Connecticut Payroll Taxes and Withholding for Employers

If you hire your first employee in Connecticut, your payroll duties start before the first paycheck goes out. The central one is the Connecticut withholding tax: you take state income tax out of each employee's wages, hold it, and pay it to the Connecticut Department of Revenue Services (DRS) on a fixed schedule. This guide covers the registrations you need, the forms, the deposit and filing calendar, and the year-end paperwork. It also separates withholding from the other employer accounts, so you do not register with the wrong agency or miss a deadline in one of them.

Informational content, not legal or tax advice. This guide summarizes Connecticut payroll tax requirements in general terms. Rates, forms and deadlines change. Confirm current requirements with DRS and consult a qualified CPA or attorney before you act on anything here.

Who has to withhold Connecticut income tax

If you pay wages to employees for work performed in Connecticut, or to Connecticut residents, you generally must withhold Connecticut income tax from those wages. That applies whether your business is an LLC, a corporation, a partnership or a sole proprietorship with staff. Owner draws from a sole proprietorship or single-member LLC are not wages. An S corporation owner who works in the business is an employee and must be paid through payroll.

Remote and multi-state workers are where employers get stuck. Whether a paycheck is Connecticut wages depends on where the work is performed and where the employee lives, and the answer is not always obvious. Settle those cases with DRS or a CPA before the first payroll runs, not after.

Step 1: Complete Connecticut employer registration with DRS

Register for income tax withholding with DRS through myconneCT, the state's online business registration system. You can reach it from the DRS home page at portal.ct.gov/drs. Registration for withholding has no fee. Complete it before you pay your first wages.

Do not confuse this with your entity filing. Forming an LLC or corporation through Business.CT.gov, with the Secretary of the State, creates the legal entity. It does not register you to withhold. Connecticut also has no state general business license, so a payroll registration is a tax registration, not a license.

Once you are registered, every withholding payment and every withholding return must be filed electronically. Paper is not an option for these filings.

Step 2: Register for the other employer accounts

Withholding is one of several employer accounts, and each one is separate. Register for each with the agency that runs it:

• Unemployment insurance tax: register separately with the Connecticut Department of Labor.
• Connecticut Paid Leave: register separately with the CT Paid Leave Authority.
• Sales and use tax: if you sell taxable goods or services, you need a Sales and Use Tax Permit from DRS. It carries a $100 registration fee and must be displayed at each location.

Federal employer obligations run through the IRS and sit outside this guide. Each state account above has its own rules, so read those agency pages instead of assuming one registration covers the others.

Step 3: Collect the Connecticut employee forms

• Form CT-W4: new employees complete it when they are hired. It tells you how much Connecticut tax to withhold from their pay. Keep the signed form in each employee file.
• Form CT-W4P: used for pension and annuity payments, not regular wages. Do not use it in place of CT-W4 for a new hire.

Do not guess at withholding when a form is missing. Get the employee's completed form before the first paycheck.

Step 4: Know your remitter schedule

Connecticut sorts withholding employers into remitter classes: weekly, monthly or quarterly. DRS determines your class, and the Employer's Tax Guide, publication IP 2026(1), explains the rules for each class. Your class sets how often you pay the state. Do not assume a schedule. Confirm yours with DRS.

Remitter class	Withholding payment due
Weekly	The Wednesday after payday. If payday falls on a Saturday through Tuesday, the deadline is the second Wednesday.
Monthly	By the 15th of the following month.
Quarterly	By April 30, July 31, October 31 and January 31.

Your deadlines at a glance

• Weekly, monthly or quarterly payments: due on the dates for your remitter class, as shown above.
• Form CT-941 quarterly reconciliation: due the last day of the month after each quarter. For the quarters ending March 31, June 30, September 30 and December 31, that is April 30, July 31, October 31 and January 31.
• Form CT-W3 annual reconciliation: filed with your W-2s by January 31.

Quarterly reconciliation: Form CT-941

Form CT-941 reconciles what you withheld and reported for the quarter against what you actually paid to DRS. It is due the last day of the month after the quarter ends, and it is filed electronically. Reconcile the quarter's deposits to your payroll records before you file, not after, so the two agree on the first try.

Year-end reporting: Form CT-W3 and W-2s

Each year, file the Form CT-W3 annual reconciliation with your W-2s by January 31. The CT-W3 totals the Connecticut withholding for the year, and its totals should match the W-2s you issue to employees. Prepare both from the same payroll records. Your federal W-2 filing runs through the IRS, so check that the figures line up across both systems.

Common mistakes to avoid

• Running payroll before the DRS withholding registration is complete.
• Treating the Business.CT.gov entity filing as your payroll registration.
• Filing or paying on paper when every withholding filing must be electronic.
• Using Form CT-W4P for regular wages, or skipping Form CT-W4 for a new hire.
• Guessing your remitter class instead of confirming it with DRS.
• Forgetting the Sales and Use Tax Permit when you sell taxable goods or services.
• Looking for a county office. Connecticut has no county government. Local approvals come from your town or city, and where they apply, your local health department or district.

Before your first payroll: checklist

1. Confirm your entity is formed with the Secretary of the State through Business.CT.gov, if you use an LLC or corporation.
2. Complete withholding registration with DRS through myconneCT. There is no fee.
3. Register separately with the Connecticut Department of Labor for unemployment insurance tax.
4. Register separately with the CT Paid Leave Authority.
5. Obtain a Sales and Use Tax Permit from DRS if you sell taxable goods or services.
6. Collect a signed Form CT-W4 from every new employee before the first paycheck.
7. Confirm your remitter class with DRS and put every deadline on your calendar.

Rates and figures to confirm

Connecticut personal income tax is progressive, with seven brackets ranging from 2% to 6.99%. Withholding follows the employee's CT-W4 and the current withholding tables. Those tables change, so pull the current version from DRS rather than from an old spreadsheet or template. Confirm the rates, tables and remitter rules in the Employer's Tax Guide, IP 2026(1), and on the DRS site at portal.ct.gov/drs.

When to get professional help

Payroll errors are expensive to unwind, so bring in help early if any of these apply: you have remote or multi-state employees, you are unsure whether a worker is an employee or a contractor, you run an S corporation and need to set owner pay, or you receive a DRS notice. A CPA handles the tax side of these questions. An attorney handles employment law questions.

Start with the registration, then build your calendar around your remitter class. After your first few payrolls clear on schedule, the rest is routine.