Self-Employment Tax in Kansas (2026)
Self-employment tax is 15.3% - 12.4% for Social Security up to the annual wage base plus 2.9% for Medicare - charged on 92.35% of your net self-employment earnings and reported on Schedule SE. Kansas has no separate self-employment tax, but the same profit is taxed again under the Kansas graduated individual income tax on Form K-40.
Quick Answer
- Federal SE tax rate
- 15.3% (12.4% Social Security + 2.9% Medicare)
- Taxable base
- 92.35% of net earnings from self-employment
- Federal form
- Schedule SE, attached to Form 1040; profit from Schedule C
- Kansas SE tax
- None - profit is taxed by the Kansas individual income tax (Form K-40)
- Estimated payments
- Federal Form 1040-ES; Kansas Form K-40ES
- Deduction
- One-half of SE tax is deductible on the federal return
What Self-Employment Tax Is and Who Pays It
Self-employment (SE) tax is the Social Security and Medicare tax paid by people who work for themselves. When you are an employee, your employer withholds Social Security and Medicare (FICA) from your paycheck and pays a matching share. When you are self-employed, you cover both the employee and employer shares yourself, which is why the combined rate is 15.3%. It is a federal tax collected by the IRS, not a Kansas tax. Every US resident who runs a sole proprietorship, works as an independent contractor, is a partner in a partnership, or is a member of a single-member LLC taxed as a disregarded entity generally owes it.
You owe SE tax if your net earnings from self-employment are $400 or more for the year. The tax funds your future Social Security retirement and disability benefits and your Medicare coverage, so paying it also builds your earnings record with the Social Security Administration. A Kansas freelancer, gig worker, consultant, or small-business owner reports this the same way a self-employed person in any other state does - the federal rules are uniform. What changes state to state is the income tax layered on top, which is where Kansas comes in. For the national explainer see self-employment tax.
The 15.3% Rate: Social Security and Medicare
The 15.3% rate breaks into two parts. The Social Security portion is 12.4% and applies only up to an annual ceiling called the Social Security wage base (also called the contribution and benefit base), which the Social Security Administration adjusts each year for inflation. Once your combined wages and net self-employment earnings pass that ceiling, the 12.4% stops. The Medicare portion is 2.9% and has no ceiling - it applies to all of your net self-employment earnings. Because the wage base changes annually, confirm the current figure on the SSA's contribution-and-benefit-base page before you calculate.
There is also an Additional Medicare Tax of 0.9% on earnings above $200,000 for single filers and $250,000 for married couples filing jointly. That surtax is figured separately on Form 8959, not on Schedule SE. Higher earners in Kansas should account for it when estimating what they owe. Note that self-employment tax is entirely separate from federal income tax and from Kansas income tax - it is possible to owe SE tax even in a year when income-tax liability is low.
How to Calculate SE Tax on 92.35% of Net Earnings
You do not pay SE tax on your gross revenue. First you compute net profit on Schedule C (revenue minus deductible business expenses). Then Schedule SE multiplies that profit by 92.35% to reach "net earnings from self-employment." The 7.65% reduction approximates the employer-side FICA that an employee would not be taxed on. You apply the 15.3% rate to that adjusted figure, subject to the Social Security wage-base ceiling.
A simplified example: suppose a Kansas consultant nets $60,000. Multiply by 0.9235 to get $55,410 in net earnings from self-employment. Because that is below the wage base, the full 15.3% applies, producing roughly $8,478 in SE tax. Half of that, about $4,239, is deductible on the federal return. The exact figures depend on the current wage base and your total wages, so use the Schedule SE instructions or the self-employment tax calculator to run your own numbers rather than relying on the illustration.
| Component | Rate | Applies to | Reported on |
|---|---|---|---|
| Social Security | 12.4% | Net SE earnings up to the annual wage base | Schedule SE |
| Medicare | 2.9% | All net SE earnings (no ceiling) | Schedule SE |
| Additional Medicare | 0.9% | Earnings over $200,000 / $250,000 | Form 8959 |
| SE tax deduction | 50% of SE tax | Adjustment to federal income | Schedule 1 (Form 1040) |
Reporting on Schedule SE and Form 1040
Self-employment tax is reported on Schedule SE (Form 1040), which you attach to your federal Form 1040. Your business profit comes from Schedule C (or Schedule F for farming, or a Schedule K-1 for partnership income). After Schedule SE calculates the tax, the total is carried to Schedule 2, and the deductible one-half is claimed as an adjustment to income on Schedule 1. You do not file Schedule SE with Kansas - it stays with your federal return - but the profit that drives it is also the profit Kansas taxes. If you have elected to have your LLC taxed as an S corporation, the dynamics change: wages you pay yourself are subject to FICA, while remaining profit distributions are not subject to SE tax, which is a key reason some owners consider that election once profits are consistent.
Kansas Income Tax on the Same Profit
Kansas does not impose a self-employment tax, but it does tax your business profit through the Kansas individual income tax. Your federal adjusted gross income is the starting point for the Kansas return (Form K-40), so the net profit from your Schedule C flows into Kansas taxable income after state modifications. Kansas uses a graduated rate structure administered by the Kansas Department of Revenue; because Kansas has adjusted its brackets and rates in recent legislative sessions, verify the current rates and bracket thresholds on the Department of Revenue's individual income tax page rather than assuming a figure.
The practical takeaway for a Kansas self-employed person is that one dollar of profit is taxed twice at the federal level (income tax plus SE tax) and once more by Kansas income tax. There is no Kansas credit that offsets the federal SE tax. Kansas residents file Form K-40; part-year and nonresident filers use the same form with a nonresident allocation. If you also collect Kansas sales tax on taxable goods or services, that is a separate registration and filing handled through the Department of Revenue and does not affect your SE tax. Learn more at business tax and see how entity choice interacts with tax on how to form an LLC.
Quarterly Estimated Taxes (Federal and Kansas)
Because no employer withholds tax from self-employment income, you generally must make estimated tax payments during the year to cover both income tax and SE tax. Federally, if you expect to owe $1,000 or more, you pay quarterly using Form 1040-ES. The payments are ordinarily due in mid-April, mid-June, mid-September, and mid-January of the following year; missing them can trigger an underpayment penalty. Kansas has a parallel system: Form K-40ES is used to make Kansas estimated payments, generally required when you expect to owe $500 or more to Kansas after withholding and credits.
A common approach is to set aside a percentage of each payment you receive - covering federal income tax, the 15.3% SE tax, and Kansas income tax - so the quarterly bills are funded. Confirm the current thresholds, safe-harbor rules, and due dates on the IRS estimated-taxes page and the Kansas Department of Revenue before you rely on them. See estimated taxes for the mechanics and the glossary for defined terms.
Deductions and Ways SE Tax Interacts With Your Return
The single most important offset is the deduction for one-half of SE tax. You subtract half of the SE tax as an adjustment to income on your federal return, which lowers your federal adjusted gross income - and because Kansas begins from federal AGI, it can modestly lower your Kansas tax too. Ordinary and necessary business expenses deducted on Schedule C reduce net profit, which reduces both SE tax and income tax at the source, so accurate expense tracking is the most direct lever. Contributions to a self-employed retirement plan, the self-employed health insurance deduction, and the qualified business income deduction can reduce income tax but do not reduce SE tax, which is always computed on net earnings before those items. If you operate through an EIN and are weighing structures, compare S-corp versus LLC treatment with a tax professional.
Frequently Asked Questions
How much is self-employment tax in Kansas?
The self-employment tax rate is 15.3% - 12.4% Social Security up to the annual wage base plus 2.9% Medicare - applied to 92.35% of net earnings. Kansas adds no separate SE tax, but the same profit is taxed by the Kansas individual income tax on Form K-40.
Does Kansas have its own self-employment tax?
No. Self-employment tax is a federal Social Security and Medicare tax filed on Schedule SE with the IRS. Kansas has none; instead your net profit flows into Kansas taxable income and is taxed under the state's graduated individual income tax.
What form reports self-employment tax?
You calculate it on Schedule SE and attach it to Form 1040. Business profit is figured first on Schedule C. The deductible one-half of SE tax is claimed as an adjustment to income on Schedule 1.
Do I have to pay quarterly estimated taxes in Kansas?
Generally yes. If you expect to owe $1,000 or more in federal tax, use Form 1040-ES. Kansas requires its own estimates on Form K-40ES when you expect to owe $500 or more to the state after withholding.
Is the self-employment tax deductible?
Yes. You may deduct one-half of your SE tax as an adjustment to gross income on the federal return. It lowers federal AGI, which also flows to the Kansas K-40 starting point, but it does not reduce the SE tax itself.
When does the extra 0.9% Medicare tax apply?
The Additional Medicare Tax of 0.9% applies to self-employment income above $200,000 for single filers or $250,000 for married filing jointly. It is on top of the 2.9% Medicare portion and is reported on Form 8959.
Related
- Self-employment tax (national explainer)
- Self-employment tax calculator
- Business tax overview
- Estimated taxes and quarterly payments
- S-corp vs LLC and self-employment tax savings
- How to get an EIN
- Kansas registered agent
- How much does a Kansas LLC cost?
- Self-employment tax in California (sibling)
- Self-employment tax in Connecticut (sibling)
Sources
- IRS - Self-Employment Tax (Social Security and Medicare Taxes) (15.3% rate; $400 threshold; 92.35% factor).
- IRS - About Schedule SE (Form 1040).
- IRS - About Schedule C (Form 1040) (net profit from a business).
- IRS - About Form 1040-ES, Estimated Tax for Individuals.
- IRS - Estimated Taxes ($1,000 federal threshold).
- IRS - Questions and Answers for the Additional Medicare Tax (0.9%; $200,000/$250,000).
- IRS - About Form 8959, Additional Medicare Tax.
- IRS - Publication 334, Tax Guide for Small Business.
- IRS - Deducting Business Expenses.
- Social Security Administration - Contribution and Benefit Base (Social Security wage base).
- Social Security Administration - If You Are Self-Employed (Publication No. 05-10022).
- Kansas Department of Revenue - Individual Income Tax (Form K-40; graduated rates).
- Kansas Department of Revenue - Individual Income Tax Forms (Form K-40ES estimated tax).
- Kansas Department of Revenue - Business Taxes (sales and use tax registration).
- Legal Information Institute (Cornell) - 26 U.S.C. Section 1401, Rate of tax.
- Legal Information Institute (Cornell) - 26 U.S.C. Section 1402, Definitions (net earnings from self-employment).
LegalGlass provides general information for educational purposes and is not a law firm or a substitute for advice from a licensed attorney or tax professional. Tax rates, wage bases, and thresholds change; verify current requirements with the IRS and the Kansas Department of Revenue before acting.