While looking for something else, came across this on the Texas State Board of Public Accountancy website. This topic (what has to be given to a client) has been discussed a lot on here and TaxAlmanac. While this is for Texas CPAs, probably all states have similar rules. This is from the section dealing with records & workpapers. Interesting what gets classified as "client records" that a lot of folks call "their workpapers". From the Texas Board Rules Sec 501.76(a)(2):
(2) A person's work papers, to the extent that such work papers include records which would ordinarily constitute part of the client's or former client's books and records and are not otherwise available to the client or former client, shall also be furnished to the client within a reasonable time (promptly, not to exceed 20 business days) after the client has made a request for those records. The person can charge a reasonable fee for providing such work papers. Such work papers shall be in a format that the client or former client can reasonably expect to use for the purpose of accessing such work papers. Work papers which constitute client records include, but are not limited to:
(A) documents in lieu of books of original entry such as listings and distributions of cash receipts or cash disbursements;
(B) documents in lieu of general ledger or subsidiary ledgers, such as accounts receivable, job cost and equipment ledgers, or similar depreciation records;
(C) all adjusting and closing journal entries and supporting details when the supporting details are not fully set forth in the explanation of the journal entry; and
(D) consolidating or combining journal entries and documents and supporting detail in arriving at final figures incorporated in an end product such as financial statements or tax returns.
Work papers, regardless of format, are those documents developed by the person incident to the performance of his engagement which do NOT constitute "records that must be returned to the client" in accordance with subsection (a) of this section. (formatting added).