What payroll forms do employers need to file?

Connecticut Payroll Tax Forms Employers Must File

Employers operating in Connecticut need to comply with specific payroll tax filing requirements to remain in good standing with state and federal agencies. Proper filing ensures accurate tax withholding, reporting, and payment.

Key Payroll Tax Forms for Connecticut Employers

• Form CT-941, Connecticut Withholding Reconciliation: Employers use this form to report the total Connecticut income tax withheld from employees during a quarter. It must be filed quarterly with the Connecticut Department of Revenue Services (DRS).
• Form CT-WH, Connecticut Withholding Tax Payment Coupon: This is used to remit Connecticut income tax withheld from employees' wages. Payment frequency depends on the employer’s withholding amount.
• Form W-2, Wage and Tax Statement: Employers must provide employees with a W-2 form by January 31 each year, detailing federal and state wages and taxes withheld. Copies are also filed with the Social Security Administration and Connecticut DRS.
• Form W-3, Transmittal of Wage and Tax Statements: This accompanies W-2 forms when submitted to the Social Security Administration.
• Form 941, Employer's Quarterly Federal Tax Return: Filed with the IRS to report federal income tax withheld, Social Security, and Medicare taxes.
• Form CT-3/CT-4, Employer’s Unemployment Tax Return: Filed quarterly to report and pay Connecticut unemployment insurance taxes to the Connecticut Department of Labor.

Additional Operational Considerations

• Electronic Filing and Payments: Connecticut encourages electronic filing and payment for quicker processing and compliance tracking.
• Recordkeeping: Maintain payroll records, including tax filings and payment confirmations, for at least four years to meet auditing and compliance requirements.
• Employee Classification: Properly classify workers as employees or independent contractors to ensure correct payroll tax treatment and avoid penalties.
• Payroll Automation: Consider using payroll software that integrates Connecticut-specific tax forms and deadlines to reduce errors and streamline filings.

As of 2026, employers should verify current filing frequencies and form versions on the Connecticut Department of Revenue Services and Department of Labor websites to ensure compliance.