Will UAE all entities owned by UAE, GCC and Residents be subject to corporate tax?

Yes – the UAE CT does not differentiate between nationality or residence. Juridical persons that are incorporated or resident in the UAE, or that have a permanent establishment in the UAE, will be subject to UAE CT. This applies irrespective of the residence and nationality of the individual founders or (ultimate) owners of the entity. Even though If you are a registered business for VAT, you will have to pay VAT and CT separately. If your business is not VAT registered you may still have to pay CT.