You have asked whether allowing clients to use credit cards to pay their legal fees and expenses would violate the Rules of Professional Conduct. Although some within the profession have opined that the use of credit cards may appear to be "unprofessional", there is no Rule that is implicated by the use of credit cards. Accordingly, the Committee has long taken the position, albeit informally, that such use of credit cards is appropriate.
It is important to note that the American Bar Association's Standing Committee on Ethics and Professional Responsibility has recently issued a formal written opinion on this issue. On July 7th, the ABA Committee issued Formal Opinion 00-419 in which it withdrew several ethics opinions, all over 25 years old, that had been interpreted to restrict a lawyer's ability to accept credit card payments of their fees.
In summary, this Committee finds that allowing clients to use credit cards to pay legal fees and expenses does not constitute a violation of the Rules of Professional Conduct.