Colorado taxes

Colorado taxes personal income at one flat rate, 4.4%, starting from your federal taxable income. A sole proprietor owes no separate business tax. LLCs, corporations and most registered partnerships pay a $25 periodic report fee every year. C corporations pay 4.4% of their Colorado income, and there is no minimum corporate tax.

Personal income tax

Colorado residents file Form DR 0104, due April 15, 2026. You automatically get six more months to file, to October 15, 2026. The rate is 4.4% for every filer.

Colorado starts from your federal taxable income, after the federal standard or itemized deduction, so it has no standard deduction or personal exemption of its own. Above $300,000 of federal income, it adds back the part of your federal deduction over $12,000 ($16,000 married filing jointly). It also adds back the federal deduction for business meals.

Colorado has a refundable state child tax credit, a family affordability tax credit and a state earned income tax credit. In some years it also refunds its TABOR surplus through the income tax return.

Return

Form DR 0104

Due date

April 15, 2026, with an automatic extension to October 15, 2026

Rate

4.4% on all Colorado taxable income

Starting point

Federal taxable income

High-income add-back

Federal deduction over $12,000 ($16,000 joint), once federal income is over $300,000

Social Security, age 65 and over

Not taxed

Social Security, age 55 to 64

Not taxed up to $75,000 of income ($95,000 joint); above that, up to $20,000 is not taxed

United States government interest

Not taxed

Sole proprietor

A sole proprietor with no LLC owes Colorado nothing at the business level. The periodic report is filed by registered entities only, so there is no report and no fee.

Your business profit is taxed on your own Form DR 0104. Forming an LLC would start the $25 a year.

Single-member LLC

Every Colorado LLC files a periodic report with the Secretary of State each year and pays $25, whatever it earned. The fee rose from $10 on July 1, 2024, so older guidance understates it.

The due month is the LLC's own periodic report month, shown on its summary page, and the report can be filed from two months before to two months after it. Filing late adds a $50 penalty. The LLC's profit is taxed on your own Form DR 0104.

Partnership

A Colorado partnership files Form DR 0106, due April 15. The profit passes through to the partners, who report it on their own returns.

If any partner lives outside Colorado, the partnership must file a composite return for them in Part II of the same Form DR 0106 and pay their Colorado tax. A partner can opt out by filing form DR 0107 in time, and partners that are corporations or partnerships are not included. The old withholding form, DR 0108, was dropped from 2024.

An LLC, a limited liability partnership, or a limited partnership formed after July 26, 2009 also files the $25 periodic report each year. A general partnership does not.

S corporation

A Colorado S corporation files Form DR 0106, the same return as a partnership, due April 15. The profit passes through to the shareholders, who report it on their own returns.

If any shareholder lives outside Colorado, the corporation must file a composite return for them on its Form DR 0106 and pay their Colorado tax, unless the shareholder files form DR 0107 in time. If the composite tax will be more than $5,000, quarterly estimated payments are due on it.

It also pays the $25 periodic report fee every year, whatever it earned.

C corporation

A C corporation files Form DR 0112 and pays 4.4% of its Colorado income. The return is due May 15 for a calendar year, a month later than the partnership and S corporation return. A corporation selling into other states counts only its Colorado share, measured by sales, with each sale counted where the customer is.

Colorado has no minimum corporate tax, so in a year with no profit the $25 periodic report fee is all it charges. That fee is owed on top of the income tax.

Return

Form DR 0112, due May 15 for a calendar year

Corporate income tax

4.4% of Colorado income

Minimum tax

None

Multi-state profit

Colorado sales over total sales, counted where the customer is

Periodic report fee

$25 a year, to the Secretary of State

Estimate your state tax

Pick your business type and enter this year's numbers to see the state business tax Colorado charges. It assumes all your sales are in Colorado.

An estimate for planning, not tax advice.

Sources

• Colorado Book 104, 2025 Individual Income Tax Filing Guide
• Colorado Individual Income Tax Guide (Revised January 2026), Part 7, Original returns
• sos.state.co.us Business Organizations fee schedule (periodic report $25; late filing penalty $50)
• sos.state.co.us Business FAQs, periodic reports (what a reporting entity is; report-month window; delinquency)
• sos.state.co.us news release 17 June 2024 (fee increase from $10 to $25)
• tax.colorado.gov DR 0112 Book, C corporation return: who must file, and the 15th-day-of-the-fifth-month due date
• tax.colorado.gov DR 0106 Book, partnership and S corporation return: composite return requirement and the elimination of DR 0108
• tax.colorado.gov DR 0112 2025 Colorado C Corporation Income Tax Return, line 19
• tax.colorado.gov C Corporation Apportionment

Last reviewed August 2026.