CG46130 | Groups: restriction of indexation allowance: debts on a security
From HM Revenue & Customs · Capital Gains Manual
No indexation allowance is due to the lending company on the disposal of a debt on a security if the lending and borrowing companies were
linked when the debt was acquired, and
linked when the debt was disposed of (including disposal by way of repayment of the loan).
If the companies
were not linked when the debt was acquired
subsequently became linked, and
were linked when the debt was disposed of
the indexation allowance on the disposal is restricted to the allowance due for the period ending on the date the companies became linked. Detailed instructions are at CG46150+.