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Updated 2025 Tax Year

Trinity County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
~1.026% (1% base + voter-approved assessments), varies by Tax Rate Area (TRA)
1st Due
Nov 1
2nd Due
Feb 1
Exemptions
5+ Available
Section 1

How Property Tax Works

Trinity County's property tax system is the primary funding mechanism for essential local services including schools, fire protection, law enforcement, libraries, and county government operations. The county operates under California's Proposition 13 framework, which limits the base property tax rate to approximately 1% of assessed value, with additional voter-approved debt service and special assessments bringing the total effective rate to approximately 1.026% for most areas within the county.

Property tax rates in Trinity County vary by location due to special taxing districts, school districts, and community services districts that may impose additional assessments. The county uses a Tax Rate Area (TRA) system to determine the exact rate for each property based on which special districts serve that particular location. Property owners should verify their specific TRA code to determine their exact tax rate, as rates can differ significantly even between neighboring properties.

Section 2

What Makes Up Your Tax Bill

Levy Year: FY 2025-2026

ComponentRateDescription
General Tax1.000000Base county property tax rate
Debt Service0.026410Unitary debt service assessment
Total Base Rate1.026410Combined rate for most areas

Note: This represents the base rate structure. Actual rates vary by Tax Rate Area (TRA) within Trinity County depending on local special districts, school districts, fire districts, and other municipal services. Properties may be subject to additional Mello-Roos Community Facilities District (CFD) assessments, school bond measures, and other voter-approved debt service charges. Contact the Trinity County Assessor's Office to determine your property's specific TRA code and applicable tax rate.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Trinity 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 property taxes are triggered when there is a change in ownership or completion of new construction that increases a property's assessed value. When these events occur, the county reassesses the property at current market value rather than the Proposition 13-limited assessed value. The supplemental tax represents the difference between the new assessment and the previous assessment, prorated for the remaining months in the fiscal year.

For example, if a property was previously assessed at $400,000 and sells for $650,000 in October, the county will issue a supplemental tax bill for the $250,000 increase in assessed value. This additional assessment would be prorated from the date of sale through June 30th (the end of the fiscal year). The supplemental tax is calculated by multiplying the increase in assessed value by the applicable tax rate and the proration factor. Property owners typically receive supplemental tax bills separately from their regular annual tax bills, and these must be paid according to the specific due dates shown on the supplemental bill.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Homeowners' Exemption: -$7,000 (saves approximately $72)
  • Net Taxable Value: $293,000
  • Tax Rate: 1.026410%
  • Annual Tax: $3,007
  • Monthly (if escrowed): $251

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Homeowners' Exemption: -$7,000 (saves approximately $72)
  • Net Taxable Value: $593,000
  • Tax Rate: 1.026410%
  • Annual Tax: $6,087
  • Monthly (if escrowed): $507

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Homeowners' Exemption: -$7,000 (saves approximately $72)
  • Net Taxable Value: $993,000
  • Tax Rate: 1.026410%
  • Annual Tax: $10,192
  • Monthly (if escrowed): $849

Note: The Homeowners' Exemption requires annual application and is not automatic. Additional tax credits may be available for seniors, veterans, or disabled persons, but all require separate applications with specific deadlines.

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Section 5

Escrow & Property Taxes

Most mortgage lenders require property tax payments to be included in monthly mortgage payments through an escrow account. The lender collects 1/12th of the annual property tax bill each month along with your mortgage payment, then pays the county directly when taxes are due. Trinity County property taxes are typically paid in two installments: the first installment covers July through December and is due by December 10th, while the second installment covers January through June and is due by April 10th.

Property owners should verify that their lender is making timely payments and paying the correct amount, as the property owner remains ultimately responsible for tax payments even when using escrow. At closing, lenders typically collect several months of property taxes in advance to establish the escrow account. When property taxes increase due to reassessment or voter-approved measures, lenders will adjust monthly escrow payments and may require additional escrow deposits to cover shortfalls.

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 Trinity County for the current fiscal year? A: For FY 2025-2026, the first installment is delinquent after 5:00 PM on December 10th, and the second installment is due by April 10th. A 10% penalty applies immediately after the delinquency dates.

Q: What tax credits are available and how do I apply? A: The Homeowners' Exemption provides a $7,000 reduction in assessed value (saving approximately $70-80 annually) and requires annual application. Additional credits may be available for seniors (age 65+), veterans with disabilities, and disabled persons. All credits require separate applications with the County Assessor's Office by specific deadlines.

Q: How does the Homestead exemption work in California? A: California does not have a traditional "homestead exemption." The Homeowners' Exemption reduces assessed value by $7,000 and must be filed annually. Proposition 13 limits assessment increases to 2% per year, but this is automatic and does not require filing.

Q: When are properties reassessed? A: Properties are reassessed upon change of ownership or completion of new construction. Otherwise, assessed values can only increase by a maximum of 2% annually under Proposition 13.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Trinity County Assessment Appeals Board between July 2nd and September 15th. Late applications may be accepted under specific circumstances with documented evidence of reduced property value.

Q: What happens if I pay my property taxes late? A: A 10% penalty is applied immediately after 5:00 PM on the delinquency date. Additional penalties and interest continue to accrue, and properties can eventually be sold at tax sale for unpaid taxes.

Q: Can I pay property taxes online? A: Contact the Trinity County Treasurer-Tax Collector's office to verify available online payment options and accepted payment methods.

Q: What are special district taxes? A: These are additional taxes for services like fire protection, library services, lighting districts, or school bonds. The specific districts affecting your property are determined by your Tax Rate Area (TRA) code.

Q: How do Mello-Roos taxes work? A: Mello-Roos Community Facilities District (CFD) assessments fund infrastructure and services in specific areas. These appear as separate line items on your tax bill and typically have defined payoff periods.

Q: What if I disagree with a supplemental tax bill? A: Supplemental tax assessments can be appealed, but strict deadlines apply. Contact the County Assessor's Office immediately if you believe a supplemental assessment is incorrect.

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