Welcoming the Silk Commission's report, Shadow Welsh Secretary Owen Smith said:
In assessing those recommendations, we will need to test not only whether the proposals are in the financial interest of the Welsh people but also whether they pass the test of enabling an equitable and sustainable financial settlement for the whole of the UK.
And where those changes represent a significant departure from the current devolution settlement, for example on income tax powers, the Commission is right to conclude that such changes ought to be subject to a referendum.
The Silk Commission recommends that the Welsh Government should be able to vary income tax rates here in Wales.
The Silk Commission's first report is published today. It's expected to recommend the Welsh Government should have control of some taxes.