Working as a Contractor in Connecticut: Tax, Licensing and Getting Paid

Most of what changes for a tradesperson in Connecticut is set by the state, not Washington: how you get paid, whether you need to register, and what you owe in tax. Here is what actually differs, and where to run your own numbers.‍‌‌‌‌​​‌​‌‌​​‌‌​​‌‌​‌‌‌​‌​​​‌​​‌‍

Each section below points to a tool that runs your exact numbers for Connecticut.

Tax in Connecticut

Connecticut has a graduated state income tax that runs up to 6.99% at the top, on top of your federal taxes. Graduated means the rate climbs as your profit does, so a good year costs proportionally more. You owe federal income tax and self-employment tax as well, and you make estimated payments to both Connecticut and the IRS through the year.

On sales tax, Connecticut is one to read carefully. Labor taxable (6.35%) on existing commercial/income-producing property; exempt new-build + owner-occ residential. Charging tax you should not, or eating tax you should have passed on, comes straight off your margin, so confirm it for your kind of job.

Work out what to hold back on the Tax Set-Aside Calculator, which runs the federal and self-employment numbers for Connecticut.

Getting paid: liens and retainage

A mechanic's lien is the tool that actually gets a Connecticut contractor paid, and in Connecticut you generally have to record it within 90 days of your last day of work. Miss it and you lose the lien, so the dates matter.

Enforcing it has its own clock. 1 year from recording. Work out your dates on the Lien Deadline tool, and if they are close, get an attorney to confirm them against the statute (Conn. Gen. Stat. §§49-34, 49-35, 49-39).

On money held back as retainage, here is where Connecticut lands:

• Private work: 5% of the estimated amount of a progress payment.
• Public work: 7.5% of any periodic or final payment properly due. 5% of any periodic or final payment properly due. 2.5% of any periodic or final payment properly due.
• Release: Private: 30 days (the statute does not say whether these are calendar or business days) from the owner or the owner's authorized representative issues a certificate of final completion, or gives equivalent written acceptance of the construction project work. Public: no number of days is set at all. It falls due on the statute names no final-release event for public work.
• Prompt pay: On private work a prime must pay a subcontractor within 25 days of being paid, and the contract is required by statute to say so. On public work it is 30 days. Late payment carries 1% a month, starting 10 days after written notice of non-payment, plus 10% damages where the withholding was in bad faith.

And the step-down is not the same thing as a right. Connecticut cuts the rate to 5% when 50% of the contract is completed, evidenced by a complete application for payment demonstrating it. That drop is not automatic: you have to apply for it in writing, and it can carry further conditions. The statute carries no reinstatement clause.

Check the Retainage Calculator before you sign a contract that holds back more.

Free Connecticut retainage letters

Three letters written for Connecticut's rules, with the state's own release clock and its statutory citation already in them. Fill one in on screen and download it as a PDF or a Word file.

• Retainage Release Request (Connecticut), for when the job is done and the money has not come back
• Retainage Overdue: Demand for Payment (Connecticut), for when the release date has passed and nothing has arrived
• Retainage Held Above the Cap: Challenge Letter (Connecticut), for when more is being held than the state appears to permit

Do you need a license in Connecticut?

Connecticut does not make you sit a full contractor license, but it does require you to register with the state before you work. Registration is lighter than a licensing exam, but skipping it can cost you: in a lot of states an unregistered contractor cannot even sue to get paid. The requirement: THREE separate regimes. Home Improvement registration once a job exceeds $200, or contracts with all customers exceed $1,000 in any 12 consecutive months; New Home Construction registration regardless of value; and Major Contractor registration on large structures, measured in STORIES AND SQUARE FEET, not dollars. It is handled by Department of Consumer Protection.

Trade licenses for electrical, plumbing and HVAC are usually separate and often required even where a GC license is not. See what applies to your trade on the Contractor License Checker.

Building codes and permits

Connecticut adopts its building codes statewide, so the rules travel with you across the state. Editions still move, so confirm yours with the building department before you price a job.

• Homes: 2021 (published as the 2022 Connecticut State Building Code)
• Electrical: 2020 (with Connecticut amendments, in the same 2022 package)
• Energy: 2021 (with Connecticut amendments, in the same 2022 package)
• Plumbing: 2021 IPC (with the IRC plumbing chapters governing one- and two-family dwellings)

Connecticut sets one code for the whole state and no town, city or borough may opt out, amend it or substitute an edition: C.G.S. §29-252(a) makes the State Building Code the building code for all of them. There is therefore nowhere in Connecticut where nothing governs. The state names the package by its own year, so the 2022 Connecticut State Building Code carries the 2021 I-Codes and the 2020 NEC; build to the Connecticut-amended text. The 2026 package built on the 2024 I-Codes and 2023 NEC missed its 1 July 2026 target and is still waiting on the Legislative Regulation Review Committee, with no new effective date set.

Source: Office of the State Building Inspector and the Codes and Standards Committee under C.G.S. §§29-252 and 29-252b; 2022 Connecticut State Building Code, effective 1 October 2022. Read against that source on 2026-08-25.

Check a specific job on the permit tool.

Pay and workers' comp

The minimum wage in Connecticut is $16.94 an hour. CPI-indexed. That is the floor for anyone you put on the books, and it is worth confirming against the state labor department each year because several states step their rate mid-year. Check a rate on the minimum-wage tool.

Workers' comp rates in Connecticut are not published as a single figure; they turn on your trade's class code and your payroll. Get a realistic range on the Workers' Comp Estimator, then get a real quote.

If a client will not pay

If a client will not pay, you can sue for up to $5,000 in Connecticut's Small Claims (Superior Court). That covers most unpaid-invoice disputes for a small outfit; a bigger claim goes to regular civil court where you will probably want an attorney. Walk through whether filing is worth it on the Small Claims checker.

The clock runs the other way too: a client generally has 6 years to sue you over the work under a written contract in Connecticut, and there is no absolute cutoff, so your exposure turns on when a defect is found. Work out your exposure on the Warranty & Claim Deadline tool.

Common questions

How much state income tax will I pay in Connecticut?

Connecticut has a graduated rate up to 6.99% state income tax on your profit, on top of federal income tax and self-employment tax. Use the Tax Set-Aside Calculator to see what to hold back.

Do I need a contractor's license in Connecticut?

Connecticut does not require a full license but does require you to register with the state first. The requirement: THREE separate regimes. Home Improvement registration once a job exceeds $200, or contracts with all customers exceed $1,000 in any 12 consecutive months; New Home Construction registration regardless of value; and Major Contractor registration on large structures, measured in STORIES AND SQUARE FEET, not dollars. Working unregistered can stop you suing to get paid.

What is the small claims limit in Connecticut?

You can sue for up to $5,000 in Connecticut's Small Claims (Superior Court). The filing fee is typically $95. Larger claims go to regular civil court.

How long do I have to file a mechanic's lien in Connecticut?

Generally 90 days from your last day of work. Miss it and you lose the lien. Work your own dates out on the Lien Deadline tool.

How much retainage can be held back in Connecticut?

Private: 5% of the estimated amount of a progress payment. Public, state agency: 7.5% of any periodic or final payment properly due. Public, municipal: 5% of any periodic or final payment properly due. Public, transportation: 2.5% of any periodic or final payment properly due. Run your own figure on the Retainage Calculator.

Are there free Connecticut contract and payment forms?

Yes. This page links 3 retainage letters written to Connecticut's own release clock and carrying its statutory citation. They are free, there is no sign-up, and you fill one in on screen and download it as a PDF or a Word file.

What is the minimum wage in Connecticut?

$16.94 an hour in Connecticut, above the federal $7.25. Several states step their rate mid-year, so confirm it before you set a payroll.

The honest bit

These are the 2026 rules for Connecticut as they stood when this guide was written, and they change: legislatures move thresholds, deadlines and rates every year. Treat this as general guidance to point you in the right direction, not legal, tax or financial advice. Verify anything you rely on at the source (the IRS, the Connecticut tax and licensing agencies, and your local building department) or with a professional. Where Connecticut does something unusual, the detail is called out above rather than glossed over.

Related: Tax Set-Aside Calculator · Mechanic's Lien Deadline · Contractor License Checker · Small Claims checker · Working in Your State

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