http://www.legislation.gov.uk/ukpga/2005/5/section/511/enactedIncome Tax (Trading and Other Income) Act 2005IncomeKing's Printer of Acts of Parliament2021-08-04 Part 4Savings and investment incomeChapter 9Gains from contracts for life insurance etc.Transaction-related calculations and part surrender or assignment eventsMethod for making transaction-related calculations under section 510 511 1 This section deals with the calculation required to be made under section 510 to determine— a whether a relevant transaction which has occurred during an insurance year resulted in a gain arising on the policy or contract, and b if so, the amount of the gain. 2 There is a gain if the transaction value for the relevant transaction (see subsection (4)) exceeds the amount of available premium left for the relevant transaction as calculated in accordance with section 512. 3 The gain is equal to the excess. 4 The transaction value for the relevant transaction is the value in accordance with section 508, as at the time of its surrender or assignment, of the part of or share in the rights under the policy or contract which has been surrendered or assigned in the transaction. 5 Subsections (2) and (4) are subject to section 513(4) (under which the transaction value is to be reduced in certain cases where the relevant transaction occurs in the final insurance year).