Consultation published on modernising and standardising company tax returns

Following the Government’s announcement at Budget 2025 that Corporation Tax computations will move to a prescribed format, HMRC have launched a consultation on Modernising and standardising company tax returns. 

The consultation seeks views on the proposed implementation timelines for the prescription of Corporation Tax computations, the arrangements that HMRC will introduce to ensure a smooth transition from the current rules, and HMRC's proposals for proportionate enforcement mechanisms to support compliance. It also addresses mandatory online filing for amended company tax returns and invites feedback on potential issues.

The proposals would require all companies to submit computations in a standardised fully tagged format. This is intended to reduce errors, improve clarity for taxpayers and agents, and allow HMRC to process returns more efficiently. 

The ATT will be responding to this consultation. If members have any comments or views, please email them to [email protected] by 15 May 2026.