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HMRC internal manual

VAT Default Interest Manual

Calculation of interest: Interest calculation record codes

Code Meaning
A Prime assessment or payment return for the period in which the assessment was raised
B Repayment return for the period in which the officer’s assessment was raised
C Calculation point for interest on the original assessment
D Calculation point for further interest
E Amendment
F Remittance appropriated against interest bearing tax
G HQ interest adjustment start
H HQ interest adjustment end
I Write-off VAT708
J Unpaid cheque
K Change in interest rate
M Transfer out
N Pre 1 April 1990 tax over declared on an officer’s assessment
O Remittance reassignment out
P Remittance reassignment in
Q Return replacing prime plus additional assessment
R Repayments appropriation
S Insolvency reinstatement of write off
W Accounting adjustment for leap year
X Interest inhibit set after appeal
Y Insolvency
Z Deregistration