Step 1 Ensure that you have prepared your Companies House Header spreadsheet documents and have saved them in a CSV file format ready to be uploaded. If you have not done this please go back to download the Companies House Header spreadsheet documents from "Download Spreadsheet".

Note: It is advisable to check your iXBRL document using XBRL Company Accounts Validator before you upload it to our server. The XBRL Company Accounts Validator allows iXBRL to be parsed and validated against the necessary Accounts validation rules. It will also check an iXBRL instance document against the Companies House Taxonomy for errors and omissions.
Click here for the test parser / validator.