Self-Employment Tax in Iowa (2026)
Self-employment tax is a federal 15.3% tax (12.4% Social Security up to the annual wage base plus 2.9% Medicare) paid to the IRS on Schedule SE. Iowa has no separate state self-employment tax, but the same net business profit is subject to Iowa individual income tax at a flat 3.8% for tax year 2026.
Quick Answer
- SE tax rate
- 15.3% (12.4% Social Security + 2.9% Medicare)
- Paid to
- The IRS, on Schedule SE with Form 1040
- Taxable base
- 92.35% of net profit
- Filing threshold
- $400 or more in net self-employment earnings
- Iowa SE tax
- None - Iowa has no separate self-employment tax
- Iowa income tax
- Flat 3.8% for tax year 2026
- Estimated tax
- Quarterly to the IRS; Iowa on a comparable schedule
What Self-Employment Tax Actually Is
Self-employment tax is a federal tax, not a state tax. It is the self-employed version of the Social Security and Medicare taxes that an employer and an employee split on a W-2 paycheck. Because a sole proprietor, partner, or LLC member has no employer to pay the other half, the IRS collects both halves from the same person. The rate is set by 26 U.S.C. § 1401, the income it reaches is defined in § 1402, and the tax is figured on Schedule SE and filed with your federal Form 1040.
The combined rate is 15.3%: 12.4% for Social Security (old-age, survivors, and disability insurance) and 2.9% for Medicare (hospital insurance). The Social Security portion stops once your combined wages, tips, and net earnings for the year reach the annual Social Security wage base, which the Social Security Administration resets each year. The Medicare portion has no ceiling — it applies to every dollar of net self-employment earnings.
One detail catches almost everyone the first time. You do not pay 15.3% on gross revenue, and you do not pay it on your full net profit either. You pay it on 92.35% of net earnings from self-employment, a figure that approximates the deduction an employer would take for its share of payroll tax. You then deduct one-half of the resulting self-employment tax in computing adjusted gross income on your federal return, which lowers income tax — not the SE tax itself.
Who Owes It
You must file Schedule C and Schedule SE and pay self-employment tax if your net earnings from self-employment were $400 or more for the year. That threshold is per person, not per business, and it applies whether or not you owe any income tax. The obligation reaches:
- Sole proprietors and independent contractors who report profit on Schedule C, including gig work and 1099-NEC income.
- Single-member LLC owners, because the IRS treats a single-member LLC as a disregarded entity by default — forming the LLC changes nothing about SE tax. See single-member LLCs.
- General partners and most multi-member LLC members, on their distributive share of ordinary business income reported on Schedule K-1.
An S corporation shareholder is the main exception. Wages an S corp pays its owner-employee run through regular FICA withholding, and the remaining profit distributed to the shareholder is not self-employment income. That is the heart of the S-corp vs LLC trade-off, and it only holds up if the corporation pays the owner reasonable compensation first.
The Additional Medicare Tax
On top of the 2.9% Medicare component, an Additional Medicare Tax of 0.9% applies to self-employment income above a filing-status threshold: $200,000 for single filers and heads of household, $250,000 for married filing jointly, and $125,000 for married filing separately. The thresholds are not indexed for inflation and are not prorated for a partial year. Unlike the base Medicare tax, no portion of the Additional Medicare Tax is deductible in figuring adjusted gross income.
How to Calculate It
The arithmetic is short once you have a net profit figure:
- Start with net profit from Schedule C, or your share of ordinary business income from Schedule K-1.
- Multiply by 0.9235 to get net earnings from self-employment.
- Apply 12.4% to that figure up to the annual Social Security wage base, and 2.9% to all of it.
- Add the 0.9% Additional Medicare Tax on the portion above your filing-status threshold.
- Deduct one-half of the base self-employment tax on Form 1040 in figuring adjusted gross income.
Our self-employment tax calculator runs the same steps if you would rather not do them by hand, and the national self-employment tax guide walks through the federal rules in more depth.
Does Iowa Have Its Own Self-Employment Tax?
No. Iowa does not impose a separate state self-employment tax, and there is no Iowa equivalent of Schedule SE. The 15.3% is federal and is paid to the IRS. What Iowa does tax is the income the self-employment produced: your net business profit flows from your federal return onto the Iowa individual income tax return, where Iowa's individual rate applies.
That distinction matters when you budget. A profitable Iowa sole proprietor is looking at two separate bills each year — federal self-employment tax plus federal income tax to the IRS, and Iowa individual income tax to the Iowa Department of Revenue — not one blended rate.
Iowa Individual Income Tax on Business Profit
Iowa now applies a flat individual income tax rate of 3.8%. The Iowa Department of Revenue confirmed in its 2026 rate announcement that for tax year 2026 all levels of taxable individual income are subject to that single rate, following the flat-tax legislation Iowa enacted in May 2024 (Senate File 2442). Iowa's older graduated brackets have been phased out.
Because Iowa's rate is flat, the state calculation is unusually simple: Iowa taxable income multiplied by 3.8%, after Iowa's own adjustments, deductions, and credits. There is no separate Iowa surtax on self-employment earnings, though some Iowa school districts levy a local income surtax collected on the state return.
| Tax | Who collects it | Rate | How it is reported |
|---|---|---|---|
| Self-employment tax | IRS (federal) | 15.3% on 92.35% of net profit | Schedule SE with Form 1040 |
| Additional Medicare Tax | IRS (federal) | 0.9% above threshold | Form 8959 with Form 1040 |
| Federal income tax | IRS (federal) | Graduated brackets | Form 1040 |
| Iowa individual income tax | Iowa Department of Revenue | 3.8% flat (2026) | Iowa individual return |
| Iowa sales tax | Iowa Department of Revenue | Applies to taxable sales | Sales tax permit and returns |
Iowa Registration and Sales Tax
Self-employment itself does not require an Iowa business registration. Two things commonly do. If you sell taxable goods or services, you need an Iowa sales tax permit from the Iowa Department of Revenue before you make taxable sales. If you hire employees, you need Iowa withholding and unemployment accounts. Entity filings — forming an LLC, filing an Iowa certificate of organization, or appointing an Iowa registered agent — go to the Iowa Secretary of State instead, and are separate from tax registration. If you operate as a sole proprietorship in Iowa, none of the Secretary of State filings are required to start.
Quarterly Estimated Payments
Nobody withholds tax from a client payment, so the IRS expects self-employed people to pay as they earn through quarterly estimated tax using Form 1040-ES. The federal due dates in a normal year are April 15, June 15, September 15, and January 15 of the following year. Each payment covers income tax and self-employment tax together; there is no separate SE-tax coupon. Iowa expects estimated payments on a comparable schedule when your Iowa liability is large enough to require them, and the Iowa Department of Revenue publishes an annual interest rate on underpayments — 10.0% per year beginning January 1, 2026. Underpaying federally can trigger an estimated-tax penalty even if you settle up by the April filing deadline.
Legitimate Ways to Reduce It
There is no way to opt out of self-employment tax, but there are three lawful levers. The first is deductions: SE tax is computed on net profit, so every ordinary and necessary business expense you correctly claim reduces the base. The second is retirement contributions — useful, but understand that they generally reduce income tax rather than the SE-tax base. The third, and the only structural one, is an S-corporation election on Form 2553: the corporation pays the owner a reasonable salary subject to FICA, and remaining profit is not self-employment income. That election adds payroll filings and accounting cost, so it usually pays off only once profit comfortably exceeds a defensible salary.
Be skeptical of anything that promises to eliminate the tax entirely. Arrangements built on mischaracterizing wages, routing income through a shell entity, or claiming a blanket exemption from Social Security have a long record of failing on audit. The durable playbook is unglamorous: keep clean books, claim every real deduction, and revisit entity choice as profit grows.
Frequently Asked Questions
Does Iowa have a self-employment tax?
No. Self-employment tax is a federal 15.3% Social Security and Medicare tax paid to the IRS on Schedule SE. Iowa imposes no separate state self-employment tax and has no state Schedule SE. Your net business profit is still subject to Iowa individual income tax, which is a flat 3.8% for tax year 2026.
How much is self-employment tax in Iowa?
The federal rate is 15.3% of net earnings: 12.4% for Social Security up to the annual wage base plus 2.9% for Medicare with no cap. You pay it on 92.35% of net profit, figured on Schedule SE. Iowa adds its flat 3.8% individual income tax on the same profit, but no separate Iowa self-employment tax.
What is the Iowa income tax rate on self-employment income?
Iowa applies a flat individual income tax rate of 3.8%. The Iowa Department of Revenue confirmed that for tax year 2026 all levels of taxable individual income are subject to that single rate, following the flat-tax law Iowa enacted in May 2024. Some Iowa school districts also levy a local income surtax collected on the state return.
Do I have to pay self-employment tax if I made under $400?
No. Federal law requires Schedule SE and self-employment tax only when net earnings from self-employment are $400 or more for the year. Below that, no SE tax is due, though you may still need to file a federal or Iowa income tax return and report the income.
When are estimated taxes due for Iowa self-employed people?
Federal estimated payments on Form 1040-ES are generally due April 15, June 15, September 15, and January 15 of the following year, and each payment covers income tax and self-employment tax together. Iowa expects estimated payments on a comparable schedule when your Iowa liability is large enough to require them.
Does forming an LLC in Iowa lower self-employment tax?
No, not by itself. The IRS treats a single-member LLC as a disregarded entity by default, so profit stays on Schedule C and remains subject to self-employment tax. Only an S-corporation election on Form 2553, which splits profit between reasonable wages and distributions, changes the SE-tax result.
Related
- Self-employment tax: the national guide
- Self-employment tax calculator
- Schedule C explained
- Iowa LLC tax filing requirements
- S-corp election in Iowa
- Sole proprietorship in Iowa
- How to form an LLC in Iowa
- Iowa business license requirements
- How to get an EIN
- Small business legal glossary
Sources
- IRS - Self-Employment Tax (Social Security and Medicare Taxes) (15.3% rate; $400 threshold; 0.9% Additional Medicare Tax thresholds).
- IRS - About Schedule SE (Form 1040).
- IRS - About Schedule C (Form 1040).
- IRS - Estimated Taxes (quarterly payment rules).
- IRS - About Form 1040-ES.
- IRS - Questions and Answers for the Additional Medicare Tax.
- IRS - Topic No. 554, Self-Employment Tax.
- IRS - Single Member Limited Liability Companies.
- Social Security Administration - Contribution and Benefit Base (annual Social Security wage base).
- Iowa Department of Revenue - IDR Announces 2026 Individual Income Tax and Interest Rates (3.8% flat rate; 10.0% annual interest rate from January 1, 2026).
- Iowa Department of Revenue - Iowa Tax Rate History.
- Iowa Department of Revenue - Businesses (registration, permits, withholding).
- Iowa Secretary of State - Business Services (entity filings).
- Cornell LII - 26 U.S. Code § 1401, Rate of tax.
- Cornell LII - 26 U.S. Code § 1402, Definitions.
- Cornell LII - Self-employment tax (Wex).
LegalGlass provides general information for educational purposes and is not legal advice, is not a law firm, and is not a substitute for advice from a licensed attorney or tax professional. Laws, fees, and thresholds change; verify current amounts with the IRS and the Iowa Department of Revenue before acting.