Why 2026 is the year to check your Salt Lake County assessment
Salt Lake County mails its Notice of Property Valuation and Tax Changes by July 22. When yours arrives, look at the market value the county assessor has placed on your home, not just the tax amount.
The county starts accepting appeals on August 1, 2026, and the window closes on September 15, 2026. That means you can act this season, with this year's tax bill still on the line.
The market context matters too. The median single-family sale price in the county was $585,000 in early 2025, up 1.6 percent year over year, and when the assessor values hundreds of thousands of parcels at once, individual homes get missed high as well as low.
If the value on your notice looks higher than what your home would actually sell for, you have roughly six weeks to file. This guide walks through the deadline, the process, and the evidence Salt Lake County expects up front.
When is the deadline to appeal in Salt Lake County?
Utah law sets the appeal deadline as the later of September 15 or 45 days after the county auditor mails your valuation notice. Because Salt Lake County mails notices by July 22, the deadline for most homeowners is September 15, 2026.
The county begins accepting appeals on August 1, 2026, though one county page lists July 31. Either way, plan on the first days of August as your starting line.
If your notice arrives unusually late, the 45 day rule protects you. Count 45 days from the mailing date printed on the notice, and if that lands after September 15, you get the later date.
Use July to get ready. The window is generous, but pulling together comparable sales takes time, and Salt Lake County will not accept an appeal without evidence attached.
How does the Salt Lake County appeal process work?
You appeal to the Salt Lake County Board of Equalization, which is the County Council acting in that role. The Auditor's Tax Administration office runs the process day to day, the appeals line is 385-468-8120, and you can check the status of a filed appeal at apps.saltlakecounty.gov.
- Review the market value on your valuation notice when it arrives in late July.
- File between August 1 and September 15, 2026, using the county's Online Property Tax Appeal portal, by email to propertytaxappeals@slco.org, by mail, or in person at the Clerk of the Board of Equalization, 2001 S State St #N3-300, Salt Lake City.
- Attach your evidence when you file. Tax Administration screens every appeal for sufficient evidence before it moves forward.
- The Assessor's office reviews your evidence and recommends a value. You can accept the recommendation or proceed to a hearing.
- The Clerk of the Board of Equalization mails you a final written decision. The board must decide within 60 days of your application.
- If you disagree with the decision, you have 30 days to appeal to the Utah State Tax Commission using form TC-194, filed with the county auditor.
What evidence do you need to file?
Salt Lake County screens appeals for sufficient evidence at filing, so do not send a bare form that simply says the value is too high. Your documentation goes in with the application.
Comparable sales are the workhorse route for most homeowners. Choose sales that genuinely resemble your home, because the Assessor's staff will check them, and a same-neighborhood sale of similar style and age beats a stretch comparison from across the valley.
The county looks for one of these packages:
- Comparable sales: at least 3, and up to 5 is preferred, of homes similar to yours in style, size, age, and location, sold within 1 year of January 1, 2026.
- A recent appraisal of your property.
- Your own purchase documents, if you bought the home close to the valuation date.
How does the 55 percent primary residence math work?
Utah taxes primary residences on 55 percent of market value. A 45 percent exemption comes off the top automatically, so a home the county values at $473,800 is taxed on about $260,590.
That is why your appeal targets the market value, not the taxable value. Cut the market value by 10 percent, to about $426,420, and the taxable value drops to about $234,530, so the bill falls by about 10 percent too.
Second homes and commercial property are taxed on 100 percent of market value. And check that the exemption actually shows up on your notice: if your primary residence is being taxed on the full value, that is a separate fix worth making alongside any appeal.
Why can your tax go up even when rates go down?
Utah's Truth-in-Taxation law means local governments do not automatically collect more revenue when values rise. The certified tax rate floats down as total values go up, and any increase above that rate requires a public hearing in August.
In the 2025 to 2026 cycle, 59 taxing entities proposed increases, down from 66 the year before, with a median proposed hike of 8.31 percent.
The catch is that this system balances the total, not your share of it. If your home is over-assessed relative to your neighbors, the tax burden shifts onto you even in a year when rates fall. That shifted burden is exactly what an appeal corrects.
How much money is at stake, and is it worth appealing?
The median Salt Lake County home is valued around $473,800, with a median bill of $2,823 at an effective rate of about 0.57 percent. A 10 percent reduction in market value saves roughly $282 per year.
Sale prices run higher than the median assessed value in much of the county, and Cottonwood Heights medians run around $824,350. On a $585,000 home with a bill near $3,485, a 10 percent reduction is worth about $349 per year.
Filing is free, and many appeals resolve at the recommendation stage: the Assessor reviews your evidence, proposes a value, and if you accept, you never attend a hearing. Either way the board must answer within 60 days.
The main cost is the time it takes to pull comparable sales and build the package. If you would rather not do that yourself, Homespring handles the whole appeal, from evidence to hearing, with no upfront fee.