2024 Certified Economic Development Credit Schedule for Taxpayers with a Refund Certificate Instructions. Use this form to claim tax credits certified by the Office of Economic Development and International Trade (OEDIT) that were issued for Enterprise Zone or CHIPS Zone credits where the taxpayer was issued a refund certificate by OEDIT. For additional information about the CHIPS Refundable Tax Credit Program, please visit OEDIT.Colorado.gov/chips-refundable-tax-credit-program.