Key Changes from 1 April 2026:
- HMRC will close its free online filing service for Corporation Tax Returns (CT600).
- Companies House will stop accepting free online submissions for company accounts.
- All company filings (CT600 + accounts) must be done via commercial software.
Why Is It Changing?
- Due to increased complexity in returns, commercial software provides more guidance and validation tools.
- It helps improve accuracy and reduce filing errors.
- Many products include deadline reminders to reduce late penalties.
What Should You Do Before April 2026?
- Download and save your past 3 years of CT600 returns and company accounts from the HMRC portal.
- Choose a new compatible software provider and begin the transition early.
How to Save Your Previous Filings:
- Go to “Track Your Submissions” on HMRC online;
- Select the tax year you want to download;
- Click on either “HMRC” or “Companies House” submission link;
- On the filing summary page, click “Save your return in HTML”;
- Save the file to your device.
Free or Low-Cost Filing Options:
| Software | Type | Features | Cost |
|---|---|---|---|
| Taxfiler (IRIS) | Commercial | CT600 + Company Accounts + XBRL | ~£10/month |
| BTCSoftware | Commercial | Full-featured tax platform | From ~£200/year |
| GoSimpleTax | Personal | For sole traders/self-assessment | Free + Pro Plans |
| TaxCalc | Commercial | Trusted by many UK accountants | ~£300/year |
| Nomisma | Cloud-Based | CT600 and account filing | Free trial avail. |
| HMRC Software List | Official | List of approved software | View Here |
👥 If You Use an Accountant:
- If your accountant or agent (e.g. Perrys) handles your returns using compliant software, no action is required.
- If you previously filed on your own, start exploring alternatives now.