Arizona Form 309 – Credit for Taxes Paid to Another Country
Last reviewed: 2025-11-16
Use the Arizona Tax Form Calculator Form 309: Credit for Taxes Paid to Another Country as a stand alone tax form calculator to quickly calculate specific amounts for your 2026 Arizona state tax return. Alternatively, you can use one of our Combined Federal and State Tax Estimators to quickly calculate your salary, tax, and take-home pay.
Arizona Form 309 is used by individuals who paid income tax to a foreign country and want to claim a credit against their Arizona income tax. This prevents the same income being taxed twice—once by the foreign country and again by Arizona. The form calculates the allowable credit based on the actual foreign tax paid and the portion of Arizona tax that relates to the foreign-sourced income. Foreign taxes exceeding the limit may be carried forward for up to five years.
This calculator reproduces the full structure of Form 309 so taxpayers can understand the interaction between foreign taxes, Arizona taxable income, and the maximum credit permitted under Arizona law.
How Arizona Form 309 Works
The foreign tax credit is determined through a multi-step process designed to align with Arizona’s rules for cross-border taxation. The form ensures that only the foreign tax relating to income taxed by Arizona can be claimed as a credit. Key components include:
- Foreign country or U.S. possession identification – Taxpayers list the country where tax was paid and the type of foreign income received.
- Foreign tax paid – The credit begins with the total foreign income tax paid during the year (line 4).
- Foreign-source Arizona income – Lines 5–7 determine the portion of total income attributable to the foreign country.
- Limitation calculation – Arizona allows a credit only up to the amount of Arizona tax that can be attributed to foreign-source income. This limitation is computed on line 8.
- Allowable credit – The final credit is the lesser of foreign tax paid or the Arizona limitation (line 11).
- Carryforward – If foreign tax exceeds the permitted limit, the unused portion may be carried forward for up to 5 years and applied to future returns (line 12).
Form 309 does not affect federal foreign tax credits. It applies only to Arizona state income tax, and taxpayers may claim both federal and Arizona foreign tax credits where available.
| Note: This form does not contain computations that can be automated. It is provided here for reference so taxpayers can review the structure and required fields before completing and attaching the official form. You must use the official Arizona DOR form when filing. | ||
| Part 1 — Foreign Income and Taxes Paid | ||
|---|---|---|
| 1 | Country to which tax was paid | |
| 2 | Type of foreign income | |
| 3 | Foreign gross income | |
| 4 | Foreign tax paid (converted to USD) | |
| Part 2 — Arizona Tax Attributable to Foreign Income | ||
| 5 | Arizona taxable income before exemptions | |
| 6 | Arizona taxable income attributable to foreign income | |
| 7 | Arizona tax before credits | |
| 8 | Arizona tax attributable to foreign income (line 7 × (line 6 ÷ line 5)) | |
| Part 3 — Credit Allowed | ||
| 9 | Foreign tax paid (from line 4) | |
| 10 | Arizona tax attributable to foreign income (from line 8) | |
| 11 | Credit allowed for 2024 (smaller of line 9 or line 10) | |
| Part 4 — Carryforward of Excess Credit | ||
| 12 | Excess credit (line 9 − line 10, if > 0) | |
| 13 | Credit carryforward from prior years (up to 5 years) | |
| 14 | Total carryforward available | |
| Part 5 — Total Credit to Form 301 | ||
| 15 | Total credit to claim on Form 301 | |
Understanding the Arizona Foreign Tax Limitation
Arizona restricts the credit to ensure that the state only offsets tax attributable to income that is both earned abroad and taxable by Arizona. The limitation formula compares foreign-source income to total income and then applies that ratio to Arizona tax. This prevents situations where taxpayers could apply foreign taxes paid on non-Arizona-sourced income.
Foreign tax credits most commonly apply to wages earned overseas, foreign consulting income, rental income from foreign property, and foreign investment income where tax was withheld abroad. Taxpayers should retain documentation such as foreign payslips, tax withholding certificates, or foreign tax assessments to support the credit.
Last reviewed: 2025-11-16: If you believe this form requires an update, please contact us.
Additional Arizona International Tax Resources
- Arizona Department of Revenue – Foreign Tax Credit Information
- Arizona Form 301 – Nonrefundable Credits Summary
- Arizona Form 140 – Resident Tax Return
Review Arizona’s foreign tax credit rules each year, as credit limitations and carryforward provisions may change. This calculator provides a clear, line-by-line way to understand your allowable foreign tax credit.
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Frequently Asked Questions
Is Form 301 used for amended returns?
Yes. When amending a return involving credits, Form 301 must be recompleted to reflect corrected amounts, removed credits, or added credits. If the corrected return results in credit recapture, Part III of Form 301 calculates the amount owed. Taxpayers filing amended returns should also include Form 300 and any corrected credit schedules to ensure Arizona can recompute tax liability accurately.
Can taxpayers claim both the Arizona and federal foreign tax credits?
Yes, Arizona residents may claim both, but they must coordinate claims carefully. If a taxpayer takes a foreign tax deduction on their federal return instead of a federal credit, Arizona generally requires them to reverse that deduction before applying the Arizona credit. Likewise, if the foreign tax is refunded after filing, both federal and Arizona returns may require amendments. For step-by-step examples, see the guidance linked on the AZ-309 calculator page.
Can charitable donations increase the standard deduction?
Arizona provides an increased standard deduction adjustment for certain charitable contributions—check the state section.
What documentation must accompany Arizona Form 131?
Arizona typically requires: (1) a copy of the death certificate, (2) Form 131 completed and signed by the claimant, and (3) if applicable, court letters of personal representative appointment. When no personal representative exists, individuals claiming based on funeral or medical expenses must attach receipts or payment confirmations. If the spouse claims the refund, no probate documentation is required, but the spouse must still provide the death certificate. For electronically filed returns where attachments cannot be included, taxpayers must mail the documentation to the Arizona Department of Revenue with a cover note referencing the e-file confirmation. You can refer to the instructions included with the form at the AZ-131 calculator page.
How are refunds and payments handled on Form 140?
Refunds and balances due are determined by comparing total tax after credits with total payments and withholding. Form 140 incorporates Arizona withholding from W-2s and 1099s, estimated tax payments, extension payments, refundable credits, and certain credit transfers. Any excess withholding or refundable credits generate a refund, while an underpayment results in a balance due. Taxpayers may also designate part of their refund to voluntary Arizona funds or apply it to next year’s estimated tax. Instructions for refund allocation and electronic payment methods can be found on the Form 140 filing guide at Arizona Form 140.
Important Notes
All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.