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Mortgage Calculator Connecticut
The exact same $400,000 home can owe $3,158 a year in Greenwich or over $20,000 in Hartford — same assessment ratio, wildly different mill rate. This calculator asks where before it does the math.
Estimate your Connecticut mortgage payment
Updates liveIllustrative estimate only. Connecticut has no statewide cap on assessment or bill increases — see below. Not a loan offer or financial advice.
Diagram: nearly $17,600 a year of difference on the exact same home value, purely from which of Connecticut's 169 towns it sits in.
Who checks this calculator
Understanding the Connecticut mortgage market
What makes a Connecticut mortgage different
Every Connecticut town assesses at the same 70% ratio — what varies enormously, town to town, is the mill rate applied on top, and that variation is truly the biggest thing to understand here. This mortgage calculator Connecticut buyers use lets you pick a town instead of guessing at one.
The uniform 70% assessment ratio
Connecticut General Statutes require every one of the state's 169 municipalities to assess real property at exactly 70% of its fair market value — a $500,000 home carries an assessed value of $350,000, and it's that figure the local mill rate is applied to. This part of the system is truly uniform statewide; what happens next is where Connecticut becomes one of the most location-sensitive property tax states in the country. This mortgage calculator Connecticut tool asks you to pick your town for exactly that reason.
Why mill rates vary so dramatically by town
Connecticut abolished county government back in 1960, so there's no intermediate layer between the state and its 169 individual towns and cities — each one employs its own assessor, sets its own mill rate through its Board of Finance or Town Council, and runs its own budget. A mill equals $1 of tax per $1,000 of assessed value. For FY 2025-26, Greenwich set its rate at roughly 11.28-12.041 mills, while Hartford's ran as high as 74.29 mills — meaning an identical $400,000 home's tax bill can swing by close to $17,600 a year purely based on which town it's in.
| Town | FY 2025-26 mill rate | Annual tax on $400K FMV home |
|---|---|---|
| Greenwich | ~11.28 | ~$3,158 |
| Fairfield | ~19.51 | ~$5,463 |
| New Haven | ~43.88 | ~$12,286 |
| Hartford | ~74.29 | ~$20,801 |
No statewide cap on assessment growth
Unlike many states covered elsewhere on this site, Connecticut has no statewide cap limiting how much a property's assessed value, or the resulting tax bill, can increase year to year. There's no Proposition 13-style limit, no percentage growth ceiling — assessed value simply tracks the town's periodic revaluation of fair market value, and mill rates are set fresh each year based on that town's budget needs.
The five-year revaluation cycle
Connecticut towns are required to revalue all real property at least once every five years. Because a full revaluation can show a substantial value jump after five years of market movement, some towns choose to phase in large increases gradually over several years rather than applying the full new value immediately — though this phase-in approach is a town-level choice, not a statewide requirement, so it's worth checking whether your specific town uses one.
The capped motor vehicle tax
Connecticut also taxes registered motor vehicles as property, assessed annually each October 1 at 70% of a standardized depreciated retail value — a real surprise for anyone relocating from a state without one. Unlike the uncapped real estate mill rate, though, state law specifically caps the motor vehicle mill rate at 32.46 mills, regardless of how high a town's general property mill rate runs. In Hartford, where the general rate approaches 69-74 mills, this cap meaningfully protects vehicle owners — without it, a $30,000 car would owe over $2,000 a year instead of roughly $973 at the capped rate.
The Elderly and Disabled Circuit Breaker
Connecticut offers a state-funded property tax credit — the Elderly and Disabled Homeowners' Circuit Breaker — worth up to $1,250 for qualifying homeowners with limited income, applied directly against the local tax bill. Eligibility and the exact benefit amount depend on income and marital status, and it's applied for through the local assessor's office. Veterans exemptions are also available separately for those who qualify.
A worked example, start to finish. Say a buyer purchases a $400,000 home in Greenwich, assessed at 70% ($280,000), with the town's roughly 11.28 mill rate. With a 10% down payment, they're financing $360,000 at 6.6% over 30 years, giving a principal and interest payment of about $2,296. Property tax adds roughly $263 a month (about $3,158 a year), and with typical insurance, the full monthly payment comes to around $2,689.
A different buyer purchasing an identical $400,000 home in Hartford, at the roughly 74.29 mill rate, would see property tax alone jump to about $1,733 a month — nearly $20,800 a year — pushing their full monthly payment well above $4,000, purely because of location, with everything else about the transaction held equal. This is exactly why "what's the property tax in Connecticut" is truly the wrong question — "what's the mill rate in this specific town" is the one that actually matters.
How to use this mortgage calculator Connecticut tool
Enter the home price and down payment you're working with, along with your expected interest rate and loan term. Select the town mill rate closest to your target location, or use the statewide average as a starting point if you're still deciding where to buy. Add an estimated annual insurance premium, and this mortgage calculator Connecticut shows your full estimated monthly payment.
Common mistakes to avoid
- Using a single "Connecticut property tax rate." The mill rate truly determines everything, and it varies enormously by town.
- Comparing towns by mill rate alone without checking assessed value trends. A lower mill rate in a rapidly appreciating town can still mean rising bills.
- Forgetting the separate, capped motor vehicle tax. It's a real annual cost, distinct from real estate tax.
- Assuming a cap exists on assessment growth. Connecticut has none — budget for the possibility of real increases at each revaluation.
- Not checking whether your target town phases in revaluation increases. Some do, some apply the full new value immediately.
Quick glossary
- Mill rate
- The tax rate per $1,000 of assessed value, set independently by each of Connecticut's 169 municipalities.
- 70% assessment ratio
- Connecticut's uniform statewide rule taxing real property at 70% of its fair market value.
- Grand List
- A town's annual listing of all taxable and tax-exempt property, forming the base its mill rate is applied to.
- Revaluation
- A required reassessment of all real property in a Connecticut town, occurring at least once every five years.
- Motor vehicle mill rate cap
- A statutory cap of 32.46 mills limiting how much any town can tax vehicles, regardless of its general property mill rate.
The bottom line
Connecticut's property tax truly comes down to one question above all others: which specific town. The 70% assessment ratio is fixed statewide, but the mill rate applied on top can differ by a factor of six or more between neighboring counties, with no statewide cap limiting how it grows over time. Confirm the exact current mill rate for your target town before finalizing a budget, and this mortgage calculator Connecticut gives you a realistic, location-specific starting point for what a home here actually costs each month.
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