What tax forms are required for new hires?

Tax Forms Required for New Hires in Connecticut

When hiring employees in Connecticut, it is essential to collect and submit the appropriate tax forms to ensure compliance with federal and state requirements. Proper handling of these forms supports accurate payroll processing, tax withholding, and reporting.

Federal Tax Forms

• Form W-4 (Employee's Withholding Certificate): New employees must complete this form to determine federal income tax withholding. Employers use the information to calculate the correct amount of federal tax to withhold from each paycheck.
• Form I-9 (Employment Eligibility Verification): Although not a tax form, it is mandatory to verify the employee’s eligibility to work in the U.S. This form must be completed within three days of hire and retained for compliance purposes.

Connecticut State Tax Forms

• CT-W4 (Connecticut Withholding Certificate): Connecticut requires employees to complete this state-specific withholding form to determine the correct amount of state income tax withholding.
• New Hire Reporting: Employers must report all new hires to the Connecticut Department of Labor within 20 days of the hire date. This reporting supports state wage and unemployment insurance tax administration.

Operational Considerations

• Timely Collection: Collect Form W-4 and CT-W4 on or before the employee’s first day to avoid default withholding rates.
• Recordkeeping: Maintain copies of all completed forms securely for at least four years to comply with IRS and state audit requirements.
• Payroll Setup: Use the information from W-4 and CT-W4 to configure payroll software for accurate tax withholding and reporting.
• Automation: Consider using electronic onboarding systems to streamline form collection, reduce errors, and improve compliance.

As of 2026, staying current with both federal and Connecticut-specific tax form requirements ensures smooth payroll operations and reduces risk of penalties.