iXBRL Online Filing Error 3303: One of the Inline XBRL documents contains malformed xml

Summary

When filing your CT600 and Accounts online in iXBRL format, you may receive the following error within Sage Corporation Tax when you are submitting to the gateway.

Description

The request has not been accepted.

Error type: business
Error number: 3001
The submission of this document has failed due to departmental specific business logic in the Body tag.

Type: Business
Number: 3303
Location: Accounts
One of the Inline XBRL documents contains malformed xml. Please check the attachment and resubmit.

Type: Business
Number: 1605
Location: iXBRL
The attachment with the file name Limited Company iXBRL.html is in an invalid format.

Resolution

Why do I receive this error?

This error appears because of a problem with how the submitted HTML accounts file was created. You can identify it by the Location: Accounts and Location: iXBRL references in the message.

How do I resolve this error?

When you create an HTML file in any accounts software, don't open and resave it from a web browser. This can cause the error.
If you've already done this, regenerate the HTML file and submit it online again.
If the problem continues, contact your accounts software provider.

If you use a Sage product to generate your accounts

If you use Sage Accounts Production, Sage Accounts Production Advanced, or Sage XBRL Tagging, call us on 0191 479 5999 so we can investigate.

If you use another software provider

  • If you use IRIS Accounts Production, contact IRIS to investigate.
  • For any other accounts production package, contact the relevant software provider.

 

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Solution Properties

Solution ID
200427112241419
Last Modified Date
Tue Jul 14 14:51:31 UTC 2026
Views
0