Before submitting CT600s please check the following:
- Both iXBRL Accounts and iXBRL Computation file must be attached just before submission. (note : attachments are not currently saved with the CT600 when ‘Save’ is clicked).
- Use Ftax iXBRL Computations, although VT Software Computations should also work.
- Never Open and then Save iXBRL files in anything other than a text editor, as this may add extraneous data. Be very careful not to open an iXBRL file into a browser and click Save, as this will corrupt the iXBRL data.
- Each iXBRL attachment filename must end in ‘.html’. Re-edit if the file ends in ‘ .htm ‘ .
- Attachment filenames must NOT include any spaces, underscores, or dashes.
- The iXBRL Account and Computation files must have DIFFERENT filenames.
- The Company Number in the iXBRL Accounts file must be the same as that in the CT600, and feature 8 digits. You may have to add leading digits to this value when compiling the iXBRL Accounts file. Failure to do so will result in Error code 1606 being returned.
- Make sure you are using the LATEST Ftax forms. If Error Code 3303 has been returned then you need to download the latest version and transfer data using Export and Import. Regenerate and attach the iXBRL Computations.
- Read the ” After submitting I receive an error message.” FAQ to identify the solution to other common problems.
- If the profit is zero (box 3), make sure the worksheet has been open and closed, and the ‘Calculate Tax’ button has been clicked. This will propagate the necessary ‘0.00’ values throughout the form.
Compliance with the above will resolve most iXBRL tax filing issues. But if you are still experiencing problems please email your form to support@ftax.co.uk along with the iXBRL Computations and iXBRL Accounts files, and the error message.