Connecticut taxes through the Connecticut Department of Revenue Services at a 6.35% statewide base rate, with local rates stacking on top and economic nexus for remote sellers at $100,000 in sales AND 200 transactions. Filing runs monthly, quarterly, or annually by liability. For construction & trades, that combination is what decides how much of your month-end is bookkeeping and how much is compliance.
Employer registration runs through the Connecticut Department of Labor, and the entity is registered with the Connecticut Secretary of the State. One of the few states requiring BOTH thresholds to be met, not either — so high-value, low-volume sellers often are not required to register.
Sales tax authority
Connecticut Department of Revenue Services — 6.35% statewide base rate
Economic nexus
$100,000 in sales AND 200 transactions
Filing cadence
Monthly, quarterly, or annually by liability
Employer registration
Connecticut Department of Labor
Entity registration
Connecticut Secretary of the State
Labor, materials, and installation in Connecticut
The question that decides Connecticut sales tax for construction & trades is how labor, materials, and installation are treated — states split on whether the contractor is the end consumer of materials or a reseller, and whether installation labor is taxable. One of the few states requiring BOTH thresholds to be met, not either — so high-value, low-volume sellers often are not required to register. We code parts and labor separately on every job so the treatment is deliberate.
Licensing and registration in Connecticut
Contractor and trade licensing in Connecticut is administered separately from tax registration, and the entity itself is registered with the Connecticut Secretary of the State. Licensing is not bookkeeping, but it touches the books — license and permit costs, bonding, and insurance all need consistent treatment, and lenders reviewing a construction & trades file will look for them.
Payroll and employer registration in Connecticut
Employer registration in Connecticut runs through the Connecticut Department of Labor, a different agency from the Connecticut Department of Revenue Services that handles your sales tax — a separate account number, a separate login, and separate deadlines. Businesses routinely register for one and forget the other, then discover the gap when a notice arrives.
Connecticut rates and sourcing
The Connecticut statewide base rate is 6.35%. Local rates stack on top and are generally sourced to the delivery address, so the effective rate varies within the state. Getting sourcing right is what keeps the liability account matching what you actually collected.
We keep the books. You run the business.
Categorization, reconciliation, month-end close, and clean financial statements — with nothing left for you to chase.
View pricingHow It Works
Free review
We check where your construction & trades books stand and whether Connecticut activity has crossed $100,000 in sales and 200 transactions.
Register what is needed
Accounts set up with the Connecticut Department of Revenue Services, plus the Connecticut Department of Labor if you have employees here.
Catch up
Back periods cleaned up at a fixed quoted price, including any Connecticut liability that was collected but never reconciled.
Close on cadence
Monthly close worked backward from your Connecticut due dates — monthly, quarterly, or annually by liability.
Construction & Trades Bookkeeping in Connecticut — Frequently Asked Questions
Do I need to register for sales tax in Connecticut?
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How often would I file in Connecticut?
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Who do I actually deal with in Connecticut?
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Do you prepare my income tax return?
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Construction & Trades bookkeeping in Connecticut
Book a free consultation. We will check where your books stand and whether your Connecticut activity has crossed $100,000 in sales and 200 transactions.
- Done-for-you
- Solo or group
- Nationwide
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