What’s in This Article
Key Takeaways
- Connecticut towns revalue real property on a five-year cycle, and every town uses an assessment date of October 1.
- Property is assessed at 70 percent of present true and actual value by statute. That ratio is uniform statewide.
- Since October 1, 2023 the schedule runs through five revaluation zones built on planning region boundaries, so neighboring towns revalue in different years.
- A revaluation does not raise your taxes by itself. It redistributes them. Whether your bill rises depends on how your building moved relative to everything else in town.
- On a commercial property, the lease decides who absorbs the change, and a phase-in can stretch an increase across up to five assessment years.
Ask a commercial tenant what their rent is and you get a number. Ask what their occupancy cost is and it gets vaguer, because a large piece of it is the property tax line, and that line is set by a process most occupiers never look at until it moves.
It is worth looking at, because in Connecticut it moves on a schedule you can see coming years in advance.
What Revaluation Actually Is
The statute is unusually plain about this. Under Section 12-62 of the general statutes, to revalue means “to establish the present true and actual value of all real property in a town as of a specific assessment date.”
Note what that does not say. It says nothing about raising revenue. A revaluation resets values; the mill rate is set separately, by the town, against the budget it needs. Those are two different levers pulled by two different processes, and conflating them is the single most common misreading of a tax bill.
The Four Numbers That Run It
| Element | Rule | Statute |
|---|---|---|
| Assessment date | October 1, uniform for every municipality | Sec 12-62a(a) |
| Assessment ratio | 70 percent of present true and actual value | Sec 12-62a(b) |
| Cycle | Every five years | Sec 12-62(b) |
| Schedule | Set by OPM for each of five revaluation zones | Sec 12-62(b)(1)(B) |
The 70 percent ratio is the one worth committing to memory, because it is uniform and it is statutory. Each municipality “shall assess all property for purposes of the local property tax at a uniform rate of seventy per cent of present true and actual value.” So an assessment of $1.4 million implies a market value opinion of $2 million, and a building you believe is worth $2 million carrying a $1.75 million assessment is being valued at $2.5 million by the town.
That conversion is the first thing to do with any assessment figure. Divide by 0.7 and you have the town’s opinion of value in terms you can actually argue with, because it is now comparable to a sale price or an appraisal.
Once a revaluation is effective, the statute says the town uses those assessments “for the purpose of levying property taxes for the assessment year in which such revaluation is effective and for each assessment year that follows until the ensuing revaluation becomes effective.” In other words, the number sticks for five years. Getting it wrong is not a one-year problem.
Why Your Town and the Next Town Revalue in Different Years
This is the piece that surprises people who own in more than one town.
Commencing October 1, 2023, the schedule changed shape. Rather than each town simply counting five years from its own last revaluation, towns now revalue “in accordance with a revaluation date schedule prescribed by the secretary for each revaluation zone.” A revaluation zone is defined as “one of five geographic areas in the state established by the secretary utilizing the boundaries of the planning regions,” and the secretary here is the Secretary of the Office of Policy and Management.
So Connecticut is organized into five revaluation zones drawn on planning region lines, and OPM prescribes when each zone goes. The practical consequences for anyone comparing properties across a market:
What the zone structure means in practice
- Two similar buildings in adjacent towns can carry assessments set years apart, against different market conditions. Comparing their assessments directly tells you very little.
- An assessment set at the bottom of a cycle looks like a bargain until the town revalues. That is a timing risk on any acquisition, and it is knowable in advance.
- If you own in several towns, you have several clocks, not one. Worth having the dates written down.
- Planning regions replaced counties for administrative purposes in Connecticut, which is why the zones follow region lines rather than the county names everyone still uses.
Your assessor’s office will tell you the town’s next revaluation date, and OPM prescribes the schedule. That is a two-minute phone call that can reframe an underwriting.
Property Revaluation Meets the Lease
Here is where this stops being a tax topic and becomes a real estate one. A revaluation changes a cost. Which party that cost lands on is a question the lease already answered, possibly years ago.
| Structure | Who feels it |
|---|---|
| Triple net | The tenant, directly. Taxes are a tenant obligation, so the increase passes through |
| Double net | The tenant, since taxes and insurance are the two nets being paid |
| Gross or full service | The landlord, unless a tax escalation or stop clause shifts the increase above a base year |
| Modified gross | Whatever the document says. This is where the argument happens |
If you are a tenant in a net lease, a revaluation is a rent increase that does not appear in the rent clause. If you are a landlord in a gross lease with no escalation, it is a margin cut you cannot bill for. Neither party gets to renegotiate because the assessor did their job.
Two clauses decide most of it. A base year fixes the landlord’s share at the taxes in a stated year and passes increases above it to the tenant, which means a base year set in the last year of an old assessment cycle is a bad base year for a tenant. A tax stop caps the landlord’s exposure at a dollar figure per square foot, and everything above flows through. If you are signing in the year or two before a known revaluation, both of those deserve more attention than the free rent.
For how these structures differ generally, see gross lease versus net lease and what NNN actually means. This is also the third cost line we have written about that a tenant often does not see coming, after the Eversource public benefits charge.
The Phase-In Option, and Its Limits
Towns have a statutory tool to soften a revaluation, and it has hard edges worth knowing.
Under Section 12-62c, a town implementing a revaluation may phase in an assessment increase, or a portion of one. The decision, the method, and the term all have to be approved by the town’s legislative body. Two limits matter:
The statutory boundaries on a phase-in
- Five years maximum. The number of assessment years over which the increases are reflected “shall not exceed five assessment years, including the assessment year for which the revaluation is effective.”
- A minimum factor. A town phasing in a portion of the increase sets a factor of not less than 25 percent for assessment years commencing before October 1, 2024, or not less than 20 percent for years commencing on or after that date.
- No carve-outs by property type. The factor applies to increases “for all parcels of real property, regardless of property classification.” A town cannot phase in residential increases and let commercial land all at once.
That last clause is the useful one for a commercial owner. Whatever relief a town grants, it grants across classifications. So if you hear that a town is phasing in a revaluation, that applies to your building too.
A phase-in also means the increase is still coming, just in installments. On a five-year lease signed in a phase-in year, the tax line is scheduled to rise every year of the term. That is forecastable, and it belongs in the pro forma rather than in a surprise.
They Cannot Come Inside Without Permission
One procedural point that owners routinely get wrong in both directions.
The statute distinguishes a field review, where an assessor examines a parcel in its neighborhood setting and compares observable attributes against the property record, from a full inspection, which means measuring or verifying exterior dimensions and entering to examine the interior. The definition of a full inspection carries a condition: “provided permission to enter such interior is granted by the property owner or an adult occupant.”
So interior access is by permission. That is not a license to stonewall, and refusing has consequences, because an assessor working without interior information will value the building on what they can observe and on the record they have. If your building has functional obsolescence, deferred capital needs, or an interior that is materially worse than the exterior suggests, letting them in is usually the argument in your favor. If it has been renovated to a standard the record does not reflect, that is a different calculation, and one to make with your counsel rather than at the door.
What to Do Before Your Town’s Next One
Find out when your town revalues
Call the assessor. Because the schedule is set by zone rather than by each town independently, do not assume your town moves in the same year as the town next door.
Convert every assessment to a value opinion
Divide the assessment by 0.7. That is the town’s opinion of market value, and it is the only form in which you can compare it to a sale, an appraisal, or your own numbers.
Read the tax clause in every lease you are party to
Find the base year, the tax stop, and the pass-through language. Do that before the revaluation, not after the bill arrives, because that is when the language still reads as neutral rather than as a dispute.
Assemble the case for your building specifically
Income and expenses, vacancy history, deferred capital, functional issues, and comparable sales. An assessment argument is an argument about one property, and the town has to be given something specific to work with.
Calendar the appeal window
Appeals run to the board of assessment appeals on a statutory calendar that does not wait for you. Miss it and the number stands for the cycle.
Property Revaluation Coming in Your Town?
Commercial Connection works with Connecticut owners and tenants on what a building is actually worth, what the assessment implies, and how the lease allocates the cost. Licensed in CT and MA, established 2001.
Talk to us about your property
Or read how to negotiate a commercial lease, closing costs in Connecticut, or browse commercial real estate across Connecticut.
Frequently Asked Questions
How often does Connecticut revalue property?
Every five years. Under Section 12-62 of the general statutes a town implements a revaluation not later than the first day of October that follows, by five years, the applicable October first assessment date. Since October 1, 2023 the timing runs through a schedule prescribed by the Secretary of the Office of Policy and Management for each of five revaluation zones, which are geographic areas built on planning region boundaries. Your assessor can confirm your town’s next date.
What is the assessment ratio in Connecticut?
Seventy percent. Section 12-62a requires each municipality to assess all property for local property tax purposes at a uniform rate of seventy per cent of present true and actual value, with a uniform assessment date of October first. To read an assessment as a value opinion, divide it by 0.7.
Does a revaluation mean my property taxes go up?
Not by itself. Revaluation resets assessed values; the mill rate is set separately against the town’s budget. In aggregate a revaluation is close to revenue-neutral, so bills move because individual properties move differently from the town average. If your building rose less than the average, your bill can fall even though your assessment rose.
Who pays a revaluation increase, the landlord or the tenant?
The lease decides. Under a triple net or double net lease taxes are a tenant obligation, so the increase passes through to the tenant. Under a gross or full service lease the landlord absorbs it unless a tax escalation clause, base year, or tax stop shifts increases above a threshold. Modified gross depends entirely on the wording. Read our comparison of gross versus net lease structures.
Can a town spread a revaluation increase over several years?
Yes. Section 12-62c lets a town phase in an assessment increase or a portion of it, subject to approval by the town’s legislative body. The phase-in cannot exceed five assessment years including the year the revaluation is effective, and a town phasing in a portion must apply a factor of at least 20 percent for assessment years commencing on or after October 1, 2024. Importantly, the factor applies to all parcels regardless of property classification, so commercial property receives the same treatment as residential.
Does the assessor have to come inside my building?
They cannot without permission. The statutory definition of a full inspection includes entering and examining the interior, “provided permission to enter such interior is granted by the property owner or an adult occupant.” A field review, by contrast, works from observable attributes and the existing property record. If your building is in worse condition than it looks from the street, granting access is often the argument in your favor.
Sources and Further Reading
Primary sources
- Chapter 203 of the Connecticut General Statutes, property tax assessment
- Sec 12-62, revaluation of real property, including the definitions of revaluation, revaluation zone, field review, and full inspection, and the five-year cycle
- Sec 12-62a, the uniform October 1 assessment date and the 70 percent assessment ratio
- Sec 12-62c, the municipal option to phase in assessment increases
- Connecticut Office of Policy and Management, which prescribes the revaluation date schedule by zone
Related reading on this site
- The Eversource public benefits charge and who pays on a CT lease
- What does NNN mean? Triple net leases explained
- Gross lease vs net lease, every type compared
- How to negotiate a commercial lease
This article provides general commercial real estate information, not legal, tax, appraisal, accounting, or investment advice. Statutes are quoted as they read at the time of writing and are subject to amendment. Assessment practice, revaluation timing, phase-in decisions, and appeal deadlines vary by municipality. Confirm your town’s revaluation date and appeal calendar with its assessor, and review lease language with counsel. Information current as of September 21, 2026.
