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Updated 2025 Tax Year

Custer County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Varies by location - approximately 1% base rate plus school district, municipal, and special district assessments
Exemptions
5+ Available
Section 1

How Property Tax Works

Custer County, South Dakota operates on a property tax system that funds essential local services including schools, roads, law enforcement, and county operations. Property taxes are calculated based on assessed value multiplied by the total tax rate, which includes the county levy plus additional assessments from school districts, municipalities, and special taxing districts within your specific area.

The effective property tax rate in Custer County varies by location within the county due to different combinations of special taxing districts, school districts, and municipal boundaries. South Dakota assesses property at true and full value (100% of market value), with the state's base assessment rate around 1%. The 2025 property tax rates for Custer County are determined annually by the county board of equalization, and specific rates for the current levy year should be verified with the South Dakota Department of Revenue as they become available.

Tax bills are divided into two installments, creating a manageable payment schedule for property owners while ensuring steady revenue flow for local government services throughout the fiscal year.

Section 2

What Makes Up Your Tax Bill

ComponentRateDescription
County General FundTBD*Basic county services, administration, roads
School District LevyVaries by districtK-12 education funding (varies by school district)
MunicipalityVaries by cityCity services (if within city limits)
Special DistrictsVariesFire districts, library districts, etc.
Total Effective Rate~1.0-1.5%Combined rate varies by location

*The 2025 property tax rates for Custer County will be determined by the county board of equalization. Rates apply to the 2025 levy year and vary significantly based on your property's location within specific school districts, municipalities, and special taxing districts. Contact the Custer County Assessor or check the South Dakota Department of Revenue for current rates applicable to your specific address.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Custer 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 Custer County are additional property tax assessments that occur when property changes ownership, undergoes new construction, or experiences significant improvements during the tax year. These taxes are calculated on the difference between the old and new assessed values, prorated for the remaining months in the tax year.

Supplemental taxes are triggered by events such as purchasing a home, completing major renovations, adding structures, or removing exemptions. For example, if you purchase a $400,000 home in July that was previously assessed at $300,000, you would receive a supplemental tax bill for the $100,000 increase in assessed value, calculated from July through the end of the tax year. The supplemental amount would be approximately $500-750 (depending on your tax rate) prorated for 6 months, or roughly $250-375 additional tax due within 30 days of the supplemental bill date.

Example Calculation

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value: $300,000 (100% assessment)
  • Homestead Credit Applied: -$4,000* (requires application)
  • Net Taxable Value: $296,000
  • Tax Rate: 1.2% (example rate)
  • Annual Tax: $3,552
  • Monthly Escrow: $296

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value: $600,000
  • Homestead Credit Applied: -$4,000* (requires application)
  • Net Taxable Value: $596,000
  • Tax Rate: 1.2% (example rate)
  • Annual Tax: $7,152
  • Monthly Escrow: $596

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value: $1,000,000
  • Homestead Credit Applied: -$4,000* (requires application)
  • Net Taxable Value: $996,000
  • Tax Rate: 1.2% (example rate)
  • Annual Tax: $11,952
  • Monthly Escrow: $996

*Tax credits shown are estimates and require annual application. Actual credit amounts and eligibility should be verified with the Custer County Assessor's office.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Custer County require property tax escrow accounts for borrowers with less than 20% down payment. Your lender collects 1/12th of your annual property tax bill with each monthly mortgage payment, holding these funds in a separate escrow account to pay your tax bills when due.

Property taxes in Custer County are paid in two installments: the first installment is due by April 15th, and the second installment is due by October 15th. Your lender will pay these bills directly from your escrow account on your behalf. Lenders typically conduct annual escrow analyses to ensure adequate funds are collected, which may result in payment adjustments if your tax bill increases or decreases.

If you pay your mortgage off or have sufficient equity to waive escrow requirements, you become responsible for making tax payments directly to the Custer County Treasurer's office by the established due dates to avoid penalties and interest charges.

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 Custer County for 2025? A: Property taxes are due in two installments: first installment by April 15, 2025, and second installment by October 15, 2025. Payment must be received by 5:00 PM on the due date to avoid penalties.

Q: What tax credits are available and do they require application? A: The primary tax credit is the Homestead Exemption under SDCL 43-31-33, which requires annual application using form PT 38C. This credit is NOT automatic and must be filed with the County Assessor. Additional credits may be available for seniors, disabled veterans, and low-income households - all requiring separate applications.

Q: How does the Homestead credit work? A: The Homestead credit limits annual assessment increases rather than reducing market value directly. It caps the growth in taxable value, and applications must be filed annually by the deadline. This is a tax credit that reduces your final tax bill, not an exemption that reduces assessed value.

Q: What is the deadline to apply for tax credits? A: Applications for most tax credits, including the Homestead Exemption, must be filed annually. Contact the Custer County Assessor's office for specific deadline dates as they can vary by program.

Q: How often are properties reassessed in Custer County? A: South Dakota requires counties to conduct regular reassessments to maintain assessments at true and full value. Contact the Custer County Assessor for the current reassessment schedule and appeal deadlines if you disagree with your assessment.

Q: What are the penalties for late tax payments? A: Late payments incur penalties and interest charges. Contact the Custer County Treasurer's office for current penalty rates and payment options if you've missed a due date.

Q: Can I pay my property taxes online? A: Many South Dakota counties offer online payment options. Check the Custer County Treasurer's website or contact their office directly for available electronic payment methods and any associated fees.

Q: Why did I receive a supplemental tax bill? A: Supplemental taxes are issued when property changes ownership, new construction is completed, or improvements are made during the tax year. The bill covers the tax difference for the remaining months of the current tax year.

Q: How do special districts affect my tax rate? A: Your total tax rate includes levies from all applicable districts - county, school district, municipality (if applicable), fire districts, and other special districts. Rates vary significantly based on your property's specific location within these district boundaries.

Q: Where can I get help with property tax questions? A: Contact the Custer County Assessor's office for assessment and exemption questions, or the Custer County Treasurer's office for payment and billing questions. The South Dakota Department of Revenue also provides statewide property tax information and resources.

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