BKM403100 | Banking surcharge: calculation of surcharge profits: CT surcharge
From HM Revenue & Customs · Banking Manual
The surcharge profits of a company which is a banking company in relation to an accounting period are computed as follows:
Compute taxable total profits under the normal rules at S4(2)
Add any of the following which have been given in determining those taxable profits:
non-banking group relief
relevant transferred out gains
Deduct
non-banking transferred-in gains
research and development expenditure credits