Colorado. Taxation. Sales tax Sales tax collections in Colorado averaged more than $4 million monthly during fiscal year ending June 30th. RMN . July 9, 1961, p.67 Gov. signs sales tax bill. Post April 21, 1961 p.3 1 Explanation of city and state deductions. RMN Jan. 14, 1963 p.14 Plan to raise 2% sales tax to 3% submitted.:. RIN June 9, 1963 p.5 7 million tax bill on tabacco proposed. Post Feb. 24, 1963 p.1 0