HM Revenue & Customs (HMRC) free Corporation Tax online filing software is a downloadable PDF. Before you can use its full functionality, you must ensure you have Adobe Reader software version 9.2 (or later) installed on your computer and change your security Adobe Reader security settings.
This page contains links to further guidance to help you do this. Before you start, you need to know what version of Adobe Reader you're using. To check this, please open up Adobe Reader, click the 'Help' button on your browser (usually at the top of the page) and select 'About Reader'. This will tell you what version you are using and you can then follow the appropriate link below.
This guidance also includes help to attach your company accounts, computations and other documents to your Company Tax Return, when using HMRC's online filing software.
Changing settings in Adobe Reader version 9.2 and filing attachments (PDF 1.6MB)
Changing settings in Adobe Reader version 10 or later and filing attachments (PDF 1.4MB)
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