Arizona Quarterly Tax Calculator 2026
Rates reviewed · Arizona Department of Revenue
Arizona moved to a flat 2.5% income tax in 2023 — one of the lowest rates in the US. Estimated payments required if you expect to owe $1,000 or more.
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Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.
Arizona quarterly tax questions
How much is the quarterly tax for freelancers in Arizona?
Freelancers in Arizona pay federal self-employment tax (15.3% of net self-employment income), federal income tax at their bracket, and Arizona income tax of 2.5% flat. This calculator applies 2.5% as a representative Arizona rate for freelancer-level income; the top marginal rate is 2.5% flat.
When are quarterly estimated taxes due in Arizona for 2026?
Arizona follows the federal estimated tax schedule for 2026 — Q1: April 15, 2026, Q2: June 16, 2026, Q3: September 15, 2026, Q4: January 15, 2027. The Q3 payment is due September 15, 2026.
Do I have to make Arizona estimated tax payments?
Arizona requires estimated payments once you expect to owe $1,000 or more in state income tax for the year. The state form is Form 140ES. Payments can be made online through AZTaxes.gov. Filing and paying federal estimated tax does not cover the state amount — they are separate payments.
Where do I pay Arizona estimated taxes online?
Arizona accepts online estimated tax payments through AZTaxes.gov, run by the Arizona Department of Revenue. Federal payments go through IRS Direct Pay or EFTPS separately.
What happens if I underpay estimated taxes in Arizona?
The IRS charges an underpayment penalty based on the amount underpaid and the number of days late. Paying at least 90% of this year's tax or 100% of last year's (110% if your AGI exceeded $150,000) meets the federal safe harbour. Arizona applies its own interest and penalty on late or short state payments.
State payments are administered by the Arizona Department of Revenue via AZTaxes.gov.
Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.