Last updated Sep 17, 2026 and written by Daniel Tuckey

What's the WebFiling Authentication Code?

featured-image

It's a 6-character code, a mix of letters and digits, issued by Companies House. Without it, you can't file anything online for your company, whether through us or directly with Companies House.

Key Takeaways

  • It's a unique 6-character code tied to your specific company, required for any online filing.
  • Companies formed with us are automatically allocated a code, viewable in your account.
  • If you don't have your code, Companies House will post a replacement to your registered office.
  • Since October 2025, requesting a code requires signing in with GOV.UK One Login.

Where Do I Find My Code if You Formed My Company?

Log in, select "My Companies," and click on your company's name. Your code is shown next to "WebFiling Authentication Code."

What if I Don't Have a Code?

If your company wasn't formed with us, or you've misplaced your code, you'll need to request a replacement through Companies House WebFiling, which now requires signing in with GOV.UK One Login. Your code is then posted to your registered office.

For the full picture on finding, replacing, or losing your code, our main guide to your WebFiling authentication code covers it all.

This article is for general information only and does not constitute legal advice. Companies House systems can change, so it's worth checking current guidance on GOV.UK or Companies House before relying on the details above.