The Main Pool is available in the Trading Summary and Management Expense sections of the Data Navigator

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Tax written down value brought forward is a manual entry in the first accounting period.  For subsequent accounting periods it is calculated from the preceding period's carry forward.  If this value requires amendment, use the Tax written down value brought forward override.

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Additions qualifying for AIA/WDA  can be either manual entry or linked from the the Tangible Fixed Assets Additions Analysis input screen

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To claim the annual investment allowance click on the AIA Claimed hyperlink and complete the AIA Claim input screen located in the Data Navigator under Tax Planning >AIA Claim.

A Small pool write off  appears when the written down value is £1,000 or less.

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To disclaim Written down allowance, enter the value to disclaim in the WDA disclaimed field.

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First Year Allowances for Green Technology, low emission cars, Enterprize zones, zero emissions goods vehicles and Electric charge points can be entered or linked from the Tangible Fixed Assets Additions Analysis input screen.

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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.