Wyoming property tax is calculated by multiplying your property’s assessed value, which is a fixed fraction of its fair market value, by the combined mill levy charged by every local taxing district that covers your land. The county assessor sets the market value, state law sets the assessment ratio, and your county, school district, and any special districts set the mill levies that add up to your rate. Several exemptions and a refund program can reduce what you owe, but most of them require you to apply by a specific date.
How Your Tax Bill Is Calculated
Each county assessor reappraises your property every year using recent comparable sales, building quality, and physical characteristics. Wyoming does not tax the full market value. Instead, state law applies an assessment ratio based on how the property is classified:1Justia. Wyoming Code 39-13-103 – Imposition
- Residential and commercial property: 9.5% of fair market value
- Industrial property: 11.5% of fair market value
- Mineral production: 100% of gross product value
A home with a fair market value of $300,000 has an assessed value of $28,500. That assessed value, not the market value, is what the mill levy is applied to.
A mill is one dollar of tax per $1,000 of assessed value. Your total mill levy is the sum of every taxing district that overlaps your property. State law caps how many mills each type of entity can impose:2Justia. Wyoming Code 39-13-104 – Taxation Rate
- State general fund: up to 4 mills
- County government: up to 12 mills
- Cities and towns: up to 8 mills
- School districts: 25 mills for unified districts
- Community college districts: up to 10 mills
- Hospital districts: up to 6 mills
- Special cemetery districts: up to 3 mills
Not every property sits inside every type of district, so combined levies differ noticeably from one address to the next. On the $300,000 home above, a combined 70-mill rate produces an annual tax of $1,995. The same home at a combined 60 mills would owe $1,710. The county assessor can tell you the exact combined rate for your parcel.
The 4% Cap on Annual Residential Increases
Beginning in tax year 2024 for structures and 2025 for the associated land, Wyoming automatically caps the annual increase in assessed value of single-family residential property at 4%. Anything above that is exempted from tax. You do not need to apply; the county assessor applies the cap automatically.3Uinta County, WY. HB0045 – Property Tax Exemption – Residential Structures and Land
The cap does not apply the first year after you buy the home, complete new construction, or add square footage. In those cases, the full assessed value counts for one year, and the 4% limit resumes after that.
Exemptions and Refunds That Lower Your Bill
Wyoming offers four separate programs that reduce what homeowners actually pay. You can combine the veteran’s exemption with a homeowner exemption, but you cannot stack the two homeowner exemptions on each other. Pick whichever saves more.
25% Homeowner Exemption
Starting in tax year 2026, any owner who lives in a single-family home as a primary residence for at least eight months of the year can exempt 25% of the home’s fair market value, including the land. The exemption applies only to the first $1 million of fair market value. File an affidavit with your county assessor between October 1 and March 1. Active-duty military members whose deployment prevents them from meeting the eight-month residency rule may still qualify if the home is their legal domicile.4Wyoming Property Tax Division. Wyoming Residential Affidavit Claim
Long-Term Homeowner Exemption
Homeowners who are at least 65 and have paid Wyoming residential property taxes for 25 or more years can claim a 50% reduction in assessed value on a primary residence occupied at least eight months per year. Apply by the fourth Monday in May, every year. The program took effect January 1, 2025, and is scheduled to sunset July 1, 2027.5Uinta County, WY. HB003 – Property Tax Exemption for Long-Term Homeowners
For most eligible homeowners this will beat the 25% exemption while it lasts, because it halves the assessed value with no $1 million ceiling on fair market value.
Veteran’s Exemption
Honorably discharged veterans of qualifying conflicts, their surviving spouses, and certain disabled veterans may exempt $6,000 of assessed value from the tax on a principal residence. That works out to roughly $175 in annual savings depending on local mill levies. A veteran who does not own a home can apply the exemption to a motor vehicle registration instead, worth about $90.1Justia. Wyoming Code 39-13-103 – Imposition
You must have been a Wyoming resident for at least three consecutive years and hold an honorable discharge (DD-214 or equivalent). File the sworn claim with your county assessor by the fourth Monday in May each year. Veterans awarded the Armed Forces Expeditionary Medal or another authorized service medal from a foreign conflict also qualify, even if their service dates do not fall within the specifically named wars.6Wyoming Department of Revenue. Tax Relief
Property Tax Refund Program
Wyoming refunds a portion of property taxes already paid if your household income and assets fall below set thresholds. You must have lived in Wyoming at least five years and occupied the property as a primary residence for at least nine months of the tax year.7Justia. Wyoming Code 39-13-109 – Taxpayer Remedies
The income ceiling is 145% of the median gross household income for your county or the state, whichever is higher. The refund tier depends on where you fall:
- At or below 125% of median income: 100% of the maximum refund
- Between 126% and 145% of median income: 65% of the maximum refund
The maximum refund itself cannot exceed 75% of the prior year’s property tax or half the median residential tax bill in your county, whichever is less. Total household assets must stay under $169,866 per adult household member, a figure that adjusts annually with the cost of living. Applications are due by the first Monday in June for taxes paid the preceding year.8Wyoming Property Tax Refund System. Wyoming Property Tax Refund System
When to Pay
County treasurers mail tax bills in September. You have two ways to pay:
- Two installments: first half due November 10, second half due May 10 of the following year.
- One lump sum: pay the full amount by December 31 and no interest or penalty accrues on the first installment.
If a due date falls on a weekend or holiday, the deadline rolls to the next business day.9FindLaw. Wyoming Code 39-13-107 – Collection Any balance not paid by its due date is delinquent and accrues interest at 18% per year.10Justia. Wyoming Code 39-13-108 – Enforcement
If you have a mortgage, your servicer likely collects property taxes through an escrow account built into your monthly payment and pays the county treasurer directly. When your assessed value rises, your monthly escrow payment will rise with it.
Challenging Your Assessment
If you think the market value on your assessment notice is too high, you have 30 days from receiving the notice to file a written appeal with the county assessor. The appeal has to go after market value; you cannot challenge the mill levy this way.11Wyoming Department of Revenue. Residential
The county board of equalization hears the appeal. Bring recent comparable sales, an independent appraisal, or documentation of property defects the assessor missed. A general feeling that taxes are too high will not help.
If the county board rules against you, you have 30 days to appeal to the State Board of Equalization. The State Board cannot extend that deadline. Your notice of appeal must include a copy of the county board’s decision, a plain-language statement of the errors you believe occurred, the assessment amount in dispute, and the relief you are requesting.12Wyoming State Board of Equalization. Frequently Asked Questions
What Happens If You Don’t Pay
Unpaid property taxes do not sit quietly. The county treasurer can sell a lien on your property to recover what is owed. Before any sale, notice must be published in a local newspaper once a week for three consecutive weeks, with the first publication at least four weeks before the sale.10Justia. Wyoming Code 39-13-108 – Enforcement
A buyer at the sale pays the delinquent taxes, interest, penalties, and costs, and receives a certificate of purchase. You can redeem the property by paying the county treasurer the full amount of the tax sale plus a 3% penalty, 15% simple interest, and a redemption fee. The certificate holder can apply for a tax deed no earlier than four years after the sale, and the treasurer can issue a deed up to six years from the sale date. After six years, no deed can be issued on that sale.13Campbell County, WY. Tax Sale Info
If You Own Agricultural Land or Business Property
Agricultural land is valued on what it can produce, not on open-market sale value, which usually results in a far lower assessment. To qualify, the parcel cannot be inside a platted subdivision and must be actively used for crops, timber, forage, or livestock. You need at least $500 in annual gross agricultural revenue if you farm it yourself, or $1,000 if you lease it out. Parcels under 35 acres inside a subdivision are generally classified non-agricultural unless the owner proves otherwise. The productive value is then assessed at the same 9.5% rate as residential property.14Goshen County. Agricultural Property
If you own a business, Wyoming also taxes personal property used in that business: equipment, furniture, computers, machinery, tools, and unlicensed vehicles. Inventory held for resale and vehicles with standard plates are exempt. You must self-report by filing a personal property declaration with the county assessor by March 1 each year. If you miss the deadline, the assessor will estimate the value from whatever information is available, and the estimate is unlikely to work in your favor.15Campbell County, WY. Personal Property Valuation