State Guide

How to Appeal Your Property Taxes in Utah (2026 Guide)

Published July 10, 2026

If you own a home in Utah, your county assessor sets a market value — what the county thinks your property would sell for — and that number drives your tax bill. Every year you have a statutory window to challenge it before it's locked in, and in Utah that window closes in mid-September.

The Utah deadline: September 15

Utah's appeal deadline is the later of September 15 or 45 days after your value notice is mailed, set by Utah Code §59-2-1004. You file with your County Board of Equalization — not the assessor's office directly, and not a state agency at the first level.

September 15 is the date most owners plan around, and it's the safe floor: your window is never shorter than that. But if your county mailed your valuation notice late, the 45-day rule can push your deadline past September 15 — so always confirm the exact date printed on your own notice. Miss the County BOE window and you generally forfeit your challenge for the year.

How Utah assesses your home

Utah assesses residential real property at 100% of fair market value — Utah Code §59-2-103. That matters for how you build your case: unlike states that assess at a fixed fraction of market value, there's no ratio to convert, so your assessed value and your home's market value are supposed to be the same number.

There is one Utah-specific wrinkle worth understanding. A primary residence qualifies for a 45% residential exemption, meaning only 55% of the market value is actually taxed. That exemption is real money off your bill — but it is a downstream reduction, not a ratio. Your appeal still contests the full 100% market value the county assigned; win a lower market value and your 55% taxable figure drops right along with it.

Category	Utah
Assessment basis	100% of fair market value (§59-2-103)
Primary residence	45% residential exemption → 55% of value taxed
Appeal deadline	Later of Sept 15 or 45 days after notice (§59-2-1004)
Where you file	County Board of Equalization
Assessment cap	None
Can the board raise your value?	Yes, after notice (§59-2-1004)

There's no assessment cap in Utah limiting how much your value can rise year to year — so a stale or inflated valuation can compound, and an appeal is one of the only direct levers you have.

Building your case

Because Utah assesses at full market value, the winning argument is almost always the same: show the board recent, nearby comparable sales — homes like yours that actually closed, similar in size, age, and condition — that support a lower value than the county assigned. Three or four solid comps with clear adjustments are far harder for a board to wave off than a complaint that the number "feels high." One Utah caution: on your own appeal the County BOE can raise your value after notice (§59-2-1004), and if you escalate to the State Tax Commission the value is heard de novo (§59-2-1006) — so file only when your comps clearly support a lower figure, and bring your strongest, cleanest set.

Filing at the county level

Utah's appeals run through your County Board of Equalization, and the mechanics — which form, where to submit it, and whether your county accepts an online filing — vary across all 29 counties. We're building out county-specific guides with the exact filing office and local notes for each. In the meantime, use PROppeal to pull licensed comparable sales for your address and confirm the filing logistics directly with your county assessor's office.

Get your case built

You don't need to wait on a county-specific guide to get started. PROppeal pulls licensed comparable sales for your address, applies Utah's 100%-of-market rule, and gives you a straight answer on whether your assessment is out of line — before September 15 arrives.

Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.