You need Adobe Reader version 9.2 or later to use the HMRC software. If you have an older version of Adobe Reader, HMRC recommends that you download the latest version from the Adobe website before you download the HMRC software. The download is free.
When you select the HMRC software for download, a PDF form is sent to your computer. This form is pre-populated with your Unique Taxpayer Reference (UTR) and Companies House Registration Number as well as the dates for the accounting period you have selected. When downloading the software you must choose the 'Save' option rather than 'Open' or 'Run' for the form to work correctly.
For more information follow the link 'How do I change the Trust Settings in the HM Revenue & Customs (HMRC) CT600 online filing software?'
The software has 3 key parts: a CT600 (Short) return form, accounts templates and computations templates. The templates are designed for smaller companies and organisations with straightforward affairs.
More detailed information about who can use the CT600 (Short) return form and the information you can report using the accounts and computations templates can be found on the Who can use HMRC's Corporation Tax online filing software page.
The software also has on-screen help, prompts and guidance so you can check and identify any mistakes as you work through each section.
Once you've completed your Company Tax Return, follow the submission process within the form to log in to the HMRC Corporation Tax online service and submit your completed return.