The Utah property tax appeal deadline: a September 15 checklist
The deadline is September 15. The work that wins the appeal has to start weeks before that — and most people who miss out didn't miss the deadline, they missed the lead time. Here's the whole thing counted backward from the date that matters.
Most homeowners who lose a property tax appeal didn't lose at the hearing. They lost in late August, when they decided there was still plenty of time.
There isn't. The appeal is due September 15, but the evidence that wins it — a signed appraisal anchored to the January 1 lien date — takes a week to schedule and a week to produce. Start on September 10 and you don't have an appeal. You have a deadline you're about to miss.
So here is the whole process, counted backward from the date that controls everything.
The deadline: September 15 (with one wrinkle)
Under Utah Code §59-2-1004, a property tax appeal must be filed with your county Board of Equalization on or before September 15, or 45 days after the valuation notice was mailed — whichever is later. Because the notice goes out in late July, the two dates usually land close together, and September 15 controls for most homeowners. If the 15th falls on a weekend or holiday, the deadline rolls to the next business day.
Treat it as firm. Utah has narrow late-filing provisions for clear factual errors — a wrong square-footage figure, a building that no longer exists — but those are corrections, not a value-appeal backdoor, and they vary by county. Do not build a plan around an exception. If your value is wrong, file by the 15th.
Counting backward: the four-week timeline
Work the calendar from September 15, not toward it.
- By August 18 — decide and commission. About four weeks out, make the go/no-go call and, if you're appealing on a signed valuation, commission the appraisal. This is the date that actually matters. Everything downstream depends on it.
- August 18–25 — inspection. The appraiser inspects the property, documents condition, and pulls the comparable sales that existed around the January 1 lien date. One to two hours on site.
- August 25 – September 5 — report production. The retrospective analysis, adjustment grid, and signed report. Standard turnaround is 5–7 business days; building in slack before the deadline is the whole point of starting in mid-August.
- September 5–12 — assemble and file. Attach the report to your county's appeal form, double-check the parcel number and the residential exemption, and file. Filing online takes minutes once the evidence is ready.
- September 15 — deadline. If you followed the timeline, this date is uneventful. That's the goal.
Start later than mid-August and you compress every step into a window with no margin for a scheduling conflict, a rush fee, or a second look at the comparables. The deadline doesn't move. The lead time is the only variable you control.
Three evidence options, ranked by what the BOE values
The Board of Equalization is deciding one question: was the assessor's value higher than fair market value on January 1? Your evidence has to answer that question on that date. Three ways to do it, strongest first.
- A signed USPAP appraisal, effective January 1. A state-certified appraiser's retrospective report with three to five closed comparable sales, an adjustment grid, condition photos, and a signed certification. This is the evidence type hearing officers trust most, because it's the same standard the assessor is theoretically held to — and it's prepared by a licensed third party with no stake in the outcome. See the tax appeal appraisal service page for the lien-date methodology and fees.
- A recent arm's-length purchase of your own home. If you bought the property near the lien date in an open-market transaction for less than the assessor's value, the closing documents are strong evidence on their own. Sometimes this alone carries the appeal; sometimes a corroborating appraisal strengthens it.
- Self-assembled comparable sales. You can pull closed sales of similar nearby homes that sold near January 1 and present them yourself. This is legitimate and free, and it works for clear-cut cases. It's weaker than a signed appraisal because there's no adjustment grid reconciling the differences between the comps and your home — and the assessor's representative will point that out.
A Zestimate printout or an agent's CMA sits below all three. Hearing officers see hundreds of them and discount them heavily. If the gap is large enough to bother appealing, it's large enough to support real evidence.
Filing mechanics, county by county
The statutory process is uniform, but each county runs its own filing system. File with the Board of Equalization in the county where the property sits:
- Salt Lake County — online appeal filing through the County Assessor / Auditor portal; highest appeal volume in the state.
- Utah County — online portal; the fast-appreciation Lehi–Saratoga Springs corridor produces the most over-assessments.
- Davis County, Weber County — county Auditor portals; Bountiful-through-Ogden corridor.
- Summit County, Wasatch County — Park City and Heber resort markets, where the value stakes per appeal are highest.
- Tooele County, Morgan County — smaller offices; confirm the filing method directly with the County Auditor.
Every county publishes its own form (often a "BE" appeal form) and its own submission instructions. Pull yours the day you decide to appeal — not the week of the deadline. The Utah State Tax Commission's Publication 31 covers the appeals process at the state level if you want the official reference.
The deadline is the easy part. The lead time is where appeals are actually won.
Frequently asked
Related reading
Before you commit to the timeline, run the savings math: how much a Utah BOE appeal actually saves gives the per-$1,000 rule of thumb and two worked examples so you know whether filing is worth it. Start with the notice that triggers the deadline: reading your Utah property valuation notice, line by line across all eight counties. For the full hearing process and what a winning case looks like, see the Utah property tax appeal guide. When the evidence you need is a signed valuation, the tax appeal appraisal service page covers the January 1 lien-date methodology, fees, and turnaround. County notes: Salt Lake, Utah, Davis, and Weber counties.
Circle September 15. Then circle August 18, because that's the one that actually decides whether you make it.
Miner Appraisals is an independent, non-AMC residential appraisal practice in Utah — owner-operated by Dan Miner, Utah Certified Residential Appraiser (Lic. 10948175-CR00). Direct engagement only, signed reports, USPAP-compliant. Property tax appeal, estate, divorce, and the rest of the full service catalog. Practicing since 2017.
