Ariz. Rev. Stat. § 42-1105 – Taxpayer identification, verification and records; retention

A. The federal taxpayer identification number, assigned pursuant to section 6109 of the internal revenue code, is the taxpayer identifier for purposes of the taxes administered pursuant to this article. Each person who is required to make a return, statement or other document shall include the identifier in order to secure the person's proper identification. If the return, statement or other document is made, electronically or otherwise, by another person on behalf of the taxpayer, the taxpayer shall furnish the identifier to the other person, and the person shall furnish both the taxpayer's identifier and the person's own identifier with the return, statement or document.
B. The department may prescribe by administrative rule alternative methods for signing, subscribing or verifying a return, statement or other document required or authorized to be filed with the department that have the same validity and consequence as the actual signature or written declaration of the taxpayer or other person required to sign, subscribe or verify the return, statement or other document. While the department is adopting a rule prescribing alternative methods for signing, subscribing or verifying a return, statement or other document, the director, by tax ruling, may waive the requirement of a signature for a particular type or class of return, statement or other document required to be filed with the department. This subsection does not apply if the alternative method for signing a return, statement or other document is an electronic signature. The department shall accept or require electronic signatures in the manner prescribed in section 42-1131. For purposes of this subsection, "tax ruling" has the same meaning prescribed in section 42-2052.
C. A person who is a return preparer or an electronic return preparer shall furnish a completed copy of the return, statement or other document to the taxpayer no later than the time the return, statement or other document is presented for the taxpayer's signature.
D. Except as provided in section 42-3010, every person who is subject to the taxes administered pursuant to this article shall keep and preserve copies of filed tax returns, including any attachments to the tax return, any signature documents used for the tax return, suitable records and other books and accounts necessary to determine the tax for which the person is liable for the period prescribed in section 42-1104. The books, records and accounts shall be open for inspection at any reasonable time by the department or its authorized agent.
E. Except as provided in section 42-3010, a return preparer or electronic return preparer shall keep copies of the return, statement or other document for six years for transaction privilege and use tax returns and four years for all other returns, statements and other documents following the date on which the return, statement or other document was due to be filed or was presented to the taxpayer for signature, whichever is later.
F. Except as provided in section 42-3010, the department may require by administrative rule electronic return preparers to keep for each prepared return, statement or other document the following documents for six years for transaction privilege and use tax returns and four years for all other returns, statements and other documents following the later of either the date on which the return, statement or other document was due to be filed with the department or was presented to the taxpayer for signature:
1. 1. The signature document or tax return form bearing the taxpayer's original signature in a manner prescribed by the department by administrative rule or tax ruling.
2. 2. Any attachments to the return, statement or other document required to be submitted to the department if the return, statement or other document had not been electronically transmitted to the department.
G. The operator of a swap meet, flea market, fair, carnival, festival, circus or other transient selling event shall maintain a current list of vendors conducting business on the premises as sellers. The list shall include each vendor name, business name and business address. On written notice, the department may require an operator to submit a copy of the list at any time to the department.
H. For at least the period of time prescribed by section 42-1104, the department shall retain any return, statement or other document as a record pursuant to sections 41-151.14, 41-151.15, 41-151.16, 41-151.17 and 41-151.19. Anything submitted with the return, statement or other document that is not required, authorized or requested by the department is not part of the record and may be destroyed, unless it is, at the department's reasonable discretion, of more than de minimis value. Copies of original documents of which the department reasonably expects the taxpayer has retained any originals are presumed to be of de minimis value for purposes of this section. If the department determines that any document that is not required, authorized or requested by the department pursuant to this subsection is of more than de minimis value, within ten days after receipt the department shall notify the taxpayer in writing or by electronic means of its intent to destroy the document. If the taxpayer requests the return of any document included in the notice, the department shall immediately comply, although the director may require the taxpayer to pay any shipping costs to return the document. If the taxpayer does not request the return of the documents within thirty days after the date on the notice or the taxpayer consents to the destruction of the documents, whichever occurs first, the department may destroy the documents included in the notice.