This section sets out circumstances in which the Treasury must consider whether the tax varying power of the Scottish Parliament ought to be amended. It applies where it appears to the Treasury that proposed changes to the UK income tax structure would affect significantly the practical extent for any year of the Scottish Parliament’s tax-varying powers. The section requires the Treasury at certain times to indicate to the House of Commons whether an amendment to the Scottish Parliament’s tax-varying power is necessary and, if so, to make defined and limited proposals for amending that power.
Commentary Part IV: the Tax Varying Power Purpose and Effect