Businesses | Department of Revenue - Taxation

All State Offices will be closed on Monday, January 19, 2026 for Martin Luther King Jr. Day.

Tax Types

Sales & Use Tax

Business Income Tax

Withholding Tax

Excise & Fuel Tax

Property Taxation (DOLA)

Business E-File Options

Revenue Online (ROL)

Sales & Use Tax System (SUTS)

Revenue Online Sales Tax Spreadsheet

Additional Tax Information

Climate Friendly Tax Incentives

Resources for Businesses

Cover of the Colorado Sales Tax Guide

Guidance Publications

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Tax Education Webinars

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Watch How-To Videos

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Sign Up for Email Alerts

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Tax Fraud Prevention