Property Tax in Connecticut: Mill Rates, Revaluation, and What Homeowners Pay

Connecticut has some of the highest property taxes in the United States. The average effective rate of 1.63% exceeds the national average of 0.99%, and individual towns range from 11.59 mills in Greenwich to over 74 mills in Hartford. Unlike most states where property taxes are set at the county level, Connecticut’s 169 municipalities each set their own mill rates independently. This produces enormous variation — two homes of identical value in adjacent towns can generate annual tax bills that differ by $5,000 or more. Understanding how the system works is essential before buying a home in Connecticut.

How Connecticut Property Tax Is Calculated

Connecticut property tax involves three components that multiply together to produce your bill:

1. Fair Market Value: The assessor’s estimate of what your property would sell for on the open market
2. Assessment Ratio: Connecticut uses a 70% assessment ratio statewide — your assessed value is 70% of fair market value
3. Mill Rate: The tax rate set by your town’s legislative body (town meeting, city council, or board of aldermen). One mill equals $1 per $1,000 of assessed value

Formula: Fair Market Value × 0.70 × (Mill Rate ÷ 1,000) = Annual Property Tax

Example: A $400,000 home in Stamford (mill rate 25.28):

• Assessed value: $400,000 × 0.70 = $280,000
• Tax: $280,000 × 0.02528 = $7,078 per year

The same $400,000 home in Hartford (mill rate 74.29):

• Assessed value: $400,000 × 0.70 = $280,000
• Tax: $280,000 × 0.07429 = $20,801 per year

That’s a $13,723 annual difference on the same-value home. This is why town selection matters as much as home selection in Connecticut. Model your specific scenario with our property tax calculator.

Mill Rates by Town

The pattern is clear: wealthy towns with high property values have low mill rates, while cities with lower property values and greater service demands have high mill rates. Greenwich collects roughly the same total revenue as Hartford despite having one-sixth the mill rate — because the total assessed property value in Greenwich is dramatically higher.

Why Connecticut Property Taxes Are So High

Several structural factors drive Connecticut’s elevated property taxes:

No County Government

Connecticut abolished county government in 1960. Each of the state’s 169 municipalities funds its own schools, police, fire departments, road maintenance, and public services independently. This means no cost-sharing across towns for common services. A small town of 5,000 residents bears the full cost of running a school system, maintaining roads, and staffing emergency services — costs that would be spread across a larger tax base in states with county-level government.

Education Spending

School budgets consume 60–70% of municipal property tax revenue in most Connecticut towns. Connecticut spends an average of $21,500 per pupil — the fifth-highest in the nation. While this spending produces top-ranked schools (Connecticut consistently ranks in the top 5 states for K-12 education), it places enormous pressure on the property tax base. Towns with fewer students per household (wealthy suburbs) spread this cost more efficiently than cities with high concentrations of school-age children and lower property values.

Tax-Exempt Property

In cities like Hartford, New Haven, and New London, major institutions — state government buildings, universities (Yale’s campus alone covers 310 acres in New Haven), hospitals, and nonprofits — are exempt from property taxes. These exempt properties consume city services (roads, police, fire) without contributing to the tax base. Connecticut’s Payment in Lieu of Taxes (PILOT) program reimburses municipalities for some exempt property, but the state has historically funded PILOT at only 35–45% of the statutory formula, leaving cities chronically underfunded.

Revaluation Cycles

Connecticut law requires every municipality to conduct a full property revaluation at least every five years. During a revaluation, every property in town is reassessed to reflect current market values. The process is conducted by the town assessor, often with assistance from a private revaluation company.

Key facts about Connecticut revaluations:

• The revaluation changes individual assessments but is revenue-neutral by design — the town adjusts the mill rate to collect the same total revenue
• Your tax may go up or down depending on whether your property appreciated faster or slower than the town average
• Assessment notices are sent 30 days before the new Grand List takes effect
• The Grand List (the official roll of all assessed property values) is finalized on October 1 each year
• Appeals must be filed with the Board of Assessment Appeals, typically by February 20

Physical revaluations have increasingly been supplemented by statistical revaluations (using sales data modeling rather than individual property inspections). Statistical revaluations are permitted under Connecticut law and are less expensive for municipalities, but can produce less accurate individual assessments.

Property Tax Exemptions and Credits

How Property Taxes Affect Home Buying

For buyers using a mortgage calculator to determine affordability, property taxes are a critical variable. Lenders include property taxes in your PITI (principal, interest, taxes, insurance) calculation when determining your debt-to-income ratio. A high mill rate can disqualify you from a home that would be affordable based on purchase price alone.

Consider this comparison: a buyer approved for $2,800/month PITI has very different purchasing power depending on the town:

The same buyer can afford $175,000 more home in Greenwich than in Hartford, despite Greenwich being the more expensive market. Use our affordability calculator and DTI calculator to model these tradeoffs for your income level.

Paying Your Property Tax

Connecticut property taxes are typically billed in two installments: July 1 and January 1. Some towns offer quarterly billing. Payments are due 30 days after the billing date. Late payments incur interest at 1.5% per month (18% annual rate) — among the highest delinquency rates in the country. Property tax liens take priority over all other liens except federal tax liens, and persistent nonpayment can result in tax sale of the property.

Homeowners with mortgages typically have property taxes escrowed — the lender collects monthly tax payments as part of the mortgage payment and pays the town directly. Use our amortization schedule calculator for detailed numbers. If you own your home free and clear, you’re responsible for making direct payments to the tax collector.

Motor Vehicle Tax

Connecticut also levies a property tax on motor vehicles — a cost that surprises transplants from states without this tax. Each town assesses registered vehicles at 70% of NADA average retail value and applies its mill rate. The state caps the motor vehicle mill rate at 45 mills (even if the town’s real property rate is higher), which limits the tax on vehicles in high-mill-rate cities. On a car valued at $30,000 in a 30-mill town, the annual tax is roughly $630. In a 45-mill-capped city, it’s approximately $945. This tax is billed annually, typically in July, and is separate from your real property tax bill. Late payment triggers the same 1.5% monthly interest as delinquent real property taxes, and unpaid vehicle taxes can result in registration renewal denial by the DMV.

The motor vehicle tax adds $400–$1,200 per vehicle per year to the cost of living in Connecticut. Households with two or three vehicles can face a combined vehicle tax bill exceeding $2,000 annually. This is a cost that belongs in your total housing budget alongside mortgage, property tax, and insurance. Use our mortgage calculator to model your overall monthly obligations.

Compare With Other States

Considering other markets? Here’s how other states compare:

• New Jersey Property Tax System Explained: What Homebuyers Need to Know
• Property Tax in Utah: Rates, Exemptions, and What Homeowners Actually Pay
• Indiana Property Tax System Explained: What Homebuyers Need to Know

Frequently Asked Questions

Why is Greenwich’s mill rate so low?

Greenwich’s 11.59 mill rate — the lowest in Connecticut — reflects the town’s enormous property wealth. The total assessed value of all property in Greenwich is approximately $25 billion. A low rate applied to that massive base generates sufficient revenue to fund town services, including schools. Greenwich also benefits from having relatively few tax-exempt properties compared to cities like Hartford and New Haven. The low mill rate doesn’t mean low taxes in dollar terms — on Greenwich’s median home of $2.35 million, the annual tax bill is approximately $19,050.

Can I deduct Connecticut property taxes on my federal return?

Yes, but the federal Tax Cuts and Jobs Act capped the state and local tax (SALT) deduction at $10,000 per year ($5,000 for married filing separately). For many Connecticut homeowners — particularly those in towns with high mill rates or high home values — property taxes alone exceed the $10,000 cap, meaning a significant portion of your state and local taxes generates no federal deduction. This SALT cap disproportionately affects high-tax states like Connecticut and has been a political issue since its 2018 implementation.

Do property taxes affect home values?

Absolutely. Towns with lower mill rates tend to see higher home values, partly because buyers can afford more home when taxes consume less of their monthly budget. Research consistently shows an inverse relationship between mill rates and home prices in Connecticut. A town that reduces its mill rate by 2 mills typically sees home values increase by 1–3% over the following two years, as buyers factor the lower carrying cost into their willingness to pay. This dynamic reinforces the disparity between wealthy low-tax towns and struggling high-tax cities.

What happens if I don’t pay my property taxes?

Connecticut charges 1.5% monthly interest (18% per year) on delinquent property taxes, accruing from the original due date. After one year of nonpayment, the town can place a tax lien on the property, which takes priority over mortgage liens. After sustained nonpayment, the town can initiate a tax sale — a public auction of the tax lien. The purchaser of the lien pays the back taxes and earns the 18% interest rate. If the homeowner doesn’t redeem (pay back the lien plus interest) within six months, the lien purchaser can foreclose on the property. This is a rare but real outcome for persistent nonpayment.

How do I find a town’s current mill rate?

Each town publishes its mill rate annually, usually in May or June when the budget is adopted. The Connecticut Office of Policy and Management (OPM) publishes a statewide mill rate list each year. Your town’s website, assessor’s office, or tax collector’s office will have the current rate. When comparing towns, make sure you’re comparing the same fiscal year — Connecticut towns operate on a July 1–June 30 fiscal year, and mill rates can change annually. Our property tax calculator uses current rates for Connecticut towns. You can also use our mortgage calculator to see how property tax escrow affects your total monthly payment at different mill rates across the state.