HonestCasa logoHonestCasa
Updated 2025 Tax Year

Boone County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
1.2% to 1.6% of assessed value, varies by taxing district and location within county
1st Due
May 10
2nd Due
Nov 10
Exemptions
5+ Available
Section 1

How Property Tax Works

Boone County, Indiana operates under a property tax system that funds essential local services including schools, libraries, fire protection, and county government operations. Property taxes are calculated based on the assessed value of real estate and personal property, with the county utilizing Indiana's standard assessment practices that aim to reflect fair market value as of a specific assessment date.

The effective tax rate in Boone County varies significantly by location within the county due to overlapping special taxing districts such as school corporations, library districts, fire departments, and other local units of government. For the 2025 tax year, rates typically range from approximately 1.2% to 1.6% of assessed value depending on your specific location and the combination of taxing districts that serve your property. Property owners should note that their exact tax rate depends on which school district, library district, and other special service areas encompass their property.

Section 2

What Makes Up Your Tax Bill

ComponentRate (per $100 AV)Description
County General0.132810Basic county services and operations
School CorporationVaries by districtLocal school funding (varies by Zionsville, Lebanon, Western Boone, etc.)
Library DistrictVaries by districtPublic library services
Fire ProtectionVaries by districtLocal fire department funding
Parks & RecreationVaries by districtMunicipal and county parks
Municipal ServicesVaries by city/townCity/town services where applicable
Debt ServiceVaries by districtBond payments for capital projects

Levy Year: These rates apply to the 2025 tax year (payable in 2025). The total combined rate varies significantly across Boone County locations, ranging from approximately $1.20 to $1.60 per $100 of assessed value depending on your specific combination of taxing districts. Properties in incorporated areas typically have higher rates due to additional municipal services.

Section 3

When Are Property Taxes Due?

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

First Installment
May 10
Delinquent after Dec 10
Second Installment
Nov 10
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 in Boone County are additional tax bills issued when there are changes to property ownership, improvements, or corrections to assessments that occur after the main tax roll has been finalized. Common triggers include the sale or transfer of property to a new owner, completion of new construction or major renovations, and corrections to assessment errors discovered after the regular billing cycle.

When a supplemental tax is issued, it covers the difference between the previously assessed tax amount and the new correct amount, prorated for the portion of the tax year affected by the change. For example, if you purchase a home in July that was previously under-assessed, you may receive a supplemental bill covering the additional tax owed from July through the end of the tax year. These bills maintain the same due date structure as regular property taxes and are subject to the same penalty provisions if paid late.

Example Calculation

Example 1: $300,000 Property

  • Assessed Value: $300,000
  • Standard Homestead Deduction: $49,100 (requires application)
  • Net Taxable Value: $250,900
  • Tax Rate: $1.35 per $100 (example rate)
  • Annual Tax: $3,387
  • Monthly Escrow: $282

Example 2: $600,000 Property

  • Assessed Value: $600,000
  • Standard Homestead Deduction: $49,100 (requires application)
  • Net Taxable Value: $550,900
  • Tax Rate: $1.40 per $100 (example rate)
  • Annual Tax: $7,713
  • Monthly Escrow: $643

Example 3: $1,000,000 Property

  • Assessed Value: $1,000,000
  • Standard Homestead Deduction: $49,100 (requires application)
  • Net Taxable Value: $950,900
  • Tax Rate: $1.45 per $100 (example rate)
  • Annual Tax: $13,788
  • Monthly Escrow: $1,149

Note: All deductions require annual application and are not automatically applied. Tax rates vary by specific location within Boone County based on local taxing districts.

See How Taxes Affect Your Payment

Property taxes are just part of your total monthly cost. Get the full picture.

Calculate Now
Section 5

Escrow & Property Taxes

Most mortgage lenders in Boone County require borrowers to maintain an escrow account for property tax payments, particularly when the loan-to-value ratio exceeds 80%. Your lender collects monthly payments equal to approximately 1/12th of your annual property tax bill and holds these funds in a separate escrow account. The lender then pays your property taxes directly to Boone County on your behalf when the May 10 and November 10 due dates arrive.

Lenders typically conduct annual escrow analyses to ensure adequate funds are collected, and may adjust your monthly payment if property taxes increase or decrease significantly. You should receive an annual escrow statement showing all deposits and payments made from your account. If you pay off your mortgage or refinance, you're responsible for making property tax payments directly to the county. Property owners can verify their tax payments and escrow activity through the Boone County Treasurer's office or 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 Boone County for 2025? A: Property taxes are due in two equal installments on May 10, 2025 and November 10, 2025, as established by Indiana Code 6-1.1-22-9(a).

Q: What homestead tax credit is available and how do I apply? A: The Standard Homestead Deduction provides a $49,100 reduction in assessed value for qualifying primary residences. You must file Form 136 with the County Assessor by April 1st annually. This is not automatic and requires application.

Q: How does the homestead deduction work? A: The homestead deduction reduces your assessed value by $49,100, which lowers your taxable amount. It does not cap assessment increases - it simply provides a flat deduction from your home's assessed value each year you qualify.

Q: Are there other tax credits available that require application? A: Yes, including credits for disabled veterans, senior citizens (age 65+), and disabled persons. Each requires separate application with specific forms and deadlines. Contact the Boone County Assessor at (765) 482-3510 for eligibility requirements and applications.

Q: How often are properties reassessed in Boone County? A: Indiana law requires annual updates to assessments, though comprehensive reappraisals typically occur every 4-6 years. The County Assessor reviews market trends and adjusts values annually based on sales data and other market indicators.

Q: How do I appeal my property assessment? A: File a petition with the Boone County Property Tax Assessment Board of Appeals by the deadline stated on your assessment notice (typically 45 days). If unsatisfied, you can appeal to the Indiana Board of Tax Review.

Q: What is the penalty for late property tax payments? A: Indiana law imposes a 10% penalty on unpaid taxes after the due date, plus interest. Additional penalties may apply for severely delinquent payments that could lead to tax sale proceedings.

Q: Can I pay property taxes online? A: Yes, Boone County offers online payment options through their official website. Contact the Boone County Treasurer's office at (765) 482-3040 for current online payment portal information and accepted payment methods.

Q: Why does my tax rate differ from my neighbor's? A: Tax rates vary based on the specific combination of taxing districts serving your property, including school corporation, library district, fire department, and municipal services. Properties in different districts or municipalities will have different total tax rates.

Q: What triggers a supplemental tax bill? A: Supplemental taxes are issued for property transfers, new construction completion, major improvements, or assessment corrections discovered after the main tax roll is finalized. These bills are prorated for the affected portion of the tax year.

See the Full Picture of Your Home Costs

Property taxes are just one piece of homeownership. HonestCasa helps you understand your total monthly cost and explore safe ways to access your home equity.

Total Monthly Cost

Mortgage + taxes + insurance + HOA

Equity Growth

Track how your equity grows over time

Safe Equity Access

Options for projects or debt payoff

Free • No credit check • 2-minute estimate