Decoupled from §168(k) & §168(n)
Connecticut Requires Bonus Depreciation Addback
6.99% Top Individual · 7.5% Corporate (+10% Surtax)
Federal Deduction Amplified
22–35% Typical Reclassification
Connecticut Building Value into Short-Life Assets
All Commercial Asset Classes
Statewide Connecticut
The Basics
What Cost Segregation Does for Connecticut Property Owners
A cost segregation study identifies building components, HVAC systems, specialty flooring, parking surfaces, interior finishes, exterior lighting , that qualify for accelerated depreciation on 5-, 7-, or 15-year schedules rather than the default 27.5-year (residential rental) or 39-year (commercial) building schedule. Front-loading those deductions increases first-year cash flow and lowers current-year federal taxable income.
In Connecticut, the federal benefit works the same way it does anywhere, the One Big Beautiful Bill (OBBBA, P.L. 119-21) permanently restored 100% bonus depreciation for qualified property placed in service after January 19, 2025, and that federal benefit applies to Connecticut properties in full. State-level treatment is where Connecticut is different: Connecticut is decoupled from federal §168(k) bonus depreciation (Conn. Gen. Stat. §12-217(b)) and, as of the 2026 regular session, is also decoupled from §168(n) qualified production property (Conn. Public Act 26-68 §265, effective May 26, 2026). Federal bonus depreciation must be added back on the Connecticut corporate return, and property depreciates via regular MACRS on the state return. The state benefit from a cost seg study still exists, reclassification to shorter MACRS lives, but there’s no state-level bonus stacking.
Federal Benefit Amplified by CT’s High Marginal Rate
Connecticut’s Tax Landscape: Why Cost Segregation Matters Here
Individual Income Tax
Graduated 2% to 6.99%, higher-earning owners feel every federal deduction more sharply, given the combined federal + Connecticut effective rate.
Corporate Income Tax
7.5% baseline. Corporations with $100M+ gross proceeds (or those filing as part of a combined unitary group) pay an additional 10% surtax, extended through 2028. Connecticut also imposes a minimum tax based on capital stock.
Pass-Through Entity Tax (PET)
Connecticut has a PET regime pass-through entities can elect for federal SALT-cap workaround purposes. Talk to your CPA about whether it fits.
Bonus Depreciation Conformity
Decoupled. Connecticut has long disallowed federal §168(k) bonus depreciation for corporate business tax filers (Conn. Gen. Stat. §12-217(b)). As of May 26, 2026, Connecticut also decouples from §168(n) qualified production property (Conn. Public Act 26-68 §265). Federal bonus depreciation is added back on the CT corporate return; property depreciates under regular MACRS.
§179 Expensing
Connecticut generally conforms to federal §179. The 2026 §179 cap is $2.56M (indexed from OBBBA’s $2.5M) with a $4.09M phase-out threshold.
Property Tax
~1.79% effective on owner-occupied housing (Tax Foundation 2026), one of the higher rates in the country. Property tax is a separate lever; cost segregation operates on income tax through accelerated depreciation.
§481(a) Catch-Up
For Connecticut properties owned more than a year without a study, an automatic accounting-method change (Form 3115 under Rev. Proc. 2015-13 and its updates) captures all missed depreciation into the current tax year at the federal level, no amended returns required.
Every Commercial Asset Class in Connecticut
Connecticut Property Types Where Cost Segregation Delivers
Insurance & finance
Hartford’s insurance corridor (The Hartford, Travelers, Aetna, Cigna) and Stamford’s hedge fund and financial services cluster run high-density office property with specialized systems.
Biotech & life sciences
New Haven (Yale) and Fairfield County biotech and pharma facilities have exceptional reclassification content, labs, clean rooms, specialized HVAC and electrical.
Aerospace & defense
Sikorsky (Stratford), Pratt & Whitney (East Hartford), Electric Boat (Groton), Connecticut’s aerospace and defense manufacturing base runs specialized industrial property.
Gaming & hospitality
Foxwoods and Mohegan Sun in eastern Connecticut, plus Connecticut’s business travel and destination hospitality corridors, produce hotel and specialty property with heavy FF&E.
Healthcare & medical office
Yale-New Haven, Hartford HealthCare, and Nuvance active medical office and specialty facility corridors.
Multifamily
Fairfield County (Stamford, Norwalk), Hartford metro, and New Haven multifamily development.
Retail & mixed-use
Statewide retail centers and mixed-use developments.
Investment residential
5+ unit properties eligible for cost segregation.
Not sure whether your Connecticut property qualifies? Request a free benefit analysis, we’ll tell you honestly.
Credentialed. Independent. Nationwide
Why The Ambrose Group?
MAI-certified appraisers, in-house engineer
The IRS prefers engineering-based studies over rule-of-thumb estimates. Our in-house engineer conducts the analysis, reviews construction documents, and physically identifies reclassifiable components. Many providers estimate; we don’t.
IRS-compliant methodology
Every Ambrose study follows the IRS Cost Segregation Audit Techniques Guide (ATG, Publication 5653).
30+ years of nationwide experience
Headquartered in Texas, serving Connecticut and all 50 states.
Audit Defensibility
Our engineering-based cost segregation studies are built to hold up, with site inspections, detailed documentation, and support if the IRS ever asks.We deliver a complete reclassification package your CPA can apply directly, including the depreciation detail your CPA needs to maintain the separate Connecticut MACRS schedule.
CPA-ready reports
We deliver a complete reclassification package your CPA can apply directly, including the depreciation detail your CPA needs to maintain the separate Connecticut MACRS schedule.
Single-property to multi-state portfolios
Whether you own one Connecticut commercial building or a portfolio spanning multiple states, we scale the engagement to fit.
Real Numbers
What First-Year Savings Might Look Like in Connecticut
Results depend on property type, cost basis, construction year, and applicable depreciation rates, and we run a free benefit analysis before you commit to a study so you can see projected numbers first.
As a reference point, an Ambrose Group engagement on a $2.9M commercial property delivered $657,692 in first-year depreciation increase and $230,192 in first-year tax savings. In Connecticut specifically, the federal Year 1 savings apply fully; the Connecticut state benefit is spread across the useful life of the reclassified components under regular MACRS (no state-level bonus stacking). Given Connecticut’s 6.99% top individual rate and 7.5% corporate rate (plus surtax for larger corps), the federal deduction combined with Connecticut’s rate structure delivers strong overall value.
Get Started
Free Connecticut Cost Segregation Benefit Analysis
Tell us about your Connecticut property, asset type, acquisition or construction cost, when it was placed in service, and we’ll run a free benefit analysis showing projected first-year depreciation and tax savings before you commit to a study.
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Right approach for your property type
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Federal benefit modeled + Connecticut state-timing considerations
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Clear read on the study’s projected ROI
Prefer to talk? Call us directly:
(713) 688-7733
The Ambrose Group headquarters, Jersey Village, TX (serving Connecticut and all 50 states).
Request Your Free Analysis
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How It Works, Connecticut & Nationwide
Our Cost Segregation Process
What Clients Say
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Cost Segregation in Connecticut
Frequently Asked Questions
Does Connecticut conform to federal bonus depreciation rules?
No. Connecticut is decoupled from federal §168(k) bonus depreciation for corporate business tax filers (Conn. Gen. Stat. §12-217(b)). As of May 26, 2026, Connecticut also decouples from the new §168(n) qualified production property provision under OBBBA (Conn. Public Act 26-68 §265). Federal bonus depreciation is added back on the Connecticut corporate return; property depreciates under regular MACRS. Your federal Year 1 tax savings from a cost segregation study are fully preserved.
How does Connecticut’s income tax structure interact with a cost segregation study?
Connecticut’s individual income tax reaches 6.99% at the top bracket. The corporate business tax has a 7.5% baseline rate with a 10% surtax for larger corporations ($100M+ gross proceeds or combined unitary groups), extended through 2028. Because Connecticut is decoupled from federal bonus depreciation, the state-level Year 1 benefit is limited relative to conformity states. However, the reclassified MACRS depreciation still reduces Connecticut taxable income faster than the default 39-year (commercial) or 27.5-year (residential) schedule, and given Connecticut’s high state marginal rates, that acceleration still moves the needle.
What Connecticut commercial property types benefit most from cost segregation?
Insurance and finance office in Hartford and Stamford, biotech and life sciences in New Haven and Fairfield County, aerospace and defense manufacturing (Sikorsky, Pratt & Whitney, Electric Boat), Foxwoods and Mohegan Sun gaming properties, and multifamily across Fairfield County and Hartford metro. Specialized-finish and equipment-heavy property produces the strongest results.
Can I do a cost segregation study on a Connecticut property I’ve owned for years?
Yes. A §481(a) adjustment via an automatic accounting-method change (Form 3115 under Rev. Proc. 2015-13 and its updates) lets you capture all missed depreciation from prior years into the current tax year without amending past returns. Especially valuable for long-held Connecticut commercial and multifamily properties.
How do you do a cost segregation study on an Alabama property when you’re based in Texas?
Cost segregation is governed by federal tax law, so the study methodology is identical regardless of state. Our engineer conducts the analysis in one of two ways: an in-person Alabama site visit or, for well-documented properties, a virtual site inspection using high-definition video, construction documents, and interactive tools. Both are IRS-compliant.
How do you do a cost segregation study on a Connecticut property when you’re based in Texas?
Cost segregation is governed by federal tax law, so the methodology is identical regardless of state. Our engineer works either through an in-person Connecticut site visit or, for well-documented properties, a virtual site inspection using high-definition video, construction documents, and interactive tools. Both are IRS-compliant.
What construction era of Connecticut property produces the strongest cost segregation outcomes?
Properties placed in service since 1987 are eligible under current IRS guidance, and studies limited to the last 7–10 years tend to deliver the strongest ROI. Connecticut’s biotech, life sciences, and Fairfield County multifamily development pipelines have produced substantial newer property in the ideal window.
What documentation do you need for a Connecticut cost segregation study?
Purchase or construction cost documentation, a current depreciation schedule from your CPA, construction plans or specs (when available), any prior appraisals, and, for renovation studies, improvement records. Because Connecticut maintains a separate depreciation schedule (no §168(k) or §168(n) bonus), your CPA will need the detailed asset schedule to run the Connecticut MACRS calculation. We provide it as part of the standard deliverable.
Can you handle Connecticut multi-property portfolios?
Yes. We regularly run cost segregation studies across multi-state and Connecticut-only portfolios. Common for Fairfield County multifamily portfolios, Hartford insurance/finance office portfolios, and specialty industrial operators.
How long does a cost segregation study take on a Connecticut property?
From engagement to CPA-ready report, most studies run 4–8 weeks depending on property complexity, document availability, and site-visit scheduling. Complex biotech, aerospace, or hospitality facilities take longer proportional to specialized-content cataloging.
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Talk to Trusted Cost Segregation Consultants
We live by our motto: “Everything we do is driven by the relationship, not the transaction”, and we mean it. Whether you have a Connecticut property to evaluate or a multi-state portfolio to review, we’re here to help. Contact our real estate firm.