Arizona Quarterly Tax Calculator
Calculate your estimated quarterly tax payments for federal and Arizona state taxes. Designed for self-employed individuals, freelancers, and independent contractors.
AZ State Tax: Flat 2.5%
Quarterly Payment Amount
$6,058
Per quarter (4 remaining)
Annual Tax Breakdown
2026 Payment Schedule
Jan 1 - Mar 31
Due: April 15, 2026
$6,058
Apr 1 - May 31
Due: June 15, 2026
$6,058
Jun 1 - Aug 31
Due: September 15, 2026
$6,058
Sep 1 - Dec 31
Due: January 15, 2027
$6,058
Don't miss your quarterly payments!
The IRS may charge penalties and interest if you underpay or pay late. Consider setting up automatic payments or calendar reminders.
Arizona Quarterly Tax Highlights
Arizona has a flat 2.5% income tax rate
One of the lowest flat tax rates in the country
Use Form 140ES for quarterly estimated payments
Simple tax calculation with single flat rate
Arizona Quarterly Tax FAQ
What is Arizona's income tax rate for self-employed?
Arizona has a flat 2.5% income tax rate for all income levels. This applies to self-employed individuals as well. Combined with federal taxes and self-employment tax, self-employed Arizonans have a relatively low state tax burden.
When are Arizona quarterly taxes due?
Arizona quarterly estimated tax payments are due April 15, June 15, September 15, and January 15. Use Arizona Form 140ES to make your estimated tax payments.
Official References
This calculator uses current federal and Arizona tax rates and schedules:
- IRS Estimated Tax Guidelines
Federal quarterly tax requirements and Form 1040-ES
- Arizona Department of Revenue
Official Arizona tax authority
- Arizona Form 140ES
Arizona estimated tax payment form
- IRS Self-Employment Tax
Social Security and Medicare tax information
This calculator provides estimates based on 2026 tax rates. Your actual tax liability may vary based on deductions, credits, and other factors. Consult a tax professional for personalized advice.