Tax Expenditure Evaluation Oil and Gas Severance Tax Deduction for Transportation Costs & Oil and Gas Severance Tax Deduction for Manufacturing and Processing Costs Subject: Fiscal Policy & Taxes Natural Resources & Environment Published: July 16, 2020 Agency: Office of the State Auditor Report No. 2020-TE16 Note: A more recent publication was issued in May 2025. Click HERE to access the May 2025 memo. Download Document