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//// Tax · Arizona

Arizona 1099 Quarterly Tax

SE income → SE tax + federal + AZ 2.5% flat tax → quarterly estimated payment.

Where this fits

🧾 TaxTax StackGoing 1099Freelancers

This tool lives inside Tax Stack + Going 1099 and is most useful for freelancers.

401(k) Limit 2024$23,000
Roth IRA Limit$7,000
S&P 500 Avg Return~10%/yr

Income

Quarterly payment
$4,511
estimated
Annual tax
$18,043
SE + federal + state
Safe harbor
$3,000
prior year ÷ 4
Effective rate
25.1%
of net SE income

Tax breakdown

Self-employment tax$10,173
Federal income tax$6,562
Arizona state tax$1,308
Total annual$18,043
Per quarter$4,511
Per month (set aside)$1,504
1

Net self-employment income

netSE = gross − expenses

= $90,000 − $18,000

= $72,000

2

Self-employment tax (Schedule SE)

SE base = netSE × 92.35%; SE tax = base × 15.3%

= $10,173

SE tax = Social Security (12.4%) + Medicare (2.9%)

3

Adjusted gross income

AGI = netSE − (SE tax × 50%)

= $72,000 − $5,087

= $66,913

The 50% SE deduction compensates for the employer half of FICA

4

Federal income tax

federal = brackets(AGI − standard deduction)

= brackets($66,913 − $14,600)

= $6,562

Taxable income: $52,313 · Standard deduction: $14,600

5

Arizona state tax

= $1,308

Arizona enacted a 2.5% flat income tax effective 2023.

6

Quarterly payment

quarterly = totalAnnualTax ÷ 4

= $18,043 ÷ 4

= $4,511

IRS Form 1040-ES due: April 15, June 15, September 15, January 15

Key insight

Arizona enacted a 2.5% flat income tax effective 2023. Pay quarterly by: April 15 (Q1), June 15 (Q2), September 15 (Q3), January 15 (Q4). Underpaying triggers a penalty (~8% annualized on the shortfall). When in doubt, pay the safe harbor amount.

Use this result in →

📅Quarterly Tax Calculator💸Self-Employment Tax

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