Supplemental Schedule CT-1040WH, Connecticut Income ... - CT.gov 2026

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Definition & Meaning

The Supplemental Schedule CT-1040WH is an official document issued by the State of Connecticut's Department of Revenue Services. Its primary purpose is to assist taxpayers in reporting Connecticut income tax withholding when they have more than seven forms, such as W-2s, 1099s, or Schedule CT K-1s. This schedule is crucial for ensuring accurate tax reporting, as it provides a structured way to present all withholding information for the 2013 tax year and beyond. By utilizing this supplemental schedule, taxpayers can correctly enter employer information and calculate the total Connecticut state income tax withheld.

How to Use the Supplemental Schedule CT-1040WH

To effectively use the Supplemental Schedule CT-1040WH, taxpayers should follow these steps:

  1. Gather the Necessary Forms: Collect all W-2s, 1099s, or Schedule CT K-1s. Ensure you have more than seven forms to meet the usage requirements of this supplemental schedule.

  2. Enter Employer and Payer Details: Carefully input the name and address of each employer or entity that provided income and withholding documentation.

  3. Report Withholding Amounts: Accurately transfer the Connecticut income tax withholding amounts listed on your W-2s and other relevant forms onto the supplemental schedule.

  4. Calculate Totals: Sum the withholding amounts from all forms to arrive at the total Connecticut income tax withheld.

  5. Transfer Data to CT-1040: Once completed, this schedule becomes an attachment to your primary Connecticut income tax return, Form CT-1040. Ensure all data is accurately reflected to avoid discrepancies.

How to Obtain the Supplemental Schedule CT-1040WH

The Supplemental Schedule CT-1040WH is accessible through multiple channels:

  • Connecticut Department of Revenue Services Website: This is the most direct method, where you can download a PDF copy for print or digital use.

  • Local Libraries or Tax Assistance Centers: Some physical locations may provide copies of necessary forms, especially during peak tax season.

  • Tax Preparation Software: Many tax filing programs incorporate the schedule, allowing electronic completion and submission.

Ensure you have a compatible PDF viewer if you choose the digital download option to seamlessly fill out and save the form.

Steps to Complete the Supplemental Schedule CT-1040WH

When completing the Supplemental Schedule CT-1040WH, follow these detailed steps:

  1. Gather Documentation: Organize all forms with withholding details.

  2. Complete Identification Section: Fill out the top portion with your personal information, ensuring it's consistent with your CT-1040.

  3. Input Employer and Payment Information: List details from each form into separate rows on the schedule.

  4. Fill in Withholding Amounts: Enter the Connecticut withholding from each form accurately.

  5. Sum the Totals: Add all reported withholding amounts and check for calculative accuracy.

  6. Review and Attach: Verify details and attach the schedule to your CT-1040 before submission, ensuring compliance with Connecticut tax requirements.

Key Elements of the Supplemental Schedule CT-1040WH

This supplemental schedule is composed of several integral components:

  • Taxpayer Information: Including full name, Social Security number, and other identifying details.

  • Employer Details: These include names and addresses for each entity that issued a withholding document.

  • Withholding Data: Accurate replication of Connecticut tax withheld as reported on original forms.

  • Total Withholding Calculation: Summarization of all entries to form a single total.

Attention to each element ensures compliance and prevents errors in state tax filings.

Who Typically Uses the Supplemental Schedule CT-1040WH

The use of the Supplemental Schedule CT-1040WH is primarily reserved for taxpayers residing in Connecticut who:

  • Have multiple employment sources surpassing seven relevant forms.
  • Are required to disclose detailed withholding information as a part of their state tax obligations.

This schedule is particularly relevant for individuals with diverse income streams, such as freelancers, contract workers, or those holding multiple jobs during a tax year.

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Important Terms Related to Supplemental Schedule CT-1040WH

Understanding key terms linked to the schedule is beneficial:

  • Withholding: The amount of income tax retained by an employer from paychecks for forwarding to the state.

  • W-2, 1099, Schedule CT K-1: Various forms used to report income and withholding, highlighting employer-payer relationships.

  • Employer Identification Number (EIN): A unique number assigned to every employer, critical for form accuracy.

Familiarity with these terms aids in proper completion and understanding the context of the schedule.

Form Submission Methods (Online / Mail / In-Person)

The Supplemental Schedule CT-1040WH can be submitted to the Connecticut Department of Revenue Services using several methods:

  • Online Submission: Attach the schedule while electronically filing your CT-1040 tax return via approved software platforms.

  • Mail: Print and send completed forms to the designated tax office address as indicated in official tax communication.

  • In-Person: Deliver the completed documents to a Connecticut state tax office, where applicable, for direct submission.

Choosing the submission method that best suits your preference ensures timely and effective reporting.

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Connecticut Tax Rates, Collections, and Burdens Connecticut has a graduated state individual income tax, with rates ranging from 2.00 percent to 6.99 percent. Connecticut has a 7.5 percent corporate income tax rate. Connecticut also has a 6.35 percent state sales tax rate and does not have local sales taxes.
Use Form CT‑1040ES, Estimated Connecticut Income Tax Payment Coupon for Individuals, to make estimated Connecticut income tax payments for 2024 by mail. If you made estimated tax payments by mail in 2023, you will automatically receive coupons for the 2024 taxable year in mid‑January.
Connecticut‑sourced income of a part‑year resident is the sum of: Connecticut adjusted gross income for the part of the year you were a resident; Income derived from or connected with Connecticut sources for the part of the year you were a nonresident; and. Special accruals.
The law fully exempts qualifying pension and annuity income (including 401(k), 403(b), or 457(b) plans) from income tax for taxpayers with federal AGIs below (1) $75,000 for single filers, married people filing separately, and heads of household or (2) $100,000 for married people filing jointly.
Complete this schedule to report dependents claimed on your 2022 federal Form 1040. This information will be used by the Connecticut Department of Revenue Services (DRS) to determine your eligibility for any DRS administered programs.

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