Connecticut property tax is set locally: each of the state’s 169 municipalities picks its own mill rate and applies it to an assessment equal to 70% of your property’s fair market value. Bills go out in two installments, due July 1 and January 1, with a one-month grace period on each. Beyond real estate, towns also tax motor vehicles and business personal property, and several exemption programs can reduce what you owe if you apply on time.
How Your Tax Bill Is Calculated
One mill equals $1 of tax for every $1,000 of assessed value. If your home is assessed at $200,000 and your town’s mill rate is 30, your annual tax is $6,000.1Connecticut General Assembly. Special Taxing Districts
Assessed value is always 70% of fair market value.2Justia. Connecticut Code Title 12 Chapter 203 – Section 12-62a – Uniform Assessment Rate The mill rate is what changes each year. Towns set it during the annual budget cycle, adding up planned spending on schools, public safety, and roads, then subtracting state aid and fees. Whatever’s left has to come from property owners. Public hearings precede the final vote.
Cities with heavier service demands and less taxable property generally carry higher mill rates than wealthier suburbs. Some municipalities also have special taxing districts that add mills for fire protection, sewer service, or street lighting on top of the town-wide rate.1Connecticut General Assembly. Special Taxing Districts
When Payments Are Due
Most Connecticut municipalities bill real estate and personal property taxes in two installments. The first is due July 1, the second January 1. Each has a one-month grace period: pay by August 1 or February 1 and there’s no penalty.3State of Connecticut Office of Policy and Management. Statutes Governing Property Assessment and Taxation Bills under $100 are usually due in a single payment on July 1.
A payment counts as timely if it’s postmarked before the grace period ends, or submitted through the municipality’s electronic system by that date.
What Happens If You Pay Late
Miss the grace period by even one day and interest is charged retroactively to the original due date. The rate is 1.5% per month, and any fraction of a month counts as a full month.4Justia. Connecticut Code Title 12 Chapter 204 – Section 12-146 – Delinquent Tax or Installment, Interest, Waiver of Interest
An example: taxes were due July 1 and you pay August 2, one day past the grace period. You owe interest for both July and August, or 3% of the delinquent balance. Wait until October and you’re at 6%. The annualized rate is 18%.3State of Connecticut Office of Policy and Management. Statutes Governing Property Assessment and Taxation
Municipalities generally cannot waive this interest. The only statutory exception is for taxpayers who received compensation as crime victims.4Justia. Connecticut Code Title 12 Chapter 204 – Section 12-146 – Delinquent Tax or Installment, Interest, Waiver of Interest Tax collectors can also add lien recording fees, demand notice fees, and collection costs.
Cars and Business Equipment Are Taxed Too
Connecticut’s property tax reaches beyond real estate. Motor vehicles and business personal property are separately assessed by your town.
Motor Vehicles
Your vehicle is valued at 70% of a depreciated figure based on the manufacturer’s suggested retail price and the vehicle’s age. Vehicles 20 years or older get a minimum valuation of $500.5Connecticut General Assembly. Personal Motor Vehicle Property Tax Assessments and Rates
Motor vehicle taxes use the October 1 assessment date and are generally due July 1. Register a vehicle after October 1 but before August 1 and you’ll get a supplemental bill covering the remaining months of the assessment year. Supplemental bills are due January 1 and must be paid by February 1 to avoid interest.6Town of Newington. Supplemental Motor Vehicle Tax Information
Business Personal Property
If you own business equipment, furniture, fixtures, or other tangible personal property in Connecticut, you must file a Declaration of Personal Property with your local assessor each year between October 1 and November 1. Miss the deadline and a 25% penalty is added to your assessment, which the assessor will estimate on their own.7Town of Southbury. Personal Property Filing You file even if you think your property isn’t taxable or hasn’t changed from the prior year.
Exemptions and Credits That Lower Your Bill
Several state and local programs reduce assessments or apply direct credits. Deadlines matter: miss one and you generally wait a full year for the next window.
Veterans
Honorably discharged veterans who served at least 90 days during wartime qualify for a basic $1,000 exemption off assessed value. The discharge paperwork has to be recorded in the land records of the veteran’s town of residence before October 1 of the assessment year.8State of Connecticut Office of Policy and Management. Additional Veterans Tax Relief Program
Income-qualified veterans can receive an additional state exemption worth up to 200% of their local exemption. Disabled veterans receive higher exemptions based on disability severity, and many towns add local-option exemptions on top of the state minimums. Income-qualified applicants file with the local assessor between February 1 and October 1 and must reapply every two years.8State of Connecticut Office of Policy and Management. Additional Veterans Tax Relief Program
Elderly and Disabled Homeowners
The Circuit Breaker Program provides a direct credit for homeowners aged 65 or older or permanently disabled, whose income falls below limits set annually by the Office of Policy and Management. The credit reaches up to $1,250 for married couples and $1,000 for single applicants on a graduated income scale.9State of Connecticut Office of Policy and Management. Homeowners Elderly/Disabled Circuit Breaker Tax Relief Program
Applications are filed in person with the local assessor between February 1 and May 15. Reapplication is required every two years. Surviving spouses aged at least 50 who were living with the qualifying homeowner at death can also apply.10Connecticut General Assembly. Circuit Breaker Program
Renters’ Rebate
Renters can also qualify for relief, since rent effectively covers a portion of the landlord’s property tax. The Renters’ Rebate Program pays cash rebates to renters who are 65 or older, permanently disabled, or a surviving spouse aged 50 or older of a prior qualifier. Applicants must have lived in Connecticut for at least a year before applying.
For the 2026 processing year, qualifying 2025 income cannot exceed $46,300 unmarried or $56,500 married. Applications are filed with the local assessor between May 15 and September 15, with current proof of disability for applicants under 65.11State of Connecticut Office of Policy and Management. Renters Tax Relief Program Question and Answer Booklet 2026
Solar Installations
Solar energy systems on residential and commercial properties can qualify for an exemption, meaning the added value from the installation won’t raise your assessment. State regulations set the qualifying-system requirements.12Cornell Law Institute. Conn. Agencies Regs. 16a-14-4 – Eligibility of Solar Energy Systems for Exemption
Farmland, Forest, and Open Space (PA 490)
Public Act 490 lets qualifying farmland, forestland, and designated open space be assessed at current-use value instead of development value. A 50-acre farm that could be subdivided into house lots might carry a development value of $2 million and a current-use value of $50,000; PA 490 taxes it at the lower figure.13State of Connecticut. Clarifying Information on PA 490 Recommended Land Use Values In early 2026, Governor Lamont directed the Office of Policy and Management to reinstate 2020 recommended land-use values after proposed increases raised concerns higher assessments could force landowners to sell.14State of Connecticut. Governor Lamont Acts to Protect Connecticut Farmland and Open Space From Rising Tax Assessments
Revaluations and How to Appeal Your Assessment
Every municipality must revalue all real property at least once every five years, on a schedule coordinated by the Office of Policy and Management.15Justia. Connecticut Code Title 12 Chapter 203 – Section 12-62 – Revaluation of Real Property Revaluations combine property inspections, statistical analysis, and recent sales data. Your new assessed value is set at 70% of the resulting fair market value. If the market has risen, so will your assessment, and your bill will follow unless the town lowers the mill rate. Some municipalities phase in large increases over multiple years.
Once you receive an updated notice, you can request an informal review with the assessor’s office. Bring an independent appraisal or comparable recent sales. If the assessor won’t adjust, you move to a formal appeal.
Board of Assessment Appeals
The first formal step is a written appeal to your local Board of Assessment Appeals, filed no later than February 20. The board hears appeals in March on the Grand List filed by the assessor on January 31.16Connecticut General Assembly. Deadline for Property Tax Assessment Appeal Present your evidence at the hearing. The board can adjust your assessed value but cannot change the mill rate or waive interest on past-due taxes.
Superior Court
If the board denies your appeal or the adjustment falls short, you can sue in Connecticut Superior Court within two months of the decision. You’ll need to show the assessment was excessive or that improper valuation methods were used.16Connecticut General Assembly. Deadline for Property Tax Assessment Appeal A separate path lets you bypass the board and go directly to Superior Court within one year of the assessment date, but only if you can show the property was taxed in the wrong municipality or that the assessment was so excessive it could only have come from ignoring the law.
Refunds for Overpayments
If you’ve overpaid due to an assessment error, a successful appeal, or a duplicate payment, apply in writing to the tax collector for a refund. The deadline is the later of three years after the tax was due, or 90 days after a court order removes the assessment, an audit uncovers the error, or the Board of Assessment Appeals reduces your value. If you also carry delinquent taxes, the town can apply the overpayment to that unpaid balance first.17Connecticut General Assembly. Refunding Property Tax Overpayments
When Unpaid Taxes Lead to Liens, Sales, and Foreclosure
When taxes go unpaid well past the due date, towns move from penalties to active collection. The escalation runs from liens to tax sales to foreclosure.
Tax Liens
A tax collector can file a lien in the land records securing the town’s claim ahead of other creditors. The lien must be filed within two years of the assessment date and remains effective for 15 years unless discharged.18Justia. Connecticut Code Title 12 Chapter 205 – Section 12-195d – Effective Period of Lien, Limitation Period A property with an active tax lien can’t be cleanly sold or refinanced. Municipalities can also assign liens to private investors, who then collect the debt plus interest and fees.
Tax Sales
Municipalities can auction properties with delinquent taxes. The tax collector must give advance written notice to the delinquent taxpayer and all recorded lienholders and post the details at the time and place of sale.19Justia. Connecticut Code Title 12 Chapter 204 – Section 12-157 – Sale of Real Property to Enforce Tax Lien With no bidders or bids too low, the town itself can buy the property.
After the auction, the deed sits with the town clerk but stays unrecorded for six months. During that window, the original owner continues to occupy the property and can redeem it by paying the full delinquency plus interest on the winning bid at 1.5% per month and any additional costs. After six months, ownership transfers and redemption ends. For abandoned properties, the redemption period may be as short as 60 days.20Connecticut General Assembly. Tax Sales of Abandoned Property
Judicial Foreclosure
The strongest tool is a foreclosure action in Connecticut Superior Court. The town or lien assignee petitions the court to foreclose on the tax lien, and the court sets a redemption deadline called a “law day.” Miss it and all rights to the property are extinguished.21Justia. Connecticut Code Title 12 Chapter 205 – Section 12-189 – Right of Redemption Unlike a tax sale, there’s no six-month waiting period after the law day. Once it passes, ownership shifts permanently.
Improperly conducted sales or foreclosures can be challenged. Connecticut courts have consistently held that municipalities must follow every procedural step in the statute when enforcing tax collections, and missed notices, improper publication, or skipped timeline steps can be grounds to invalidate a sale.