PAYE50930 | Employer returns: employer starter and leaver forms: employer e-file in-year penalties: ECS penalty reference numbers
From HM Revenue & Customs · PAYE Manual
ECS penalty reference numbers are automatically generated. Each reference number is made up as follows
The office number
EYI (to indicate that the penalty area is in-year online filing)
N (to indicate that the penalty is for failing to file in-year online)
E (for ECS)
The consecutive number. The maximum number of ECS penalty charges for any one office number in any one year of Account is 99,999
The year of Account. This is the accounting year for the annual balance which ends on the last Friday in October each year. For example the year of Account ending in October 2010 will be shown as 10
Employer reference. This excludes the office numeral
Example
073 EYI N E 123 10 E999
In Account 10
The 123rd penalty for office number 073
For the employer record with the employer reference E999