Starting a service business in Connecticut comes down to four things: picking a structure, registering with the state, getting licensed for your trade, and setting up a way to bill customers. Filing an LLC in CT costs $120, ongoing reporting is $80/yr, sales tax is 6.35%, and personal income tax runs 3%–6.99%. Below is the full sequence, the fees you should budget for, the licenses most trades need, and the deadlines that catch new Connecticut owners off guard.
Most new registrations come out of Stamford, New Haven, Hartford and the rest of Connecticut — local business licenses are issued at the city or county level, so check yours after the state filing clears.
| Item | CT cost |
|---|---|
| LLC / entity filing (one-time) | $120 |
| Annual / periodic report | $80/yr |
| Federal EIN (IRS) | Free |
| Sales tax registration | Typically free |
| Trade / professional license | Varies by trade |
| Local business license | Set by city / county |
Fees change — confirm current amounts with the CT Secretary of State and the Connecticut Department of Revenue Services.
Choose your structure and file with the CT Secretary of State ($120). Get your free EIN from the IRS the same day.
Register for Connecticut sales tax with the Connecticut Department of Revenue Services, then open a business bank account under the registered name.
Apply for your trade license and local business license. This is usually the longest step: Sales tax permit; Professional license.
Get general liability insurance (and workers' comp before your first hire), then set up estimates and invoicing so you can bill the day you're cleared to work.
LLC Filing Fee
$120
Annual Report
$80/yr
Sales Tax
6.35%
Income Tax
3%–6.99%
Choose business structure
Register with CT Secretary of State
Get EIN
Register for state taxes
Get local permits
Open business bank account
Annual reports due on the anniversary of formation
Some services are taxable in CT — check carefully
Connecticut taxes many services that other states don't. Check the DRS list.
Online LLC filings with the CT Secretary of State are typically processed in a few business days, and an EIN from the IRS is issued immediately online. Trade licensing and local permits usually take longest — plan on two to six weeks before you're fully cleared to work, depending on your trade.
No — you can operate as a sole proprietor in Connecticut and still invoice customers legally. An LLC ($120 to file, $80/yr) separates your personal assets from business liability, which matters most once you're on customer property, hiring help, or signing contracts.
Connecticut sales tax is 6.35%. Materials and goods are commonly taxable, while labor treatment depends on the type of work, so bill parts and labor as separate lines and register with the Connecticut Department of Revenue Services before you start collecting.
Open a business bank account under the registered name, then invoice from a tool that applies CT tax per line item and accepts cards. Glo Invoice sends invoices by text with a one-tap pay link, and Tap to Pay lets you charge on site before you leave the job.