Ariz. Rev. Stat. § 28-2238 – Records; audits; interest; penalty

A. An owner whose application for proportional registration is accepted shall preserve the records on which the application is based for four years following the year or period on which the application is based. On request of the director, the owner shall either:
1. 1. Make records available to the director at the director's office for audit as to the accuracy of computations and payments and the assessment of deficiencies or allowances for credit.
2. 2. Pay the costs of an audit by the department at the applicant's home office.
B. The director may enter into agreements with agencies of other jurisdictions administering motor vehicle registration laws for joint audits of an owner whose application for proportional registration has been accepted.
C. The department shall not make an assessment for deficiency or a claim for credit for a period for which records are not required. Amounts that are found to be due and owing on audit bear interest of twelve per cent from the date they should have been paid until the date of actual payment. If the audit discloses a deliberate and wilful intent to evade the requirements of payment under section 28-2233, the department shall also assess an additional penalty of ten per cent of the amounts found to be due and owing on audit.