Electronic Tax Return Options

To access this screen select Reports, Electronic Tax Return.

Period details

Select the Corporation Tax accounting period to which the return relates.

Electronic return status

Select Live or Test. Where test is selected this will be indicated on the Transmit Internet Return screen.

New / amended return indicator

The default setting will be new. In order to submit an amended CT600, change the radio button to the correct field.

Attaching Accounts

Accounts must be attached unless the user has indicated otherwise and given a reason on the Data Entry - Summary screen.  

Due to changes in legislation the program will expect iXBRL Accounts and iXBRL computations to be attached when generating an electronic tax return. If the accounts need to be attached in PDF format, you must tick the option "Accounts attached in PDF format" in the 'Data Entry - Summary' screen to indicate that the accounts need to be attached in PDF format.

A PDF copy of the accounts can be submitted with the return instead of iXBRL accounts in any of the following circumstances;

  1. The return is filed before 01/04/2011.    

  2. The return is for a corporation tax accounting period ending before 01/04/2010.    

  3. The return for a corporation tax accounting period ending on or after 01/04/2010, but is filed before 01/04/2011.    

  4. The company is exempt from iXBRL filing.

Use one of the following radio options to locate the accounts:

  1. Please note that for CT600 returns submitted on or after the 01/04/2011 for accounting periods ending on or after the 01/04/2010, the accounts must be filed online in iXBRL format.

Attach Computation

iXBRL or PDF computations should be attached to the CT600 unless the user has indicated otherwise and given a reason on the Data Entry - Summary screen. There are four options available:

Please note that when attaching an iXBRL tax computations for a long Corporation Tax Account Period (CTAP), due to cross checking of the iXBRL document the CT600 the accounting period that the computation relates to must match that shown on the CT600.

In the situation where there is a long CTAP IRIS Business Tax assumes that the computation will be attached to the 1st CTAP submitted. When dealing with a long CTAP there are several options available to attach the computation:

  1. Please note that for CT600 returns submitted on or after the 01/04/2011 for accounting periods ending on or after the 01/04/2010, the computation must be filed online in iXBRL format.

Optional Attachment

A number of optional attachments can be submitted with the return. Select External PDF to locate an existing PDF for the client or Communication Tracking to attach PDF's which have previously been saved within the communications tracking section.

Please note that where the period of account is longer than 12 months the HMRC will require a company tax return, including a CT600 for each accounting period. No accounting period for tax purposes can exceed 12 months. The first CT600 submitted should have the accounts and computations attached. For any subsequent CT600 covering part of that same period of account the field on page 1 ‘if no accounts say why not’ should be completed with: ‘See CT600 for the period DD/MM/YYYY’.