You are the tax partner of a regional CPA firm. You are approached by one of you

You are the tax partner of a regional CPA firm. You are approached by one of your clients who asks you the meaning of the accountant/client privilege. Your client says he thought that there was just an attorney client privilege and is now confused and doesn’t understand how the privilege works.
Please write a 300 word memo that describes to your client the meaning and significance of the accountant/client privilege.