The double-Irish will not be available to new companies from January and will be phased out for existing taxpayers between now and 2020 The Irish government announced in its 2015 Budget the abolition of the so-called double-Irish structure and its intention to introduce an income-based system for the taxation of intellectual property, which it is calling a Knowledge Development Box. In a well-flagged move, Michael Noonan, the Irish Minister of Finance, said in his speech that the double-Irish would be not be available to new companies from January 1 next year. A transition period for existing taxpayers will last until the end of 2020. Noonan said the change means that companies incorporated in Ireland would have to be tax resident there too.