The online accounts and Company Tax Return system to shut down in 2026

Businesses that have relied on the joint online filing service for Company Tax Returns and accounts submissions will need to find alternative solutions, as Companies House and HMRC have confirmed the system will be permanently shut down on 31 March 2026.

The move marks a significant shift in how UK businesses file statutory accounts and tax returns, aligning with broader digital transformation and regulatory changes under the Economic Crime and Corporate Transparency Act (ECCT Act).

Since its inception, the online filing service has allowed businesses to submit both their annual accounts to Companies House and their Company Tax Returns to HMRC in one step. But with a growing emphasis on digital modernisation, enhanced compliance measures, and corporate transparency, the system has become outdated and is no longer fit for purpose.

From 1 April 2026, companies will need to file accounts separately using either third-party software, Companies House’s web services, or traditional paper-based submissions. However, Company Tax Returns will only be accepted through software solutions, reinforcing HMRC’s push towards digital tax reporting.

Why the Change?

The closure is driven by a combination of technological and regulatory factors. The joint filing service no longer aligns with modern digital standards or the evolving corporation tax framework.

Additionally, the ECCT Act has introduced stricter corporate governance and anti-fraud measures, requiring Companies House to upgrade its systems and implement processes such as identity verification. Moving to a software-based filing model will improve data accuracy, enhance security, and better integrate with future regulatory requirements.

What Businesses Need to Do Now

For businesses that currently rely on the joint filing system, the transition to new processes should start sooner rather than later. Here’s what companies should do to prepare:

• Download Past Filings: Businesses should save at least three years’ worth of accounts submissions before the system shuts down, as historical filings will not be accessible after 1 April 2026.
• Review Filing Options: Companies must assess their options for submitting accounts. While Companies House will still support paper-based and web portal submissions, businesses should consider switching to third-party accounting software for efficiency.
• Ensure Software Compatibility: As HMRC will only accept tax returns via software, businesses need to ensure they have compatible digital tax solutions in place well before the transition deadline.
• Plan for Digital Filing Compliance: The move to mandatory software filing supports Companies House’s goal of a fully digital system, helping to prevent economic crime and align with international best practices.