- Delegation Order 25-15, Authority of the Return Preparer Office to Perform Certain Tax Administration Functions (PDF)
- Delegation Order 25-16, Authority of the Office of Professional Responsibility to Perform Certain Functions Concerning Practice before the Internal Revenue Service (PDF)
- Delegation Order 25-17, Authority to Decide Protests of Enrollment or Designation Denials Under Treasury Department Circular No. 230 (PDF)
- Delegation Order 25-18 (Rev. 3), Authority to Authorize Students at Low Income Taxpayer Clinics (LITCs) and Student Tax Clinic Programs (STCPs) to Practice before the Internal Revenue Service (PDF)
