If you overpaid property taxes in Maricopa County, you can get the money back by filing with the right office: the Maricopa County Assessor handles corrections tied to assessment errors or successful valuation appeals, and the Maricopa County Treasurer handles duplicate payments and actually cuts the refund check once a correction reaches the tax roll.1Maricopa County Assessor’s Office. Frequently Asked Questions – Property Tax Which path you take depends on why you overpaid, and the forms, deadlines, and waiting times are different for each.
Figure Out Why You Overpaid
Three situations cover almost every refund.
The first is a factual error on your assessment. Arizona defines these narrowly: the mistake has to be objectively verifiable without anyone’s judgment or opinion, like a wrong square footage figure, a clerical typo in the data used to set your value, or a failure to account for improvements that were demolished.2Arizona Legislature. Arizona Revised Statutes 42-16251 – Definitions Disagreeing with the Assessor’s opinion of market value is not a factual error. That’s an appeal.
The second is a successful valuation appeal. If you challenged your value through the Assessor’s petition process, the State Board of Equalization, or the Arizona Tax Court and won a lower number, taxes you already paid at the higher value become an overpayment the judgment covers.3Arizona Legislature. Arizona Revised Statutes 42-16213 – Findings and Judgment
The third is a duplicate payment, which most often happens when a homeowner pays an installment that the mortgage company’s escrow service also pays. With bills going out in September and installments due October 1 and March 1, double-pays are common.
Assessment Errors: File a Notice of Claim
For a factual error, the paperwork goes to the Assessor, not the Treasurer. The form is called a Notice of Claim and is available on the Assessor’s website and through the Arizona Department of Revenue.4Maricopa County Assessor’s Office. Appeals
Bring evidence. The Assessor expects documentation such as blueprints, building permits, ownership records, or proof of legal classification, and the statutory standard is “clear and convincing,” which is a higher bar than most people expect from an administrative correction.4Maricopa County Assessor’s Office. Appeals2Arizona Legislature. Arizona Revised Statutes 42-16251 – Definitions A bare assertion that the number looks wrong won’t carry the claim. Include your parcel number, the specific tax year you’re contesting, and your contact information.
What Happens Next and How Long It Takes
Arizona law gives the Assessor 60 days to respond with either a decision or a letter scheduling a meeting.5Maricopa County Assessor’s Office. Frequently Asked Questions – Appeals If the Assessor agrees, the correction goes to the Treasurer as a resolution request, and the Treasurer runs its own review before releasing the money. Expect several additional weeks beyond the 60 days before the refund actually lands.6Maricopa County Assessor’s Office. Frequently Asked Questions – Corrections
How Far Back You Can Go
A Notice of Claim covers the current tax year plus the three immediately preceding years.7Arizona State Board of Equalization. How to File a Notice of Claim If you discover in 2026 that your square footage has been wrong since 2020, you can only recover back to the 2023 tax year. The earlier years are gone. Reviewing your Notice of Value when it arrives each year, typically before March 1, is the simplest way to catch problems while they’re still inside the four-year window.
Refunds After a Valuation Appeal
If the overpayment comes from a valuation dispute, the refund rides on the appeal itself. Appeals start with a petition to the Assessor and can escalate to the State Board of Equalization (which hears cases from counties with populations over 500,000, including Maricopa) or the Arizona Tax Court.8Arizona State Board of Equalization. Home If you win a lower value, the judgment covers the excess taxes you paid.3Arizona Legislature. Arizona Revised Statutes 42-16213 – Findings and Judgment
Keep paying while the appeal is pending. Arizona law requires taxes on the appealed property to be paid before they become delinquent, and failing to do so can get your appeal dismissed.9Arizona Legislature. Arizona Revised Statutes 42-16210 – Payment of Tax The deadline to file with the Board of Equalization is also tight: generally 25 days from the date on the Assessor’s notice.8Arizona State Board of Equalization. Home Miss it and you’re waiting for the next cycle.
Duplicate Payments
Duplicate payments are the simplest case because nothing about the valuation is in dispute. Contact the Treasurer’s office with your parcel number and proof that both payments were made. The office is at 301 W. Jefferson Street, Suite 100, Phoenix, AZ 85003, or by phone at (602) 506-8511.10Maricopa County. Staff Directory – Treasurer’s Office The Treasurer’s website also accepts refund requests directly.
One wrinkle: if your lender made the duplicate payment from your escrow account, the refund may need to go back to the lender rather than to you. Coordinate with your mortgage servicer before you file so you don’t trigger a second round of confusion.
How the Treasurer Pays You
Every refund, no matter what triggered it, flows through the Treasurer once a change hits the tax roll. Arizona law requires the Treasurer to refund overpaid taxes caused by a tax roll change. If current-year funds are available, the refund comes from there. If not, the Board of Supervisors must budget for it in the next fiscal year.11Arizona Legislature. Arizona Revised Statutes 42-18061 – Refund
You can track where things stand by searching your parcel number on the Treasurer’s website.12Maricopa County, AZ. Property Tax Bill The transaction history for the parcel shows when a credit balance posts and when a refund is processed.
Don’t Wait Too Long
An authorized refund that stays unpaid and unclaimed for two years after the fiscal year in which it was budgeted reverts to the political subdivision that originally levied the tax.11Arizona Legislature. Arizona Revised Statutes 42-18061 – Refund Once that happens, your window to collect is effectively closed.
If you’ve sold the property, the refund still belongs to whoever actually made the overpayment, but notices tend to go to the property address. Updating your contact information with the Treasurer after a sale is worth the few minutes it takes.