Corporation tax online filing
HMRC has recently changed its published corporation tax web guidance:
- The maximum size for combined attachments when using HMRC’s free software is 5MB.
- You can only include one iXBRL statutory accounts file as part of a company’s online tax return.
- If iXBRL accounts are being included as part of the online return, any additional accounts forming part of the return must be attached as PDF files using the category ‘other’. This might apply, for example, where the company wanted to attach consolidated accounts as well as its own.
- The ‘file and manage’ return page explains what to do where a company prepares accounts for more than 12 months. When submitting a return online, you need to file a separate CT600 return form for each accounting period, but you only need to include the company’s accounts – in iXBRL format – with one of the forms.
If you are using HMRC’s online software, the accounting periods will be listed based on information held by HMRC, but you may need to amend them. You do this using the ‘Change Accounting Period’ function which is explained in the guidance. You can then select and download the online return form for each accounting period. However, you only need to complete the accounts template for the first accounting period.