries, entry of goods, lotteries, special entry tax and value added tax. Certificates of registration, licences and permissions under the repealed Acts are cancelled with effect from the appointed day and must be returned to the competent authority within three months from that day.