Quarterly estimated tax in Colorado (2026)

A sole proprietor in Colorado with $100,000 of profit pays the IRS about $5,032 a quarter, and owes $3,381 of Colorado income tax for the year. Put in your own profit to get the four payments and their dates.

$5,032 a quarter

to the IRS. Four payments make $20,128 for the year, which meets 90% of this year's tax. This year's federal tax on this profit: $22,365 (income tax $8,235, self-employment tax $14,130).

Colorado, 2026: $100,000 profit, single filer

IRS due	Income earned	IRS	Colorado due	Colorado
April 15, 2026	January 1 to March 31	$5,032	April 15, 2026	$592
June 15, 2026	April 1 to May 31	$5,032	June 15, 2026	$592
September 15, 2026	June 1 to August 31	$5,032	September 15, 2026	$592
January 15, 2027	September 1 to December 31	$5,032	January 15, 2027	$592
Year		$20,128		$2,368

Colorado payments cover 70% of this year's state tax of $3,381, split 25%, 25%, 25%, 25% (Form DR 0104EP). tax.colorado.gov, checked Oct 24, 2026 Estimates assume a single-member business with no withholding.

Colorado estimated tax rules for 2026

If your Colorado tax after withholding comes to $1,000 or more, the state wants estimatestax.colorado.gov, checked Oct 24, 2026.
Pay by April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027tax.colorado.gov, checked Oct 24, 2026.
You avoid the penalty by paying 70% of this year's tax, or 100% of last year's (110% if last year's income topped $150,000)tax.colorado.gov, checked Oct 24, 2026.
Send them with Form DR 0104EP, or pay on the state's website.

Payments at each profit

Profit	IRS each quarter	Colorado for the year
$50,000	$2,190	$935
$100,000	$5,032	$2,367
$150,000	$8,462	$3,797
$250,000	$14,931	$6,749
$500,000	$37,997	$14,346

A sole proprietor or single-member LLC, single filer, no withholding, paying 90% of this year's federal tax and the state's own safe-harbor share.

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