Iowa: what each business structure costs a year

At $100,000 profit, an LLC taxed as an S corp costs $4,770 a year less than a sole proprietorship in Iowa. All figures are 2026 tax and fees.

$4,770 a year

less as an LLC taxed as an S corp than as a sole proprietorship in Iowa, at these numbers. That includes the state's pass-through entity tax election.

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

Structure

Yearly cost

vs yours

To set up

Sole proprietorship yours

$25,285

Itemized: $25,285

Self-employment taxirs.gov, 2026 rates	$14,130
Federal income taxirs.gov, 2026 rates	$8,235
State income taxrevenue.iowa.gov, checked Oct 23, 2026	$2,920
Yearly cost	$25,285

Single-member LLC

$25,294

+$9

$50

Itemized: $25,294

Biennial Reportlegis.iowa.gov, checked Oct 23, 2026	$15
Self-employment taxirs.gov, 2026 rates	$14,127
Federal income taxirs.gov, 2026 rates	$8,233
State income taxrevenue.iowa.gov, checked Oct 23, 2026	$2,919
Yearly cost	$25,294

LLC taxed as an S corp lowest

$20,515

−$4,770

$50

Itemized: $20,515

Biennial Reportlegis.iowa.gov, checked Oct 23, 2026	$15
Payroll tax on your salaryirs.gov, 2026 rates	$6,366
Payroll service and tax return (estimate)	$1,800
Iowa pass-through entity tax, paid by the company (elected)legis.iowa.gov, checked Oct 23, 2026	$2,085
Federal income taxirs.gov, 2026 rates	$9,262
State income tax, after the PTET creditrevenue.iowa.gov, checked Oct 23, 2026	$987
Yearly cost	$20,515

S corporation

$20,527

−$4,758

$50

Itemized: $20,527

Biennial Reportlegis.iowa.gov, checked Oct 23, 2026	$30
Payroll tax on your salaryirs.gov, 2026 rates	$6,366
Payroll service and tax return (estimate)	$1,800
Iowa pass-through entity tax, paid by the company (elected)legis.iowa.gov, checked Oct 23, 2026	$2,085
Federal income taxirs.gov, 2026 rates	$9,259
State income tax, after the PTET creditrevenue.iowa.gov, checked Oct 23, 2026	$987
Yearly cost	$20,527

C corporation

$29,619

+$4,334

$50

Itemized: $29,619

Biennial Reportlegis.iowa.gov, checked Oct 23, 2026	$30
Payroll tax on your salaryirs.gov, 2026 rates	$6,366
Payroll service and tax return (estimate)	$2,000
State corporate income taxrevenue.iowa.gov, checked Oct 23, 2026	$3,007
Federal corporate income tax (21%)irs.gov, 2026 rates	$10,848
Federal income taxirs.gov, 2026 rates	$4,909
State income taxrevenue.iowa.gov, checked Oct 23, 2026	$2,459
Yearly cost	$29,619

What these figures count

State income tax, and state taxes on the business itself: franchise, LLC, S corp, gross receipts and excise taxes.
Social Security and Medicare on both sides of an owner salary, federal unemployment tax and the state's new-employer rate.
The 20% qualified business income deduction with its income limits and the professional-service rule.
Yearly report fees, and a cost you can change for payroll and the business tax return.

Many S corp calculators leave out state taxes and the QBI deduction, which can make the election look better than it is.

When an S corp election pays in Iowa

Electing S corp tax treatment for an LLC starts to pay in Iowa at about $50,000 of profit, with the default salary and $1,800 a year for payroll and the extra tax return.

An S corp in Iowa can elect to pay the state's income tax itself, a pass-through entity tax of 3.8%, and the owner gets a credit for it. The company deducts it on the federal return, so it is not held to the SALT cap. The calculator uses it when it lowers the totallegis.iowa.gov.

Profit	Sole prop	LLC	LLC as S corp	C corp
$30,000	$5,629	$5,640	$7,068	$7,571
$50,000	$10,886	$10,897	$10,661	$13,163
$75,000	$17,532	$17,542	$13,956	$20,208
$100,000	$25,285	$25,294	$20,515	$29,619
$150,000	$42,293	$42,303	$34,726	$50,050
$200,000	$59,882	$59,893	$49,727	$69,784
$300,000	$102,326	$102,330	$82,291	$110,940

Single filer, no other income, revenue taken as 1.5 times profit, default salary. The lowest cost in each row is marked.

State fees and taxes in Iowa

	LLC	Corporation
Filing to form	$50Certificate of Organization	$50Articles of Incorporation	legis.iowa.gov
Yearly report	Biennial Report, $30 every two years	Biennial Report, $60 every two years	legis.iowa.gov
Report due	January 1 to April 1 of odd-numbered years	January 1 to April 1 of even-numbered years

Iowa taxes personal income at a flat 3.8% (2026). revenue.iowa.gov
C corporations pay 5.5% to 7.1% of net income. revenue.iowa.gov
Iowa follows the federal S corp election.
New employers pay state unemployment tax of 1% on the first $20,400 of each employee's wages. That applies to an owner's salary from an S or C corp. workforce.iowa.gov
Biennial report is $30 online through Fast Track Filing or $45 on paper.
Statutory biennial report fee is $60 for profit corporations.

Not in the calculator: Most Iowa school districts add a school district income surtax, a percentage of the resident's Iowa income tax, and some counties add an emergency medical services surtax. Not modelled.

Switching calculators for Iowa

By profession in Iowa

Questions

Is an S corp worth it in Iowa?

On these figures, from about $50,000 of profit. At $100,000 an LLC taxed as an S corp costs $20,515 a year against $25,294 for a plain LLC, $4,779 less. The saving comes from paying Social Security and Medicare tax on a salary instead of on all profit.

How much does an LLC cost per year in Iowa?

The state charges Biennial Report, $30 every two years. Forming one costs $50.

Does Iowa recognise the S corp election?

Yes. The federal election carries over with no separate state form. S corporations are pass-through. Optional pass-through entity tax election and nonresident composite tax not modelled.

What income tax does Iowa charge?

Iowa taxes personal income at a flat 3.8% (2026). C corporations pay 5.5% to 7.1% of net income.

How this page models Iowa (1)

Iowa's $40 per filer personal exemption credit ($80 for joint filers) is a tax credit, which the schema cannot express, so the flat 3.8% rate is applied to federal taxable income without it.

Sources checked 2026-10-23. Each figure links to the state or IRS page it comes from.

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