Company Tax Returns Consultation

HMRC Policy Papers & Consultations

Published March 10th, 2026

Detected March 10th, 2026

Summary

HM Revenue & Customs has launched a consultation on modernising and standardising company tax returns. The consultation seeks feedback on proposed delivery timescales and enforcement mechanisms for prescribed content, format, and data tagging of Corporation Tax computations, as well as mandatory online filing of amendments. The consultation closes on June 2, 2026.

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What changed

HM Revenue & Customs (HMRC) has initiated a consultation regarding the modernization and standardization of company tax returns. This initiative aims to introduce prescribed formats for Corporation Tax computations to enhance data quality and consistency. The consultation specifically seeks input on the proposed timeline for adopting these standardized formats and the enforcement strategies to ensure compliance. Additionally, it addresses the potential requirement for mandatory online filing of amendments to company tax returns, inviting views on the associated timescales and possible exemptions.

Companies and their tax advisors should review the proposed changes and provide feedback by the consultation deadline of June 2, 2026. The outcome of this consultation will likely lead to new mandatory requirements for the content, format, and digital submission of tax data, potentially impacting reporting processes and compliance obligations. Failure to comply with future standardized requirements could result in enforcement actions, though specific penalties are not detailed in this consultation document.

What to do next

Review proposed changes to Corporation Tax computation content, format, and data tagging.
Provide feedback on proposed timescales and enforcement mechanisms by June 2, 2026.
Assess implications of mandatory online filing for tax return amendments.

Source document (simplified)

Open consultation

Modernising and standardising company tax returns

From: HM Revenue & Customs Published 10 March 2026 Get emails about this page

Summary

A consultation exploring delivery timescales and enforcement for full prescription of the content, format, and data tagging of Corporation Tax computations.

This consultation closes at
**
11:59pm on 2 June 2026
**

Consultation description

The government is introducing prescribed formats for Corporation Tax computations to improve the quality and consistency of Corporation Tax data.

This consultation invites feedback on the proposed timeline for moving to this standardised format and the necessary enforcement mechanisms to ensure compliance.

As a related measure, the government will also require mandatory online filing of amendments to company tax returns and seeks views on the timescales for this change and any potential exemptions from this requirement.