Commentary on Sections Glossary Structure of this Part Section 509: Calculation of allowance after sale of relevant interest
1805.This section is based on part of section 85(3) of CAA 1990. It gives a formula to work out the new rate at which writing-down allowances are available following a sale of the relevant interest on which a balancing adjustment falls to be made.
1806.Subsection (2) refers to the 25-year period beginning with the day on which the “dwelling-house” was first used in the definition of “B”. But section 85(3) of CAA 1990 refers to the period beginning with the date on which the “building” was first used. Section 85(3) is not consistent with section 87(2) of CAA 1990 which limits the period during which balancing adjustments can be made by reference to first use of the dwelling-house. This section is rewritten on the basis that a mistake was made in section 85(3)’s reference to first use of the building. See Note 66 in Annex 2.