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Updated 2025 Tax Year

Union County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
2.0% to 3.5% of market value (varies by municipality and school district)
Exemptions
5+ Available
Section 1

How Property Tax Works

Union County, New Jersey operates on a property tax system that serves as the primary funding mechanism for local municipal services, county operations, and school districts throughout the county's 21 municipalities. Property taxes in Union County fund essential services including public education, police and fire protection, road maintenance, parks and recreation, and county administration. The effective tax rate in Union County typically ranges from approximately 2.0% to 3.5% of market value, depending on your specific municipality and the special taxing districts that apply to your property.

It's important to note that actual tax rates vary significantly by location within Union County due to different municipal tax rates, school district levies, and special taxing districts such as fire districts, library districts, and improvement authorities. Each municipality within Union County sets its own local tax rate, and these are combined with county and school district rates to determine your total property tax bill. Properties are reassessed periodically, and New Jersey does not impose a statewide assessment cap, meaning assessed values can increase based on market conditions and property improvements.

Section 2

What Makes Up Your Tax Bill

The following rates reflect the FY 2025-2026 levy year for Union County:

ComponentRate per $100Description
County Tax~$1.50-2.00Union County operations, parks, sheriff, courts
Municipal Tax~$2.00-4.00Local services, police, fire, public works (varies by municipality)
School Tax~$7.00-9.00Local school district operations and debt service
Special Districts~$0.50-1.50Fire districts, library districts, improvement authorities
Total Composite Rate~$12.35Average combined rate (varies by location)

Note: The composite rate of $12.35 per $100 of assessed value represents an average across Union County. Your actual rate will depend on your specific municipality and which special taxing districts apply to your property. Some areas may have rates as low as $10.00 per $100 or as high as $15.00 per $100 of assessed value.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Union 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 taxes in Union County are additional property tax assessments that occur when there are changes to a property's assessed value during the current tax year. These supplemental bills are most commonly triggered by new construction, major renovations that add significant value, or corrections to the original assessment. When improvements are completed, the county assessor will issue a supplemental assessment for the increased value, and you'll receive a separate tax bill for the additional amount.

Supplemental taxes are calculated by applying the current tax rate to the difference between the new assessed value and the original assessed value, prorated for the portion of the tax year remaining after the assessment date. For example, if you complete a $100,000 addition to your home in July and your property is reassessed with an additional $80,000 in assessed value, you would owe supplemental taxes on that $80,000 for the remaining portion of the tax year (approximately 6 months) at your local tax rate of roughly $12.35 per $100.

Example Calculation

Example 1: $300,000 Market Value Home

  • Assessed Value: $300,000
  • Less: Senior Citizens Tax Credit (if applicable): -$250
  • Net Taxable Value: $299,750
  • Annual Tax ($299,750 × $12.35/$100): $3,701
  • Monthly Escrow Payment: $308

Example 2: $600,000 Market Value Home

  • Assessed Value: $600,000
  • Less: Homestead Credit (if applicable): -$250
  • Net Taxable Value: $599,750
  • Annual Tax ($599,750 × $12.35/$100): $7,407
  • Monthly Escrow Payment: $617

Example 3: $1,000,000 Market Value Home

  • Assessed Value: $1,000,000
  • Less: Available Tax Credits: -$250
  • Net Taxable Value: $999,750
  • Annual Tax ($999,750 × $12.35/$100): $12,347
  • Monthly Escrow Payment: $1,029

Note: All tax credits shown require separate applications and are not automatically applied. Actual credits available depend on your specific circumstances and qualification requirements.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Union County require borrowers to maintain an escrow account for property taxes, especially when the loan-to-value ratio exceeds 80%. Your lender will collect approximately 1/12th of your annual property tax bill each month along with your mortgage payment, then pay your property taxes directly to Union County on the scheduled due dates. Lenders typically conduct an annual escrow analysis to ensure adequate funds are collected, and may adjust your monthly payment up or down based on actual tax bills and account balances.

Property taxes in Union County are due quarterly on February 1, May 1, August 1, and November 1 each year. Your lender will typically pay these installments a few days before each due date to ensure timely payment and avoid penalties. You should receive copies of your property tax bills and payment confirmations, and it's important to verify that payments are made correctly and on time. If you pay your own taxes (without escrow), remember that payments are considered late after a 10-day grace period, and interest and penalties will apply to late payments.

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 Union County for FY 2025-2026? A: Property taxes are due quarterly on February 1, May 1, August 1, and November 1. There is a 10-day grace period after each due date before late penalties apply.

Q: What tax credits are available and do they require applications? A: Common tax credits include the Senior Citizens Tax Credit, Disabled Persons Tax Credit, and Veterans Tax Credit. All credits require separate applications filed with your local tax assessor and are not automatically applied to your tax bill.

Q: How does the Homestead Credit work? A: The Homestead Credit is designed to limit assessment increases on your primary residence, typically capping annual assessment growth at around 10%. You must file an application with your local assessor to receive this benefit - it is not automatic and must be renewed periodically.

Q: How often are properties reassessed in Union County? A: Reassessment schedules vary by municipality within Union County. Most municipalities conduct revaluations every 5-10 years, though some may reassess more frequently. Check with your local tax assessor for your municipality's specific schedule.

Q: Can I appeal my property tax assessment? A: Yes, you can appeal your assessment to your local tax assessor first, then to the Union County Board of Taxation if needed. Appeals typically must be filed by April 1st or within 45 days of receiving a new assessment notice.

Q: What are the penalties for late property tax payments? A: Interest charges of 8% per year are applied to late payments, calculated from the original due date. Additional penalties may apply for payments more than 30 days late.

Q: Can I pay my property taxes online? A: Yes, Union County offers online payment options through the county website and most municipalities provide online payment systems. Credit card payments may incur additional processing fees.

Q: Why do properties in different Union County municipalities have different tax rates? A: Each municipality sets its own local tax rate based on their budget needs, and properties may also be subject to different special district taxes such as fire districts or library districts, resulting in varying total tax rates across the county.

Q: What triggers a supplemental tax bill? A: Supplemental taxes are issued when property improvements are completed, errors in the original assessment are corrected, or when new construction adds value to your property during the current tax year.

Q: Do I qualify for any property tax relief programs? A: New Jersey offers various relief programs including the Homestead Benefit for eligible homeowners. These programs have specific income and residency requirements and require separate applications through the state Division of Taxation.

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