Connecticut property tax guide

Connecticut has no county government, so your town sets the one mill rate that funds both town services and schools. This guide explains how that rate turns into a bill, why assessments are 70% of market value, and how to appeal.

Towns covered
168FY2027 rates
Median mill rate
27.470mills
Range
9.800–69.950mills
Rates published by
Connecticut Office of Policy and Management

What a mill rate is

Connecticut writes property tax rates in mills. One mill is $1 of tax for every $1,000 of assessed value. A mill rate of 27.540 means $27.540 of tax for every $1,000 of assessment. To get a bill, multiply the assessment by the mill rate and divide by 1,000.

Each town adopts its budget, then sets the mill rate needed to raise it. The Office of Policy and Management (OPM) collects every town's rate. This site shows the town-wide real and personal property rate from OPM's file for 168 towns, from FY2021 to FY2027.

In FY2027, the middle town's rate is 27.470 mills. Rates run from 9.800 in Salisbury to 69.950 in Hartford.

The 70% assessment rule

Connecticut law requires towns to assess property at 70% of its market value. The legislature's research office summarizes it this way: "Connecticut requires them to assess all types of property at 70% of fair market value."

So the value on your bill isn't what your home would sell for. A home worth $400,000 at the last revaluation is assessed at about $280,000, and that's the figure to use with the mill rate.

Revaluations

Towns must revalue all property "at least once every five years," according to the same report. Between revaluations, assessments generally stay put while market values move. When a town revalues, assessments are reset, and the mill rate usually falls if values went up, because the same budget is spread over a bigger grand list.

That's why a big drop in a town's mill rate doesn't necessarily mean a smaller bill. Because towns revalue in different years, comparing mill rates between towns is only a rough guide.

The tax year

OPM records rates by fiscal year ending June 30. The FY2027 rate applies to bills issued from July 2026, based on the grand list of property each town compiled the October before. Each town's tax collector sets its own installment schedule and due dates, which are printed on your bill.

Relief programs

OPM lists these state tax relief programs, which are applied through your town:

  • Homeowners' Elderly/Disabled (Circuit Breaker) Tax Relief Program
  • Homeowners' Elderly/Disabled (Freeze) Tax Relief Program
  • Additional Veterans Tax Relief Program
  • Totally Disabled Tax Relief Program
  • Renters' Rebate for Elderly/Disabled Renters

Towns can also offer their own local option exemptions, abatements, freezes and deferrals, mostly for seniors, veterans, people with disabilities and volunteer emergency responders. The legislature's research office keeps a summary. Ask your town assessor what your town offers.

Appealing your assessment

Appeals go to your town's Board of Assessment Appeals. Under state law, the written appeal must be filed "on or before February twentieth" following the grand list date. If your town received an extension for its grand list, the deadline moves to March 20, with hearings in April.

Your appeal must include your own estimate of the property's value. For commercial, industrial, utility or apartment property assessed above $1 million, the board may decline to hold a hearing. If you disagree with the board's decision, you can appeal to the Superior Court for the judicial district where the property is located.

What this data leaves out

  • Special districts. Fire, sewer and similar districts in some towns levy their own rate on top of the town rate. OPM's file lists them, but this site doesn't include them yet.
  • Motor vehicle rates. Cars are taxed separately, and some towns use a different rate for them.
  • Towns without a town-wide rate. Where OPM's file shows no town-wide rate for a year, we leave that year out rather than guess.

A worked example with real rates

New Fairfield sits near the middle of Connecticut's rates. Its FY2027 mill rate is 27.540 mills.

On an assessed value of $350,000, that is $350,000 × 27.540 ÷ 1,000 = $9,639 a year, before exemptions or credits.

The same home in another town can owe far more or less, so look up your own on the Connecticut rates page, or use the property tax calculator.

Sources

Every statement in this guide comes from one of these publications. Rates on this site are copied from the state file listed first, exactly as published.

  1. Connecticut Office of Policy and Management, Mill Rates for FY 2014-2027
  2. Connecticut General Assembly, Office of Legislative Research, Property Assessment and Revaluation (2008-R-0358)
  3. CT Office of Policy and Management, Statutes Governing Property Assessment and Taxation (including CGS 12-111)
  4. CT Office of Policy and Management, Tax Relief Programs
  5. Connecticut General Assembly, Office of Legislative Research, Local Option Property Tax Relief Programs for Homeowners (2026-R-0001)

This guide explains how the system works. It isn't legal or tax advice, and local rules and dates can change. Your assessor, tax collector or the agency linked above has the final word. Last reviewed 2026-10-26. Spotted an error? Email [email protected].