How Arizona Property Taxes Are Assessed and How a Lender Escrows for Them

Arizona property taxes are assessed by the county assessor, not by the lender or the state. The assessor establishes a full cash value and a limited property value for your parcel, an assessment ratio is applied based on how the property is classified (owner-occupied residential is treated differently from rental or commercial), and the resulting assessed value is multiplied by the combined tax rates of every taxing jurisdiction that covers your address.

Those jurisdictions stack. County, city or town, school district, community college district, fire district, and any special assessment districts each contribute a piece of the rate. Two homes of identical value on opposite sides of a district boundary can carry meaningfully different annual tax bills for that reason alone.

Arizona also assesses on a lag. Valuations are set well ahead of the tax year they apply to, and notices of value arrive months before the bill does. That gap is why a homeowner can receive a valuation notice in one calendar year and not see it reflected in an actual bill until the next.

Arizona counties bill property taxes for a single tax year in two halves. The first half covers January through June and becomes due in the fall, and the second half covers July through December and becomes due the following spring. Each half has its own delinquency date, and each can go delinquent independently of the other.

This is the part that trips people up. The tax year and the billing calendar do not sit on top of each other, so at any given moment you may owe a bill for a period that has already passed. A homeowner reading a statement in, say, February is looking at a second instalment that will not be delinquent for months, covering a period from the prior calendar year.

Counties do generally permit paying the full year at once if you prefer, and many homeowners without an escrow account do exactly that. When there is a mortgage with escrow, the lender or its servicer handles the timing instead.

An escrow account (sometimes called an impound account) is a holding account the servicer maintains on your behalf. A portion of what you send each month is set aside there, and when a tax instalment comes due the servicer pays the county directly out of that balance. The lender is not earning on the money, it is managing timing so a large periodic bill does not land on you all at once and so the lien securing the loan stays clear of delinquent taxes.

The servicer works from an annual escrow analysis. It projects the coming year's tax instalments and hazard insurance premiums, divides the total across the year's collections, and adds a cushion that federal rules cap at a limited number of months of disbursements. That cushion exists because taxes and premiums rise, and a bill can come due before the collections meant to cover it have accumulated.

Because the instalments are lumpy and the collections are level, the balance in an escrow account is supposed to rise and then drop sharply. Seeing your balance fall right after a tax disbursement is the account working correctly, not a shortage.

On a refinance, the old loan's escrow account and the new loan's escrow account are separate things. The new lender establishes a fresh account and collects enough at closing to make sure the next instalment can be paid on time, and the prior servicer refunds whatever was sitting in the old account, usually by mail within a few weeks of payoff.

Where the timing matters is proximity to a delinquency date. Closing shortly before an instalment comes due generally means more months of taxes collected at closing, because the new account has almost no runway before it has to pay the county. Closing further out from a due date usually means less. Either way, the money is not a fee, it is your money placed in your account, and the refund from the old escrow typically offsets much of it.

One more wrinkle worth knowing: if an instalment is already paid or about to be paid at the time of closing, that gets sorted out in the payoff and prorations so the county does not get paid twice and nothing gets missed. Confirming who is paying which instalment is a fair question to ask out loud before you sign.

After each annual analysis, the servicer either finds the account on track, short, or holding a surplus. A shortage usually traces to a tax increase or an insurance premium increase that outran the collection amount set a year earlier. You are typically given the choice of paying the shortage in a lump sum or having it spread across the coming year's collections.

A surplus above a threshold set by federal rule gets refunded to you, and the collection amount is recalculated downward. This is also why the escrow portion of what you send can change even when your interest rate has not moved at all. The loan terms are fixed, the tax and insurance bills behind the escrow are not.

If you believe your county valuation is wrong, Arizona has an appeal process with real deadlines tied to the notice of value, and it runs through the assessor and the county, entirely separate from your lender. A successful appeal shows up in your escrow only after the county revises the bill and the next analysis picks it up.