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Updated 2025 Tax Year

Big Horn County
Property Tax Guide

Everything you need to know about property taxes in Big Horn County, WY. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
Quick Facts
Tax Rate
Typically around 1% effective rate, varies significantly by special taxing districts within county
Exemptions
3+ Available
Section 1

How Property Tax Works

Big Horn County, Wyoming operates under a property tax system that serves as the primary funding mechanism for essential local services including schools, county government operations, fire protection, and various special districts. Property taxes in Big Horn County are assessed based on fair market value, with Wyoming's standard assessment ratio applied to determine taxable value. The effective tax rate in Big Horn County typically ranges around 1%, though this varies significantly based on your specific location within the county due to different combinations of special taxing districts.

The actual tax rate you pay depends on where your property is located within Big Horn County, as different areas fall under various special taxing districts such as school districts, fire districts, library districts, and other municipal services. These overlapping jurisdictions each levy their own rates, which combine to create your total property tax bill. Big Horn County has shown tax collection growth in recent years, with total collections increasing from approximately $10.9 million in earlier years to over $12.3 million more recently, reflecting both property value appreciation and community growth.

Section 2

What Makes Up Your Tax Bill

ComponentEstimated RateDescription
County General0.003-0.005Basic county services, administration, roads
School District0.004-0.008Local school funding, varies by district
Fire District0.001-0.002Fire protection services (where applicable)
Library District0.0005-0.001Library services (select areas)
Special Assessments0.001-0.003Various improvement districts, bonds
Total Estimated Range0.009-0.019Varies significantly by location

Note: These rates apply to the current levy year and are estimates based on available data. Actual rates vary considerably depending on your property's location within Big Horn County and which special taxing districts serve your area. Contact the Big Horn County Assessor's Office for precise rates applicable to your specific property location.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Big Horn County, property taxes are due in two installments:

Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in Big Horn County are additional property tax assessments that occur when there are changes to your property during the tax year that affect its assessed value. The most common triggers include ownership transfers (such as home sales), new construction or major improvements, and changes in property use or classification. When these events occur, the county assessor recalculates the property's assessed value and issues a supplemental tax bill for the difference.

The supplemental tax is calculated by determining the difference between the old and new assessed values, then applying the current tax rate to that difference, prorated for the remaining months in the tax year. For example, if you complete a $50,000 home addition in March and your area's tax rate is 1.2%, you would owe approximately $600 in additional taxes ($50,000 × 1.2%), prorated for the 10 months remaining in the tax year, resulting in a supplemental bill of about $500. Supplemental tax bills are typically issued within a few months of the triggering event and have separate due dates from your regular property tax payments.

Example Calculation

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value: $300,000 (100% of market value in WY)
  • Tax Credits Applied: $0 (no credits claimed)
  • Net Taxable Value: $300,000
  • Tax Rate: 1.1% (varies by location)
  • Annual Tax: $3,300
  • Monthly Escrow: $275

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value: $600,000
  • Tax Credits Applied: $1,500 (25% homestead credit on $150,000 structure value - requires application)
  • Net Taxable Value: $598,500
  • Tax Rate: 1.1% (varies by location)
  • Annual Tax: $6,584
  • Monthly Escrow: $549

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value: $1,000,000
  • Tax Credits Applied: $2,500 (25% homestead credit capped - requires application)
  • Net Taxable Value: $997,500
  • Tax Rate: 1.2% (varies by location)
  • Annual Tax: $11,970
  • Monthly Escrow: $998

Note: Tax credits shown require annual application and approval. Rates vary significantly by location within Big Horn County.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Big Horn County require borrowers to maintain an escrow account for property tax payments, especially when the loan-to-value ratio exceeds 80%. Your lender collects monthly escrow payments as part of your mortgage payment, typically calculated by dividing your annual property tax bill by 12, plus a small cushion to account for potential increases. The lender holds these funds in a separate escrow account and makes property tax payments directly to Big Horn County when taxes are due.

Property tax payments in Big Horn County are typically due in September, and your lender will ensure payment is made by the deadline to avoid penalties and potential tax lien issues. You should receive an annual escrow analysis from your lender showing the account activity and any adjustments needed for the coming year. If your property taxes increase due to reassessment or rate changes, your monthly escrow payment may increase accordingly. You can verify that your lender has made proper payment by checking with the Big Horn County Treasurer's office or through their online payment portal.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are property taxes due in Big Horn County for the current fiscal year? A: Property taxes are typically due in September in Big Horn County. The exact deadline may vary slightly each year, so check with the Big Horn County Treasurer's office or their website for the specific 2026 due date.

Q: What tax credits are available and do I need to apply? A: The primary credit available is the homestead credit, which provides a 25% credit on the value of qualifying single-family residential structures. Beginning in tax year 2026, homeowners who occupy their property full-time may be eligible. This credit requires annual application and is NOT automatic - you must file with the county assessor's office.

Q: How does the homestead credit work? A: The homestead credit doesn't reduce your home's market value. Instead, it provides a 25% credit on the assessed value of your residential structure and associated improved land. This credit helps limit your tax burden but requires you to file an application and meet residency requirements.

Q: When is the application deadline for homestead and other credits? A: Based on available information, assessor staff provides in-person help with property tax credit applications through May 2026. Contact the Big Horn County Assessor's office for specific application deadlines and requirements.

Q: How often are properties reassessed in Big Horn County? A: Wyoming law requires periodic reassessment of all property. Contact the Big Horn County Assessor's office for the specific reassessment schedule and information about appealing assessments if you believe your property value is incorrect.

Q: What are the penalties for late property tax payments? A: Late payments typically incur interest and penalty charges. These fees compound over time and can eventually lead to tax lien procedures. Contact the Big Horn County Treasurer's office for specific penalty rates and procedures.

Q: Can I pay my property taxes online? A: Many Wyoming counties offer online payment options. Check the Big Horn County Treasurer's website or call their office to confirm available payment methods including online, phone, and mail options.

Q: Why do property tax rates vary within Big Horn County? A: Your total tax rate depends on which special taxing districts serve your property location. These may include different school districts, fire districts, library districts, and special improvement districts, each with their own levy rates.

Q: What if I disagree with my property assessment? A: You have the right to appeal your property assessment. Contact the Big Horn County Assessor's office for information about the appeal process, deadlines, and required documentation to challenge your property's assessed value.

Q: How do special district taxes work? A: Special districts provide specific services like fire protection, libraries, or infrastructure improvements. If your property benefits from these services, you pay additional taxes to fund them. These rates are added to your base county and school district taxes to create your total tax bill.

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