How to Appeal Your Property Tax in Connecticut: Step-by-Step Guide

Connecticut property taxes rank among the highest in the nation, with an average effective rate of 1.63% and mill rates that exceed 40 mills in several cities. If your property tax bill seems inflated, you may have grounds for an appeal. Connecticut’s assessment appeal system gives homeowners multiple levels of review — from the municipal Board of Assessment Appeals through the state Superior Court. The process is free at the local level and doesn’t require a lawyer for the initial filing. Here’s how the system works and how to build a case that actually reduces your bill. If you’re still in the home buying process, understanding how assessments work can also help you evaluate properties before purchase.

How Connecticut Property Taxes Work

Understanding the math behind your bill is essential before filing an appeal. Connecticut property taxes are calculated using three components:

• Assessment ratio: Connecticut assesses property at 70% of fair market value
• Mill rate: Each town sets its own mill rate annually. One mill equals $1 of tax per $1,000 of assessed value
• Tax bill formula: (Fair Market Value × 0.70) × (Mill Rate ÷ 1,000) = Annual Tax

Example: A home with a fair market value of $400,000 in a town with a 30 mill rate would have an assessed value of $280,000 and an annual tax bill of $8,400.

An appeal challenges the assessed value, not the mill rate. You’re arguing that your property’s fair market value is lower than the assessor determined — which would reduce the 70% assessed value and your resulting tax bill. Use our property tax calculator to see how assessment changes affect your annual cost.

Step 1: Understand Connecticut’s Revaluation Cycle

Connecticut law requires each municipality to revalue all property at least once every five years. Some towns conduct revaluations more frequently. The revaluation updates every property’s assessed value to reflect current market conditions. Your assessment notice arrives after a revaluation, showing your new assessed value.

Appeals are most common — and most successful — immediately after a revaluation, when mass-appraisal methods may have produced errors for individual properties. However, you can appeal in any year if you believe your assessment is incorrect.

Timing matters: the appeal window opens on February 1st and closes on February 20th in most Connecticut towns. Some towns with late fiscal year starts may have different deadlines — confirm your town’s dates with the assessor’s office.

Step 2: Review Your Property Card

Before filing, request your property card from the town assessor’s office. This document contains every detail the assessor used to calculate your value: lot size, square footage, number of rooms and bathrooms, construction type, condition grade, and any improvements or additions. Property cards are public records and are increasingly available online through town websites.

Common errors on property cards that justify an appeal:

• Incorrect square footage (measured wrong or including unfinished space)
• Wrong number of bedrooms, bathrooms, or garages
• Inaccurate lot size
• Condition rated too high (e.g., “excellent” when the home needs significant updating)
• Recording a finished basement when it’s unfinished, or counting an enclosed porch as living space
• Missing adjustment for negative factors (proximity to highway, power lines, drainage issues)

Step 3: Gather Comparable Sales Evidence

The strongest appeal evidence is recent sales of similar properties that support a lower value than your assessment. Connecticut assessors use a comparable sales approach, and you can use the same method to argue your case. If you recently purchased your home below its assessed value, the purchase price itself is powerful evidence — use your closing cost documentation to support your claim.

Find 3–5 comparable sales that:

• Sold within the past 12 months (closer to revaluation date is better)
• Are in the same town and similar neighborhood
• Have similar size, age, condition, and lot size
• Sold for less than your assessed fair market value

Connecticut land records are maintained at the town clerk’s office. Sales data is also available through the Connecticut Secretary of the State’s office. Many towns publish recent sales on their assessor’s website. MLS data through a real estate agent can supplement public records.

Step 4: File with the Board of Assessment Appeals

Every Connecticut town has a Board of Assessment Appeals (BAA), consisting of three members appointed by the board of selectmen or town council. Filing is free and does not require a lawyer.

To file your appeal:

1. Obtain the appeal form from your town assessor’s office or website (some towns use the state-standard form, others have custom versions)
2. Complete the form with your property information and the value you believe is correct
3. Attach supporting evidence: comparable sales, property card errors, photographs, appraisals
4. Submit by the February 20th deadline (or your town’s specific date)
5. Attend the hearing when scheduled — usually March through April

At the hearing, you’ll have 10–15 minutes to present your case. The BAA members will ask questions and may refer to their own data. The board can reduce your assessment, leave it unchanged, or (rarely) increase it. You’ll receive a written decision, usually within 30 days of the hearing.

Step 5: Escalate to Superior Court (If Necessary)

If the BAA denies your appeal or the reduction is insufficient, you can file a further appeal with the Connecticut Superior Court within two months of the BAA decision. Court appeals are more formal and typically require:

• A professional appraisal ($300–$600 for residential properties)
• Legal representation (attorney fees of $2,000–$5,000 for a standard case)
• Filing fees ($350)

Court appeals are worth pursuing when the potential tax savings are substantial — generally when the overassessment exceeds $50,000 in value, producing $1,000+ in annual savings. For smaller discrepancies, the cost of a court appeal may exceed the savings. Some tax appeal attorneys work on contingency, taking 25–40% of the first year’s savings as their fee.

Building the Strongest Case

The most successful Connecticut tax appeals combine multiple types of evidence. Start with factual errors on the property card — these are the easiest wins. If the assessor recorded four bedrooms and you have three, or listed 2,400 square feet when you have 2,100, the correction is straightforward and almost always granted.

For market-value arguments, present a professional, organized package. Print a one-page summary showing your current assessment, your proposed value, and the supporting comparable sales in a clear table format. Include photos of your property showing any condition issues the assessor may have overlooked — a deteriorating driveway, aging roof, outdated kitchen, or water damage in the basement. Bring printouts of the comparable sales listing sheets showing the sold prices, property details, and photos.

If your overassessment exceeds $75,000, consider hiring a professional appraiser ($300–$600) to prepare a formal valuation before the BAA hearing. A successful appeal can save you thousands annually — use our mortgage calculator to see how reduced property taxes affect your total monthly housing cost. An independent appraisal from a Connecticut-certified appraiser carries significant weight with the board, particularly when it contradicts the municipal revaluation company’s mass-appraisal methodology. The appraisal cost is easily justified if it produces a reduction saving $1,000+ annually.

What Reduces Your Chances

Certain arguments consistently fail in Connecticut assessment appeals:

• “My taxes are too high”: The appeal is about assessed value, not the mill rate or total tax bill. The BAA has no control over the mill rate
• “My neighbor pays less”: Different homes have different values. Your neighbor’s lower assessment may be correct for their property
• “I can’t afford it”: Financial hardship doesn’t affect assessed value. However, Connecticut offers tax deferrals for seniors and disabled residents — contact your assessor’s office
• Using Zillow or similar estimates: BAAs give little weight to automated valuation models. Use actual sales data

Available Exemptions and Relief Programs

Connecticut offers several programs that may reduce your property tax burden without an appeal:

These programs are applied through the assessor’s office, not through the BAA. Application deadlines vary but most fall between February 1 and May 15. Our mortgage calculator can help you model how exemptions affect your total monthly housing cost.

Compare With Other States

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

• How to Appeal Your Property Tax in Missouri: Step-by-Step Guide
• How to Appeal Your Property Tax in Michigan: Step-by-Step Guide
• How to Appeal Your Property Tax in North Carolina: Step-by-Step Guide

Frequently Asked Questions

How often can I appeal my property tax in Connecticut?

You can file an appeal every year, but it’s most productive in a revaluation year or when you have new evidence of a value change (recent sale of your property below assessed value, damage, environmental issues, etc.). Filing every year without new evidence will frustrate the BAA and reduce your credibility. Most homeowners who successfully appeal do so once — immediately after a revaluation — and the correction holds until the next revaluation cycle.

Will my taxes go up if I appeal and lose?

In theory, the BAA can increase your assessment, but this almost never happens in practice. The BAA’s function is to correct errors, not to raise assessments proactively. Filing an appeal does not flag your property for increased scrutiny. However, if you present evidence during the hearing that your property is worth more than assessed — for example, disclosing recent renovations the assessor didn’t know about — you could inadvertently provide grounds for an increase.

Do I need a lawyer for a property tax appeal?

Not for the Board of Assessment Appeals — the local hearing is designed for homeowners to represent themselves, and most appellants do so successfully. The hearing is informal, and the board members expect non-lawyers. For a Superior Court appeal, legal representation is strongly recommended. The court process follows formal legal procedures, requires proper evidence presentation, and benefits from an attorney experienced in Connecticut property tax law. Some attorneys handle residential appeals on contingency.

What’s the success rate for Connecticut property tax appeals?

Success rates vary by town, but statewide data suggests that approximately 30–40% of BAA appeals result in some reduction. The average reduction, when granted, is 5–15% of assessed value. Success depends entirely on the quality of evidence. Appeals based on factual errors (wrong square footage, incorrect room count) have very high success rates. Appeals based on disagreement about market value require strong comparable sales data to succeed. Check your home’s assessment against recent sales using our property tax calculator as a starting point. You can also use our affordability calculator to see how a successful assessment reduction would improve your monthly housing budget, and our mortgage calculator to model the impact of lower escrow payments on your total monthly cost.

Can I appeal a property tax increase caused by renovations?

Renovations that add living space (additions, finished basements, added bathrooms) will legitimately increase your assessed value and are difficult to appeal. Use our renovation ROI calculator for detailed numbers. However, you can appeal if the value added by the assessor seems excessive. A $30,000 kitchen renovation should not add $30,000 to your assessed value — kitchens depreciate and rarely return full cost. If your assessor added the full renovation cost to your assessment, comparable sales evidence showing actual value added may support a reduction. Cosmetic updates (painting, landscaping, new appliances) should not trigger reassessment at all, and if they did, you have grounds for appeal.