Self-Employment Tax in Arizona (2026)

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 6, 2026 · Last updated Aug 6, 2026

Self-employment tax in Arizona consists of federal self-employment (SE) tax, which is 15.3% for Social Security and Medicare, plus Arizona state income tax. Arizona does not impose a separate state-level self-employment tax. Both federal SE tax and Arizona income tax are typically paid through quarterly estimated tax payments.

Self-Employment Tax in Arizona: An Overview

For self-employed individuals in Arizona, "self-employment tax" refers to two distinct components: the federal self-employment tax and Arizona state income tax. There is no specific state-level self-employment tax in Arizona; instead, self-employment income is subject to the state's general individual income tax rates. Understanding both federal and state obligations is crucial for proper tax planning and compliance.

The federal self-employment tax covers Social Security and Medicare contributions for individuals who work for themselves. It is equivalent to the FICA taxes (Social Security and Medicare) that employees and employers each pay. For 2026, the federal self-employment tax rate is 15.3% on net earnings from self-employment, up to certain income limits for Social Security. Arizona income tax applies to your net self-employment earnings after allowable federal deductions, including one-half of your federal self-employment tax.

Both federal self-employment tax and Arizona state income tax are generally paid throughout the year via estimated tax payments. Failure to pay enough tax through withholding or estimated payments can result in penalties from both the IRS and the Arizona Department of Revenue (ADOR). This guide details the components, calculation, payment methods, and specific considerations for self-employment tax in Arizona.

Federal Self-Employment Tax

The federal self-employment tax is a tax consisting of Social Security and Medicare taxes primarily for individuals who work for themselves. It is similar to the Social Security and Medicare taxes withheld from the pay of most wage earners. The federal self-employment tax rate is 15.3% on net earnings from self-employment, which is broken down as follows:

• Social Security: 12.4% on net earnings up to an annual limit (e.g., $168,600 for 2024, subject to annual adjustment).
• Medicare: 2.9% on all net earnings from self-employment, with no income limit. An additional Medicare tax of 0.9% may apply to earnings above certain thresholds ($200,000 for single filers, $250,000 for married filing jointly).

You are generally subject to federal self-employment tax if your net earnings from self-employment are $400 or more. This tax is calculated on IRS Schedule SE (Form 1040), Self-Employment Tax. The calculation starts with your gross income from your trade or business, subtracts allowable business expenses to arrive at net earnings, and then applies a statutory adjustment: you multiply your net earnings by 92.35% to determine the amount subject to SE tax. One-half of your self-employment tax is deductible when calculating your adjusted gross income (AGI) for federal income tax purposes, which also impacts your Arizona taxable income.

For more details on the federal component, see our comprehensive guide on self-employment tax.

Arizona State Income Tax on Self-Employment Income

Arizona does not impose a separate self-employment tax. Instead, net earnings from self-employment are included in your Arizona gross income and are subject to the state's individual income tax rates. Arizona generally conforms to federal adjusted gross income (AGI), meaning that the same deductions and adjustments used to arrive at your federal AGI (including the deduction for one-half of federal self-employment tax) will typically reduce your income for Arizona tax purposes.

For tax year 2026, Arizona's individual income tax structure is a single flat rate. As of 2025, the rate is 2.5% for all taxable income. This flat tax rate simplifies the calculation compared to graduated tax brackets. However, taxpayers should verify the current year's rate with the Arizona Department of Revenue (ADOR) as legislative changes can occur.

Self-employed individuals in Arizona may also be eligible for various state tax credits that can reduce their overall tax liability. These credits can include credits for taxes paid to other states, certain business-related credits, and other specific individual income tax credits. It is important to review the ADOR's current list of available credits to determine eligibility.

Paying Estimated Taxes in Arizona

Since self-employment income is not subject to employer withholding, both federal self-employment tax and Arizona state income tax must be paid through estimated tax payments. This ensures that you pay your tax liability as you earn income throughout the year, avoiding underpayment penalties. The tax year is divided into four payment periods, with specific due dates for each:

If a due date falls on a weekend or holiday, the deadline is extended to the next business day. You can use IRS Form 1040-ES, Estimated Tax for Individuals, to calculate and pay your federal estimated taxes. For Arizona state estimated taxes, you will use Arizona Form 140ES, Estimated Tax Payment, and make payments directly to the Arizona Department of Revenue. The ADOR offers various payment methods, including online payments, mail, and electronic funds transfer. For more information, see our guide on estimated tax payments.

Self-Employment Tax for Arizona LLCs

The way an Arizona Limited Liability Company (LLC) is taxed for self-employment purposes depends on its federal tax classification. By default, the IRS treats a single-member LLC as a disregarded entity (a sole proprietorship for tax purposes) and a multi-member LLC as a partnership. In both these default classifications, the LLC itself does not pay income tax; instead, profits and losses "pass through" to the owners' personal tax returns.

• Single-Member LLC: The sole owner reports the LLC's income and expenses on IRS Schedule C (Form 1040), Profit or Loss From Business. The net profit from Schedule C is then subject to federal self-employment tax on Schedule SE. This net profit also flows to the owner's Arizona individual income tax return.
• Multi-Member LLC: The LLC files IRS Form 1065, U.S. Return of Partnership Income, and issues Schedule K-1s to each member, detailing their share of the LLC's income, deductions, and credits. Each member then reports their share of the net earnings on their individual Form 1040 and pays federal self-employment tax on that income via Schedule SE. This income is also subject to Arizona state income tax.
• LLC Electing S-Corporation Status: An LLC can elect to be taxed as an S-corporation by filing IRS Form 2553. In this scenario, the owner(s) can be paid a reasonable salary, which is subject to FICA taxes (Social Security and Medicare) withheld from payroll, similar to an employee. Any remaining profits distributed to owners as dividends are generally not subject to self-employment tax. This can potentially reduce overall self-employment tax liability, but it adds payroll responsibilities and requires careful planning to ensure salaries are "reasonable" as defined by the IRS. For more information, see S-Corp vs. LLC.

Regardless of the LLC's tax classification, the individual owner is ultimately responsible for paying the federal self-employment tax and Arizona state income tax on their share of the business's net earnings.

Deductions and Credits for Self-Employed in Arizona

Self-employed individuals in Arizona can take advantage of various deductions and credits to reduce their overall tax burden:

• Federal Self-Employment Tax Deduction: As mentioned, one-half of your federal self-employment tax is deductible as an adjustment to income on your federal Form 1040. This deduction reduces your federal AGI, which in turn reduces your taxable income for Arizona state income tax purposes.
• Business Expenses: Ordinary and necessary business expenses are deductible against your gross self-employment income. This includes home office expenses, business mileage, supplies, professional development, business insurance, and qualified health insurance premiums. Keeping meticulous records is essential.
• Retirement Contributions: Contributions to self-employed retirement plans like a SEP IRA, SIMPLE IRA, or Solo 401(k) are tax-deductible, reducing both federal and Arizona taxable income.
• Arizona Tax Credits: The Arizona Department of Revenue offers various individual income tax credits that self-employed individuals may qualify for. These can include credits for taxes paid to other states (to prevent double taxation if you earn income outside Arizona), certain business-related credits, and other specific personal credits. Reviewing the ADOR's current tax credit forms and instructions is recommended.
• Small Business Income Tax Credit: Arizona may offer specific credits aimed at small businesses, which could benefit self-employed individuals. Eligibility criteria and availability can change, so consulting the ADOR website or a tax professional is advisable.

Proper utilization of these deductions and credits can significantly lower your effective tax rate. It is advisable to consult with a tax professional to ensure you are claiming all eligible deductions and credits.

Underpayment Penalties

Both the IRS and the Arizona Department of Revenue can impose penalties if you do not pay enough tax throughout the year through estimated payments or withholding. The general rule for avoiding federal underpayment penalties is to pay at least 90% of your current year's tax liability or 100% of your prior year's tax liability (110% if your prior year's AGI was over $150,000), whichever is smaller. For Arizona, similar rules apply, generally requiring you to pay at least 90% of your current year's tax or 100% of your prior year's tax.

Penalties are calculated based on the amount of underpayment and the period it remained unpaid. You may be able to avoid penalties if you meet certain exceptions, such as if you had an unexpected increase in income late in the year, or if you are a farmer or fisherman. If you anticipate difficulty in meeting your estimated tax obligations, it is best to consult with a tax professional or contact the IRS and ADOR for guidance.

Frequently Asked Questions

What is the self-employment tax rate in Arizona?

Arizona does not have a separate state self-employment tax. Self-employed individuals pay the federal self-employment tax rate of 15.3% (12.4% for Social Security up to the annual limit, and 2.9% for Medicare) on net earnings, plus Arizona state income tax at applicable rates.

How do I pay self-employment tax in Arizona?

You pay federal self-employment tax and Arizona state income tax through estimated tax payments. For federal taxes, use Form 1040-ES. For Arizona, use Form 140ES, Estimated Tax Payment, and make payments quarterly to the Arizona Department of Revenue.

Is self-employment tax deductible in Arizona?

Yes, one-half of your federal self-employment tax is deductible when calculating your adjusted gross income (AGI) for federal income tax purposes. This federal deduction also reduces your taxable income for Arizona state income tax, as Arizona generally conforms to federal AGI.

What is the minimum income for self-employment tax in Arizona?

You generally owe federal self-employment tax if your net earnings from self-employment are $400 or more. For Arizona state income tax, filing thresholds depend on your filing status and deductions, but there is no specific minimum income for self-employment tax itself at the state level.

Do I pay self-employment tax if I have an LLC in Arizona?

If your Arizona LLC is a single-member LLC (disregarded entity) or a multi-member LLC (partnership), its profits pass through to your personal income. You, as the owner, will pay federal self-employment tax on your share of the net earnings, plus Arizona state income tax. If the LLC elects S-corporation status, you may pay yourself a reasonable salary subject to FICA taxes, and distributions may not be subject to SE tax.

Related

• Self-Employment Tax: A Complete Guide (cluster hub)
• Self-Employment Tax Calculator
• Estimated Tax Payments
• Business Tax Overview
• S-Corp vs. LLC for Tax Purposes
• How to Form an LLC in Arizona
• Self-Employment Tax in California (sibling)

Sources

1. IRS - Self-Employment Tax (Social Security and Medicare Taxes).
2. IRS - About Form 1040-ES, Estimated Tax for Individuals.
3. IRS - About Schedule SE (Form 1040), Self-Employment Tax.
4. IRS - Estimated Taxes.
5. Arizona Department of Revenue - Individual Income Tax Forms (Form 140ES).
6. Arizona Department of Revenue - Individual Income Tax Rates (2.5% flat rate).
7. Arizona Department of Revenue - Individual Income Tax Credits.
8. Arizona Department of Revenue - Small Business Income Tax Credit.
9. Arizona Department of Revenue - Credit for Taxes Paid to Other States.
10. Arizona Department of Revenue - Estimated Tax Payments.
11. Cornell Law School Legal Information Institute - 26 U.S. Code § 1401 - Rate of tax (Federal SE Tax).
12. Cornell Law School Legal Information Institute - 26 U.S. Code § 164 - Taxes (Deductibility of taxes).
13. Cornell Law School Legal Information Institute - 26 U.S. Code § 6654 - Failure by individual to pay estimated income tax (Underpayment penalties).
14. Arizona Revised Statutes - Title 43, Taxation of Income (Arizona income tax law).

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. Laws, fees, and thresholds change; verify current requirements with the IRS and Arizona Department of Revenue before acting.