CH81071 | Penalties for inaccuracies: in what circumstances is a penalty payable: what is a repayment of tax
From HM Revenue & Customs · Compliance Handbook
You must check the date from which these rules apply for the tax or duty you are dealing with. See CH81011 for full details.
The phrase ‘repayment of tax’, see CH81070, includes items which otherwise may not be regarded as a repayment of tax. It specifically includes
allowing a credit against tax or duty, or
a payment of a corporation tax credit.
A corporation tax credit is a
R & D tax credit under FA2000/SCH20
R & D expenditure credit under CTA2009/PART3/Chapter6A
land remediation tax credit under FA2001/SCH22
life assurance company tax credit under FA2001/SCH22
tax credit under FA2002/SCH13 - vaccine research, etc
film tax credit under FA2006/SCH5
first-year tax credit under CAA2001/SCHA1.
FA07/SCH24/PARA28 (f) & (fa)