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Assignment is the disposal of an existing lease. The assignment of a lease represents a disposal for capital gains purposes of an interest in property. There is no deemed rental income to calculate on the disposal because the assignment is not the grant of a new lease.

The chargeable gain on assignment of a 'long' lease, that is a lease with at least 50 years to run, is computed as a standard capital gains disposal. This is dealt with further below.

Where the lease has less than 50 years to run at the point at which it is assigned then it will be regarded as a wasting asset. This means that only a proportion of the original expenditure will be an allowable deduction against the disposal value. The amount of the original cost of a short-term lease allowable as a deduction on disposal reduces in accordance with a statutory formula given in TCGA 1992, Sch 8 (also known as a curvilinear lease depreciation table) to reflect the fact that the depreciation