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HMRC internal manual

Capital Allowances Manual

Assured Tenancy Allowances: The relevant interest

CAA01/S495 and CAA01/S500

The relevant interest in a building is the interest that the person who incurred construction expenditure on the building had when the construction expenditure was incurred.

The rules for when the relevant interest is a leasehold interest that comes to an end are the same as the IBA rules CA33050.

A dwelling house may be a flat or a maisonette contained in a larger building. The relevant interest in a dwelling house that is part of a larger building is the part of the relevant interest in the larger building that subsists in the dwelling house. For example, the relevant interest in a flat contained in a block of flats whose relevant interest is the freehold is the freehold interest in that flat.