An Employee Reference Number (ERN) is a unique number given to every business that registers with HM revenue and Customs as an employer. It’s a unique set of letters and numbers used by the taxman to identify your business and may also be referred to as an employer PAYE reference. Your ERN will include two parts: a three-digit HMRC office number, and a reference number unique to your business.
If you don't know your ERN, simply check the box that says "We're exempt from having an ERN or will provide it within 30 days" and let us know when you have it to hand.
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