State Guide

How to Appeal Your Property Taxes in Connecticut (2026 Guide)

Published July 12, 2026

If you own a home in Connecticut, your town assessor sets its value, and that number drives your tax bill. Every year you have a window to challenge it — and in Connecticut that window is early, closing in February.

The Connecticut deadline: February 20

Connecticut's appeal goes to your town's Board of Assessment Appeals (BAA), and a written appeal is due by February 20 (Conn. Gen. Stat. §12-111). The board then meets in March to hear appeals. There's one common variation: towns that get an extension to complete the Grand List move the appeal deadline to March 20, with the board's hearings then held in April. The reliable source is your town's assessor — confirm the date and get your written appeal in on time, because missing it generally forfeits the board step for the year.

If the Board of Assessment Appeals doesn't lower your value, you can appeal to Superior Court — generally within two months of the board's notice (§12-117a) — where the case is heard de novo (fresh). Connecticut also provides a separate remedy for a manifestly excessive assessment within one year (§12-119).

How Connecticut assesses your home

Connecticut does not tax your home at 100% of its value. Your assessed value is 70% of market value — the uniform statewide assessment ratio under Conn. Gen. Stat. §12-62a — so a home worth $400,000 carries a $280,000 assessment, and your mill rate is applied to that $280,000. That fraction changes how you read your notice, but not how you win: your appeal contests the underlying market value — the 100% figure — and if you get it lowered, your 70% assessment falls right along with it.

Category	Connecticut
Assessment basis	Assessed value = 70% of market value (§12-62a)
Appeal deadline	February 20 written appeal to the BAA (§12-111); March 20 for late Grand Lists
Where you file	Board of Assessment Appeals → Superior Court (de novo)
Assessment cap	None — value is set at each town's revaluation (at least every 5 years)
Can the board raise your value?	Yes — the BAA can raise or lower; Superior Court is de novo

Connecticut towns revalue at least every five years, and there's no assessment cap holding your value down between revaluations.

Building your case

Because the question is your home's market value, the winning evidence is recent, nearby comparable sales — homes like yours in size, age, and condition — timed close to your town's revaluation date, not necessarily today's market. Three or four solid comps with clear adjustments carry far more weight than a complaint that the number "feels high."

One Connecticut-specific caution: the Board of Assessment Appeals can raise your value as well as lower it on your own appeal, and a Superior Court appeal is heard de novo, so the value can move in either direction there too. File only when your comps clearly support a lower value, and bring your strongest, cleanest set.

Filing at the town level

Connecticut runs assessments and appeals town by town — all 169 municipalities have their own assessor, Board of Assessment Appeals, and revaluation schedule. We're building out town-specific guides with the exact filing office and deadline for each. In the meantime, use PROppeal to pull licensed comparable sales for your address and confirm your town's BAA deadline with the assessor.

Get your case built

You don't need to wait on a town-specific guide to start. PROppeal pulls licensed comparable sales for your address, values your home against Connecticut's market-value standard (then applies the 70% ratio), and gives you a straight answer on whether your assessment is out of line — before February 20 arrives.

Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.