Two Wyoming buildings can share a market value and still carry different tax bills, with the same levy and nothing wrong in either valuation. The difference is the class each one is assessed in.
Most owners never ask which class their property is assessed in. For many buildings that is fine, because the class is plainly right. For some, it is the question on the notice with the most money attached.
This article explains the arithmetic of the two rates, what the gap means in dollars, and the questions to ask. It does not tell you which class your property belongs in. Classification is the assessor’s determination. If you are unsure about yours, ask the assessor’s office and your CPA.
The two rates
According to Teton County’s guide to determining property tax, Wyoming assesses commercial (and agricultural and residential) property at 9.5% of market value and industrial property at 11.5%. Assessed value is the market value multiplied by the assessment rate.
The levy is then applied to assessed value to produce the tax. So, with the same market value and the same levy, the class alone sets how large the taxed base is.
What the gap means in dollars
The rates differ by two percentage points. That sounds small. It is easier to see as a ratio: 11.5 ÷ 9.5 = 1.21, so at the same market value an industrial assessed value is about 21% higher than a commercial one.
In assessed value, the difference is always 2% of market value. The table shows a few illustrative market values.
| Market value | Assessed at 9.5% | Assessed at 11.5% | Difference |
|---|---|---|---|
| $500,000 | $47,500 | $57,500 | $10,000 |
| $1,000,000 | $95,000 | $115,000 | $20,000 |
| $2,000,000 | $190,000 | $230,000 | $40,000 |
| $4,000,000 | $380,000 | $460,000 | $80,000 |
To turn the difference into tax, use the levy from your own bill. Levies are often stated in mills, and a mill is one-thousandth. So each mill of levy on a $20,000 difference in assessed value is $20 of tax a year. We do not quote levies here; the one on your bill is the one that counts.
One building, two rates
Take a hypothetical 28,000 square foot building in Rock Springs with a shop floor and offices. Assume the county’s market value is $1,600,000. The figures are illustrative.
- Assessed as commercial: $1,600,000 × 0.095 = $152,000
- Assessed as industrial: $1,600,000 × 0.115 = $184,000
- Difference: $184,000 − $152,000 = $32,000 of assessed value
- Tax difference: $32 a year for each mill of levy on your bill
Now compare that with a value argument. Suppose the owner believes the market value should be $1,400,000, not $1,600,000. At the commercial rate, a $200,000 lower value reduces assessed value by $200,000 × 0.095 = $19,000.
In this example, the class carries more assessed value ($32,000) than a fairly large disagreement about market value ($19,000). That is the reason to read it. It is not a reason to argue for a class without a basis. The class follows the facts of the property as the assessor determines them, and the honest goal is a class that matches those facts.
Who decides the class
The assessor does. Not the owner, not the tenant, and not Clover State.
We do not publish rules about which buildings fall into which class, and we would be wary of anyone who offers a simple one. The facts that matter, and how they are weighed, are for the assessor’s office to explain. How the class interacts with your wider tax position is for your CPA.
What an owner can do is make sure the assessor’s information is accurate and current, and ask a clear question when something looks unexpected.
When the question is worth asking
None of the situations below means a class is wrong. Each is simply a moment when it is worth asking how the class was set.
- The class on your notice changed from the year before.
- The use of the building changed: a new tenant, or an existing tenant changed what it does there.
- The building mixes uses, such as shop space with offices or a warehouse with a showroom.
- You bought the building recently and do not know what the county’s record says about its use.
- The class is not what you expected when you first read the notice.
If none of these applies and the class looks right, move on to the market value. That is where most owners’ questions belong.
Questions for the assessor
Call or write to the assessor’s office early, and keep notes of the answers. Useful questions:
- What class is my property in this year, and has it changed?
- What information about the building and its use did you rely on?
- Does your record of the building’s use match what happens there today?
- If the use changes, what should I tell you, and when?
- If I disagree with the class, how do I raise it, and what is the deadline?
The last question matters. Ask it directly rather than assuming, and write down the answer.
Questions for your CPA
Your CPA sees the property tax alongside everything else you own and file. Ask them:
- How does the property tax on this building fit into my returns?
- If a tenant’s use of the building changes, does that affect anything beyond the property tax?
- What records should I keep about the building’s use from year to year?
Keep a record of use
When a class question comes up, the owner who can describe the building’s use clearly, year by year, has the easier conversation. A one-page record per building is enough:
- Each tenant, its square feet and what it does in the space
- The date each tenant moved in, and any change in its operations
- A simple floor sketch showing shop, warehouse, office and retail areas
- Dated photos of each area, taken once a year
- Any notes from conversations with the assessor’s office, with the date and the answer
Update it when a tenant changes and when the notice arrives. It costs an hour a year and turns a vague phone call into a specific one.
Why tenants care too
Under a triple net lease, tenants reimburse their share of property tax. A change in class changes every share. If one tenant’s operations change and the class follows, other tenants’ charges can move with it.
That is worth knowing before you sign a lease with a new kind of user, and before a renewal conversation in which taxes come up. Read what each lease says about tax pass-throughs, and take questions about the lease language to your attorney.
Check it when the notice arrives
The time to check the class is the day the notice arrives: on the notice itself, or in the assessor’s record if the notice does not show it. According to Washakie County’s review and appeal page, notices of valuation are mailed on or before the fourth Monday of April, and an owner who wants to contest must file no later than 30 days after the mail date on the notice.
Thirty days is enough time to ask the assessor a question and hear back. It is not much time to wait.
Run both rates yourself
Our Wyoming property tax estimator takes the market value from your notice, the class and the levy from your bill. Run it once at 9.5% and once at 11.5%. The gap between the two results is the dollar size of the class question for your building.
It is an estimate, not a bill, and it does not tell you which class is right. It tells you how much the answer is worth.
Where Clover State helps
Our property tax assessment review tests the county’s market value against the market evidence for your building. Along the way it checks the class the county records against the facts in your documents and lists any questions to raise with the assessor and your CPA. It does not determine your class and does not promise a result.
The review is from $1,200 per property, in seven business days, inside the 30-day window. It is a fixed fee with no contingency, part of our property valuation work, and every fee is on the pricing page.
Check the class first
If your building mixes uses, changed tenants or changed hands, check the class before the value when next April’s notice arrives. Book a free 30-minute scoping call and we will tell you what a property tax assessment review needs from you, what it costs and how to fit it inside the window.
