Quarterly estimated tax in Iowa (2026)

A sole proprietor in Iowa with $100,000 of profit pays the IRS about $5,032 a quarter, and owes $2,920 of Iowa 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).

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

IRS due	Income earned	IRS	Iowa due	Iowa
April 15, 2026	January 1 to March 31	$5,032	April 30, 2026	$657
June 15, 2026	April 1 to May 31	$5,032	June 30, 2026	$657
September 15, 2026	June 1 to August 31	$5,032	September 30, 2026	$657
January 15, 2027	September 1 to December 31	$5,032	February 1, 2027	$657
Year		$20,128		$2,628

Iowa payments cover 90% of this year's state tax of $2,920, split 25%, 25%, 25%, 25% (Form IA 1040ES). revenue.iowa.gov, checked Oct 23, 2026 Estimates assume a single-member business with no withholding.

Iowa estimated tax rules for 2026

If your Iowa tax after withholding comes to $1,000 or more, the state wants estimatesrevenue.iowa.gov, checked Oct 23, 2026.
Pay by April 30, 2026, June 30, 2026, September 30, 2026, February 1, 2027revenue.iowa.gov, checked Oct 23, 2026.
You avoid the penalty by paying 90% of this year's tax, or 100% of last year's (110% if last year's income topped $150,000)revenue.iowa.gov, checked Oct 23, 2026.
Send them with Form IA 1040ES, or pay on the state's website.

Payments at each profit

Profit	IRS each quarter	Iowa for the year
$50,000	$2,190	$1,039
$100,000	$5,032	$2,628
$150,000	$8,462	$4,217
$250,000	$14,931	$7,493
$500,000	$38,217	$15,929

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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