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Wyoming Commercial Property Tax Appeals

Wyoming has some of the lowest commercial property tax rates in the country — guarded by one of the strongest presumptions. The assessor's number is presumed valid, accurate, and correct until credible evidence says otherwise. Bring the evidence.

By Charlie Young, Principal — former Managing Director at one of the nation's largest property tax firms · LinkedIn · Last reviewed July 2026

Appeal Deadline
30 Days from Notice
Commercial Ratio
9.5% of Market
Effective Rate
~0.55–0.70%
Why Wyoming Is Different

Low Rates, Strong Presumption, One Expensive Line

Wyoming assesses annually at fair market value, then applies the gentlest ratios in our footprint: commercial property at 9.5% of market value (industrial at 11.5%, minerals at 100%). With total levies of roughly 57–73 mills, effective commercial rates land around 0.55–0.70% of market value — Jackson near the bottom at about 0.54%, Casper at the top near 0.69%. Among the lowest in the country.

Low rates don't mean easy appeals. Wyoming pairs them with a presumption that the assessor's valuation is "valid, accurate, and correct" — one that survives until overturned by credible evidence, where a mere difference of opinion is not enough. And the venue structure is unforgiving: the State Board of Equalization reviews only the record made below, so the county board hearing is effectively the whole case.

The quiet money is on the classification line. Industrial property pays 11.5% versus commercial's 9.5% — a 21% swing in the bill on identical value — and "industrial" turns on statutory prongs about manufacturing, processing, and transformation that plenty of borderline properties straddle. Wyoming's 2024–2026 reform wave (Amendment A, the homeowner exemptions) was residential-only: commercial rules are unchanged, which means the fundamentals — valuation and classification — are still where the dollars move.

The Appeal Calendar

Every Date That Matters

Wyoming's clock starts in late April and moves fast — and the record you build at the county board is the record every later stage reviews.

Real Propertyland & buildings
  1. January 1
    Assessment date
    All property is listed and valued annually at fair market value as of January 1 (Wyo. Stat. 39-13-103).
  2. 4th Monday of April
    Assessment schedules mailed
    The assessor sends each owner an assessment schedule showing current and prior year market value (Wyo. Stat. 39-13-103(b)(vii)). Read it against last year — Wyoming values move annually.
  3. +30 days
    Written objection to the assessor
    The appeal is a written statement to the county assessor specifying why the assessment is incorrect, due within 30 days of the schedule's mailing or postmark, whichever is later (Wyo. Stat. 39-13-109(b)(i)). Informal review with the assessor often resolves it here.
  4. Summer
    County Board of Equalization
    The county commissioners, sitting as the board of equalization, hold a recorded contested-case hearing with pre-hearing disclosure of witnesses and evidence. This record is the case — build it like the appeal depends on it, because it does.
  5. +30 days
    State Board of Equalization
    Appeal within 30 days of the county decision's entry or mailing, whichever is later. The SBOE sits as an appellate body — it reviews the county record for substantial evidence and legal error and does not re-find facts.
  6. +30 days
    District court
    Judicial review of the SBOE decision within 30 days (Wyo. Stat. 16-3-114; Rule 12, W.R.A.P.), with further appeal to the Wyoming Supreme Court.
Personal Propertyequipment & fixtures
  1. January 1
    Assessment date — 2026 changes the math
    New this year: the first $75,000 of fair market value per county is exempt — up from $2,400 (SF0048) — taking most small businesses off the rolls. Also new: a 20% depreciation floor (SF0049); equipment never values below a fifth of its installed cost, no matter its age.
  2. March 1
    Declaration (ATD-25) due
    The declaration still must be filed — the exemption is applied from it. A written request by February 15 extends filing to April 1. Non-filers get a best-information assessment plus a civil fee of $5 per day capped at $250 (the oft-cited $500-plus-$100-a-day penalty belongs to centrally assessed utility and rail filings, not the county declaration).
  3. April 27
    Assessment schedules mail (fourth Monday of April)
    Real and personal property share the same notice and the same 30-day clock.
  4. +30 days
    Contest to the assessor → county board
    The written statement of objections goes to the assessor within 30 days of the schedule date; the county board must rule by October 1, with further appeal to the State Board of Equalization under its procedural rules.

Statutory basis: Wyo. Stat. 39-13-103 (valuation and notices), 39-13-109(b)(i) (objection), SBOE Rules ch. 3 (state board appeals), 16-3-114 (judicial review). Wyoming is a non-disclosure state: sale prices on statements of consideration (Wyo. Stat. 34-1-142) are confidential — but a taxpayer contesting an assessment may obtain relevant statements in the appeal. Personal property: declarations W.S. 39-13-107(a); exemption W.S. 39-11-105(a)(xlii) ($75,000 for 2026, SF0048); depreciation floor W.S. 39-13-103(b)(ii) (SF0049); civil fee W.S. 18-3-205(b).

How the Bill Is Built

9.5% of Value — Unless It's 11.5%

The formula is simple: market value × the class ratio × mills. A $10 million commercial property in Cheyenne carries $950,000 of assessed value and, at roughly 70 mills, pays about $66,000 a year. The same building classified industrial pays about $80,000 — the classification alone is worth $14,000 a year, every year, on that one property.

The statutory line: industrial means property used or held for manufacturing, milling, converting, producing, processing or fabricating materials; mineral extraction or processing; or the mechanical, chemical or electronic transformation of property into new products. Distribution with light assembly, food production attached to retail, repair operations inside warehouses — the gray zone is wide, and classification is contestable through the same 30-day objection as valuation.

On valuation itself, remember what the presumption demands: credible evidence, not opinion. Comparable data, a qualified appraisal, income analysis, or errors in the assessor's property record card overcome it — and once overcome, the burden shifts to the assessor to defend the number. In a non-disclosure state, the confidential statements of consideration are obtainable in your own appeal: use them.

The Class Ratios
9.5%
Commercial assessed value is 9.5% of market value — industrial 11.5%, minerals 100%. The lowest-rate state in the SVA footprint.
Jackson (2025)57.3 mills · ~0.54%
Cheyenne (2025)~69–71 mills · ~0.66%
Casper (2025)72.9 mills · ~0.69%
Industrial premium11.5% vs 9.5% = +21%
Market 2025 Total Mills Effective Commercial Rate (9.5% × mills)
Jackson (Teton County) 57.3 ≈ 0.54% of market value
Cheyenne (Laramie County) ≈ 69–71 ≈ 0.66%
Casper (Natrona County) 72.9 ≈ 0.69%

Structure: 12 state school foundation mills, county general capped at 12, cities capped at 8, the 25-mill school district levy plus the 6-mill county school fund, and special districts. Jackson levies only 0.5 of its 8-mill city authority — resort-market values carry the budget instead.

Where Appeals Are Won

The Grounds That Actually Move Bills

A strong-presumption state rewards owners who arrive with a case, not a complaint:

Overcoming the presumption

"Valid, accurate, and correct… until overturned by credible evidence" — and opinion doesn't count. Comparable data, a qualified appraisal, or income analysis flips the burden onto the assessor to defend the number.

The classification line

Industrial's 11.5% versus commercial's 9.5% is a 21% bill swing on identical value. The statutory prongs — manufacturing, processing, transformation — leave a wide gray zone worth auditing on every mixed-use industrial-ish asset.

The confidential-sales asymmetry

Sale prices are confidential (Wyo. Stat. 34-1-142) — but a taxpayer contesting an assessment may obtain relevant statements of consideration in the appeal. The data the assessor valued you with is reachable; most owners never ask.

Build the county record

The State Board reviews the county record for substantial evidence — it does not re-find facts. Whatever isn't in the county board record doesn't exist on appeal. The hearing is the case.

The evidence exchange

Wyoming's process includes pre-hearing disclosure of witnesses and exhibits between assessor and taxpayer. Prepared owners see the county's case before the hearing — and force the county to see theirs.

Low rate, large assets

At 0.55–0.70%, the dollars concentrate where values are big: resort-market hospitality, large industrial plants, and anything near the classification line. A low rate on a Teton County number is still real money.

Wyoming FAQ

Common Questions

When is the deadline to appeal property taxes in Wyoming?
Thirty days from the mailing or postmark of your assessment schedule, whichever is later. County assessors send schedules on or before the fourth Monday in April, and the written objection — stating the reasons the assessment is incorrect — is filed with the county assessor. The county board of equalization (the county commissioners) then hears the case; an adverse decision is appealed to the State Board of Equalization within 30 days of the decision's entry or mailing, whichever is later, and from there to district court within 30 days.
How is commercial property assessed in Wyoming?
Annually at fair market value as of January 1, with the assessed value set by class: commercial and most other property at 9.5% of market value, property used for industrial purposes at 11.5%, and mineral production at 100%. Total mill levies typically run about 57–73 mills, producing effective commercial tax rates of roughly 0.55% to 0.70% of market value — among the lowest in the country. Jackson sits near 0.54%, Cheyenne around 0.66%, and Casper about 0.69%.
Who has the burden of proof in a Wyoming appeal?
The owner — and Wyoming's presumption is unusually strong. The assessor's valuation is presumed valid, accurate, and correct, and that presumption survives until overturned by credible evidence; a mere difference of opinion as to value is not enough. Once the owner produces credible evidence — comparable data, an appraisal, income analysis, or errors in the assessor's records — the burden shifts to the assessor to defend the number. Wyoming appeals are won on evidence quality, not indignation.
What is the industrial vs. commercial classification issue in Wyoming?
Industrial property is assessed at 11.5% of market value versus 9.5% for commercial — a 21% difference in the tax bill on the same value. By statute, industrial means property used or held for manufacturing, milling, converting, producing, processing or fabricating materials; mineral extraction or processing; or the mechanical, chemical or electronic transformation of property into new products. Properties near that line — warehouses with light assembly, food operations, shops attached to distribution — are worth a classification review, which runs through the same 30-day objection process as a valuation appeal.
Did Wyoming's recent property tax reforms change commercial taxes?
No. Amendment A (2024) created a separate constitutional class for residential property, and the 2024–2026 legislation — the 25% homeowner exemption, the 4% residential cap, the long-term homeowner exemption — applies only to residential property. Commercial assessment at 9.5%, the late-April notices, and the appeal procedure are all unchanged, and a 2025 bill to cut the residential ratio failed. For commercial owners the practical effect is indirect: as residential relief tightens local budgets, keeping your own valuation and classification tight matters more, not less.
What does a Wyoming property tax appeal cost?
SVA works on pure contingency — no retainers, no minimums, and no fee unless your taxes are reduced. Our rate scales down from 20% to as low as 8% as the property's annual tax liability grows, versus the industry-standard flat 25%. Wyoming's low rates mean the opportunities concentrate in high-value assets — resort-market properties, large industrial plants, and anything straddling the 11.5% classification line — where even a low rate on a big number is real money. See the full fee matrix.

Is your classification costing you 21% extra?

Send us your assessment schedule — we'll screen the valuation against the market and audit the classification line at no cost. In a strong-presumption state, knowing whether you have credible evidence before filing is the whole game.

Request a Free Review See Our Fees

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