An Employer Reference Number (ERN), also known as a PAYE reference or tax reference number, is a unique reference number which HMRC issues to employers when they register for PAYE.

Do I need an Employer Reference Number?

You’ll need to register as an employer for PAYE when you take on staff who are paid more than the PAYE tax threshold, so that you can report their pay and any deductions you make. You won’t need to register if you don’t employ anyone, or if you become an employer but your new employee is paid less than the PAYE threshold.

How much is the PAYE registration threshold?

You’ll need to register for PAYE and get an Employer Reference Number if any director or employee earns over the Lower Earnings Limit for National Insurance at £6,396 per year).

How do I get an Employer Reference Number (ERN)?

HMRC will send you your Employer Reference Number (ERN) when you register as an employer for PAYE, along with your Accounts Office Reference Number.

What is an Accounts Office Reference Number (AORN)?

This 13 digit reference number will be shown as a series of letters and numbers, usually in the following format: 123PA12345678. You’ll need to use this reference when you make PAYE payments to HMRC as an employer.
 

How do I check my Employer Reference Number?

Your ERN will be shown on any letters or emails between you and HMRC which relate to your registration as an employer. You might also see it called a PAYE reference number because it’s used to identify you as an employer when processing payroll.

If you’re an employee then your employer’s PAYE number (or ERN as it might also be shown) might be included on your payslips, a P45, or a P60 from the employer it relates to. You can also ask your employer to provide this information to you.

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