The micro-entity accounts filing process allows the option to produce the accounts in .html form. This is the format needed to attach to your Corporation Tax Return (CT600) when filing with HMRC via commercial tax software.

Note: HMRC's free joint-filing service (CATO) closed on 31 March 2026, so a CT600 can no longer be filed directly through HMRC's own portal. Commercial third-party tax software is now required, and this .html accounts file is what you attach within it.

For more information on the micro-entity accounts process, please see our guide How Do I File Micro-Entity Accounts?

The .html file will be saved in your Document Library which can be accessed at the top of the screen. It will be labelled with the company name and type of document, below is an example.

The process to download the file may differ depending on which browser you are using, please select the appropriate guide below:

Once opened, the document will appear as detailed in the screenshot below.

Note: It is not possible to upload .html files to the document library, only those which are produced by the software can be stored on Inform Direct.