Colorado Quarterly Tax Calculator 2026
Rates reviewed · Colorado Department of Revenue
Colorado has a low flat income tax rate of 4.4% on federal taxable income. Estimated payments required if you expect to owe $1,000 or more.
Your Information
Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.
Colorado quarterly tax questions
How much is the quarterly tax for freelancers in Colorado?
Freelancers in Colorado pay federal self-employment tax (15.3% of net self-employment income), federal income tax at their bracket, and Colorado income tax of 4.4% flat. This calculator applies 4.4% as a representative Colorado rate for freelancer-level income; the top marginal rate is 4.4% flat.
When are quarterly estimated taxes due in Colorado for 2026?
Colorado follows the federal estimated tax schedule for 2026 — Q1: April 15, 2026, Q2: June 16, 2026, Q3: September 15, 2026, Q4: January 15, 2027. The Q3 payment is due September 15, 2026.
Do I have to make Colorado estimated tax payments?
Colorado requires estimated payments once you expect to owe $1,000 or more in state income tax for the year. The state form is Form DR 0104EP. Payments can be made online through Revenue Online. Filing and paying federal estimated tax does not cover the state amount — they are separate payments.
Where do I pay Colorado estimated taxes online?
Colorado accepts online estimated tax payments through Revenue Online, run by the Colorado Department of Revenue. Federal payments go through IRS Direct Pay or EFTPS separately.
What happens if I underpay estimated taxes in Colorado?
The IRS charges an underpayment penalty based on the amount underpaid and the number of days late. Paying at least 90% of this year's tax or 100% of last year's (110% if your AGI exceeded $150,000) meets the federal safe harbour. Colorado applies its own interest and penalty on late or short state payments.
State payments are administered by the Colorado Department of Revenue via Revenue Online.
Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.