DDonald GLevel 1Forum|Forum|4 years agoJune 9, 20224015Forum|Forum|4 years agoJune 9, 20220 replies4 viewsThe following diagnostic is generating: Any taxpayer claiming the Colorado source capital gain subtraction must include a signed affidavit with the return. A copy of federal form Schedule D and/or form 4797 should be included with the Colorado source capital gain affidavit. Solution: Help Article COIndividual