Please Help: income tax

One of my client written approach us to show my office address in his income tax return for any communication purpose. Because he & his wife is working as an agent. And they are mostly out of time in office address. And due to that his refund order and other income tax paper is returned due to non availability in house. I want to know that whether I could give my office address in his income tax return for communication purpose. Whether it is within the law of ICAI/ Income tax act or not. He also give power of attorney to us. Pls reply urgent.
My Email ID id as under
casunilagrawal@yahoo.com