Arizona Tax on Capital Gains

Arizona does not impose a separate or special capital gains tax.

Instead, the state treats capital gains as ordinary income and taxes them under its flat state income tax rate of 2.5%.

While this approach is simpler than states with progressive brackets, Arizona offers an important deduction for certain long-term capital gains that can significantly reduce the amount of state tax owed.

Understanding how Arizona’s rules differ from federal tax law is essential for accurate reporting and tax planning.

Ordinary Income Treatment at a Flat Rate

For Arizona income tax purposes:

• Capital gains are included in your federal adjusted gross income (AGI)
• Federal AGI serves as the starting point for your Arizona tax return
• All capital gains are initially subject to Arizona’s flat 2.5% income tax rate

Because Arizona uses a flat rate, the tax treatment is the same regardless of income level or filing status.

No Initial Distinction Between Short- and Long-Term Gains

Unlike the federal tax system, Arizona does not initially distinguish between:

• Short-term capital gains (assets held one year or less), and
• Long-term capital gains (assets held more than one year)

Both types of gains are first included as ordinary income on the Arizona return before applying any state-specific adjustments or subtractions.

Long-Term Capital Gains Subtraction

Arizona provides a valuable tax benefit for qualifying long-term capital gains.

Key Details:

• Applies to assets held more than one year
• For tax years through 2025, the asset must have been acquired after December 31, 2011
• 25% of the net long-term capital gain may be subtracted from gross income

Tax Impact:

• Only 75% of the gain is taxed at 2.5%
• This results in an effective state tax rate of 1.875% on qualifying long-term gains

This deduction can substantially reduce Arizona tax liability for investors, retirees, and homeowners selling appreciated assets.

Expansion of the Deduction Beginning in Tax Year 2026

Starting with tax year 2026, Arizona will expand the long-term capital gains subtraction:

• The 25% subtraction will apply to all long-term capital gains
• The date the asset was acquired will no longer matter
• This change simplifies compliance and broadens eligibility for the reduced effective tax rate

Federal Capital Gains Taxes Still Apply

Arizona taxes are in addition to federal capital gains taxes, which follow different rules.

At the federal level:

• Short-term gains are taxed as ordinary income at rates from 10% to 37%
• Long-term gains are taxed at preferential rates of 0%, 15%, or 20%, depending on income
• Higher-income taxpayers may also owe the 3.8% Net Investment Income Tax (NIIT)

Taxpayers must account for both state and federal obligations when reporting capital gains.

Why Electronic Filing Is Recommended

Because Arizona’s capital gains rules involve specific subtractions and upcoming law changes, electronic filing (e-filing) is recommended.

E-filing:

• Automatically applies Arizona’s long-term capital gains subtraction
• Reduces calculation and data-entry errors
• Ensures proper coordination between federal and state returns
• Reflects law changes, including the expanded 2026 deduction
• Speeds up processing and refunds

Using approved tax software or a professional e-filing service helps ensure accurate reporting and full use of Arizona’s available tax benefits.