RM5532 | RO instructions: Preparing the claim for repayment
From HM Revenue & Customs · Repayment Claims Manual
When you have calculated the overpayment
follow the instructions at RM2584 onwards
complete an R23 (RM2640)
prepare an explanation of the repayment for the claimant as follows
use a form R37 or R37A-1 if it is suitable. Otherwise prepare a typed computation
keep your explanation clear and simple. Do not use abbreviations
keep a copy
put the computation on top of the claim papers so that it can be sent with the payable order
always send the computation to the agent if there is one