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Companies House iXBRL / UKSEF Account E-Filing

E-filing your company accounts to Companies House is seamless with our platform — whether you're submitting in UKSEF or iXBRL format. We handle formatting, validation, and secure delivery, ensuring full compliance with Companies House protocols.

Why Choose UKSEF?

UKSEF (UK Single Electronic Format) is the next-generation standard for submitting annual accounts to Companies House — and it’s the future of digital filing in the UK.

Especially recommended for: Listed companies, Group structures, Entities producing premium or lengthy annual reports.

Major Advantages of Filing via UKSEF:
  • Supports large file sizes — up to 100MB
  • Retains full visual presentation including colour, layout, branding, charts, & images
  • Your audience sees what you see — the exact report is publicly viewable and downloadable from Companies House
  • Complies with Companies House’s most advanced digital filing route

Whether you have a glossy 500+ page report or just want to maintain your visual identity in public filings — UKSEF makes it possible.

UKSEF is not just a compliance tool — it’s a presentation advantage.

Still Supporting iXBRL

For simpler or smaller filings, iXBRL remains supported and effective. We offer full iXBRL tagging services to convert your financial statements into compliant formats for both HMRC and Companies House.

What You Need to File (Both UKSEF and iXBRL)

Your Accounts (formatted as UKSEF or iXBRL).

Form Header CSV with:

  • Company Number
  • Company Name
  • Company Authentication Code

We provide the templates and walk you through completing these. If you don’t yet have your Companies House Presenter credentials, we’ll help you apply.

Streamlined Validation and Submission

Our system:

  • Validates your Form Header CSV and converts it to XML
  • Checks all schema and business rules (for UKSEF and iXBRL)
  • Flags any issues before submission

Once your files pass, you’ll get a green light to submit. We handle the rest using our secure XML submission gateway to Companies House — and you’ll receive immediate confirmation.

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