Colusa County Property Tax Estimate & Tax Calculator

Estimate your Colusa County property tax for the 2026-27 tax year using assessed value, local tax-rate context, exemptions, and parcel-specific charges. This calculator is built for Colusa County areas such as Colusa, Williams, Arbuckle, Maxwell, Grimes, Princeton, Stonyford, and countywide-unitary areas, where TRA assignments and direct charges can differ by parcel.

Colusa County Property Tax Calculator

Estimated annual property tax

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Taxable assessed value

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Ad valorem tax

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Direct charges

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Monthly estimate

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Two installment estimate

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Projected next-year assessed value

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  • 08 Local Areas
  • August 2026 Updated
  • No Signup Required
  • Annual + Monthly Estimates

Colusa CA Property Tax Due Dates 2026-27

Colusa County secured property taxes follow California’s two-installment schedule. The first installment is due November 1, and the second installment is due February 1. The key delinquency dates for avoiding penalties are December 10 and April 10.

First Installment

November 1, 2026 First installment of the 2026–27 secured property tax bill.

First Installment Delinquent

December 10, 2026 A 10% penalty applies after 5:00 p.m. if the first installment remains unpaid.

Second Installment

February 1, 2027 Second installment of the 2026–27 secured property tax bill.

Second Installment Delinquent

April 10, 2027 A 10% penalty plus a $10 cost applies after 5:00 p.m. if unpaid.

Important: December 10, 2026 and April 10, 2027 fall on weekdays, so the normal deadlines apply. The county notes that when a delinquent date falls on a weekend or legal holiday, payment by 5:00 p.m. on the next business day avoids the penalty.

Colusa County Property Tax Penalties

Late property-tax payments in Colusa County can add penalties and costs to the amount due. Because each installment has its own delinquency date, taxpayers should monitor payment status before the deadline and verify any parcel-specific balance with official county records.

What Happens If You Miss a Payment?

For 2026-27, the first installment becomes delinquent after December 10, 2026 at 5 p.m. or close of business, whichever is later, and a 10% penalty generally applies. The second installment is tied to April 10, 2027; because that date falls on Saturday, confirm the next-business-day deadline. Late second installments generally include a 10% penalty plus a $20 cost, with additional default penalties possible after June 30.

Important Reminder for Property Owners

Colusa County lists a $20 cost after the second-installment delinquency deadline. Keep payment confirmations, tax bill numbers, and parcel details handy, especially when mailing payments or using online systems near the deadline.

Explore More Colusa County Property Resources

Use these Colusa County property resources when you need more than an estimate. They can help you review assessment details, compare local tax-rate assumptions, estimate transfer-related costs, and understand how exemptions, direct charges, and special assessments affect a final bill.

Property Search

Search Colusa County property records by available parcel, owner, address, or assessment details through official property tools.

Tax Rates

Review Colusa County tax-rate context for local cities, communities, districts, and unincorporated areas.

Document Stamp Calculator

Estimate California documentary transfer tax or recording-related transfer costs when a taxable real estate transfer applies.

Property Guide

Explore Colusa County property guidance covering assessment records, ownership changes, tax bills, and local property research.

How to Calculate Your Colusa County Property Tax

Start with the assessed value, choose the closest Colusa County local area, and add known exemptions, assessments, or direct charges from the tax bill. The calculator provides a planning estimate, not an official tax bill from the county.

Step 1

Enter the assessed value used for taxation before exemptions, local charges, or special assessments are added.

Step 2

Select a representative city, community, district, or unincorporated area from the local-area dropdown.

Step 3

Enter the exact TRA rate if your parcel's official tax-rate area is known from county or BOE records.

Step 4

Apply the homeowner exemption if the property is owned and occupied as a qualifying principal residence.

Step 5

Add special assessments or fixed charges that appear separately on the Colusa County tax bill.

Step 6

Include Mello-Roos or CFD charges if the parcel is inside a community facilities district.

Step 7

Enter parcel taxes or direct local charges tied to schools, services, districts, or voter-approved obligations.

Step 8

Use a projected assessed-value increase for planning, while actual changes remain governed by California assessment law.

Step 9

Click Calculate Tax to combine taxable value, rate, exemptions, and charges into an estimated property-tax result.

Colusa County Property Tax Calculation Formula

Property Tax Estimate = ((Assessed Value – Eligible Exemption) x Applicable Tax Rate) + Voter-Approved Debt + Special Assessments + Fixed Charges + Mello-Roos/CFD Charges + Parcel Taxes or Other Direct Charges

For example: If a taxable Colusa County value is $365,000 and the selected local rate is 1.1300%, the ad valorem estimate is about $4,124 before parcel-specific bonds, direct charges, or assessments are added.

Visit Other California County Property Tax Calculators

Property-tax estimates should be county-specific because California parcels are assigned to tax-rate areas with different schools, districts, bonds, and direct assessments. Neighboring counties can share statewide rules while producing very different local tax bills.

Glenn County

Butte County

Yolo County

Santa Clara County

Lake County

Yuba County

Pros

  • Quick Tax Estimates
  • Assessed Value Input
  • Area-Based Tax Rates
  • Custom Tax Rate
  • Homeowner Exemption
  • Special Assessments
  • Mello-Roos Charges
  • Local Parcel Charges
  • Monthly & Installment Estimates
  • Projected Property Value

Cons

  • Estimate Only
  • No Parcel-Specific
  • Exact TRA Required
  • Exemption Eligibility
  • Local Tax Variations

FAQ's

A parcel in Colusa may have a different local rate and direct-charge mix than one in Williams, Arbuckle, or Maxwell.

California Proposition 13 generally limits annual assessed-value increases unless a reassessment event occurs. A purchase, ownership change, or assessable new construction can create a new base value.

Yes. A purchase or ownership change can trigger a supplemental assessment when the new assessed value differs from the prior value. Supplemental bills are separate from the regular secured tax bill.

Refinancing alone usually does not reassess the property because ownership has not changed. Title transfers or ownership restructuring should be reviewed before assuming there is no assessment effect.

Assessable new construction can add value to the tax roll. Repairs and routine maintenance are treated differently, so owners should verify major improvement questions with the county Assessor.

A qualifying exemption can reduce the taxable value or tax liability, but eligibility must be verified. The calculator lets users enter exemption information when it applies to the property.

Use the official Colusa County Treasurer-Tax Collector payment or bill lookup system, or contact the county directly. Calculator results do not confirm paid, unpaid, or delinquent status.

Collect the assessed value, parcel number, tax bill, local area, homeowner exemption status, TRA rate if known, special assessments, and direct charges.

The official bill may include parcel-specific bonds, direct assessments, supplemental taxes, prior balances, penalties, corrections, or payment-processing details not captured by general inputs.

Property owners who disagree with an assessed value should contact the county Assessor and confirm formal assessment appeal deadlines, forms, evidence requirements, and filing procedures.

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