Would one assume that the attorney client communication would be waived in the following situations?
If the confidential communications are disclosed to third parties.
A: Waived, if disclosed by client. If disclosed by attorney without consent -- probable disbarment, and evidence inadmissible.
Disclosure to prevent a crime, tort, or fraud
A: No privilege attaches as to intended future crime -- attorney is free to disclose. Future tort or fraud disclosure varies substantially by jurisdiction.
Lawyers may disclose confidential information relating to the retainer where they are reasonably seeking to collect payment for services rendered.
A: No privilege where dispute is between attorney and client, and matters disclosed are material to the dispute.
Disclosure of information that is not confidential (in the public venue)
A: Attorney owes a separate duty of confidentiality, concerning knowledge surrounding client's circumstances. However, this is not part of the privilege, so while disclosure may subject attorney to discipline or malpractice action, the disclosure cannot be excluded from evidence.
Disclosure for the purpose of probate
A: Under the statutory attorney-client privilege, just as under the common law, an executor may waive the attorney-client privilege of his or her decedent. NY CPLR 4503. See also, Cal. Evid. Code 953(c).
Privilege related to tax practice
A: No special exception. However, a tax return, once filed is not within the scope of privilege, though Internal Revenue Code makes disclosure unlawful, except in specific circumstances. Note: In California, tax returns and any information contained there in are undiscoverable/privileged, except in family law actions.
Hope this helps.