The Connecticut Grand List is the annual inventory that each of the state’s 169 towns compiles of every taxable property inside its borders, together with the assessed value of each one. Your town’s Grand List is the base its budget is divided into to set the mill rate, which is then multiplied by your assessment to produce your property tax bill. In practical terms, whatever ends up next to your name on that list on October 1 controls what you owe for the coming tax year.
What Property Ends Up on the Grand List
Three categories of property are taxable in Connecticut, and each lands on the Grand List differently.
Real estate is the largest share. It covers land plus anything permanently attached: houses, commercial buildings, barns, factories, quarries, and even air-space easements above the ground.1Justia. Connecticut Code 12-64 – Real Estate Partially completed construction counts too. The assessor lists real estate under whoever holds title in the land records.
Motor vehicles are taxed in the town where the vehicle normally leaves from and returns to, which is usually the owner’s town of residence.2Justia. Connecticut Code 12-71 – Personal Property Other Than Motor Vehicles Both registered and unregistered vehicles are subject to the tax. Antique or special-interest vehicles get a capped assessment of no more than $500.
Business personal property covers tangible assets used in a trade or profession: machinery, office furniture, electronics, leasehold improvements, and fixtures in stores, restaurants, hotels, and factories. Unlike real estate and vehicles, these assets only appear on the Grand List if the owner files a declaration with the assessor by November 1 each year. Missing that deadline, or leaving assets off the form, triggers a penalty of 25 percent of the assessment on the undeclared property.3Justia. Connecticut Code 12-41 – Filing of Declaration Business owners who need more time can request a written extension of up to 45 days from the assessor on or before November 1.4Justia. Connecticut Code 12-42 – Extension for Filing Declaration
The 70 Percent Assessment Rule
Property in Connecticut is not taxed on its full market value. Every taxable property is assessed at 70 percent of its fair market value.5Connecticut General Assembly. Personal Motor Vehicle Property Tax Assessments and Rates Fair market value is the price the property would fetch between a willing buyer and a willing seller, with neither under pressure. If your home would sell for $400,000, the assessor records $280,000 on the Grand List, and the mill rate is applied to that lower figure.
Motor vehicles follow the same 70 percent ratio, with a minimum assessed value of $500.5Connecticut General Assembly. Personal Motor Vehicle Property Tax Assessments and Rates
How the Grand List Turns Into a Tax Bill
A mill equals $1 of tax for every $1,000 of assessed value. Your bill is your assessed value multiplied by the mill rate, divided by 1,000.6Connecticut Office of Policy and Management. Mill Rates
The mill rate itself comes out of the town budget. The Board of Finance or Town Council adopts a budget covering municipal salaries, schools, equipment, and services. Federal and state grants are subtracted. Whatever remains has to be raised through property taxes, and that shortfall divided by the total Grand List produces the mill rate. It then goes to a town meeting where taxpayers can discuss and vote on it.6Connecticut Office of Policy and Management. Mill Rates
One detail catches people off guard. The mill rate for any given fiscal year is based on the Grand List from two years earlier. Rates for the 2025–2026 fiscal year, for example, use the October 1, 2024 Grand List.6Connecticut Office of Policy and Management. Mill Rates So the assessment you see now is what you’ll be paying against in a later cycle.
The Annual Timeline You Need to Know
The Grand List runs on a fixed calendar, and four dates matter:
- October 1 — Assessment date. Whatever you own at 12:01 a.m. on October 1 determines your liability for the coming tax year. The assessor records ownership, condition, and value as of that single snapshot.
- November 1 — Personal property declarations due. Business owners must file by this date, or by the next business day if November 1 is a weekend.7Connecticut Office of Policy and Management. 2025 Declaration of Personal Property
- January 31 — Grand List filed. The completed list is signed and lodged for public inspection in the assessor’s office.8Justia. Connecticut Code 12-55 – Publication of Grand List, Changes in Valuation, Notice of Assessment Increase
- February 20 — Appeal deadline. A written appeal to the Board of Assessment Appeals must be filed by this date.9Justia. Connecticut Code 12-111 – Appeals to Board of Assessment Appeals
The gap between January 31 and February 20 is less than three weeks. If you wait until your tax bill arrives months later to check the numbers, you have already missed the ordinary window to challenge them.
The Supplemental Motor Vehicle List
Vehicles registered after October 1 don’t wait until the next Grand List. They go onto a supplemental motor vehicle list. For assessment years beginning October 1, 2024 and later, vehicles registered between October 1 and March 31 appear on the first supplemental list, with taxes due the following July 1. Vehicles registered from April 1 through September 30 land on a second supplemental list.10Justia. Connecticut Code 12-71b – Taxation of Motor Vehicles Acquired After Assessment Date The tax is prorated based on how many months remain in the assessment year from the date of registration.
Revaluation Every Five Years
Assessed values don’t sit still. Every Connecticut town must conduct a full revaluation of all real property at least once every five years.11Justia. Connecticut Code 12-62 – Revaluation of Real Property The assessor sets a new value for every parcel using mass-appraisal methods that rely on recent sales, construction costs, and income analysis for commercial property.
A physical inspection of each property is required at least once every ten years. The assessor or a contracted appraiser measures the exterior and examines the interior of every building on that cycle. Owners who receive a questionnaire and return satisfactory information can sometimes satisfy the inspection requirement without an in-person visit.11Justia. Connecticut Code 12-62 – Revaluation of Real Property Revaluation years produce the biggest swings in tax bills, so scrutinize your new assessment when your town completes one.
Checking and Appealing Your Assessment
After the Grand List is filed by January 31, it becomes a public document at the assessor’s office.8Justia. Connecticut Code 12-55 – Publication of Grand List, Changes in Valuation, Notice of Assessment Increase Most towns also maintain online databases where you can search property assessments by address or owner name.
To appeal, file a written challenge with your town’s Board of Assessment Appeals by February 20. Include your name, a description of the property, your estimate of its value, and the reason you disagree with the assessor. The board notifies you of a hearing at least seven days in advance and issues a written decision afterward.9Justia. Connecticut Code 12-111 – Appeals to Board of Assessment Appeals
One limit to know: the board can decline to hear appeals on commercial, industrial, utility, or apartment properties assessed above $1 million. If that happens, the board notifies you by March 1 and you can go directly to Superior Court.9Justia. Connecticut Code 12-111 – Appeals to Board of Assessment Appeals If the board rules against you, you have two months from the date it mails its decision to appeal to the Superior Court in the judicial district where the property is located.12Justia. Connecticut Code 12-117a – Appeals From Boards of Tax Review or Boards of Assessment Appeals
Exemptions That Reduce What You Owe
Not every property on the Grand List is taxed on the full assessed amount. Connecticut mandates several exemptions that come off before the mill rate is applied.
Veterans With Disability Ratings
Veterans with a VA disability rating of at least 10 percent qualify for an exemption that scales with the severity of the disability. The base exemption ranges from $2,000 for ratings between 10 and 25 percent up to $3,500 for ratings above 75 percent or for veterans who have reached age 65.13Justia. Connecticut Code 12-81 – Exemptions An additional income-based exemption of either 50 or 200 percent of the base amount is available depending on household income.
Veterans with a permanent and total 100 percent disability rating receive a full exemption on their primary residence and one motor vehicle. If the veteran dies, an unmarried surviving spouse or minor children can continue to receive the exemption.13Justia. Connecticut Code 12-81 – Exemptions Proof of the VA disability rating goes to the municipal assessor.
Elderly and Disabled Homeowner Credit
Connecticut runs a state-funded property tax credit for homeowners who are 65 or older or who are totally disabled. The credit reduces the tax bill by a percentage tied to income. Married homeowners at or below $11,700 in qualifying income receive the largest benefit: up to $1,250 or 50 percent of the tax, whichever is less. The credit phases out above $28,900 for married filers and $23,600 for unmarried filers.14Justia. Connecticut Code 12-170aa – Tax Relief for Elderly or Totally Disabled Homeowners These income thresholds are periodically adjusted, so confirm current figures with your assessor’s office.
What Happens If You Don’t Pay
Delinquent property taxes accrue interest at 18 percent per year, calculated from the original due date until the balance is paid. Any partial month of nonpayment counts as a full month, and the minimum interest charge is $2 per installment.15Justia. Connecticut Code 12-146 – Delinquent Tax or Installment
A lien attaches to the property automatically when real estate taxes go unpaid. The town can continue that lien by recording a certificate in the land records and, if the balance remains outstanding, file a foreclosure action. A recorded tax lien takes priority over virtually all other claims on the property, including mortgages. If a lien is not continued within two years of the due date the town loses that priority, but a properly maintained lien can remain enforceable for up to 15 years.