The Company Number: With or Without a Zero?

Last updated: Sep 29, 2026 1 minute read Compliance and Legal
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Daniel Tuckey
Written by: Daniel Tuckey

Both are correct. Your Certificate of Incorporation shows your company number without a leading zero, while the Companies House online register sometimes displays it with one. They're the exact same number either way, you're free to write it with or without.

FAQs

Does it matter if I write my company number with or without the leading zero?

No, both refer to the same number, and either is fine to use on your own documents.

Why does my company number look different on different Companies House pages?

Some formats display it with a leading zero, others without. It's simply a display difference, not a different number.

This article is for general information only and does not constitute legal advice.