A milk quota is viewed as a non-wasting capital asset, subject to the capital gains tax and capital acquisitions tax codes. If expenditure on the purchase of milk quotas was allowed as a deductible expense for income tax purposes, the logical outcome would be that the proceeds from the sale of a quota should be treated as income and, therefore, liable for income tax. At present, the proceeds are treated as a capital receipt and are subject to capital gains tax which can give much more favourable tax treatment because of indexation relief.
I have no plans to change the taxation rules covering expenditure on milk quota purchase.