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

Preparation of each Return submission

A separate submission is required for each CT600 for each accounting period.

Clear any data validation errors.

Ensure the settings are correct for Accounts attached and Computations attached.

The accounts and computation must only be attached to the second of the accounting periods within the period of account.

Therefore in the first accounting period, within Main Return Data select No accounts attached? and No computations attached?  and clear the errors by selecting the appropriate reasons from the drop down menus.

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In order that HMRC's gateway links the accounting periods ensure Accounts attached for a different period? and Computations attached for a different period? are both selected in Main Return Data in the last accounting period 

Create the submission for each accounting period.

Submit each return for each accounting period.

Delays of more than a day between the submission of each period may result in HMRC deleting the submission for the accounting period they have received. 

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.