Last updated Jul 28, 2026 and written by Daniel Tuckey

Where's My Companies House WebFiling Authentication Code?

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If we formed your company, your code is already saved in your online account. If you formed directly with Companies House, or you've misplaced it, you'll need to request a replacement, and it'll arrive by post.

Key Takeaways

  • If you formed your company with us, log in and check "My Companies" first, no need to request anything.
  • If Companies House needs to send you a code, it only ever arrives by post, never by email or phone.
  • Since October 2025, requesting a code requires a GOV.UK One Login account.
  • Losing your code doesn't put your company at risk. It just pauses your ability to file until the replacement arrives.

Check Your Account First

Log in to your Companies MadeSimple account, select "My Companies," click your company's name, and check the "Company Details" section. If it's there, you're done, no need to go any further.

If It's Not There, Here's the Short Version

If your code isn't saved anywhere, sign in to GOV.UK One Login, go to Companies House WebFiling, and select "Request an authentication code." Confirm your company details and a new code will be posted to your registered office within a couple of weeks.

For the full breakdown, including the difference between your authentication code and your personal identity verification code, what changed with accounts filing, and who you should never share your code with, our complete guide to your WebFiling authentication code covers everything in one place.

FAQs

Where do I find my authentication code if you formed my company?

Log in to your account, select "My Companies," click your company's name, and check "Company Details."

What if my code isn't in my account?

Request a replacement through Companies House WebFiling using GOV.UK One Login. It'll be posted to your registered office.

Can I get my code by email instead of post?

No. Companies House only sends it by post, never by email or phone, for security reasons.

This article is for general information only and does not constitute legal advice. For full details, see our complete guide to your WebFiling authentication code.