Tax is generally based on net business profit, not gross receipts. Rates, thresholds, and deadlines change by tax year, so confirm figures with the IRS and the Arizona Department of Revenue (ADOR) before you file.
Key Takeaways
- Three separate taxes can apply: federal self-employment tax, federal income tax, and Arizona income tax.
- Eligible business expenses reduce net profit, which lowers more than one tax.
- Federal and Arizona estimated payments are separate from your annual return.
- Check IRS and ADOR guidance each year, since figures and forms change.
What Taxes Apply to Self-Employed Individuals in Arizona?
Federal self-employment tax
Self-employment (SE) tax is the Social Security and Medicare tax you pay on your net earnings. It totals 15.3%: 12.4% Social Security plus 2.9% Medicare. It usually applies once net earnings reach $400.
It commonly covers:
- Freelancers and independent contractors
- Gig workers
- Sole proprietors
- Single-member LLC owners
- Certain partners
Arizona income tax
Arizona has no separate state version of SE tax. Arizona Form 140 starts with your federal adjusted gross income (AGI) and applies state adjustments. Arizona's individual income tax is a flat 2.5% for tax years 2023 and later.
The tax year 2025 standard deduction is $15,750 for single filers, $31,500 for joint filers, and $23,625 for head of household.
Transaction Privilege Tax (TPT)
TPT is a different animal. It is imposed on vendors for specific business activities, such as retail sales, rather than on personal income.
Arizona generally does not tax professional services, but a service label alone does not decide it. Some activities are taxable and may need an ADOR license, so check your activity before assuming you are exempt.
How to Calculate Arizona Self-Employment Tax
Start with net profit
Take gross business receipts, subtract ordinary and necessary expenses, and you have net profit. Computing tax on gross 1099 payments overstates what you owe. Having no 1099 does not make income tax-free either, because business income is reportable regardless.
Federal SE tax
- Start with net profit from Schedule C.
- Multiply by 92.35% to get the SE tax base.
- Apply 15.3%. Social Security applies only up to the wage base, which is $184,500 for 2026 (up from $176,100 in 2025). Medicare has no cap.
- Add 0.9% Additional Medicare Tax on combined wages and SE income above $200,000 (single) or $250,000 (married filing jointly).
Federal income tax
This is calculated separately. You deduct half of your SE tax on Schedule 1 to reach AGI. Then you subtract the standard deduction, which for 2026 is $16,100 single, $24,150 head of household, or $32,200 joint.
You may also qualify for the qualified business income (QBI) deduction, generally up to 20% of qualified business income, subject to limits. It reduces taxable income, not AGI.
Arizona taxable income
Start with federal AGI. Add or subtract Arizona adjustments, such as the subtraction for U.S. government-obligation interest, then take the Arizona standard or itemized deduction. Arizona itemized deductions can differ from federal ones. Form 140 has no separate Arizona QBI subtraction, so recheck it each year.
Worked example (hypothetical)
Assumptions: single Arizona resident sole proprietor, tax year 2026 federal figures, Arizona 2.5% rate with the 2025 standard deduction of $15,750 (confirm the 2026 amount on Form 140 when you file), no QBI deduction, no credits, no other income. This is an illustration, not a tax quote.
| Item | Amount |
|---|---|
| Gross receipts | $90,000 |
| Business expenses | $20,000 |
| Net profit | $70,000 |
| SE tax ($70,000 × 92.35% × 15.3%) | $9,891 |
| Federal AGI (profit minus half of SE tax) | $65,055 |
| Federal taxable income (after $16,100 deduction) | $48,955 |
| Federal income tax (10% / 12% brackets) | $5,627 |
| Arizona tax (($65,055 − $15,750) × 2.5%) | $1,233 |
| Total tax | $16,751 |
| Cash left after tax | $53,249 |
That is roughly 24% of net profit. Claiming the QBI deduction would lower the federal figure further. Arizona estimates are only required above certain income thresholds, but the federal estimates would apply here, about $4,188 a quarter if paid evenly.
Deductions and Tax-Saving Strategies for Arizona Self-Employed Workers
A deductible expense must be ordinary (common in your field) and necessary (helpful and appropriate). Personal costs, capital equipment, and fines are not Schedule C expenses.
Common deductions
- Business software and supplies
- Professional services such as accounting or legal fees
- Advertising and business insurance
- Business-use share of phone and internet
- Education related to your current work
- Ordinary business travel
Vehicle and home office
The standard mileage rate is 70 cents per mile for 2025 and 72.5 cents for 2026. Commuting is not business mileage. Keep a log showing date, purpose, and miles, and separate business from personal driving.
For a home office, the space must be used regularly and exclusively for business. The simplified method is $5 per square foot, up to 300 square feet. The actual-expense method needs records supporting your business-use percentage.
Health insurance and retirement
Form 7206 determines the self-employed health insurance deduction. It is not available for months you could have joined an employer-subsidized plan.
For 2026, retirement options include:
- SEP IRA: the lesser of $72,000 or 25% of compensation, with a special calculation for owners
- SIMPLE IRA: $17,000 employee deferral, plus age-based catch-ups
- Solo 401(k): $24,500 deferral and $72,000 overall limit, before catch-up
These reduce federal AGI. Since Arizona starts from federal AGI, they generally reduce Arizona taxable income too, though Arizona does not adopt every federal provision automatically.
Arizona-specific options
The Small Business Income (SBI) election is made by individuals, with no new entity required. Full-year residents use Form 140-SBI, and the tax year 2025 rate is 2.5%.
The pass-through entity (PTE) election is different: only entities taxed as partnerships or S corporations can make it, not sole proprietors. Eligibility depends on residency, entity type, and income type.
What to avoid
- Personal expenses labeled as business
- Deductions with no clear business purpose
- Missing receipts or mileage logs
- Capital purchases deducted as ordinary expenses
How to Manage Estimated Tax Payments in Arizona
Who must pay
Federal: You generally owe estimates if you expect to owe at least $1,000 after withholding and credits. You avoid penalties by paying the smaller of 90% of current-year tax or 100% of prior-year tax. Use 110% of prior-year tax if prior-year AGI exceeded $150,000.
Arizona: Estimates are generally required for 2026 when 2025 Arizona gross income exceeded $75,000 (single, married filing separately, or head of household) or $150,000 (married filing jointly). Expected 2026 income must also exceed the same threshold.
Forms, dates, and payment tools
Federal estimates use Form 1040-ES. Arizona uses Form 140ES. Pay each separately. For calendar-year 2026, both are due:
- April 15, 2026
- June 15, 2026
- September 15, 2026
- January 15, 2027
Pay federal estimates through IRS Direct Pay or EFTPS. Arizona individual estimates go through AZTaxes.gov.
Cash-flow habits
- Project annual profit and divide expected tax by four.
- Open a dedicated tax savings account and transfer a set percentage from every payment you receive.
- Update your profit estimate quarterly and adjust payments when income changes.
- Save every payment confirmation with your business records.
How to File and Stay Compliant
Federal filing
Entity type drives which federal forms you file:
- Sole proprietors and single-member LLCs: Form 1040 with Schedule C (profit or loss) and Schedule SE (SE tax); the deductible half of SE tax goes on Schedule 1
- Partnerships: Form 1065, then issue K-1s to partners
- S corporations: Form 1120-S
Arizona filing
Use Form 140 for full-year residents, 140PY for part-year residents, and 140NR for nonresidents. ADOR lists current e-file options and requirements.
Tax year 2025 returns are due April 15, 2026; a valid extension moves filing to October 15, 2026. Confirm later deadlines directly with ADOR and the IRS.
Recordkeeping checklist
- Income statements, invoices, and 1099 forms
- Receipts, plus bank and credit card statements
- Mileage logs
- Asset purchase records
- Retirement contributions and health insurance payments
- Estimated-tax confirmations
Keep supporting documents until the period of limitations expires.
Common mistakes
- Treating gross revenue as profit
- Failing to reconcile 1099 income with your books
- Mixing personal and business finances
- Missing TPT registration when your activity requires it
- Overlooking Arizona-specific deductions
- Assuming an extension also extends the payment deadline
That last one is costly. Form 4868 extends filing time only, and Arizona expects at least 90% of tax paid by the original due date. The federal late-filing penalty is generally 5% of unpaid tax per month, up to 25%.
Getting help
If your business has cross-border operations or complicated books, VJM Global offers accounting, bookkeeping, tax compliance, and advisory support, including Form 1040 preparation for U.S. individual taxpayers.
Frequently Asked Questions
What is employee tax in Arizona?
Employers withhold federal income tax, 7.65% FICA, and Arizona income tax from employee wages. Self-employed individuals pay the combined 15.3% SE tax plus income taxes through estimated payments.
How much is $100,000 salary after taxes in Arizona?
It depends on whether the income is W-2 salary or self-employment profit, plus filing status, deductions, benefits, and other income. Use the IRS Tax Withholding Estimator or a tax professional for an individual estimate.
How do I file my Arizona state income tax?
Most full-year residents file Form 140, which starts with federal AGI. You can file and pay electronically through ADOR. Confirm current instructions and deadlines at azdor.gov.
What is the self-employment tax rate in Arizona?
SE tax is a federal obligation of 15.3% on 92.35% of net earnings, with the Social Security portion capped by the annual wage base. Arizona separately taxes income at a flat 2.5%.
Do I have to pay quarterly estimated taxes in Arizona?
Federally, usually yes if you expect to owe $1,000 or more. Arizona applies separate income thresholds based on prior-year and expected gross income. Check both sets of rules.
