You should attach to the return a copy of the relevant power of attorney or letter of authorization if this is the first time you act as agent.

假如你是首次以代理人身份代业主签署报税表，你必须把有关物业的授权书副本，随报税表提交。

youdao

As a matter of fact, it is only a technical matter for some malicious guys to obtain a copy of his target's ID card, and make a fake authorization document.

事实上，对于一些坏人来说，获取本人的身份证复印件或是授权书只是技术问题。

youdao

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