Under current regulations, a practitioner may charge a contingent fee for:

Preparing an original return.

Advice in connection with an amended return.

Advice in connection with a position taken on an original return.

Advice on investments.

A firm cannot hire such an employee for one year following the employee leaving government service.

A firm cannot hire such an employee for two years following the employee leaving government service.

For any member of a firm that hires the former government employee to represent or knowingly assist in certain matters, it may be necessary for the firm to isolate the former government employee in such a way to ensure that he cannot assist in the representation.

Individuals involved in regulation drafting that are nonspecific may not represent a client who is affected by those regulations.

A practitioner cannot have exercised due diligence if the practitioner relies on the work product of another person without taking all steps to verify its correctness.

A practitioner must exercise due diligence in the correctness of oral or written representations made by the practitioner to clients with reference to any matter administered by the Internal Revenue Service.

A practitioner must exercise due diligence in the correctness of oral or written representations made by the practitioner to the Department of the Treasury.

A practitioner must exercise due diligence in the correctness of oral or written representations made by the practitioner with reference to any matter made to the Internal Revenue Service or the Department of the Treasury.