All Colorado State offices will closed Wednesday, June 19, 2024 in observance of Juneteenth. To see a list of State closures, please visit

Press Release

State reminds Coloradans of income tax filing deadline

LAKEWOOD, Tuesday, April 2, 2024 — As the income-tax-filing season nears its end, the Colorado Department of Revenue, Taxation Division reminds taxpayers that they need to file by April 15.

Taxpayers who miss the deadline will receive an automatic, six-month extension, to Oct. 15 to file a return. However, there is no extension to pay the tax due. This means taxpayers who need to remit funds to the state will need to pay 90% of their tax liability before April 15 to avoid penalties.  

New, free, online and self-paced: Sales Tax Fundamentals course now available to help Colorado business owners

LAKEWOOD, Tuesday March 26, 2024 - Business owners looking to level-up their sales tax knowledge have reason to rejoice.

In an effort to educate business owners, the Business Support division of the Colorado Office of Economic Development and International Trade (OEDIT) and the Colorado Department of Revenue (DOR) released a free, 16-part Sales Tax Fundamentals online educational course on Tuesday.

Colorado Taxation Division releases tips to help taxpayers prevent fraud

LAKEWOOD, Tuesday March 5, 2024 - Prevent fraud this tax filing season with advice from the Colorado Department of Revenue (CDOR), Taxation Division.

The Division offers the following tips to help ease taxpayers’ minds as they prepare to file state income tax returns. The top security tips are:

State announces it is processing 2023 income tax returns

LAKEWOOD, Monday, February 12, 2024 — Taxpayers can now file income tax returns for 2023 and the Colorado Department of Revenue, Taxation Division has a few tips to make the process easier and help Coloradans receive their returns as quickly as possible.

Revenue Online up and running after service interruption

LAKEWOOD, Tuesday Jan. 16, 2024 -- The Colorado Department of Revenue, Taxation Division is pleased to report that Revenue Online (ROL) is operational after a service interruption  Tuesday morning.

The Taxation Division is still determining the cause of the service interruption.

The Taxation Division appreciates Coloradans patience and understanding during this time.