The House of Commons will later vote on a Plaid Cymru amendment calling for a review of the top rate of income tax. Plaid Cymru has a longstanding policy to reinstate the 50p top rate of income tax - a position which the Labour party finally agrees with.
When the initial measure was included in the 2012 Budget the House of Commons divided on a resolution following a vote called for by Plaid Cymru and SNP MPs to raise the top level to 50p. The Labour party abstained.
Speaking ahead of the vote, Plaid Cymru Treasury spokesperson Jonathan Edwards MP said that tackling inequality is the biggest political issue of our time and that progressive taxation must play a role in that.
Mr Edwards said:
"Plaid Cymru has a longstanding policy to reinstate the 50p top rate of income tax. It was a cornerstone of our Budget proposals this year and the last.
"Progressive taxation is key to tackling inequality - one of the biggest challenges facing Western economies today. Even the IMF now agrees that reducing inequality is essential if economies are to grow sustainably in future.
"The Labour party has vowed to reintroduce the 50p top rate should they gain power after the 2015 General Election. Hopefully they will seize the opportunity to bring this move forward by voting for our amendment later today.
"The Coalition has shown itself to be utterly out-of-touch by cutting taxes for individuals earning £3,000 a week or more. It was one act that undermined their most successful propaganda line and proved that we aren’t “all in it together.”
“Disturbingly, senior Tory and Lib Dem MPs are making the case for a further cut to 40p which was the chosen top rate during the 13 years of the last Labour UK government.
“We hope this amendment will attract broad support in order to make progress on tackling inequality and reforming our current regressive taxation system in which the poorest pay more of a share of their income in taxes than the richest.”