startOnline Filing
How To

Online Filing

CCH Corporation Tax
Last update: Reading time 2 minutes
Online Filing

    You can electronically submit the CT600, Supplementary pages, accounts and computations to HMRC using CCH Corporation Tax.   Ensure that your organisation has created the appropriate Online filing credentials. click to view help on Setting up online filing credentials.

    Topics in this section:

    • Preparing returns for online filing

      It is essential that the return is completed with no underlying errors or exceptions prior to creating the online submission. This will help to ensure the electronic submission of the return and accompanying documents are successful. Data validations will be displayed if there is any error in the data input which will prevent a successful submission.

    • Creating submissions

      You can create both original and amended submissions. To access Online filing click the Online filing hyperlink in the Actions panel in the left hand navigation panel. Ensure that the appropriate task permission has been set for the security group. There are three essential steps to the creation of the submission: Preparing the return for submission Attaching accounts, computations and other documents Pre-validating the submission

    • Pre validating the submission

      The submission will be validated before the IRMark can be created. This means the submission will be reviewed and compared with the documents and rules provided by HMRC.

    • Data has changed - Review Changes

      This compares the data held in the application with the data shown on the Form CT600 and the Corporation Tax Computations that have been generated but have not yet been submitted to HM Revenue & Customs.

    • HMRC live submissions

      This section explains how to submit the Return, company accounts and computation to HMRC for approval.

    • Multiple accounting periods

      The section explains how to create submissions where there are multiple accounting periods within a period of account.

    • Amended submissions

      This section explains how to create and submission an amended submission to HMRC following the first submission to HMRC..

    • Attaching accounts

      Accounts can be appended to the CT return via CCH iXBRL Review & Tag or added within CCH Corporation Tax Online Filing.

    Related documents

    CCH Corporation Tax 2026.3: Release Notes
    Release Notes for CCH Corporation Tax 2026.3
    CCH Corporation Tax 2026.2: Release Notes
    Release Notes for CCH Corporation Tax 2026.2
    Getting Started
    This document provides a quick start guide for using CCH Corporation Tax software. It outlines essential features such as the Data Navigator, which assists in completing clients' Returns, and the use of Breadcrumbs for navigation. Additionally, it explains the functions available in the Ribbon panel located at the top of the screen. Overall, the document aims to streamline the user experience by highlighting key tools and navigation methods within the software.
    Non Trade Loan Relationships
    This document outlines topics related to Non Trade Loan Relationships in corporate tax computations. It includes links to sections on Non Trade Loan Relationship Summary, Credits, and Debits, detailing how to input and summarize these tax-related items in the Data Navigator. Each section describes the process for entering data and how totals are summarized for reporting purposes. Additionally, it links to related topics like Foreign Income and Miscellaneous Income.
    Document Publishing
    This document outlines the options for electronically storing tax returns and computations using CCH Document Management and CCH OneClick. It emphasizes that access to these tools requires appropriate licenses and user rights. Users can publish tax returns and computations both in draft form for client review and at various stages in the submission process to HMRC. The document includes specific links to guides on how to publish documents using both systems.