Casual - 30 days from distribution of funds to nonresident beneficiaries.Nonresident Beneficiary Income Tax Estimated Payments ( Form DR 0104BEP).Annual - Payment due on April 15th of the following year or the 15th day of the fourth month following the close of the fiscal year.Fiduciary Income Tax Return Payment ( Form DR 0105 or DR 0900F).Fiduciary Income Tax Return Filing ( Form DR 0105).Quarterly - April 15, June 15, September 15, and January 15.Partnership & S Corporation Income Tax Estimated Payments ( Form DR 0106EP).Annual - Payment due April 15th of the following year or the 15th day of the fourth month following the close of the fiscal year.Partnership & S Corporation Composite Income Tax Payment ( Form DR 0106 or DR 0900P).Partnership & S Corporation Income Tax Return Filing ( Form DR 0106).Fiscal Year Quarterly - 15th day of the fourth, sixth, ninth, and twelfth months of the fiscal year.Calendar Year Quarterly - April 15, June 15, September 15, and December 15.C Corporation Income Tax Estimated Payments ( Form DR 0112EP).Annual - Payment due on April 15th of following year or the 15th day of the fourth month following the close of the fiscal year.C Corporation Income Tax Payment ( Form DR 0112 or DR 0900C).Annual - April 15th of the following year or the 15th day of the fourth month following the close of the fiscal year.C Corporation Income Tax Return Filing ( Form DR 0112).Quarterly - April 15, June 15, September 15, and January 15.Individual Income Tax Estimated Payments ( DR 0104EP).Annual - Payment due on April 15th of following year.Individual Income Tax Payment ( Form DR 0104 or DR 0900).Annual - Return due April 15th of the following year (under an extension, October 15th).Individual Income Tax Return Filing ( Form DR 0104).Monthly - 20th day of the following month.Aviation Fuel Sales Tax Return ( Form DR 1510).Quarterly - Last day of the month following the quarter.Passenger Mile Tax Return ( Form DR 0133).Quarterly - Can file between the first day of the next quarter, up to one year from date of purchase.Refund Claim for Exempt Use of Fuel ( Form DR 7118).Monthly- 26th day of the following month.Environmental Response Surcharge, PFAS Fee, LPG & NG Inspection Fee ( E-File Only).Monthly - 26th day of the following month.Fuel Distributor Tax Return ( E-File Only).Monthly - Last day of the following month.International Fuel Tax Agreement (IFTA) Tax Report ( Form DR 0122).Monthly Report of Excise Tax for Winery Direct-Shipper Permittees ( Form DR 0448)įuel Tax & International Fuel Tax Agreement (IFTA).Monthly - 20th day of the following month.

Monthly Report of Excise Tax for Alcohol Beverages ( Form DR 0442).Nicotine Products Tax Return ( E-File Only).Quarterly - 20th day of the month following the reporting period.Tobacco Products Tax Return ( E-File Only).Monthly - 10th day of the following month.Fuel Tax & International Fuel Tax Agreement (IFTA)ĭownload or Print the Colorado State Tax & Fee Due Date Guide.

Tax due date