The strike is the first to hit the federation, which itself regularly organises labour action across various sectors.

Its own employees are now asking for salary raises in line with inflation, currently at around 5.6 percent.

"It is of course extremely disappointing to see that management is sticking to its guns," said FNV personnel representative Judith Westhoek.

"FNV employees are just as entitled to fair collective agreements," she said.

"The fact that we have to campaign and strike for this is just painful," she said, adding that employees hoped for an agreement on May 1, International Workers' Day.

This did not happen, meaning that "action will be taken at the union".

"This starts today with a visibility campaign during the 1 May march in Amsterdam. There will be a nationwide strike tomorrow," FNV employees said in a statement.

FNV management vying for a three-year collective labour agreement that would see wages increase by three to seven percent depending on salary scales.

An automatic price compensation would be introduced with a guaranteed extra five percent increase for everybody on January 1, next year.

Inflation will be monitored for the coming years with compensation to a maximum of five percent, management said.

Employees however said the offer was not enough and warned more strikes were to follow if the deal did not improve.