HMRC RTI
The information must be complete, when HMRC RTI Payments are created; in order to comply with the HMRC Direction concerning Bacs payments.
The HMRC information will be accepted only if it is in the format prescribed, as set out below:

(a) the "/" followed by

(b) a random 3 character string formed from the following characters –
(i) upper case A-Z,
(ii) 0-9,
(iii) full stop,
(iv) hyphen, and
(v) "/"
Note 1
The reference entered must be the same as the reference provided to HMRC in the return required under Reg. 67B of the 2012 Regulations .

Note 2
The Income Tax (Pay As You Earn) (Amendment) Regulations 2012 provide, inter alia, that a Real Time Information employer (as defined in the Regulations) who uses a specified electronic payment method to make a relevant payment under the Regulations must notify the service provider (the bank) that it is a relevant payment and provide the service provider with the related reference.

HMRC has issued a Direction notifying Real Time Information employers that payments using Bacs are specified electronic payments.

A relevant payment under the Regulations is a payment of, or on account of, net PAYE income. There are certain exceptions which are set out in the Regulations.

More information is available on the HMRC website www.hmrc.gov.uk/payerti/getting-started/index.htm