701—6.6 (422) Retention of records and returns by the department. The director may destroy any records, returns, reports or communications of a taxpayer after they have been in the custody of the department for three years, or at such later time when the statute of limitations for audit of the returns or reports has expired. The director may destroy any records, returns, reports or communications of a taxpayer before they have been in the custody of the department for three years provided that the amount of tax and penalty due has been finally determined.
This rule is intended to implement Iowa Code section 422.68.