| 12-6.001 | Application of Rules |
| 12-6.002 | Conference Procedures for Notices of Intent to Make Audit Changes |
| 12-6.0023 | Conference Procedures for Delinquency Notices or Billings |
| 12-6.003 | Protest of Notices of Proposed Assessment Issued by the Department Which Result From an Audit |
| 12-6.0033 | Protest of Assessments Issued by the Department Regarding Tax Returns, Other Required Filings, and Billings |
| 12-6.005 | Criteria for Qualified Representatives |
| 12-6.006 | Standards of Conduct for Qualified Representatives |
| 12-6.030 | Conference Procedures for Notices of Intent to Make Refund Claim Changes |
| 12-6.032 | Protest of Notices of Proposed Refund Denial |