@Bryan Morris this is definitely a timely topic. I have successfully challenged multiple tax assessments and will again this year. You need to go in with statistics and facts, not emotions. Keep in mind that the current assessment is for the value on January 1, 2021 not 2022. In a raising market, that helps since homes were cheaper in 2021.
As much as I despise the "Z" company that does online estimates, they used to take Ada County tax assessment and multiply by 1.4 to come up with their valuation. Idaho is a non-disclosure state, so they had to figure out alternate ways to calculate their values. If you download their spreadsheet from their own website, they show how inaccurate they are on unlisted properties in Idaho! However, when a property is listed, they adjust their values from the MLS and amazingly their accuracy jumps from only 44% of homes sold were within 5% of their estimate to over doubled the accuracy to 82.6%. https://www.zillow.com/z/zesti...
Idaho's property taxes are based on a levy code not a rate based system. The difference being that our levy codes change to reflect (Budget / total property values) x property value (adjusted for homeowners (homestead) exemption = Property Tax. Just because your property values increases, doesn't mean your taxes will go up the same percentage!
I used to tell people that Ada County Tax Assessor appeared to purposely assess below the market but raised the levy code to make up for it. For example, If a home was worth $100,000 and their levy code was 1% to generate $1,000 in revenue; it appeared they would assess it for $90,000 and raise their levy code to 1.1111% they would still receive $999.90 in taxes but have a lot fewer phone calls and challenges to their assessments.
A few suggestions: pull comps from January 2021; adjust for condition (if your tenant trashed the place or let the yard go, needs TLC, etc. point that out); adjust for location (is your home on the non-view side of the street or backing to the busy street or under the power lines; etc. Do not just go on price per square foot unless all your comps are similar in size and quality.
Best of luck on your appeal.