Knowledge base

What is a VAT Registration Number?

Published 13/06/2025

If you're VAT registered, your VAT registration number is your key to charging VAT, reclaiming it on expenses, and filing VAT returns.

It’s a 9-digit number, often written as 123456789 or 123 4567 89, and you’ll find it on your VAT certificate from HMRC. If you’ve raised invoices or filed VAT returns before joining Mighty, it’ll also be on those documents.

Not sure if you need to register for VAT? Check out our guide on voluntary VAT registration here.

Still have questions? We’re here to help - just drop us an email at support@mightyaccounting.com

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