This section applies if there is a realisation of an intangible fixed asset in respect of which debits have been brought into account for tax purposes.

If the proceeds of realisation exceed the tax written-down value of the asset, a credit equal to the excess must be brought into account for tax purposes.

If the proceeds of realisation are less than the tax written-down value of the asset, a debit equal to the shortfall must be brought into account for tax purposes.

If there are no proceeds of realisation, a debit equal to the tax written-down value must be brought into account for tax purposes.

References in this section to the tax written-down value of an asset are to its tax written-down value immediately before the realisation.