How much self-employment tax will I owe in Colorado?

Self-employment tax is federal, not state, the rate is 15.3% (12.4% Social Security + 2.9% Medicare) on 92.35% of your net self-employment income. On top of that you'll owe federal income tax and, if applicable, Colorado state income tax. Enter your net income above to see the full breakdown.

Do I have to pay quarterly estimated taxes?

If you expect to owe $1,000 or more in federal tax for the year, yes, the IRS wants estimated payments on April 15, June 15, September 15, and January 15. Many states with income tax require the same. Missing a quarter triggers an underpayment penalty even if you pay in full by April.

Can I deduct half of my self-employment tax?

Yes. The employer-equivalent half of your SE tax (7.65% of the SE base) is deductible from your adjusted gross income. This calculator applies that deduction automatically before computing federal and state income tax.

Is this calculator accurate enough for filing?

It is an estimate, good for quarterly planning, pricing your rates, and setting aside tax reserves. For your actual return, use tax software or a CPA; individual credits, deductions, and multi-state work can shift the final number materially.

What is the Colorado state income tax rate for freelancers?

Colorado uses a flat 4.4% rate for all personal income, including 1099 freelance income. There is no separate state self-employment tax and no local income tax in any Colorado city.

Do Denver freelancers pay city income tax?

No. Denver does not levy a personal income tax, despite the metro area's size. Colorado freelancers in Denver, Boulder, or Colorado Springs pay federal + the 4.4% CO state tax only.

Colorado Self-Employment Tax Calculator