Federal & State Tax Forms

Federal Tax Forms

Withholding allowances for federal income tax purposes are claimed on Form W-4, designated as the Employee’s Withholding Allowance Certificate.

This is filed by the employee with the employer during the initial hiring process. If no Form W-4 is filed, the employer must withhold tax as if the employee was single and had claimed no exemptions. The employee may change his or her withholding allowance at any time during employment.

• Federal Form W-4
• Employer’s Tax Guide (Circular E)

Click here for a link to other federal tax forms and publications.

Connecticut Tax Forms

For purposes of state income tax purposes, employers are required to retain a Form CT-W4 in their files for each employee.

They must also file copies of Form CT-W4 with the Connecticut Department of Revenue Services for certain employees claiming exemption from the Connecticut withholding.

A copy of Form CT-W4 for all new hires should be sent to the state Department of Labor to assist in the enforcement of child support obligations.

• Form CT-W4: Employee’s Withholding Certificate
• All State Withholding Forms (CT-W3, CT-1096, CT-941, CT-945)

Connecticut also has a range of business tax requirements.

• Attorney Occupational Tax (Form 472)
• Business Entity Tax (OP-424)
• Composite Income Tax (CT-1065/CT-1120SI)
• Corporation Business Tax
• Excise Tax Forms
• Partnership Returns
• Public Service Tax Forms
• Sales Tax & Other Vendor Taxes
• Unrelated Business Tax (CT-990T)