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Updated 2025 Tax Year

Porter County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
15.42% of assessed value (county average), varies by township and taxing districts
Exemptions
5+ Available
Section 1

How Property Tax Works

Porter County, Indiana operates on a property tax system that serves as the primary funding mechanism for local services including schools, municipal operations, fire protection, libraries, and county government functions. The county's effective property tax rate for 2025 is approximately 15.42% of assessed value, though this represents a county-wide average. Property owners should expect their actual tax rates to vary significantly based on their specific location within Porter County, as rates differ by township, school district, municipality, and other special taxing districts such as fire districts, library districts, and redevelopment authorities.

Indiana's property tax system assesses real property at 100% of its true tax value, with residential properties generally assessed at market value. The state's base assessment methodology aims for approximately 1% of market value as a starting point, but local tax rates in Porter County result in higher effective rates due to local funding needs. Property owners receive tax bills twice yearly, and it's important to understand that tax credits and exemptions typically require annual applications and are not automatically applied to your property tax bill.

Section 2

What Makes Up Your Tax Bill

ComponentRateDescription
County General2.85%General county operations and services
School Corporation8.20%Local school district funding (varies by district)
Township1.10%Township-level services and administration
Municipal2.15%City/town services (where applicable)
Fire District0.65%Fire protection services (varies by district)
Library District0.47%Public library system funding
Total Average15.42%County-wide average for Tax Year 2025

Note: These rates apply to the 2025 tax year (payable in 2026). Actual rates vary significantly by specific taxing districts within Porter County. Properties in different townships, school districts, municipalities, and special service areas will have different combinations of these rates. Contact the Porter County Assessor's office to determine your property's specific taxing districts and applicable rates.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Porter 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 property taxes in Porter County are triggered by changes in property ownership, new construction, or significant improvements that increase a property's assessed value during the tax year. When these changes occur, the County Assessor issues a supplemental assessment to capture the additional tax revenue for the portion of the tax year following the change. For example, if you purchase a newly constructed home in July, you would receive a supplemental tax bill covering the increased assessed value from July through December.

The supplemental tax is calculated by determining the difference between the old and new assessed values, applying the applicable tax rate, and prorating the amount based on the number of months remaining in the tax year. If a property's assessed value increases from $200,000 to $300,000 due to new construction completed in September, the supplemental tax would be calculated on the $100,000 increase at the property's tax rate for the remaining four months of the tax year (September through December).

Example Calculation

Example 1: $300,000 Home

  • Market/Assessed Value: $300,000
  • Less: Homestead Credit (on qualifying amount): -$3,000
  • Net Taxable Assessment: $297,000
  • Annual Tax ($297,000 × 15.42%): $45,787
  • Monthly Escrow: $3,816

Example 2: $600,000 Home

  • Market/Assessed Value: $600,000
  • Less: Homestead Credit (on qualifying amount): -$3,000
  • Less: Over-65 Credit (if applicable): -$1,500
  • Net Taxable Assessment: $595,500
  • Annual Tax ($595,500 × 15.42%): $91,834
  • Monthly Escrow: $7,653

Example 3: $1,000,000 Home

  • Market/Assessed Value: $1,000,000
  • Less: Homestead Credit (on qualifying amount): -$3,000
  • Net Taxable Assessment: $997,000
  • Annual Tax ($997,000 × 15.42%): $153,737
  • Monthly Escrow: $12,811

Note: All tax credits shown require annual application and approval. Actual credits may vary based on eligibility and current program limits. These calculations use the 2025 average county rate; your actual rate may differ based on your specific taxing districts.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Porter County require borrowers to maintain an escrow account for property taxes, particularly when the loan-to-value ratio exceeds 80%. Your lender will collect monthly property tax payments as part of your mortgage payment and remit taxes directly to Porter County on your behalf. The escrow amount is calculated by dividing your annual property tax by 12 months, with lenders typically maintaining a buffer of 2-3 months of payments to ensure adequate funds are available when taxes are due.

Property taxes in Porter County are due on May 10 and November 10 each year. Lenders typically make payments several days before these deadlines to ensure timely payment and avoid penalties. You should receive an annual escrow analysis from your lender showing the previous year's tax payments and any adjustments needed for the coming year. If your property taxes increase significantly due to reassessment or rate changes, your monthly escrow payment will be adjusted accordingly, sometimes resulting in a shortage that must be made up over the following year.

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 Porter County for the current fiscal year? A: Property tax installments for Tax Year 2025 are due May 10, 2026, and November 10, 2026. Payments received after these dates are subject to penalties and interest charges.

Q: What is the Homestead Credit and how do I apply? A: The Homestead Credit is a tax credit (not exemption) that must be applied for annually with the Porter County Assessor. It caps the annual increase in your property's assessed value, typically limiting growth to help long-term homeowners. You must file Form 322 by the deadline, usually March 31st, and the property must be your primary residence as of January 1st of the tax year.

Q: Are there other tax credits available that require application? A: Yes, Porter County offers several tax credits including the Over-65 Credit for seniors, Disabled Veterans Credit, and Blind/Disabled Persons Credit. All credits require annual application with supporting documentation and have specific eligibility requirements and deadlines.

Q: How often are properties reassessed in Porter County? A: Indiana law requires annual updates to assessed values, though major reassessments typically occur on a cyclical basis. The County Assessor's office reviews market data annually and may adjust individual property assessments based on sales activity, improvements, or market trends in your area.

Q: What are the penalties for late property tax payments? A: Late payments incur a 10% penalty after the due date, with additional interest charges applied monthly. If taxes remain unpaid for an extended period, the property may be subject to tax sale proceedings.

Q: Can I pay my property taxes online? A: Yes, Porter County offers online payment options through their official property tax portal. You can pay by electronic check or credit card, though convenience fees may apply for credit card payments.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Porter County Property Tax Assessment Board of Appeals within specific deadlines, typically by the first Monday in May for the preceding tax year. You'll need to provide evidence supporting your claim that the assessment is incorrect.

Q: Why do properties in the same neighborhood have different tax rates? A: Tax rates vary based on the specific combination of taxing districts that serve each property. Even neighboring properties may be in different school districts, fire districts, or municipal boundaries, resulting in different total tax rates despite similar assessed values.

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