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Updated 2025 Tax Year

Siskiyou County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
1.00% to 1.25% of assessed value (1% base rate plus voter-approved assessments, varies by district)
1st Due
Nov 1
2nd Due
Feb 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Siskiyou County property taxes are the primary source of funding for essential local services including schools, fire protection, law enforcement, libraries, and county operations. The county follows California's property tax system established by Proposition 13 (1978), which caps the base tax rate at 1% of assessed value plus voter-approved debt service and special assessments. Property is reassessed to current market value only upon sale or completion of new construction, with annual assessment increases limited to 2% for existing properties.

The effective tax rate in Siskiyou County typically ranges from 1.00% to 1.25% of assessed value, depending on your specific location within the county. This variation occurs because properties may be subject to additional assessments from school districts, fire districts, community services districts, and other special taxing authorities that serve different areas of the county. Rural properties and those within incorporated cities may have different rate structures based on the services provided in each area.

Section 2

What Makes Up Your Tax Bill

For Fiscal Year 2025-2026, the following rates apply to properties in Siskiyou County:

ComponentRateDescription
Base County Rate$1.00 per $100General county services, schools, and basic infrastructure
School District Bonds$0.05-$0.15 per $100Varies by school district - voter-approved facility improvements
Fire District Assessment$0.02-$0.08 per $100Local fire protection services (varies by district)
Community Services District$0.03-$0.10 per $100Water, sewer, parks (applicable areas only)
Total Effective Rate$1.00-$1.25 per $100Actual rate depends on property location

Note: These rates were officially adopted by the Siskiyou County Board of Supervisors in September 2024. Properties within different special taxing districts will have varying total rates based on local voter-approved assessments and the specific services provided in each area.

Section 3

When Are Property Taxes Due?

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

First Installment
Nov 1
Delinquent after Dec 10
Second Installment
Feb 1
Delinquent after Apr 10
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 Siskiyou County are triggered by changes in property ownership or completion of new construction during the fiscal year (July 1 - June 30). When these events occur, the Assessor's Office issues a supplemental assessment under Senate Bill 813 to capture the difference between the old assessed value and the new market value for the remainder of the tax year.

For example, if you purchase a home in January 2025 for $450,000 that was previously assessed at $320,000, you would receive a supplemental tax bill for the difference ($130,000) prorated for the remaining months of the fiscal year (February through June). This supplemental assessment is a one-time adjustment and does not affect future annual assessments. The supplemental bill is typically mailed 4-8 weeks after the triggering event and becomes due immediately upon receipt.

Example Calculation

Here are three property tax scenarios for Fiscal Year 2025-2026 in Siskiyou County:

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Less Homeowner's Exemption: -$7,000 (if applied for)
  • Net Taxable Value: $293,000
  • Tax Rate (1.08%): $293,000 × 0.0108 = $3,164
  • Annual Tax: $3,164 | Monthly: $264

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Less Homeowner's Exemption: -$7,000 (if applied for)
  • Net Taxable Value: $593,000
  • Tax Rate (1.12%): $593,000 × 0.0112 = $6,642
  • Annual Tax: $6,642 | Monthly: $554

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Less Homeowner's Exemption: -$7,000 (if applied for)
  • Net Taxable Value: $993,000
  • Tax Rate (1.18%): $993,000 × 0.0118 = $11,717
  • Annual Tax: $11,717 | Monthly: $976

Note: All exemptions require separate application and are not automatically applied. Tax rates vary by special district.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Siskiyou County require property tax escrow accounts to ensure timely payment of property taxes. Your lender collects monthly escrow payments equal to your estimated annual property tax divided by 12, plus a small reserve cushion. The lender then pays your property taxes directly to the county on the November 1st and February 1st due dates.

If your property taxes are escrowed, you should still review your annual tax bill for accuracy and notify your lender of any discrepancies. Your lender will provide an annual escrow statement showing deposits, payments, and any required adjustments to your monthly payment. If your assessment increases significantly due to improvements or reassessment, your lender may require additional escrow payments to cover the higher tax amount. You can verify that payments were received by checking the Siskiyou County Treasurer-Tax Collector's online portal or calling their office at the number listed on your tax bill.

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 Siskiyou County for FY 2025-2026? A: First installment is due November 1, 2025, and second installment is due February 1, 2026. Payments are considered on time if received by 5:00 PM on the next business day if the due date falls on a weekend or holiday.

Q: What is the Homeowner's Exemption and how do I apply? A: The Homeowner's Exemption reduces your assessed value by $7,000, saving approximately $70-80 annually. You must apply separately - it's not automatic. New property owners receive an application in the mail, but you must file within one year of purchase.

Q: Are there other tax credits available that require application? A: Yes, including the Disabled Veterans' Exemption, Senior Citizens' Property Tax Assistance, and the Blind Exemption. All require separate applications with specific deadlines and eligibility requirements. Contact the Assessor's Office for details and application forms.

Q: How often is my property reassessed? A: Properties are reassessed to market value only upon change of ownership or completion of new construction. Otherwise, assessments can increase a maximum of 2% annually under Proposition 13.

Q: What happens if I pay my property taxes late? A: First installment becomes delinquent December 10th with 10% penalty. Second installment becomes delinquent April 10th with 10% penalty plus additional costs. After five years of delinquency, the property may be sold at tax sale.

Q: Can I pay my property taxes online? A: Yes, Siskiyou County offers online payment options through their official website. Electronic payments, credit cards, and e-checks are typically accepted with associated processing fees.

Q: How do special district taxes affect my bill? A: Properties may be subject to additional assessments from school districts, fire districts, hospital districts, and community services districts depending on location. These voter-approved assessments appear as separate line items on your tax bill.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed between July 2nd and September 15th (or 60 days after receiving a notice of supplemental assessment). Contact the Assessment Appeals Board for forms and procedures. You may need professional appraisal support for your appeal.

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