Around one third of housing corporations have not given an extra rent increase to high-earning tenants because they have not had enough information from the tax office, according to the sector’s umbrella organisation Aedes.

A survey of half of the country’s 400 housing corporations showed around one in five requests for information about which income band a household fell into were not met.

Two weeks ago, housing minister Stef Blok said the tax office did not know the income of around 5% of tenants and most of the problems have been solved.

The three million people living in social housing with a current rent of up to €681 a month face an increase of at least 4% this year. Tenants with an annual income over €33,614 have been given a 4.5% increase and those earning over €43,000, a 6% boost. Rents will rise again by the same percentages next year.

According to the tax office, around 25% of all housing corporation tenants have a household income of more than €33,000. Technically this means they are too well-off to qualify for rent-controlled housing.