Bangladesh Non-Government Teachers' and Employees' Forum also demanded nationalisation of the institutions at a press conference at the Jatiya Press Club.
"Previously, the amount reserved for pension board and welfare trust was six percent of the total salary. But after the newly issued order, it has been increased to 10 percent," said Md Saidul Hasan Selim, president of the forum.
The organisation said the four percent rise was ordered through two separate notices issued by the Madrasah Education Board and the Secondary and Higher Secondary Education Board.
Selim said they had staged countrywide demonstrations and held human chains on February 3 demanding cancellation of the order.
Teachers and employees of non-government schools, colleges and madrasahs submitted memorandums to their respective district commissioners on Tuesday seeking abolition of the order, the forum said.
Selim hoped Prime Minister Sheikh Hasina would nationalise non-government educational institutions and repeal the issued order.
The forum warned of intensified agitation if the demands are not met by May 10.