When are property taxes due in Middlesex County, Connecticut?

Middlesex County property taxes are due July 1. A second installment is due January 1. This deadline applies to all counties in Connecticut.

What is the penalty for late property tax payment in Middlesex County, Connecticut?

The late payment penalty in Middlesex County is 1.5% per month (18% annual).

How do I pay Middlesex County, Connecticut property taxes?

You can pay Middlesex County property taxes via Online, mail, in-person.

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Middlesex County Property Tax Due Date

Connecticut

2026 Property Tax Due Dates

Installment 1in 44 days

July 1

First installment

Installment 2overdue

January 1

Second installment

Penalty: 1.5% per month (18% annual)Grace period: 1 month (Aug 1 / Feb 1)

Payment Methods

Online, Mail, In-Person

Middlesex County Treasurer

How to Pay

Online

Pay using credit card or e-check

By Mail

Mail check payable to Middlesex County Treasurer

In Person

Visit the Treasurer's office

About Property Taxes in Connecticut

Connecticut property taxes are administered entirely at the town and city level — the state has no counties with governmental functions. Each of Connecticut's 169 municipalities has its own assessor who determines property values and its own mill rate. This means rates and policies vary significantly from town to town. Property is assessed at 70% of fair market value (this percentage is set by state law). Grand Lists (the official assessment rolls) are updated annually and full revaluations are conducted at least every five years. Connecticut consistently ranks among the states with the highest property tax burdens relative to home values.

Payment & Assessment

Payment schedules vary by town. Most Connecticut municipalities bill property taxes semi-annually: First installment: Due July 1 Second installment: Due January 1 Some municipalities bill quarterly. A grace period of 30 days typically applies, making the effective due dates August 1 and February 1 before interest begins. Late interest: 1.5% per month (18% annually) on unpaid balances, with a minimum of $2.00. Most towns offer online payment through their municipal website or a payment portal. Contact your town's tax collector for available payment methods.

Statewide framework for Connecticut. Your county's specific rates and deadlines are shown above.