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The Supplemental Schedule CT-1040WH, commonly referred to as the CT-1040WH, is a tax form used in the State of Connecticut for reporting Connecticut income tax withholding. It is particularly required when a taxpayer has more than five income sources from forms W-2, 1099, or Schedule CT K-1. This form consolidates additional income and withholding information, ensuring accurate tax filings.
When completing the CT-1040WH, follow these detailed steps to ensure accuracy:
Gather Required Documents: Collect all forms W-2, 1099, and CT K-1. Ensure each document reflects the correct income and withholding information for the tax year in question.
Enter Identification Information: Fill out your personal information, including Name, Social Security Number (SSN), and the tax year.
List All Income Sources:
Calculate Total Withholding: Sum all withholding amounts from the additional income sources to ensure it aligns with your main tax form entries.
Final Review: Double-check all entries for accuracy and ensure totals match the amounts reported on your primary tax documents.
This tax form includes specific sections essential for capturing comprehensive information about multiple income sources and tax withholdings:
Timely filing of the CT-1040WH is critical for compliance:


The Supplemental Schedule CT-1040WH serves legal obligations for tax reporting within Connecticut:
Consider a case where an individual has multiple part-time jobs in Connecticut. They receive several forms W-2 for jobs held throughout the year. Using the CT-1040WH, they consolidate and report all state withholdings accurately, preventing tax discrepancies and ensuring compliance with Connecticut state tax regulations.
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