Use Form 8933 to claim the section 45Q carbon oxide sequestration credit. Current Revision Form 8933PDF Instructions for Form 8933 (Print VersionPDF) Recent Developments None at this time. Other Items You May Find Useful All Form 8933 Revisions About Form 3800, General Business Credit Notice 2009-83, Credit for Carbon Dioxide Sequestration Under Section 45Q Other Current Products