The Socialist Party, Labour (PvdA) and left-wing greens Groenlinks made a joint call for a higher top rate of tax in Saturday’s Volkskrant newspaper.

The tax increase would be part of an investment plan based on solidarity, intelligence and green values, the three party leaders said in an article, without giving any figures.
The current top rate of tax is 52% on income over € 56,491. A 1% increase would generate an extra €400m a year for the treasury, the Volkskrant said.
The people affected by the increase would get ‘a better Netherlands in return’, the party leaders wrote.
The SP is currently riding high in the opinion polls, while Labour has seen its support almost halve since the June 2010 general election.